diff mbox series

[FFmpeg-devel,v5,04/12] fftools/ffmpeg: Replace sub2video with subtitle frame filtering

Message ID MN2PR04MB59813A03998F6B868FB5A403BAD89@MN2PR04MB5981.namprd04.prod.outlook.com
State New
Headers show
Series [FFmpeg-devel,v5,01/12] avutil/frame: Subtitle Filtering - Add AVMediaType property to AVFrame
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andriy/make_x86 success Make finished
andriy/make_fate_x86 fail Make fate failed

Commit Message

Soft Works Sept. 12, 2021, 3:21 a.m. UTC
Signed-off-by: softworkz <softworkz@hotmail.com>
---
 fftools/ffmpeg.c                          | 435 +++++++++-------------
 fftools/ffmpeg.h                          |  14 +-
 fftools/ffmpeg_filter.c                   | 198 +++++++---
 fftools/ffmpeg_hw.c                       |   2 +-
 fftools/ffmpeg_opt.c                      |   3 +-
 tests/ref/fate/filter-overlay-dvdsub-2397 | 181 +++++----
 tests/ref/fate/sub-dvb                    | 162 ++++----
 tests/ref/fate/sub2video                  | 178 ++++-----
 tests/ref/fate/sub2video_basic            |  93 +++--
 tests/ref/fate/sub2video_time_limited     |   6 +-
 10 files changed, 623 insertions(+), 649 deletions(-)
diff mbox series

Patch

diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index a9bb9d964d..c828388b34 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -169,163 +169,6 @@  static int restore_tty;
 static void free_input_threads(void);
 #endif
 
-/* sub2video hack:
-   Convert subtitles to video with alpha to insert them in filter graphs.
-   This is a temporary solution until libavfilter gets real subtitles support.
- */
-
-static int sub2video_get_blank_frame(InputStream *ist)
-{
-    int ret;
-    AVFrame *frame = ist->sub2video.frame;
-
-    av_frame_unref(frame);
-    ist->sub2video.frame->width  = ist->dec_ctx->width  ? ist->dec_ctx->width  : ist->sub2video.w;
-    ist->sub2video.frame->height = ist->dec_ctx->height ? ist->dec_ctx->height : ist->sub2video.h;
-    ist->sub2video.frame->format = AV_PIX_FMT_RGB32;
-    if ((ret = av_frame_get_buffer(frame, 0)) < 0)
-        return ret;
-    memset(frame->data[0], 0, frame->height * frame->linesize[0]);
-    return 0;
-}
-
-static void sub2video_copy_rect(uint8_t *dst, int dst_linesize, int w, int h,
-                                AVSubtitleRect *r)
-{
-    uint32_t *pal, *dst2;
-    uint8_t *src, *src2;
-    int x, y;
-
-    if (r->type != SUBTITLE_BITMAP) {
-        av_log(NULL, AV_LOG_WARNING, "sub2video: non-bitmap subtitle\n");
-        return;
-    }
-    if (r->x < 0 || r->x + r->w > w || r->y < 0 || r->y + r->h > h) {
-        av_log(NULL, AV_LOG_WARNING, "sub2video: rectangle (%d %d %d %d) overflowing %d %d\n",
-            r->x, r->y, r->w, r->h, w, h
-        );
-        return;
-    }
-
-    dst += r->y * dst_linesize + r->x * 4;
-    src = r->data[0];
-    pal = (uint32_t *)r->data[1];
-    for (y = 0; y < r->h; y++) {
-        dst2 = (uint32_t *)dst;
-        src2 = src;
-        for (x = 0; x < r->w; x++)
-            *(dst2++) = pal[*(src2++)];
-        dst += dst_linesize;
-        src += r->linesize[0];
-    }
-}
-
-static void sub2video_push_ref(InputStream *ist, int64_t pts)
-{
-    AVFrame *frame = ist->sub2video.frame;
-    int i;
-    int ret;
-
-    av_assert1(frame->data[0]);
-    ist->sub2video.last_pts = frame->pts = pts;
-    for (i = 0; i < ist->nb_filters; i++) {
-        ret = av_buffersrc_add_frame_flags(ist->filters[i]->filter, frame,
-                                           AV_BUFFERSRC_FLAG_KEEP_REF |
-                                           AV_BUFFERSRC_FLAG_PUSH);
-        if (ret != AVERROR_EOF && ret < 0)
-            av_log(NULL, AV_LOG_WARNING, "Error while add the frame to buffer source(%s).\n",
-                   av_err2str(ret));
-    }
-}
-
-void sub2video_update(InputStream *ist, int64_t heartbeat_pts, AVSubtitle *sub)
-{
-    AVFrame *frame = ist->sub2video.frame;
-    int8_t *dst;
-    int     dst_linesize;
-    int num_rects, i;
-    int64_t pts, end_pts;
-
-    if (!frame)
-        return;
-    if (sub) {
-        pts       = av_rescale_q(sub->pts + sub->start_display_time * 1000LL,
-                                 AV_TIME_BASE_Q, ist->st->time_base);
-        end_pts   = av_rescale_q(sub->pts + sub->end_display_time   * 1000LL,
-                                 AV_TIME_BASE_Q, ist->st->time_base);
-        num_rects = sub->num_rects;
-    } else {
-        /* If we are initializing the system, utilize current heartbeat
-           PTS as the start time, and show until the following subpicture
-           is received. Otherwise, utilize the previous subpicture's end time
-           as the fall-back value. */
-        pts       = ist->sub2video.initialize ?
-                    heartbeat_pts : ist->sub2video.end_pts;
-        end_pts   = INT64_MAX;
-        num_rects = 0;
-    }
-    if (sub2video_get_blank_frame(ist) < 0) {
-        av_log(ist->dec_ctx, AV_LOG_ERROR,
-               "Impossible to get a blank canvas.\n");
-        return;
-    }
-    dst          = frame->data    [0];
-    dst_linesize = frame->linesize[0];
-    for (i = 0; i < num_rects; i++)
-        sub2video_copy_rect(dst, dst_linesize, frame->width, frame->height, sub->rects[i]);
-    sub2video_push_ref(ist, pts);
-    ist->sub2video.end_pts = end_pts;
-    ist->sub2video.initialize = 0;
-}
-
-static void sub2video_heartbeat(InputStream *ist, int64_t pts)
-{
-    InputFile *infile = input_files[ist->file_index];
-    int i, j, nb_reqs;
-    int64_t pts2;
-
-    /* When a frame is read from a file, examine all sub2video streams in
-       the same file and send the sub2video frame again. Otherwise, decoded
-       video frames could be accumulating in the filter graph while a filter
-       (possibly overlay) is desperately waiting for a subtitle frame. */
-    for (i = 0; i < infile->nb_streams; i++) {
-        InputStream *ist2 = input_streams[infile->ist_index + i];
-        if (!ist2->sub2video.frame)
-            continue;
-        /* subtitles seem to be usually muxed ahead of other streams;
-           if not, subtracting a larger time here is necessary */
-        pts2 = av_rescale_q(pts, ist->st->time_base, ist2->st->time_base) - 1;
-        /* do not send the heartbeat frame if the subtitle is already ahead */
-        if (pts2 <= ist2->sub2video.last_pts)
-            continue;
-        if (pts2 >= ist2->sub2video.end_pts || ist2->sub2video.initialize)
-            /* if we have hit the end of the current displayed subpicture,
-               or if we need to initialize the system, update the
-               overlayed subpicture and its start/end times */
-            sub2video_update(ist2, pts2 + 1, NULL);
-        for (j = 0, nb_reqs = 0; j < ist2->nb_filters; j++)
-            nb_reqs += av_buffersrc_get_nb_failed_requests(ist2->filters[j]->filter);
-        if (nb_reqs)
-            sub2video_push_ref(ist2, pts2);
-    }
-}
-
-static void sub2video_flush(InputStream *ist)
-{
-    int i;
-    int ret;
-
-    if (ist->sub2video.end_pts < INT64_MAX)
-        sub2video_update(ist, INT64_MAX, NULL);
-    for (i = 0; i < ist->nb_filters; i++) {
-        ret = av_buffersrc_add_frame(ist->filters[i]->filter, NULL);
-        if (ret != AVERROR_EOF && ret < 0)
-            av_log(NULL, AV_LOG_WARNING, "Flush the frame error.\n");
-    }
-}
-
-/* end of sub2video hack */
-
 static void term_exit_sigsafe(void)
 {
 #if HAVE_TERMIOS_H
@@ -526,7 +369,6 @@  static void ffmpeg_cleanup(int ret)
         avfilter_graph_free(&fg->graph);
         for (j = 0; j < fg->nb_inputs; j++) {
             InputFilter *ifilter = fg->inputs[j];
-            struct InputStream *ist = ifilter->ist;
 
             while (av_fifo_size(ifilter->frame_queue)) {
                 AVFrame *frame;
@@ -535,15 +377,6 @@  static void ffmpeg_cleanup(int ret)
                 av_frame_free(&frame);
             }
             av_fifo_freep(&ifilter->frame_queue);
-            if (ist->sub2video.sub_queue) {
-                while (av_fifo_size(ist->sub2video.sub_queue)) {
-                    AVSubtitle sub;
-                    av_fifo_generic_read(ist->sub2video.sub_queue,
-                                         &sub, sizeof(sub), NULL);
-                    avsubtitle_free(&sub);
-                }
-                av_fifo_freep(&ist->sub2video.sub_queue);
-            }
             av_buffer_unref(&ifilter->hw_frames_ctx);
             av_freep(&ifilter->name);
             av_freep(&fg->inputs[j]);
@@ -635,12 +468,14 @@  static void ffmpeg_cleanup(int ret)
         av_frame_free(&ist->filter_frame);
         av_packet_free(&ist->pkt);
         av_dict_free(&ist->decoder_opts);
-        avsubtitle_free(&ist->prev_sub.subtitle);
-        av_frame_free(&ist->sub2video.frame);
+        av_frame_free(&ist->prev_sub.subtitle);
         av_freep(&ist->filters);
         av_freep(&ist->hwaccel_device);
         av_freep(&ist->dts_buffer);
 
