diff --git a/libavcodec/assenc.c b/libavcodec/assenc.c
index a6e1d5d8b9..3decf670d7 100644
--- a/libavcodec/assenc.c
+++ b/libavcodec/assenc.c
@@ -27,10 +27,6 @@
 #include "libavutil/internal.h"
 #include "libavutil/mem.h"
 
-typedef struct {
-    int id; ///< current event id, ReadOrder field
-} ASSEncodeContext;
-
 static av_cold int ass_encode_init(AVCodecContext *avctx)
 {
     avctx->extradata = av_malloc(avctx->subtitle_header_size + 1);
@@ -46,49 +42,16 @@ static int ass_encode_frame(AVCodecContext *avctx,
                             unsigned char *buf, int bufsize,
                             const AVSubtitle *sub)
 {
-    ASSEncodeContext *s = avctx->priv_data;
     int i, len, total_len = 0;
 
     for (i=0; i<sub->num_rects; i++) {
-        char ass_line[2048];
         const char *ass = sub->rects[i]->ass;
-        long int layer;
-        char *p;
 
         if (sub->rects[i]->type != SUBTITLE_ASS) {
             av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
             return AVERROR(EINVAL);
         }
 
-#if FF_API_ASS_TIMING
-        if (!strncmp(ass, "Dialogue: ", 10)) {
-            if (i > 0) {
-                av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one "
-                       "ASS rectangle field.\n");
-                return AVERROR_INVALIDDATA;
-            }
-
-            ass += 10; // skip "Dialogue: "
-            /* parse Layer field. If it's a Marked field, the content
-             * will be "Marked=N" instead of the layer num, so we will
-             * have layer=0, which is fine. */
-            layer = strtol(ass, &p, 10);
-
-#define SKIP_ENTRY(ptr) do {        \
-    char *sep = strchr(ptr, ',');   \
-    if (sep)                        \
-        ptr = sep + 1;              \
-} while (0)
-
-            SKIP_ENTRY(p); // skip layer or marked
-            SKIP_ENTRY(p); // skip start timestamp
-            SKIP_ENTRY(p); // skip end timestamp
-            snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p);
-            ass_line[strcspn(ass_line, "\r\n")] = 0;
-            ass = ass_line;
-        }
-#endif
-
         len = av_strlcpy(buf+total_len, ass, bufsize-total_len);
 
         if (len > bufsize-total_len-1) {
@@ -110,7 +73,6 @@ AVCodec ff_ssa_encoder = {
     .id           = AV_CODEC_ID_ASS,
     .init         = ass_encode_init,
     .encode_sub   = ass_encode_frame,
-    .priv_data_size = sizeof(ASSEncodeContext),
 };
 #endif
 
@@ -122,6 +84,5 @@ AVCodec ff_ass_encoder = {
     .id           = AV_CODEC_ID_ASS,
     .init         = ass_encode_init,
     .encode_sub   = ass_encode_frame,
-    .priv_data_size = sizeof(ASSEncodeContext),
 };
 #endif
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 064af12f31..a3c8c425cb 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2047,9 +2047,6 @@ typedef struct AVCodecContext {
      */
     int sub_text_format;
 #define FF_SUB_TEXT_FMT_ASS              0
-#if FF_API_ASS_TIMING
-#define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
-#endif
 
     /**
      * Audio only. The amount of padding (in samples) appended by the encoder to
diff --git a/libavcodec/decode.c b/libavcodec/decode.c
index 0956a6ac6f..0078f00607 100644
--- a/libavcodec/decode.c
+++ b/libavcodec/decode.c
@@ -949,79 +949,6 @@ static int utf8_check(const uint8_t *str)
     return 1;
 }
 
