diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index ba82b7490d..69bd23f576 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -322,8 +322,6 @@ typedef struct FilterGraph {
     const AVClass *class;
     int            index;
 
-    AVFilterGraph *graph;
-
     InputFilter   **inputs;
     int          nb_inputs;
     OutputFilter **outputs;
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index ada235b084..3b0d457cc2 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -80,6 +80,8 @@ static const FilterGraphPriv *cfgp_from_cfg(const FilterGraph *fg)
 
 // data that is local to the filter thread and not visible outside of it
 typedef struct FilterGraphThread {
+    AVFilterGraph *graph;
+
     AVFrame *frame;
 
     // Temporary buffer for output frames, since on filtergraph reset
@@ -850,7 +852,6 @@ void fg_free(FilterGraph **pfg)
         return;
     fgp = fgp_from_fg(fg);
 
-    avfilter_graph_free(&fg->graph);
     for (int j = 0; j < fg->nb_inputs; j++) {
         InputFilter *ifilter = fg->inputs[j];
         InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
@@ -1213,7 +1214,8 @@ static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
     return 0;
 }
 
-static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
+static int configure_output_video_filter(FilterGraph *fg, AVFilterGraph *graph,
+                                         OutputFilter *ofilter, AVFilterInOut *out)
 {
     OutputFilterPriv *ofp = ofp_from_ofilter(ofilter);
     OutputStream *ost = ofilter->ost;
@@ -1228,7 +1230,7 @@ static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter,
     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
     ret = avfilter_graph_create_filter(&ofp->filter,
                                        avfilter_get_by_name("buffersink"),
-                                       name, NULL, NULL, fg->graph);
+                                       name, NULL, NULL, graph);
 
     if (ret < 0)
         return ret;
@@ -1248,7 +1250,7 @@ static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter,
         snprintf(name, sizeof(name), "scaler_out_%d_%d",
                  ost->file_index, ost->index);
         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
-                                                name, args, NULL, fg->graph)) < 0)
+                                                name, args, NULL, graph)) < 0)
             return ret;
         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
             return ret;
@@ -1267,7 +1269,7 @@ static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter,
 
         ret = avfilter_graph_create_filter(&filter,
                                            avfilter_get_by_name("format"),
-                                           "format", pix_fmts, NULL, fg->graph);
+                                           "format", pix_fmts, NULL, graph);
         av_bprint_finalize(&bprint, NULL);
         if (ret < 0)
             return ret;
@@ -1292,7 +1294,8 @@ static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter,
     return 0;
 }
 
-static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
+static int configure_output_audio_filter(FilterGraph *fg, AVFilterGraph *graph,
+                                         OutputFilter *ofilter, AVFilterInOut *out)
 {
     OutputFilterPriv *ofp = ofp_from_ofilter(ofilter);
     OutputStream *ost = ofilter->ost;
@@ -1306,7 +1309,7 @@ static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
     ret = avfilter_graph_create_filter(&ofp->filter,
                                        avfilter_get_by_name("abuffersink"),
-                                       name, NULL, NULL, fg->graph);
+                                       name, NULL, NULL, graph);
     if (ret < 0)
         return ret;
     if ((ret = av_opt_set_int(ofp->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
@@ -1320,7 +1323,7 @@ static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
                                                                             \
     ret = avfilter_graph_create_filter(&filt_ctx,                           \
                                        avfilter_get_by_name(filter_name),   \
-                                       filter_name, arg, NULL, fg->graph);  \
+                                       filter_name, arg, NULL, graph);      \
     if (ret < 0)                                                            \
         goto fail;                                                          \
                                                                             \
@@ -1361,7 +1364,7 @@ static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
                  ost->file_index, ost->index);
         ret = avfilter_graph_create_filter(&format,
                                            avfilter_get_by_name("aformat"),
-                                           name, args.str, NULL, fg->graph);
+                                           name, args.str, NULL, graph);
         if (ret < 0)
             goto fail;
 