+        av_frame_free(&ist->subtitle_heartbeat.recent_sub);
+        av_freep(&ist->subtitle_heartbeat.header);
+
         avcodec_free_context(&ist->dec_ctx);
 
         av_freep(&input_streams[i]);
@@ -1062,7 +897,7 @@  error:
 
 static void do_subtitle_out(OutputFile *of,
                             OutputStream *ost,
-                            AVSubtitle *sub)
+                            AVFrame *frame)
 {
     int subtitle_out_max_size = 1024 * 1024;
     int subtitle_out_size, nb, i;
@@ -1070,7 +905,12 @@  static void do_subtitle_out(OutputFile *of,
     AVPacket *pkt = ost->pkt;
     int64_t pts;
 
-    if (sub->pts == AV_NOPTS_VALUE) {
+    if (!frame)
+        return;
+
+    av_log(NULL, AV_LOG_TRACE, "do_subtitle_out: sub->pts: %"PRId64"  frame->pts: %"PRId64"\n", frame->subtitle_pts, frame->pts);
+
+    if (frame->subtitle_pts == AV_NOPTS_VALUE) {
         av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
         if (exit_on_error)
             exit_program(1);
@@ -1096,30 +936,29 @@  static void do_subtitle_out(OutputFile *of,
         nb = 1;
 
     /* shift timestamp to honor -ss and make check_recording_time() work with -t */
-    pts = sub->pts;
+    pts = frame->subtitle_pts;
     if (output_files[ost->file_index]->start_time != AV_NOPTS_VALUE)
         pts -= output_files[ost->file_index]->start_time;
     for (i = 0; i < nb; i++) {
-        unsigned save_num_rects = sub->num_rects;
+        unsigned save_num_rects = frame->num_subtitle_rects;
 
         ost->sync_opts = av_rescale_q(pts, AV_TIME_BASE_Q, enc->time_base);
         if (!check_recording_time(ost))
             return;
 
-        sub->pts = pts;
-        // start_display_time is required to be 0
-        sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
-        sub->end_display_time  -= sub->start_display_time;
-        sub->start_display_time = 0;
+        frame->subtitle_pts = pts;
+        // subtitle_start_time is required to be 0
+        frame->subtitle_pts               += av_rescale_q(frame->subtitle_start_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
+        frame->subtitle_end_time  -= frame->subtitle_start_time;
+        frame->subtitle_start_time = 0;
         if (i == 1)
-            sub->num_rects = 0;
+            frame->num_subtitle_rects = 0;
 
         ost->frames_encoded++;
 
-        subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
-                                                    subtitle_out_max_size, sub);
+        subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out, subtitle_out_max_size, frame);
         if (i == 1)
-            sub->num_rects = save_num_rects;
+            frame->num_subtitle_rects = save_num_rects;
         if (subtitle_out_size < 0) {
             av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
             exit_program(1);
@@ -1128,15 +967,15 @@  static void do_subtitle_out(OutputFile *of,
         av_packet_unref(pkt);
         pkt->data = subtitle_out;
         pkt->size = subtitle_out_size;
-        pkt->pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->mux_timebase);
-        pkt->duration = av_rescale_q(sub->end_display_time, (AVRational){ 1, 1000 }, ost->mux_timebase);
+        pkt->pts  = av_rescale_q(frame->subtitle_pts, AV_TIME_BASE_Q, ost->mux_timebase);
+        pkt->duration = av_rescale_q(frame->subtitle_end_time, (AVRational){ 1, 1000 }, ost->mux_timebase);
         if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
             /* XXX: the pts correction is handled here. Maybe handling
                it in the codec would be better */
             if (i == 0)
-                pkt->pts += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, ost->mux_timebase);
+                pkt->pts += av_rescale_q(frame->subtitle_start_time, (AVRational){ 1, 1000 }, ost->mux_timebase);
             else
-                pkt->pts += av_rescale_q(sub->end_display_time, (AVRational){ 1, 1000 }, ost->mux_timebase);
+                pkt->pts += av_rescale_q(frame->subtitle_end_time, (AVRational){ 1, 1000 }, ost->mux_timebase);
         }
         pkt->dts = pkt->pts;
         output_packet(of, pkt, ost, 0);
@@ -1577,8 +1416,11 @@  static int reap_filters(int flush)
                 }
                 do_audio_out(of, ost, filtered_frame);
                 break;
+            case AVMEDIA_TYPE_SUBTITLE:
+
+                do_subtitle_out(of, ost, filtered_frame);
+                break;
             default:
-                // TODO support subtitle filters
                 av_assert0(0);
             }
 
@@ -2174,7 +2016,8 @@  static int ifilter_has_all_input_formats(FilterGraph *fg)
     int i;
     for (i = 0; i < fg->nb_inputs; i++) {
         if (fg->inputs[i]->format < 0 && (fg->inputs[i]->type == AVMEDIA_TYPE_AUDIO ||
-                                          fg->inputs[i]->type == AVMEDIA_TYPE_VIDEO))
+                                          fg->inputs[i]->type == AVMEDIA_TYPE_VIDEO ||
+                                          fg->inputs[i]->type == AVMEDIA_TYPE_SUBTITLE))
             return 0;
     }
     return 1;
@@ -2271,7 +2114,7 @@  static int ifilter_send_eof(InputFilter *ifilter, int64_t pts)
         // the filtergraph was never configured
         if (ifilter->format < 0)
             ifilter_parameters_from_codecpar(ifilter, ifilter->ist->st->codecpar);
-        if (ifilter->format < 0 && (ifilter->type == AVMEDIA_TYPE_AUDIO || ifilter->type == AVMEDIA_TYPE_VIDEO)) {
+        if (ifilter->format < 0 && (ifilter->type == AVMEDIA_TYPE_AUDIO || ifilter->type == AVMEDIA_TYPE_VIDEO || ifilter->type == AVMEDIA_TYPE_SUBTITLE)) {
             av_log(NULL, AV_LOG_ERROR, "Cannot determine format of input stream %d:%d after EOF\n", ifilter->ist->file_index, ifilter->ist->st->index);
             return AVERROR_INVALIDDATA;
         }
@@ -2526,83 +2369,177 @@  fail:
     return err < 0 ? err : ret;
 }
 
-static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output,
+static void subtitle_resend_current(InputStream *ist, int64_t heartbeat_pts)
+{
+    AVFrame *frame;
+    int64_t pts, end_pts;
+
+    if (ist->subtitle_heartbeat.recent_sub) {
+        frame = av_frame_clone(ist->subtitle_heartbeat.recent_sub);
+
+        pts     = av_rescale_q(frame->subtitle_pts + frame->subtitle_start_time * 1000LL, AV_TIME_BASE_Q, ist->st->time_base);
+        end_pts = av_rescale_q(frame->subtitle_pts + frame->subtitle_end_time   * 1000LL, AV_TIME_BASE_Q, ist->st->time_base);
+    }
+    else {
+        frame = av_frame_alloc();
+        if (!frame) {
+            av_log(ist->dec_ctx, AV_LOG_ERROR, "Unable to alloc frame (out of memory).\n");
+            return;
+        }
+
+        frame->type = AVMEDIA_TYPE_SUBTITLE;
+        frame->format = av_get_subtitle_format_from_codecdesc(ist->dec_ctx->codec_descriptor);
+
+        frame->width = ist->subtitle_heartbeat.w;
+        frame->height = ist->subtitle_heartbeat.h;
+
+
+        pts       = ist->subtitle_heartbeat.end_pts <= 0 ? heartbeat_pts : ist->subtitle_heartbeat.end_pts;
+        end_pts   = INT64_MAX;
+
+        frame->subtitle_pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q);
+        frame->subtitle_end_time = 1000;
+    }
+
+    frame->pts = pts;
+    ist->subtitle_heartbeat.last_pts = pts;
+    ist->subtitle_heartbeat.end_pts = end_pts;
+
+    send_frame_to_filters(ist, frame);
+}
+
+static void subtitle_heartbeat(InputStream *ist, int64_t pts)
+{
+    const InputFile *infile = input_files[ist->file_index];
+    int i;
+    int64_t pts2;
+
+    /* When a frame is read from a file, examine all subtitle streams in
+       the same file and send the subtitle frame again. Otherwise, decoded
+       video frames could be accumulating in the filter graph while a filter
+       (possibly overlay) is desperately waiting for a subtitle frame. */
+    for (i = 0; i < infile->nb_streams; i++) {
+        InputStream *ist2 = input_streams[infile->ist_index + i];
+        if (!ist2->subtitle_heartbeat.is_active)
+            continue;
+        /* subtitles seem to be usually muxed ahead of other streams;
+           if not, subtracting a larger time here is necessary */
+        pts2 = av_rescale_q(pts, ist->st->time_base, ist2->st->time_base) - 1;
+        /* do not send the heartbeat frame if the subtitle is already ahead */
+        if (pts2 <= ist2->subtitle_heartbeat.last_pts)
+            continue;
+        if (pts2 >= ist2->subtitle_heartbeat.end_pts) {
+            /* if we have hit the end of the current displayed subpicture,
+               or if we need to initialize the system, update the
+               overlayed subpicture and its start/end times */
+            if (ist2->subtitle_heartbeat.recent_sub)
+                av_frame_free(&ist2->subtitle_heartbeat.recent_sub);
+            subtitle_resend_current(ist2, pts2 + 1);
+        }
+        //for (j = 0, nb_reqs = 0; j < ist2->nb_filters; j++)
+        //    nb_reqs += av_buffersrc_get_nb_failed_requests(ist2->filters[j]->filter);
+        //if (nb_reqs)
+        //    subtitle_heartbeat_resend_current(ist2, pts2);
+    }
+}
+
+static int decode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output,
                                int *decode_failed)
 {
-    AVSubtitle subtitle;
-    int free_sub = 1;
-    int i, ret = avcodec_decode_subtitle2(ist->dec_ctx,
-                                          &subtitle, got_output, pkt);
+    AVFrame *decoded_frame;
+    AVCodecContext *avctx = ist->dec_ctx;
+    int i = 0, ret = 0, err = 0;
+    int64_t pts, end_pts;
+
+    if (!ist->decoded_frame && !(ist->decoded_frame = av_frame_alloc()))
+        return AVERROR(ENOMEM);
+    if (!ist->filter_frame && !(ist->filter_frame = av_frame_alloc()))
+        return AVERROR(ENOMEM);
+
+    decoded_frame = ist->decoded_frame;
+    decoded_frame->type = AVMEDIA_TYPE_SUBTITLE;
+
+    if (!ist->subtitle_heartbeat.header && avctx->subtitle_header)
+        ist->subtitle_heartbeat.header = av_strdup((char *)avctx->subtitle_header);
 