-#if FF_API_ASS_TIMING
-static void insert_ts(AVBPrint *buf, int ts)
-{
-    if (ts == -1) {
-        av_bprintf(buf, "9:59:59.99,");
-    } else {
-        int h, m, s;
-
-        h = ts/360000;  ts -= 360000*h;
-        m = ts/  6000;  ts -=   6000*m;
-        s = ts/   100;  ts -=    100*s;
-        av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts);
-    }
-}
-
-static int convert_sub_to_old_ass_form(AVSubtitle *sub, const AVPacket *pkt, AVRational tb)
-{
-    int i;
-    AVBPrint buf;
-
-    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
-
-    for (i = 0; i < sub->num_rects; i++) {
-        char *final_dialog;
-        const char *dialog;
-        AVSubtitleRect *rect = sub->rects[i];
-        int ts_start, ts_duration = -1;
-        long int layer;
-
-        if (rect->type != SUBTITLE_ASS || !strncmp(rect->ass, "Dialogue: ", 10))
-            continue;
-
-        av_bprint_clear(&buf);
-
-        /* skip ReadOrder */
-        dialog = strchr(rect->ass, ',');
-        if (!dialog)
-            continue;
-        dialog++;
-
-        /* extract Layer or Marked */
-        layer = strtol(dialog, (char**)&dialog, 10);
-        if (*dialog != ',')
-            continue;
-        dialog++;
-
-        /* rescale timing to ASS time base (ms) */
-        ts_start = av_rescale_q(pkt->pts, tb, av_make_q(1, 100));
-        if (pkt->duration != -1)
-            ts_duration = av_rescale_q(pkt->duration, tb, av_make_q(1, 100));
-        sub->end_display_time = FFMAX(sub->end_display_time, 10 * ts_duration);
-
-        /* construct ASS (standalone file form with timestamps) string */
-        av_bprintf(&buf, "Dialogue: %ld,", layer);
-        insert_ts(&buf, ts_start);
-        insert_ts(&buf, ts_duration == -1 ? -1 : ts_start + ts_duration);
-        av_bprintf(&buf, "%s\r\n", dialog);
-
-        final_dialog = av_strdup(buf.str);
-        if (!av_bprint_is_complete(&buf) || !final_dialog) {
-            av_freep(&final_dialog);
-            av_bprint_finalize(&buf, NULL);
-            return AVERROR(ENOMEM);
-        }
-        av_freep(&rect->ass);
-        rect->ass = final_dialog;
-    }
-
-    av_bprint_finalize(&buf, NULL);
-    return 0;
-}
-#endif
-
 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
                              int *got_sub_ptr,
                              AVPacket *avpkt)
@@ -1057,17 +984,6 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
         av_assert1((ret >= 0) >= !!*got_sub_ptr &&
                    !!*got_sub_ptr >= !!sub->num_rects);
 
-#if FF_API_ASS_TIMING
-        if (avctx->sub_text_format == FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS
-            && *got_sub_ptr && sub->num_rects) {
-            const AVRational tb = avctx->pkt_timebase.num ? avctx->pkt_timebase
-                                  : avctx->time_base;
-            int err = convert_sub_to_old_ass_form(sub, avpkt, tb);
-            if (err < 0)
-                ret = err;
-        }
-#endif
-
         if (sub->num_rects && !sub->end_display_time && avpkt->duration &&
             avctx->pkt_timebase.num) {
             AVRational ms = { 1, 1000 };
diff --git a/libavcodec/movtextenc.c b/libavcodec/movtextenc.c
index cf30adbd0a..1b37d135e1 100644
--- a/libavcodec/movtextenc.c
+++ b/libavcodec/movtextenc.c
@@ -655,25 +655,12 @@ static int mov_text_encode_frame(AVCodecContext *avctx, unsigned char *buf,
             return AVERROR(EINVAL);
         }
 
-#if FF_API_ASS_TIMING
-        if (!strncmp(ass, "Dialogue: ", 10)) {
-            int num;
-            dialog = ff_ass_split_dialog(s->ass_ctx, ass, 0, &num);
-            for (; dialog && num--; dialog++) {
-                mov_text_dialog(s, dialog);
-                ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text);
-            }
-        } else {
-#endif
             dialog = ff_ass_split_dialog2(s->ass_ctx, ass);
             if (!dialog)
                 return AVERROR(ENOMEM);
             mov_text_dialog(s, dialog);
             ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text);
             ff_ass_free_dialog(&dialog);
-#if FF_API_ASS_TIMING
-        }
-#endif
 
         for (j = 0; j < box_count; j++) {
             box_types[j].encode(s);
diff --git a/libavcodec/options_table.h b/libavcodec/options_table.h
index 313150eb73..6ad54c2d67 100644
--- a/libavcodec/options_table.h
+++ b/libavcodec/options_table.h
@@ -366,15 +366,8 @@ static const AVOption avcodec_options[] = {
 {"auto",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_CHARENC_MODE_AUTOMATIC},   INT_MIN, INT_MAX, S|D, "sub_charenc_mode"},
 {"pre_decoder", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_CHARENC_MODE_PRE_DECODER}, INT_MIN, INT_MAX, S|D, "sub_charenc_mode"},
 {"ignore",      NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_CHARENC_MODE_IGNORE},      INT_MIN, INT_MAX, S|D, "sub_charenc_mode"},
-#if FF_API_ASS_TIMING
-{"sub_text_format", "set decoded text subtitle format", OFFSET(sub_text_format), AV_OPT_TYPE_INT, {.i64 = FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS}, 0, 1, S|D, "sub_text_format"},
-#else
 {"sub_text_format", "set decoded text subtitle format", OFFSET(sub_text_format), AV_OPT_TYPE_INT, {.i64 = FF_SUB_TEXT_FMT_ASS}, 0, 1, S|D, "sub_text_format"},
-#endif
 {"ass",              NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_TEXT_FMT_ASS},              INT_MIN, INT_MAX, S|D, "sub_text_format"},
-#if FF_API_ASS_TIMING
-{"ass_with_timings", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS}, INT_MIN, INT_MAX, S|D, "sub_text_format"},
-#endif
 #if FF_API_OLD_ENCDEC
 {"refcounted_frames", NULL, OFFSET(refcounted_frames), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, A|V|D },
 #endif
diff --git a/libavcodec/srtenc.c b/libavcodec/srtenc.c
index 655b65679e..160f3bbf3a 100644
--- a/libavcodec/srtenc.c
+++ b/libavcodec/srtenc.c
@@ -244,18 +244,6 @@ static int encode_frame(AVCodecContext *avctx,
             return AVERROR(EINVAL);
         }
 