-    check_decode_result(NULL, got_output, ret);
+    ret = avcodec_decode_subtitle2(avctx, decoded_frame, got_output, pkt);
+    decoded_frame->subtitle_header = ist->subtitle_heartbeat.header;
+
+    if (ret != AVERROR_EOF)
+        check_decode_result(NULL, got_output, ret);
 
     if (ret < 0 || !*got_output) {
         *decode_failed = 1;
-        if (!pkt->size)
-            sub2video_flush(ist);
+        if (!pkt->size) {
+            // Flush
+            for (i = 0; i < ist->nb_filters; i++) {
+                ret = av_buffersrc_add_frame(ist->filters[i]->filter, NULL);
+                if (ret != AVERROR_EOF && ret < 0)
+                    av_log(NULL, AV_LOG_WARNING, "Flush the frame error.\n");
+            }
+        }
         return ret;
     }
 
     if (ist->fix_sub_duration) {
         int end = 1;
-        if (ist->prev_sub.got_output) {
-            end = av_rescale(subtitle.pts - ist->prev_sub.subtitle.pts,
+        if (ist->prev_sub.got_output && ist->prev_sub.subtitle) {
+            end = av_rescale(decoded_frame->subtitle_pts - ist->prev_sub.subtitle->subtitle_pts,
                              1000, AV_TIME_BASE);
-            if (end < ist->prev_sub.subtitle.end_display_time) {
-                av_log(ist->dec_ctx, AV_LOG_DEBUG,
+            if (end < ist->prev_sub.subtitle->subtitle_end_time) {
+                av_log(avctx, AV_LOG_DEBUG,
                        "Subtitle duration reduced from %"PRId32" to %d%s\n",
-                       ist->prev_sub.subtitle.end_display_time, end,
+                       ist->prev_sub.subtitle->subtitle_end_time, end,
                        end <= 0 ? ", dropping it" : "");
-                ist->prev_sub.subtitle.end_display_time = end;
+                ist->prev_sub.subtitle->subtitle_end_time = end;
             }
         }
         FFSWAP(int,        *got_output, ist->prev_sub.got_output);
         FFSWAP(int,        ret,         ist->prev_sub.ret);
-        FFSWAP(AVSubtitle, subtitle,    ist->prev_sub.subtitle);
+        FFSWAP(AVFrame*,   decoded_frame, ist->prev_sub.subtitle);
         if (end <= 0)
-            goto out;
+            return end;
     }
 
     if (!*got_output)
         return ret;
 
-    if (ist->sub2video.frame) {
-        sub2video_update(ist, INT64_MIN, &subtitle);
-    } else if (ist->nb_filters) {
-        if (!ist->sub2video.sub_queue)
-            ist->sub2video.sub_queue = av_fifo_alloc(8 * sizeof(AVSubtitle));
-        if (!ist->sub2video.sub_queue)
-            exit_program(1);
-        if (!av_fifo_space(ist->sub2video.sub_queue)) {
-            ret = av_fifo_realloc2(ist->sub2video.sub_queue, 2 * av_fifo_size(ist->sub2video.sub_queue));
-            if (ret < 0)
-                exit_program(1);
-        }
-        av_fifo_generic_write(ist->sub2video.sub_queue, &subtitle, sizeof(subtitle), NULL);
-        free_sub = 0;
-    }
+    decoded_frame->format = av_get_subtitle_format_from_codecdesc(avctx->codec_descriptor);
+    decoded_frame->type = AVMEDIA_TYPE_SUBTITLE;
 
-    if (!subtitle.num_rects)
-        goto out;
+    if ((ret = av_frame_get_buffer2(decoded_frame, 0)) < 0)
+        return ret;
 
-    ist->frames_decoded++;
+    pts     = av_rescale_q(decoded_frame->subtitle_pts + decoded_frame->subtitle_start_time * 1000LL,
+                           AV_TIME_BASE_Q, ist->st->time_base);
+    end_pts = av_rescale_q(decoded_frame->subtitle_pts + decoded_frame->subtitle_end_time   * 1000LL,
+                             AV_TIME_BASE_Q, ist->st->time_base);
 
-    for (i = 0; i < nb_output_streams; i++) {
-        OutputStream *ost = output_streams[i];
+    ist->subtitle_heartbeat.last_pts = decoded_frame->pts = pts;
+    ist->subtitle_heartbeat.end_pts = end_pts;
 
-        if (!ost->pkt && !(ost->pkt = av_packet_alloc()))
-            exit_program(1);
-        if (!check_output_constraints(ist, ost) || !ost->encoding_needed
-            || ost->enc->type != AVMEDIA_TYPE_SUBTITLE)
-            continue;
+    if (ist->nb_filters == 0) {
+        for (i = 0; i < nb_output_streams; i++) {
+            OutputStream *ost = output_streams[i];
 
-        do_subtitle_out(output_files[ost->file_index], ost, &subtitle);
+            if (!ost->pkt && !(ost->pkt = av_packet_alloc()))
+                exit_program(1);
+            if (!check_output_constraints(ist, ost) || !ost->encoding_needed
+                || ost->enc->type != AVMEDIA_TYPE_SUBTITLE)
+                continue;
+
+            do_subtitle_out(output_files[ost->file_index], ost, decoded_frame);
+        }
     }
+    else
+        err = send_frame_to_filters(ist, decoded_frame);
 
-out:
-    if (free_sub)
-        avsubtitle_free(&subtitle);
-    return ret;
+    av_frame_free(&ist->subtitle_heartbeat.recent_sub);
+    ist->subtitle_heartbeat.recent_sub = av_frame_clone(decoded_frame);
+
+    av_frame_unref(ist->filter_frame);
+    av_frame_unref(decoded_frame);
+    return err < 0 ? err : ret;
 }
 
 static int send_filter_eof(InputStream *ist)
@@ -2710,7 +2647,7 @@  static int process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eo
         case AVMEDIA_TYPE_SUBTITLE:
             if (repeating)
                 break;
-            ret = transcode_subtitles(ist, avpkt, &got_output, &decode_failed);
+            ret = decode_subtitles(ist, avpkt, &got_output, &decode_failed);
             if (!pkt && ret >= 0)
                 ret = AVERROR_EOF;
             av_packet_unref(avpkt);
@@ -2983,8 +2920,6 @@  FF_ENABLE_DEPRECATION_WARNINGS
                 av_log(NULL, AV_LOG_WARNING, "Warning using DVB subtitles for filtering and output at the same time is not fully supported, also see -compute_edt [0|1]\n");
         }
 
-        av_dict_set(&ist->decoder_opts, "sub_text_format", "ass", AV_DICT_DONT_OVERWRITE);
-
         /* Useful for subtitles retiming by lavf (FIXME), skipping samples in
          * audio, and video decoders such as cuvid or mediacodec */
         ist->dec_ctx->pkt_timebase = ist->st->time_base;
@@ -3582,19 +3517,14 @@  static int init_output_stream(OutputStream *ost, AVFrame *frame,
         }
 
         if (ist && ist->dec->type == AVMEDIA_TYPE_SUBTITLE && ost->enc->type == AVMEDIA_TYPE_SUBTITLE) {
-            int input_props = 0, output_props = 0;
-            AVCodecDescriptor const *input_descriptor =
-                avcodec_descriptor_get(dec->codec_id);
-            AVCodecDescriptor const *output_descriptor =
-                avcodec_descriptor_get(ost->enc_ctx->codec_id);
-            if (input_descriptor)
-                input_props = input_descriptor->props & (AV_CODEC_PROP_TEXT_SUB | AV_CODEC_PROP_BITMAP_SUB);
-            if (output_descriptor)
-                output_props = output_descriptor->props & (AV_CODEC_PROP_TEXT_SUB | AV_CODEC_PROP_BITMAP_SUB);
-            if (input_props && output_props && input_props != output_props) {
-                snprintf(error, error_len,
-                         "Subtitle encoding currently only possible from text to text "
-                         "or bitmap to bitmap");
+            AVCodecDescriptor const *input_descriptor     = avcodec_descriptor_get(dec->codec_id);
+            AVCodecDescriptor const *output_descriptor    = avcodec_descriptor_get(ost->enc_ctx->codec_id);
+            const enum AVSubtitleType in_subtitle_format  = output_descriptor ? av_get_subtitle_format_from_codecdesc(input_descriptor) : AV_SUBTITLE_FMT_UNKNOWN;
+            const enum AVSubtitleType out_subtitle_format = output_descriptor ? av_get_subtitle_format_from_codecdesc(output_descriptor) : AV_SUBTITLE_FMT_UNKNOWN;
+
+            if (in_subtitle_format != AV_SUBTITLE_FMT_UNKNOWN && out_subtitle_format != AV_SUBTITLE_FMT_UNKNOWN
+                && in_subtitle_format != out_subtitle_format) {
+                snprintf(error, error_len, "Subtitle encoding is only possible from text to text or bitmap to bitmap");
                 return AVERROR_INVALIDDATA;
             }
         }
@@ -4627,7 +4557,7 @@  static int process_input(int file_index)
                av_ts2timestr(input_files[ist->file_index]->ts_offset, &AV_TIME_BASE_Q));
     }
 
-    sub2video_heartbeat(ist, pkt->pts);
+    subtitle_heartbeat(ist, pkt->pts);
 
     process_input_packet(ist, pkt, 0);
 
@@ -4839,6 +4769,7 @@  static int transcode(void)
     /* at the end of stream, we must flush the decoder buffers */
     for (i = 0; i < nb_input_streams; i++) {
         ist = input_streams[i];
+        ist->subtitle_heartbeat.is_active = 0;
         if (!input_files[ist->file_index]->eof_reached) {
             process_input_packet(ist, NULL, 0);
         }
diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 1194bb0cae..5cc2031653 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -348,17 +348,17 @@  typedef struct InputStream {
     struct { /* previous decoded subtitle and related variables */
         int got_output;
         int ret;
-        AVSubtitle subtitle;
+        AVFrame *subtitle;
     } prev_sub;
 