-#if FF_API_ASS_TIMING
-        if (!strncmp(ass, "Dialogue: ", 10)) {
-            int num;
-            dialog = ff_ass_split_dialog(s->ass_ctx, ass, 0, &num);
-            for (; dialog && num--; dialog++) {
-                s->alignment_applied = 0;
-                if (avctx->codec_id == AV_CODEC_ID_SUBRIP)
-                    srt_style_apply(s, dialog->style);
-                ff_ass_split_override_codes(cb, s, dialog->text);
-            }
-        } else {
-#endif
             dialog = ff_ass_split_dialog2(s->ass_ctx, ass);
             if (!dialog)
                 return AVERROR(ENOMEM);
@@ -264,9 +252,6 @@ static int encode_frame(AVCodecContext *avctx,
                 srt_style_apply(s, dialog->style);
             ff_ass_split_override_codes(cb, s, dialog->text);
             ff_ass_free_dialog(&dialog);
-#if FF_API_ASS_TIMING
-        }
-#endif
     }
 
     if (!av_bprint_is_complete(&s->buffer))
diff --git a/libavcodec/ttmlenc.c b/libavcodec/ttmlenc.c
index 3972b4368c..c4964572f9 100644
--- a/libavcodec/ttmlenc.c
+++ b/libavcodec/ttmlenc.c
@@ -94,29 +94,6 @@ static int ttml_encode_frame(AVCodecContext *avctx, uint8_t *buf,
             return AVERROR(EINVAL);
         }
 
-#if FF_API_ASS_TIMING
-        if (!strncmp(ass, "Dialogue: ", 10)) {
-            int num;
-            dialog = ff_ass_split_dialog(s->ass_ctx, ass, 0, &num);
-
-            for (; dialog && num--; dialog++) {
-                int ret = ff_ass_split_override_codes(&ttml_callbacks, s,
-                                                      dialog->text);
-                int log_level = (ret != AVERROR_INVALIDDATA ||
-                                 avctx->err_recognition & AV_EF_EXPLODE) ?
-                                AV_LOG_ERROR : AV_LOG_WARNING;
-
-                if (ret < 0) {
-                    av_log(avctx, log_level,
-                           "Splitting received ASS dialog failed: %s\n",
-                           av_err2str(ret));
-
-                    if (log_level == AV_LOG_ERROR)
-                        return ret;
-                }
-            }
-        } else {
-#endif
             dialog = ff_ass_split_dialog2(s->ass_ctx, ass);
             if (!dialog)
                 return AVERROR(ENOMEM);
@@ -142,9 +119,6 @@ static int ttml_encode_frame(AVCodecContext *avctx, uint8_t *buf,
 
                 ff_ass_free_dialog(&dialog);
             }
-#if FF_API_ASS_TIMING
-        }
-#endif
     }
 
     if (!av_bprint_is_complete(&s->buffer))
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 0e20d5c2e2..af737afce1 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -63,9 +63,6 @@
 #ifndef FF_API_VBV_DELAY
 #define FF_API_VBV_DELAY         (LIBAVCODEC_VERSION_MAJOR < 59)
 #endif
-#ifndef FF_API_ASS_TIMING
-#define FF_API_ASS_TIMING       (LIBAVCODEC_VERSION_MAJOR < 59)
-#endif
 #ifndef FF_API_COPY_CONTEXT
 #define FF_API_COPY_CONTEXT     (LIBAVCODEC_VERSION_MAJOR < 59)
 #endif
diff --git a/libavcodec/webvttenc.c b/libavcodec/webvttenc.c
index febf6ee370..2419dd3d07 100644
--- a/libavcodec/webvttenc.c
+++ b/libavcodec/webvttenc.c
@@ -171,26 +171,12 @@ static int webvtt_encode_frame(AVCodecContext *avctx,
             return AVERROR(EINVAL);
         }
 
-#if FF_API_ASS_TIMING
-        if (!strncmp(ass, "Dialogue: ", 10)) {
-            int num;
-            dialog = ff_ass_split_dialog(s->ass_ctx, ass, 0, &num);
-            // TODO reindent
-        for (; dialog && num--; dialog++) {
-            webvtt_style_apply(s, dialog->style);
-            ff_ass_split_override_codes(&webvtt_callbacks, s, dialog->text);
-        }
-        } else {
-#endif
             dialog = ff_ass_split_dialog2(s->ass_ctx, ass);
             if (!dialog)
                 return AVERROR(ENOMEM);
             webvtt_style_apply(s, dialog->style);
             ff_ass_split_override_codes(&webvtt_callbacks, s, dialog->text);
             ff_ass_free_dialog(&dialog);
-#if FF_API_ASS_TIMING
-        }
-#endif
     }
 
     if (!av_bprint_is_complete(&s->buffer))