-    struct sub2video {
+    struct subtitle_heartbeat {
+        int is_active;
         int64_t last_pts;
         int64_t end_pts;
-        AVFifoBuffer *sub_queue;    ///< queue of AVSubtitle* before filter init
-        AVFrame *frame;
+        AVFrame *recent_sub;
         int w, h;
-        unsigned int initialize; ///< marks if sub2video_update should force an initialization
-    } sub2video;
+        char *header;
+    } subtitle_heartbeat;
 
     /* decoded data from this stream goes into all those filters
      * currently video and audio only */
@@ -660,8 +660,6 @@  int filtergraph_is_simple(FilterGraph *fg);
 int init_simple_filtergraph(InputStream *ist, OutputStream *ost);
 int init_complex_filtergraph(FilterGraph *fg);
 
-void sub2video_update(InputStream *ist, int64_t heartbeat_pts, AVSubtitle *sub);
-
 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame);
 
 int ffmpeg_parse_options(int argc, char **argv);
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index 6b7b6ca1b3..983b49cb8b 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -22,6 +22,9 @@ 
 
 #include "ffmpeg.h"
 
+#include <libavcodec/ass_split.h>
+#include <libavfilter/internal.h>
+
 #include "libavfilter/avfilter.h"
 #include "libavfilter/buffersink.h"
 #include "libavfilter/buffersrc.h"
@@ -221,9 +224,8 @@  static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
     int i;
 
-    // TODO: support other filter types
-    if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
-        av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
+    if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO && type != AVMEDIA_TYPE_SUBTITLE) {
+        av_log(NULL, AV_LOG_FATAL, "Only video, audio and subtitle filters supported "
                "currently.\n");
         exit_program(1);
     }
@@ -244,8 +246,9 @@  static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
         for (i = 0; i < s->nb_streams; i++) {
             enum AVMediaType stream_type = s->streams[i]->codecpar->codec_type;
             if (stream_type != type &&
-                !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
-                  type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
+                // in the followng case we auto-insert the graphicsub2video conversion filter 
+                // for retaining compatibility with the previous sub2video hack
+                !(stream_type == AVMEDIA_TYPE_SUBTITLE && type == AVMEDIA_TYPE_VIDEO))
                 continue;
             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
                 st = s->streams[i];
@@ -416,6 +419,37 @@  static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
     return 0;
 }
 
+static int configure_output_subtitle_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
+{
+    OutputStream *ost = ofilter->ost;
+    AVFilterContext *last_filter = out->filter_ctx;
+    int pad_idx = out->pad_idx;
+    int ret;
+    char name[255];
+
+    snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
+    ret = avfilter_graph_create_filter(&ofilter->filter,
+                                       avfilter_get_by_name("sbuffersink"),
+                                       name, NULL, NULL, fg->graph);
+
+    if (ret < 0)
+        return ret;
+
+    ////snprintf(name, sizeof(name), "trim_out_%d_%d",
+    ////         ost->file_index, ost->index);
+    ////ret = insert_trim(of->start_time, of->recording_time,
+    ////                  &last_filter, &pad_idx, name);
+    ////if (ret < 0)
+    ////    return ret;
+
+    ////ost->st->codecpar->codec_tag = MKTAG('a', 's', 's', 's');
+
+    if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
+        return ret;
+
+    return 0;
+}
+
 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 {
     char *pix_fmts;
@@ -594,7 +628,8 @@  static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
         int i;
 
         for (i=0; i<of->ctx->nb_streams; i++)
-            if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
+            if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
+                of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
                 break;
 
         if (i<of->ctx->nb_streams) {
@@ -628,6 +663,7 @@  static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter,
     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
+    case AVMEDIA_TYPE_SUBTITLE: return configure_output_subtitle_filter(fg, ofilter, out);
     default: av_assert0(0); return 0;
     }
 }
@@ -647,51 +683,103 @@  void check_filter_outputs(void)
     }
 }
 
-static int sub2video_prepare(InputStream *ist, InputFilter *ifilter)
+static int configure_input_subtitle_filter(FilterGraph *fg, InputFilter *ifilter,
+                                        AVFilterInOut *in)
 {
-    AVFormatContext *avf = input_files[ist->file_index]->ctx;
-    int i, w, h;
+    AVFilterContext *last_filter;
+    const AVFilter *buffer_filt = avfilter_get_by_name("sbuffer");
+    InputStream *ist = ifilter->ist;
+    AVBPrint args;
+    char name[255];
+    int ret, pad_idx = 0;
+    int w, h;
+    AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
+
+    if (!par)
+        return AVERROR(ENOMEM);
+    memset(par, 0, sizeof(*par));
+    par->format = AV_PIX_FMT_NONE;
+
+    if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot connect subtitle filter to audio input\n");
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot connect subtitle filter to video input\n");
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if (!ist->subtitle_heartbeat.header && ist->dec_ctx->subtitle_header)
+        ist->subtitle_heartbeat.header = av_strdup((char *)ist->dec_ctx->subtitle_header);
+
+    ist->subtitle_heartbeat.is_active = 1;
 
-    /* Compute the size of the canvas for the subtitles stream.
-       If the subtitles codecpar has set a size, use it. Otherwise use the
-       maximum dimensions of the video streams in the same file. */
     w = ifilter->width;
     h = ifilter->height;
+
     if (!(w && h)) {
-        for (i = 0; i < avf->nb_streams; i++) {
-            if (avf->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
-                w = FFMAX(w, avf->streams[i]->codecpar->width);
-                h = FFMAX(h, avf->streams[i]->codecpar->height);
-            }
-        }
-        if (!(w && h)) {
-            w = FFMAX(w, 720);
-            h = FFMAX(h, 576);
-        }
-        av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
+        w = ist->dec_ctx->width;
+        h = ist->dec_ctx->height;
     }
-    ist->sub2video.w = ifilter->width  = w;
-    ist->sub2video.h = ifilter->height = h;
 
-    ifilter->width  = ist->dec_ctx->width  ? ist->dec_ctx->width  : ist->sub2video.w;
-    ifilter->height = ist->dec_ctx->height ? ist->dec_ctx->height : ist->sub2video.h;
+    if (!(w && h) && ist->dec_ctx->subtitle_header) {
+        ASSSplitContext *ass_ctx = ff_ass_split((char *)ist->dec_ctx->subtitle_header);
+        ASS *ass = (ASS *)ass_ctx;
+        w = ass->script_info.play_res_x;
+        h = ass->script_info.play_res_y;
+        ff_ass_split_free(ass_ctx);
+    }
 
-    /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
-       palettes for all rectangles are identical or compatible */
-    ifilter->format = AV_PIX_FMT_RGB32;
+    ist->subtitle_heartbeat.w = w;
+    ist->subtitle_heartbeat.h = h;
+    av_log(ifilter, AV_LOG_INFO, "subtitle input filter: decoding size %dx%d\n", ist->subtitle_heartbeat.w, ist->subtitle_heartbeat.h);
 
-    ist->sub2video.frame = av_frame_alloc();
-    if (!ist->sub2video.frame)
-        return AVERROR(ENOMEM);
-    ist->sub2video.last_pts = INT64_MIN;
-    ist->sub2video.end_pts  = INT64_MIN;
+    ifilter->width = w;
+    ifilter->height = h;
+
+    ist->subtitle_heartbeat.last_pts = INT64_MIN;
+
+    snprintf(name, sizeof(name), "graph %d subtitle input from stream %d:%d", fg->index,
+             ist->file_index, ist->st->index);
+
+
+    av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
+    av_bprintf(&args,
+             "subtitle_type=%d:time_base=%d/%d:",
+             ifilter->format,
+             ist->st->time_base.num, ist->st->time_base.den);
+    if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
+                                            args.str, NULL, fg->graph)) < 0)
+        goto fail;
 
-    /* sub2video structure has been (re-)initialized.
-       Mark it as such so that the system will be
-       initialized with the first received heartbeat. */
-    ist->sub2video.initialize = 1;
+    par->hw_frames_ctx = ifilter->hw_frames_ctx;
+    par->format = ifilter->format;
+    par->width = ifilter->width;
+    par->height = ifilter->height;
+
+    ret = av_buffersrc_parameters_set(ifilter->filter, par);
+    if (ret < 0)
+        goto fail;
+    av_freep(&par);
+    last_filter = ifilter->filter;
+
+    if (in->filter_ctx->input_pads[in->pad_idx].type == AVMEDIA_TYPE_VIDEO) {
+        ret = insert_filter(&last_filter, &pad_idx, "graphicsub2video", NULL);
+        if (ret < 0)
+            return ret;
+    }
+
+    if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
+        return ret;
 
     return 0;
+fail:
+    av_freep(&par);
+
+    return ret;
 }
 
 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
@@ -709,8 +797,15 @@  static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
     char name[255];
     int ret, pad_idx = 0;
     int64_t tsoffset = 0;
-    AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
+    AVBufferSrcParameters *par;
 
+    if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
+        // Automatically insert conversion filter to retain compatibility
+        // with sub2video command lines
+        return configure_input_subtitle_filter(fg, ifilter, in);
+    }
+
+    par = av_buffersrc_parameters_alloc();
     if (!par)
         return AVERROR(ENOMEM);
     memset(par, 0, sizeof(*par));
@@ -725,12 +820,6 @@  static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
     if (!fr.num)
         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 
-    if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
-        ret = sub2video_prepare(ist, ifilter);
-        if (ret < 0)
-            goto fail;
-    }
-
     sar = ifilter->sample_aspect_ratio;
     if(!sar.den)
         sar = (AVRational){0,1};
@@ -742,7 +831,7 @@  static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
              tb.num, tb.den, sar.num, sar.den);
     if (fr.num && fr.den)
         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
-    snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
+    snprintf(name, sizeof(name), "graph %d video input from stream %d:%d", fg->index,
              ist->file_index, ist->st->index);
 
 
@@ -938,6 +1027,7 @@  static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
+    case AVMEDIA_TYPE_SUBTITLE: return configure_input_subtitle_filter(fg, ifilter, in);
     default: av_assert0(0); return 0;
     }
 }
@@ -1105,19 +1195,6 @@  int configure_filtergraph(FilterGraph *fg)
         }
     }
 
-    /* process queued up subtitle packets */
-    for (i = 0; i < fg->nb_inputs; i++) {
-        InputStream *ist = fg->inputs[i]->ist;
-        if (ist->sub2video.sub_queue && ist->sub2video.frame) {
-            while (av_fifo_size(ist->sub2video.sub_queue)) {
-                AVSubtitle tmp;
-                av_fifo_generic_read(ist->sub2video.sub_queue, &tmp, sizeof(tmp), NULL);
-                sub2video_update(ist, INT64_MIN, &tmp);
-                avsubtitle_free(&tmp);
-            }
-        }
-    }
-
     return 0;
 
 fail:
@@ -1138,6 +1215,7 @@  int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
     ifilter->sample_rate         = frame->sample_rate;
     ifilter->channels            = frame->channels;
     ifilter->channel_layout      = frame->channel_layout;
+    ifilter->type                = frame->type;
 
     if (frame->hw_frames_ctx) {
         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
diff --git a/fftools/ffmpeg_hw.c b/fftools/ffmpeg_hw.c
index 41aaf776d7..f8b49fd5ac 100644
--- a/fftools/ffmpeg_hw.c
+++ b/fftools/ffmpeg_hw.c
@@ -449,7 +449,7 @@  int hw_device_setup_for_encode(OutputStream *ost)
     AVBufferRef *frames_ref = NULL;
     int i;
 
-    if (ost->filter) {
+    if (ost->filter && ost->filter->filter) {
         frames_ref = av_buffersink_get_hw_frames_ctx(ost->filter->filter);
         if (frames_ref &&
             ((AVHWFramesContext*)frames_ref->data)->format ==
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 6ca28cf974..21b5228bb2 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -2149,8 +2149,9 @@  static void init_output_filter(OutputFilter *ofilter, OptionsContext *o,
     switch (ofilter->type) {
     case AVMEDIA_TYPE_VIDEO: ost = new_video_stream(o, oc, -1); break;
     case AVMEDIA_TYPE_AUDIO: ost = new_audio_stream(o, oc, -1); break;
+    case AVMEDIA_TYPE_SUBTITLE: ost = new_subtitle_stream(o, oc, -1); break;
     default:
-        av_log(NULL, AV_LOG_FATAL, "Only video and audio filters are supported "
+        av_log(NULL, AV_LOG_FATAL, "Only video, audio and subtitle filters are supported "
                "currently.\n");
         exit_program(1);
     }
diff --git a/tests/ref/fate/filter-overlay-dvdsub-2397 b/tests/ref/fate/filter-overlay-dvdsub-2397
index 483e5fa4e0..1f505ba2b2 100644
--- a/tests/ref/fate/filter-overlay-dvdsub-2397
+++ b/tests/ref/fate/filter-overlay-dvdsub-2397
@@ -490,368 +490,367 @@ 
 1,       3877,       3877,       10,     2013, 0x95a39f9c
 1,       3887,       3887,       10,     2013, 0x4f7ea123
 1,       3897,       3897,       10,     2013, 0x9efb9ba1
-0,        117,        117,        1,   518400, 0xbf8523da
+0,        117,        117,        1,   518400, 0x61e0f688
 1,       3907,       3907,       10,     2013, 0xf395b2cd
 1,       3917,       3917,       10,     2013, 0x261a881e
 1,       3927,       3927,       10,     2013, 0x7f2d9f72
 1,       3937,       3937,       10,     2013, 0x0105b38d
-0,        118,        118,        1,   518400, 0x41890ed6
+0,        118,        118,        1,   518400, 0xa47de755
 1,       3952,       3952,       10,     2013, 0x0e5db67e
 1,       3962,       3962,       10,     2013, 0xfc9baf97
-0,        119,        119,        1,   518400, 0x588534fc
+0,        119,        119,        1,   518400, 0xaade171d
 1,       3972,       3972,       10,     2013, 0x8e02a1b1
 1,       3982,       3982,       10,     2013, 0x6eecaac8
 1,       3992,       3992,       10,     2013, 0xf5558f0c
 1,       4002,       4002,       10,     2013, 0x512ba99b
-0,        120,        120,        1,   518400, 0x2145ebc1
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 1,       6148,       6148,       10,     2013, 0x6aebb406
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 1,       6168,       6168,       10,     2013, 0x99b7a8cc
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 1,       6188,       6188,       10,     2013, 0xbb6aa271
 1,       6198,       6198,       10,     2013, 0x17af9e4a
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 1,       6224,       6224,       10,     2013, 0xd6849b93
 1,       6234,       6234,       10,     2013, 0xe9829669
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 1,       6254,       6254,       10,     2013, 0x2b2099a4
 1,       6264,       6264,       10,     2013, 0x1033a82f
-0,        188,        188,        1,   518400, 0x82569002
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 1,       6274,       6274,       10,     2013, 0x5ec88990
 1,       6284,       6284,       10,     2013, 0xd2a19b3d
 1,       6299,       6299,       10,     2013, 0xa377b268
-0,        189,        189,        1,   518400, 0xfcb6d707
+0,        189,        189,        1,   518400, 0x06fbdb66
 1,       6309,       6309,       10,     2013, 0xfa859901
 1,       6319,       6319,       10,     2013, 0x1713955a
 1,       6329,       6329,       10,     2013, 0x70aab0da
 1,       6339,       6339,       10,     2013, 0xcdaea422
-0,        190,        190,        1,   518400, 0x82a9662b
+0,        190,        190,        1,   518400, 0xdf0d6390
 1,       6349,       6349,       10,     2013, 0x65c3bf80
 1,       6359,       6359,       10,     2013, 0x1d75a55f
 1,       6369,       6369,       10,     2013, 0xa5bea4de
-0,        191,        191,        1,   518400, 0x212e16ee
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 1,       6384,       6384,       10,     2013, 0x184db71c
 1,       6394,       6394,       10,     2013, 0x99858ec8
 1,       6404,       6404,       10,     2013, 0xb8f2aee5
-0,        192,        192,        1,   518400, 0x2ca34dca
+0,        192,        192,        1,   518400, 0x119531ed
 1,       6414,       6414,       10,     2013, 0x4435b2ef
 1,       6424,       6424,       10,     2013, 0x8acfa6c7
 1,       6434,       6434,       10,     2013, 0x42b4c01f
-0,        193,        193,        1,   518400, 0xe9ebe0a5
+0,        193,        193,        1,   518400, 0xc160bca8
 1,       6444,       6444,       10,     2013, 0x6e308c13
 1,       6454,       6454,       10,     2013, 0x8227a0f6
 1,       6470,       6470,       10,     2013, 0x6f12a7a2
-0,        194,        194,        1,   518400, 0x4e6b6917
+0,        194,        194,        1,   518400, 0xcd9b3639
 1,       6480,       6480,       10,     2013, 0x785392be
 1,       6490,       6490,       10,     2013, 0x81849c2b
 1,       6500,       6500,       10,     2013, 0x5cf2af65
-0,        195,        195,        1,   518400, 0x7dcf20ab
+0,        195,        195,        1,   518400, 0x7c4ad83a
 1,       6510,       6510,       10,     2013, 0x0c6ca6b4
 1,       6520,       6520,       10,     2013, 0x412fab9f
 1,       6530,       6530,       10,     2013, 0x08e792b4
-0,        196,        196,        1,   518400, 0xf30fac97
+0,        196,        196,        1,   518400, 0xe3255ff4
 1,       6540,       6540,       10,     2013, 0x407aace3
 1,       6555,       6555,       10,     2013, 0xd26bac16
 1,       6565,       6565,       10,     2013, 0xac8bb295
-0,        197,        197,        1,   518400, 0xcb9fc692
+0,        197,        197,        1,   518400, 0x257a6758
 1,       6575,       6575,       10,     2013, 0xddd1949c
 1,       6585,       6585,       10,     2013, 0x6b26b868
 1,       6595,       6595,       10,     2013, 0x5eaba587
 1,       6605,       6605,       10,     2013, 0xef0793b9
-0,        198,        198,        1,   518400, 0x5d05601e
+0,        198,        198,        1,   518400, 0xcfa4f4e0
 1,       6615,       6615,       10,     2013, 0xdef19bd6
 1,       6625,       6625,       10,     2013, 0xca98a635
-0,        199,        199,        1,   518400, 0x456c1417
+0,        199,        199,        1,   518400, 0x5f159eff
 1,       6640,       6640,       10,     2013, 0x06269a5a
 1,       6650,       6650,       10,     2013, 0x32cb9952
 1,       6660,       6660,       10,     2013, 0xf01fa95a
 1,       6670,       6670,       10,     2013, 0xefab9e55
-0,        200,        200,        1,   518400, 0x9a0fd1ad
+0,        200,        200,        1,   518400, 0x31d257bc
 1,       6680,       6680,       10,     2013, 0x55a3b63a
 1,       6690,       6690,       10,     2013, 0xcd36a553
 1,       6700,       6700,       10,     2013, 0x2ec19877
-0,        201,        201,        1,   518400, 0x55db9716
+0,        201,        201,        1,   518400, 0x81c516b9
 1,       6710,       6710,       10,     2013, 0xc18b924c
 1,       6726,       6726,       10,     2013, 0xf132b04c
 1,       6736,       6736,       10,     2013, 0x7975a44d
-0,        202,        202,        1,   518400, 0x1f0d40d6
+0,        202,        202,        1,   518400, 0x56b7bf87
 1,       6746,       6746,       10,     2013, 0x2aaf94cb
 1,       6756,       6756,       10,     2013, 0x58cfa60f
 1,       6766,       6766,       10,     2013, 0x9757a658
-0,        203,        203,        1,   518400, 0x73695c82
+0,        203,        203,        1,   518400, 0x4f83dd2e
 1,       6776,       6776,       10,     2013, 0x67ebc0d5
 1,       6786,       6786,       10,     2013, 0x3c50a70e
 1,       6796,       6796,       10,     2013, 0x9c5799c6
-0,        204,        204,        1,   518400, 0xb0f10812
+0,        204,        204,        1,   518400, 0x0d4389d7
 1,       6811,       6811,       10,     2013, 0x018d85b2
 1,       6821,       6821,       10,     2013, 0x5367a956
-0,        205,        205,        1,   518400, 0xdec18505
-0,        208,        208,        1,   518400, 0xb147b947
-0,        240,        240,        1,   518400, 0x9d2e3977
+0,        205,        205,        1,   518400, 0x375b056f
+0,        208,        208,        1,   518400, 0x9d2e3977
diff --git a/tests/ref/fate/sub-dvb b/tests/ref/fate/sub-dvb
index cbd1801d64..8f33c75d70 100644
--- a/tests/ref/fate/sub-dvb
+++ b/tests/ref/fate/sub-dvb
@@ -1,75 +1,93 @@ 
 #tb 0: 1/1000000
 #media_type 0: subtitle
 #codec_id 0: dvb_subtitle
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-0,   15760000,   15760000,   239000,     1544, 0xe60f1751
-0,   15999000,   15999000,   239000,       14, 0x0729010b
-0,   16000000,   16000000,   339000,     1658, 0xbe343093
-0,   16339000,   16339000,   339000,       14, 0x0809012b
-0,   16340000,   16340000,   599000,     2343, 0xc68f07ef
-0,   16939000,   16939000,   599000,       14, 0x08e9014b
-0,   16940000,   16940000,   459000,     2568, 0x0ee657b1
-0,   17399000,   17399000,   459000,       14, 0x09c9016b
-0,   17400000,   17400000,   359000,     3422, 0xba5b63ce
-0,   17759000,   17759000,   359000,       14, 0x0aa9018b
-0,   17760000,   17760000,   219000,     5078, 0x95b19902
-0,   17979000,   17979000,   219000,       14, 0x0b8901ab
-0,   17980000,   17980000,   959000,     5808, 0xc9717b89
-0,   18939000,   18939000,   959000,       14, 0x0c6901cb
-0,   18940000,   18940000,   219000,     6015, 0x0becbfac
-0,   19159000,   19159000,   219000,       14, 0x064900eb
-0,   19160000,   19160000,   259000,     6519, 0xfcd24d26
-0,   19419000,   19419000,   259000,       14, 0x0729010b
-0,   19420000,   19420000,    99000,     7061, 0xf0320408
-0,   19519000,   19519000,    99000,       14, 0x0809012b
-0,   19520000,   19520000,   219000,     4773, 0x66c93074
-0,   19739000,   19739000,   219000,       14, 0x08e9014b
-0,   19740000,   19740000,   219000,     5546, 0x06052c81
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-0,   20199000,   20199000,   239000,       14, 0x0aa9018b
-0,   20200000,   20200000,   139000,     6099, 0xe30cde07
-0,   20339000,   20339000,   139000,       14, 0x0b8901ab
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-0,   21139000,   21139000,   799000,       14, 0x0c6901cb
-0,   21140000,   21140000,   239000,     4744, 0xa91e1b41
-0,   21379000,   21379000,   239000,       14, 0x064900eb
-0,   21380000,   21380000,   339000,     5824, 0xcf6d782b
-0,   21719000,   21719000,   339000,       14, 0x0729010b
-0,   21720000,   21720000,  1439000,     6212, 0xabf8f7cf
-0,   23159000,   23159000,  1439000,       14, 0x0809012b
-0,   23160000,   23160000,  1319000,     7082, 0xd7ca10f2
-0,   24479000,   24479000,  1319000,       14, 0x08e9014b
-0,   24480000,   24480000,   219000,     5345, 0x12b2cae0
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-0,   29359000,   29359000,   219000,       14, 0x0809012b
-0,   29360000,   29360000,  1679000,     5358, 0x29e30c48
-0,   31039000,   31039000,  1679000,       14, 0x08e9014b
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+0,     280000,     280000,  4999000,       14, 0x06b900fb
+0,    5279000,    5279000,  4999000,       14, 0x0729010b
+0,    5280000,    5280000,  5019000,       14, 0x0799011b
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+0,   15559000,   15559000,  1439000,       14, 0x0aa9018b
+0,   15560000,   15560000,    39000,       14, 0x0b19019b
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+0,   15759000,   15759000,   159000,       14, 0x0c6901cb
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+0,   15999000,   15999000,   239000,       14, 0x064900eb
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+0,   16339000,   16339000,   339000,       14, 0x0729010b
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+0,   16939000,   16939000,   599000,       14, 0x0809012b
+0,   16940000,   16940000,   459000,     2568, 0x6eaa5751
+0,   17399000,   17399000,   459000,       14, 0x08e9014b
+0,   17400000,   17400000,   359000,     3422, 0xd9d0636e
+0,   17759000,   17759000,   359000,       14, 0x09c9016b
+0,   17760000,   17760000,   219000,     5078, 0x722c9862
+0,   17979000,   17979000,   219000,       14, 0x0aa9018b
+0,   17980000,   17980000,   959000,     5808, 0x38dd7ae9
+0,   18939000,   18939000,   959000,       14, 0x0b8901ab
+0,   18940000,   18940000,   219000,     6015, 0xd4d2c40c
+0,   19159000,   19159000,   219000,       14, 0x0c6901cb
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+0,   19419000,   19419000,   259000,       14, 0x064900eb
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+0,   20200000,   20200000,   139000,     6099, 0xa409dd67
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+0,   21379000,   21379000,   239000,       14, 0x0c6901cb
+0,   21380000,   21380000,   339000,     5824, 0x5299778b
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+0,   26339000,   26339000,   359000,       14, 0x064900eb
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+0,   26559000,   26559000,   219000,       14, 0x0729010b
+0,   26560000,   26560000,   719000,     4785, 0xcd3f3f20
+0,   27279000,   27279000,   719000,       14, 0x0809012b
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+0,   28299000,   28299000,   219000,       14, 0x0b8901ab
+0,   28300000,   28300000,   239000,     7366, 0x98bf842d
+0,   28539000,   28539000,   239000,       14, 0x0c6901cb
+0,   28540000,   28540000,   599000,     4564, 0x3d9600ab
+0,   29139000,   29139000,   599000,       14, 0x064900eb
+0,   29140000,   29140000,   219000,     4637, 0x01f02617
+0,   29359000,   29359000,   219000,       14, 0x0729010b
+0,   29360000,   29360000,  1679000,     5358, 0x5b0f0ba8
+0,   31039000,   31039000,  1679000,       14, 0x0809012b
+0,   31040000,   31040000,   359000,       14, 0x0879013b
+0,   31399000,   31399000,   359000,       14, 0x08e9014b
+0,   31400000,   31400000,   479000,       14, 0x0959015b
+0,   31879000,   31879000,   479000,       14, 0x09c9016b
diff --git a/tests/ref/fate/sub2video b/tests/ref/fate/sub2video
index 80abe9c905..f2af5e7d1c 100644
--- a/tests/ref/fate/sub2video
+++ b/tests/ref/fate/sub2video
@@ -10,32 +10,31 @@ 
 0,          0,          0,        1,   518400, 0x83c27b82
 0,          1,          1,        1,   518400, 0x4051c7f9
 0,          2,          2,        1,   518400, 0xfb00e17e
-1,     499000,     499000,  4960000,     1015, 0x19e092d2
-0,          3,          3,        1,   518400, 0x192abb74
-0,          4,          4,        1,   518400, 0x4669a88b
-0,          5,          5,        1,   518400, 0xaababe00
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-0,          7,          7,        1,   518400, 0x440e7547
-0,          8,          8,        1,   518400, 0xca5bb496
-0,          9,          9,        1,   518400, 0xf86e0b0a
-0,         10,         10,        1,   518400, 0xb80fa020
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-0,         18,         18,        1,   518400, 0xc92e2caf
-0,         19,         19,        1,   518400, 0x3fe36eea
-0,         20,         20,        1,   518400, 0x0891e8d5
-0,         21,         21,        1,   518400, 0x84655095
-0,         22,         22,        1,   518400, 0x9c7fa014
-0,         23,         23,        1,   518400, 0x9c43b656
-0,         24,         24,        1,   518400, 0x2cf46221
-0,         25,         25,        1,   518400, 0x7322e11c
-0,         26,         26,        1,   518400, 0x45af1a84
-0,         27,         27,        1,   518400, 0x7b781071
+0,          3,          3,        1,   518400, 0x17f5f77c
+0,          4,          4,        1,   518400, 0x427fe2ce
+0,          5,          5,        1,   518400, 0x76d8fe7b
+0,          6,          6,        1,   518400, 0x167c5c28
+0,          7,          7,        1,   518400, 0x1d54c98e
+0,          8,          8,        1,   518400, 0x664016a4
+0,          9,          9,        1,   518400, 0x4a477278
+0,         10,         10,        1,   518400, 0xc3beffb4
+0,         11,         11,        1,   518400, 0xf052f750
+0,         12,         12,        1,   518400, 0xcd9e399a
+0,         13,         13,        1,   518400, 0x1843d70b
+0,         14,         14,        1,   518400, 0x4737acf9
+0,         15,         15,        1,   518400, 0x3a9961a0
+0,         16,         16,        1,   518400, 0x2dce2c74
+0,         17,         17,        1,   518400, 0x1d601ddc
+0,         18,         18,        1,   518400, 0xb47429b1
+0,         19,         19,        1,   518400, 0xfab24433
+0,         20,         20,        1,   518400, 0xd69d8e91
+0,         21,         21,        1,   518400, 0xc8b8ce57
+0,         22,         22,        1,   518400, 0xf6a90e9c
+0,         23,         23,        1,   518400, 0x11cc1ec4
+0,         24,         24,        1,   518400, 0xcad7cd01
+0,         25,         25,        1,   518400, 0x01596125
+0,         26,         26,        1,   518400, 0xc2b7aca0
+0,         27,         27,        1,   518400, 0x8b2d9fde
 0,         28,         28,        1,   518400, 0x4f7c706c
 0,         29,         29,        1,   518400, 0xb227603b
 0,         30,         30,        1,   518400, 0x7b4b89c2
@@ -58,129 +57,86 @@ 
 0,         47,         47,        1,   518400, 0xde69683f
 0,         48,         48,        1,   518400, 0x7df08fba
 0,         49,         49,        1,   518400, 0xbab197ea
-1,   15355000,   15355000,  4733000,     2094, 0x3c171425
-0,         77,         77,        1,   518400, 0x902285d9
+0,         77,         77,        1,   518400, 0xbab197ea
 0,        100,        100,        1,   518400, 0xbab197ea
-1,   48797000,   48797000,  2560000,     2480, 0x7c0edf21
-0,        244,        244,        1,   518400, 0x7a11c812
+0,        244,        244,        1,   518400, 0xbab197ea
 0,        257,        257,        1,   518400, 0xbab197ea
-1,   51433000,   51433000,  2366000,     3059, 0xc95b8a05
-0,        258,        258,        1,   518400, 0x34cdddee
+0,        258,        258,        1,   518400, 0xbab197ea
 0,        269,        269,        1,   518400, 0xbab197ea
-1,   53910000,   53910000,  2696000,     2095, 0x61bb15ed
-0,        270,        270,        1,   518400, 0x4db4ce51
+0,        270,        270,        1,   518400, 0xbab197ea
 0,        283,        283,        1,   518400, 0xbab197ea
-1,   56663000,   56663000,  1262000,     1013, 0xc9ae89b7
-0,        284,        284,        1,   518400, 0xe6bc0ea9
+0,        284,        284,        1,   518400, 0xbab197ea
 0,        290,        290,        1,   518400, 0xbab197ea
-1,   58014000,   58014000,  1661000,      969, 0xe01878f0
-0,        291,        291,        1,   518400, 0xa8643af7
+0,        291,        291,        1,   518400, 0xbab197ea
 0,        298,        298,        1,   518400, 0xbab197ea
-1,   67724000,   67724000,  1365000,      844, 0xe7db4fc1
-0,        339,        339,        1,   518400, 0xb1885c67
+0,        339,        339,        1,   518400, 0xbab197ea
 0,        345,        345,        1,   518400, 0xbab197ea
-1,   69175000,   69175000,  1558000,      802, 0xf48531ba
-0,        346,        346,        1,   518400, 0x378e3fd0
+0,        346,        346,        1,   518400, 0xbab197ea
 0,        354,        354,        1,   518400, 0xbab197ea
-1,   70819000,   70819000,  1865000,     1709, 0xb4d5a1bd
-0,        355,        355,        1,   518400, 0xa3782469
+0,        355,        355,        1,   518400, 0xbab197ea
 0,        363,        363,        1,   518400, 0xbab197ea
-1,   72762000,   72762000,  1968000,     2438, 0x99d7bc82
-0,        364,        364,        1,   518400, 0xba23a0d5
+0,        364,        364,        1,   518400, 0xbab197ea
 0,        374,        374,        1,   518400, 0xbab197ea
-1,   74806000,   74806000,  1831000,     2116, 0x96514097
-0,        375,        375,        1,   518400, 0x129de2f8
+0,        375,        375,        1,   518400, 0xbab197ea
 0,        383,        383,        1,   518400, 0xbab197ea
-1,   76716000,   76716000,  1262000,     1822, 0xefccc72e
-0,        384,        384,        1,   518400, 0x19772f0f
+0,        384,        384,        1,   518400, 0xbab197ea
 0,        390,        390,        1,   518400, 0xbab197ea
-1,   78051000,   78051000,  1524000,      987, 0x7b927a27
-0,        391,        391,        1,   518400, 0x56f54e73
+0,        391,        391,        1,   518400, 0xbab197ea
 0,        398,        398,        1,   518400, 0xbab197ea
-1,   79644000,   79644000,  2662000,     2956, 0x190778f7
-0,        399,        399,        1,   518400, 0x300b5247
-1,   82380000,   82380000,  2764000,     3094, 0xc021b7d3
+0,        399,        399,        1,   518400, 0xbab197ea
 0,        412,        412,        1,   518400, 0xbab197ea
-0,        413,        413,        1,   518400, 0x6fd028fa
+0,        413,        413,        1,   518400, 0xbab197ea
 0,        426,        426,        1,   518400, 0xbab197ea
-1,   85225000,   85225000,  2366000,     2585, 0x74d0048f
-0,        427,        427,        1,   518400, 0x01f80e9d
+0,        427,        427,        1,   518400, 0xbab197ea
 0,        438,        438,        1,   518400, 0xbab197ea
-1,   87652000,   87652000,  1831000,      634, 0x8832fda1
-0,        439,        439,        1,   518400, 0xb48d90c0
+0,        439,        439,        1,   518400, 0xbab197ea
 0,        447,        447,        1,   518400, 0xbab197ea
-1,   91531000,   91531000,  2332000,     2080, 0x97a1146f
-0,        458,        458,        1,   518400, 0xcb5a0173
+0,        458,        458,        1,   518400, 0xbab197ea
 0,        469,        469,        1,   518400, 0xbab197ea
-1,   95510000,   95510000,  3299000,     2964, 0x8b8f6684
-0,        478,        478,        1,   518400, 0xb8a323e4
+0,        478,        478,        1,   518400, 0xbab197ea
 0,        494,        494,        1,   518400, 0xbab197ea
-1,   98872000,   98872000,  2161000,     1875, 0x9002ef71
-0,        495,        495,        1,   518400, 0xc43518ba
+0,        495,        495,        1,   518400, 0xbab197ea
 0,        505,        505,        1,   518400, 0xbab197ea
-1,  101124000,  101124000,  4096000,     3872, 0x20c6ed9c
-0,        506,        506,        1,   518400, 0x04e38692
+0,        506,        506,        1,   518400, 0xbab197ea
 0,        526,        526,        1,   518400, 0xbab197ea
-1,  105303000,  105303000,  2730000,     3094, 0xf203a663
-0,        527,        527,        1,   518400, 0x856b0ee5
+0,        527,        527,        1,   518400, 0xbab197ea
 0,        540,        540,        1,   518400, 0xbab197ea
-1,  108106000,  108106000,  2059000,     2404, 0x41a7b429
-0,        541,        541,        1,   518400, 0x3e5beee2
+0,        541,        541,        1,   518400, 0xbab197ea
 0,        551,        551,        1,   518400, 0xbab197ea
-1,  141556000,  141556000,  1661000,     1088, 0xde20aa20
-0,        708,        708,        1,   518400, 0xb8bc1365
+0,        708,        708,        1,   518400, 0xbab197ea
 0,        716,        716,        1,   518400, 0xbab197ea
-0,        817,        817,        1,   518400, 0x83efa32d
-1,  163445000,  163445000,  1331000,      339, 0x8bd186ef
+0,        817,        817,        1,   518400, 0xbab197ea
 0,        824,        824,        1,   518400, 0xbab197ea
-0,        840,        840,        1,   518400, 0x03ea0e90
-1,  168049000,  168049000,  1900000,     1312, 0x0bf20e8d
+0,        840,        840,        1,   518400, 0xbab197ea
 0,        850,        850,        1,   518400, 0xbab197ea
-1,  170035000,  170035000,  1524000,     1279, 0xb6c2dafe
-0,        851,        851,        1,   518400, 0x8780239e
+0,        851,        851,        1,   518400, 0xbab197ea
 0,        858,        858,        1,   518400, 0xbab197ea
-0,        861,        861,        1,   518400, 0x6eb72347
-1,  172203000,  172203000,  1695000,     1826, 0x9a1ac769
+0,        861,        861,        1,   518400, 0xbab197ea
 0,        869,        869,        1,   518400, 0xbab197ea
-1,  173947000,  173947000,  1934000,     1474, 0xa9b03cdc
-0,        870,        870,        1,   518400, 0x9c4a3a3d
+0,        870,        870,        1,   518400, 0xbab197ea
 0,        879,        879,        1,   518400, 0xbab197ea
-1,  175957000,  175957000,  1763000,     1019, 0x20409355
-0,        880,        880,        1,   518400, 0xc9ebfa89
+0,        880,        880,        1,   518400, 0xbab197ea
 0,        889,        889,        1,   518400, 0xbab197ea
-0,        946,        946,        1,   518400, 0xbaf801ef
-1,  189295000,  189295000,  1968000,     1596, 0x408c726e
+0,        946,        946,        1,   518400, 0xbab197ea
 0,        956,        956,        1,   518400, 0xbab197ea
-1,  191356000,  191356000,  1228000,     1517, 0xae8c5c2b
-0,        957,        957,        1,   518400, 0x59f4e72f
+0,        957,        957,        1,   518400, 0xbab197ea
 0,        963,        963,        1,   518400, 0xbab197ea
-1,  192640000,  192640000,  1763000,     2506, 0xa458d6d4
-0,        964,        964,        1,   518400, 0x9d5b9d69
+0,        964,        964,        1,   518400, 0xbab197ea
 0,        972,        972,        1,   518400, 0xbab197ea
-1,  195193000,  195193000,  1092000,     1074, 0x397ba9a8
-0,        976,        976,        1,   518400, 0x923d1ce7
+0,        976,        976,        1,   518400, 0xbab197ea
 0,        981,        981,        1,   518400, 0xbab197ea
-1,  196361000,  196361000,  1524000,     1715, 0x695ca41e
-0,        982,        982,        1,   518400, 0x6e652cd2
+0,        982,        982,        1,   518400, 0xbab197ea
 0,        989,        989,        1,   518400, 0xbab197ea
-1,  197946000,  197946000,  1160000,      789, 0xc63a189e
-0,        990,        990,        1,   518400, 0x25113966
+0,        990,        990,        1,   518400, 0xbab197ea
 0,        996,        996,        1,   518400, 0xbab197ea
-1,  199230000,  199230000,  1627000,     1846, 0xeea8c599
-0,        997,        997,        1,   518400, 0x2dc83609
+0,        997,        997,        1,   518400, 0xbab197ea
 0,       1004,       1004,        1,   518400, 0xbab197ea
-1,  200924000,  200924000,  1763000,      922, 0xd4a87222
-0,       1005,       1005,        1,   518400, 0x90483bc6
+0,       1005,       1005,        1,   518400, 0xbab197ea
 0,       1013,       1013,        1,   518400, 0xbab197ea
-0,       1053,       1053,        1,   518400, 0x3de86ab7
-1,  210600000,  210600000,  1831000,      665, 0x55580135
+0,       1053,       1053,        1,   518400, 0xbab197ea
 0,       1062,       1062,        1,   518400, 0xbab197ea
-1,  214771000,  214771000,  1558000,     1216, 0x50d1f6c5
-0,       1074,       1074,        1,   518400, 0x8c320e68
+0,       1074,       1074,        1,   518400, 0xbab197ea
 0,       1082,       1082,        1,   518400, 0xbab197ea
-0,       1128,       1128,        1,   518400, 0x81e977b2
-1,  225640000,  225640000,  2127000,     2133, 0x670c11a5
+0,       1128,       1128,        1,   518400, 0xbab197ea
 0,       1139,       1139,        1,   518400, 0xbab197ea
-1,  227834000,  227834000,  1262000,     1264, 0xc1d9fc57
-0,       1140,       1140,        1,   518400, 0xb046dd30
-0,       1145,       1145,        1,   518400, 0xbab197ea
+0,       1140,       1140,        1,   518400, 0xbab197ea
diff --git a/tests/ref/fate/sub2video_basic b/tests/ref/fate/sub2video_basic
index 5f72e292c9..a6ada040b4 100644
--- a/tests/ref/fate/sub2video_basic
+++ b/tests/ref/fate/sub2video_basic
@@ -2,94 +2,89 @@ 
 #media_type 0: video
 #codec_id 0: rawvideo
 #dimensions 0: 720x480
-#sar 0: 0/1
-0,       3312,       3312,        1,  1382400, 0x00000000
-0,       3312,       3312,        1,  1382400, 0x8c93c2ba
+#sar 0: 1/1
+0,       3312,       3312,        1,  1382400, 0xb890339a
 0,       3436,       3436,        1,  1382400, 0x00000000
-0,       3684,       3684,        1,  1382400, 0xb02e32ca
+0,       3684,       3684,        1,  1382400, 0x0eca3de2
 0,       3802,       3802,        1,  1382400, 0x00000000
-0,       4520,       4520,        1,  1382400, 0x83b71116
+0,       4520,       4520,        1,  1382400, 0xf0eecdec
 0,       4584,       4584,        1,  1382400, 0x00000000
-0,       4586,       4586,        1,  1382400, 0x85547fd1
+0,       4586,       4586,        1,  1382400, 0x618b5b84
 0,       4645,       4645,        1,  1382400, 0x00000000
-0,       4648,       4648,        1,  1382400, 0x00000000
-0,       4648,       4648,        1,  1382400, 0xb6a8f181
+0,       4648,       4648,        1,  1382400, 0xaa6720f2
 0,       4715,       4715,        1,  1382400, 0x00000000
-0,       4717,       4717,        1,  1382400, 0xb64d1a2c
+0,       4717,       4717,        1,  1382400, 0x060bb700
 0,       4748,       4748,        1,  1382400, 0x00000000
-0,       4750,       4750,        1,  1382400, 0x7b37ecf3
+0,       4750,       4750,        1,  1382400, 0x2828be0e
 0,       4792,       4792,        1,  1382400, 0x00000000
-0,       4993,       4993,        1,  1382400, 0xdc025bd1
+0,       4993,       4993,        1,  1382400, 0xf8bbc093
 0,       5027,       5027,        1,  1382400, 0x00000000
-0,       5029,       5029,        1,  1382400, 0x688b294d
+0,       5029,       5029,        1,  1382400, 0x7b1bf22a
 0,       5068,       5068,        1,  1382400, 0x00000000
-0,       5070,       5070,        1,  1382400, 0xa2b33d1b
+0,       5070,       5070,        1,  1382400, 0xdd64d2bb
 0,       5117,       5117,        1,  1382400, 0x00000000
-0,       5119,       5119,        1,  1382400, 0xb3e525e3
+0,       5119,       5119,        1,  1382400, 0xd8e4cd86
 0,       5168,       5168,        1,  1382400, 0x00000000
-0,       5170,       5170,        1,  1382400, 0xaa8fbdd7
+0,       5170,       5170,        1,  1382400, 0x898b5977
 0,       5216,       5216,        1,  1382400, 0x00000000
-0,       5218,       5218,        1,  1382400, 0x7b7f26dd
+0,       5218,       5218,        1,  1382400, 0x7159b7a6
 0,       5249,       5249,        1,  1382400, 0x00000000
-0,       5251,       5251,        1,  1382400, 0x15e2f836
+0,       5251,       5251,        1,  1382400, 0x50104008
 0,       5289,       5289,        1,  1382400, 0x00000000
-0,       5291,       5291,        1,  1382400, 0x0fee9b0c
+0,       5291,       5291,        1,  1382400, 0x86540ec6
 0,       5358,       5358,        1,  1382400, 0x00000000
-0,       5360,       5360,        1,  1382400, 0x89d62791
+0,       5360,       5360,        1,  1382400, 0x274d1a46
 0,       5429,       5429,        1,  1382400, 0x00000000
-0,       5431,       5431,        1,  1382400, 0xa6a9fd74
+0,       5431,       5431,        1,  1382400, 0x5089f632
 0,       5490,       5490,        1,  1382400, 0x00000000
-0,       5491,       5491,        1,  1382400, 0x7896178d
+0,       5491,       5491,        1,  1382400, 0x6b89a314
 0,       5537,       5537,        1,  1382400, 0x00000000
-0,       5588,       5588,        1,  1382400, 0x01751a52
+0,       5588,       5588,        1,  1382400, 0x89fafd50
 0,       5647,       5647,        1,  1382400, 0x00000000
-0,       5688,       5688,        1,  1382400, 0xa3959c6f
+0,       5688,       5688,        1,  1382400, 0x25f2ada2
 0,       5770,       5770,        1,  1382400, 0x00000000
-0,       5772,       5772,        1,  1382400, 0x3d3ea47b
+0,       5772,       5772,        1,  1382400, 0x3574406f
 0,       5826,       5826,        1,  1382400, 0x00000000
-0,       5828,       5828,        1,  1382400, 0x593f8b24
+0,       5828,       5828,        1,  1382400, 0xb440b72a
 0,       5931,       5931,        1,  1382400, 0x00000000
-0,       5933,       5933,        1,  1382400, 0x171f05ba
+0,       5933,       5933,        1,  1382400, 0x80026884
 0,       6001,       6001,        1,  1382400, 0x00000000
-0,       6003,       6003,        1,  1382400, 0xb014cdf1
+0,       6003,       6003,        1,  1382400, 0xcf9efa64
 0,       6054,       6054,        1,  1382400, 0x00000000
-0,       6839,       6839,        1,  1382400, 0xd918e667
+0,       6839,       6839,        1,  1382400, 0xfeb611ad
 0,       6880,       6880,        1,  1382400, 0x00000000
-0,       7386,       7386,        1,  1382400, 0xc9406331
+0,       7386,       7386,        1,  1382400, 0x5e407233
 0,       7419,       7419,        1,  1382400, 0x00000000
-0,       7501,       7501,        1,  1382400, 0xaf08b10d
+0,       7501,       7501,        1,  1382400, 0xa924c3bd
 0,       7549,       7549,        1,  1382400, 0x00000000
-0,       7551,       7551,        1,  1382400, 0x00000000
-0,       7551,       7551,        1,  1382400, 0x853a9d93
+0,       7551,       7551,        1,  1382400, 0x5f9818b3
 0,       7589,       7589,        1,  1382400, 0x00000000
-0,       7605,       7605,        1,  1382400, 0x7491a87d
+0,       7605,       7605,        1,  1382400, 0x3299fcbd
 0,       7647,       7647,        1,  1382400, 0x00000000
-0,       7649,       7649,        1,  1382400, 0xf7383c58
+0,       7649,       7649,        1,  1382400, 0xe113824e
 0,       7697,       7697,        1,  1382400, 0x00000000
-0,       7699,       7699,        1,  1382400, 0xe66be411
+0,       7699,       7699,        1,  1382400, 0x85475a26
 0,       7743,       7743,        1,  1382400, 0x00000000
-0,       8032,       8032,        1,  1382400, 0xd6850362
+0,       8032,       8032,        1,  1382400, 0xb27eef40
 0,       8082,       8082,        1,  1382400, 0x00000000
-0,       8084,       8084,        1,  1382400, 0x3e1ed109
+0,       8084,       8084,        1,  1382400, 0x82590435
 0,       8115,       8115,        1,  1382400, 0x00000000
-0,       8116,       8116,        1,  1382400, 0x39c1b7bd
+0,       8116,       8116,        1,  1382400, 0x48179b41
 0,       8160,       8160,        1,  1382400, 0x00000000
-0,       8180,       8180,        1,  1382400, 0x35b85f2e
+0,       8180,       8180,        1,  1382400, 0x765378a3
 0,       8207,       8207,        1,  1382400, 0x00000000
-0,       8209,       8209,        1,  1382400, 0x00000000
-0,       8209,       8209,        1,  1382400, 0x83f103e5
+0,       8209,       8209,        1,  1382400, 0x2d4124d8
 0,       8247,       8247,        1,  1382400, 0x00000000
-0,       8249,       8249,        1,  1382400, 0xbc1ca9b3
+0,       8249,       8249,        1,  1382400, 0x9ca3f8c5
 0,       8278,       8278,        1,  1382400, 0x00000000
-0,       8281,       8281,        1,  1382400, 0x94d4a51e
+0,       8281,       8281,        1,  1382400, 0x46f3056d
 0,       8321,       8321,        1,  1382400, 0x00000000
-0,       8323,       8323,        1,  1382400, 0xf88cdfde
+0,       8323,       8323,        1,  1382400, 0xb8d19c43
 0,       8367,       8367,        1,  1382400, 0x00000000
-0,       8565,       8565,        1,  1382400, 0xdd51423b
+0,       8565,       8565,        1,  1382400, 0x06d4e160
 0,       8611,       8611,        1,  1382400, 0x00000000
-0,       8669,       8669,        1,  1382400, 0x08259fa4
+0,       8669,       8669,        1,  1382400, 0xd6e06132
 0,       8708,       8708,        1,  1382400, 0x00000000
-0,       8941,       8941,        1,  1382400, 0x1663fa34
+0,       8941,       8941,        1,  1382400, 0x44f7e37c
 0,       8994,       8994,        1,  1382400, 0x00000000
-0,       8996,       8996,        1,  1382400, 0xda2ceb55
-0,       9027,       9027,        1,  1382400, 0x00000000
+0,       8996,       8996,        1,  1382400, 0xa1f76b2f
diff --git a/tests/ref/fate/sub2video_time_limited b/tests/ref/fate/sub2video_time_limited
index 9fb6fb06f9..3aebce9ff1 100644
--- a/tests/ref/fate/sub2video_time_limited
+++ b/tests/ref/fate/sub2video_time_limited
@@ -2,7 +2,5 @@ 
 #media_type 0: video
 #codec_id 0: rawvideo
 #dimensions 0: 1920x1080
-#sar 0: 0/1
-0,          2,          2,        1,  8294400, 0x00000000
-0,          2,          2,        1,  8294400, 0xa87c518f
-0,         10,         10,        1,  8294400, 0xa87c518f
+#sar 0: 1/1
+0,          2,          2,        1,  8294400, 0x1c106cb0