@@ -1400,8 +1403,8 @@ fail:
     return ret;
 }
 
-static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter,
-                                   AVFilterInOut *out)
+static int configure_output_filter(FilterGraph *fg, AVFilterGraph *graph,
+                                   OutputFilter *ofilter, AVFilterInOut *out)
 {
     if (!ofilter->ost) {
         av_log(fg, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
@@ -1409,8 +1412,8 @@ 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_VIDEO: return configure_output_video_filter(fg, graph, ofilter, out);
+    case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, graph, ofilter, out);
     default: av_assert0(0); return 0;
     }
 }
@@ -1444,8 +1447,8 @@ static void sub2video_prepare(InputFilterPriv *ifp)
     ifp->sub2video.initialize = 1;
 }
 
-static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
-                                        AVFilterInOut *in)
+static int configure_input_video_filter(FilterGraph *fg, AVFilterGraph *graph,
+                                        InputFilter *ifilter, AVFilterInOut *in)
 {
     InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
 
@@ -1498,7 +1501,7 @@ static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 
 
     if ((ret = avfilter_graph_create_filter(&ifp->filter, buffer_filt, name,
-                                            args.str, NULL, fg->graph)) < 0)
+                                            args.str, NULL, graph)) < 0)
         goto fail;
     par->hw_frames_ctx = ifp->hw_frames_ctx;
     ret = av_buffersrc_parameters_set(ifp->filter, par);
@@ -1574,8 +1577,8 @@ fail:
     return ret;
 }
 
-static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
-                                        AVFilterInOut *in)
+static int configure_input_audio_filter(FilterGraph *fg, AVFilterGraph *graph,
+                                        InputFilter *ifilter, AVFilterInOut *in)
 {
     InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
     AVFilterContext *last_filter;
@@ -1610,7 +1613,7 @@ static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 
     if ((ret = avfilter_graph_create_filter(&ifp->filter, abuffer_filt,
                                             name, args.str, NULL,
-                                            fg->graph)) < 0)
+                                            graph)) < 0)
         return ret;
     last_filter = ifp->filter;
 
@@ -1633,24 +1636,24 @@ static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
     return 0;
 }
 
-static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
-                                  AVFilterInOut *in)
+static int configure_input_filter(FilterGraph *fg, AVFilterGraph *graph,
+                                  InputFilter *ifilter, AVFilterInOut *in)
 {
     switch (ifp_from_ifilter(ifilter)->type) {
-    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_VIDEO: return configure_input_video_filter(fg, graph, ifilter, in);
+    case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, graph, ifilter, in);
     default: av_assert0(0); return 0;
     }
 }
 
-static void cleanup_filtergraph(FilterGraph *fg)
+static void cleanup_filtergraph(FilterGraph *fg, FilterGraphThread *fgt)
 {
     int i;
     for (i = 0; i < fg->nb_outputs; i++)
         ofp_from_ofilter(fg->outputs[i])->filter = NULL;
     for (i = 0; i < fg->nb_inputs; i++)
         ifp_from_ifilter(fg->inputs[i])->filter = NULL;
-    avfilter_graph_free(&fg->graph);
+    avfilter_graph_free(&fgt->graph);
 }
 
 static int filter_is_buffersrc(const AVFilterContext *f)
@@ -1677,9 +1680,9 @@ static int graph_is_meta(AVFilterGraph *graph)
     return 1;
 }
 
-static int sub2video_frame(InputFilter *ifilter, AVFrame *frame);
+static int sub2video_frame(InputFilter *ifilter, AVFrame *frame, int buffer);
 
-static int configure_filtergraph(FilterGraph *fg, const FilterGraphThread *fgt)
+static int configure_filtergraph(FilterGraph *fg, FilterGraphThread *fgt)
 {
     FilterGraphPriv *fgp = fgp_from_fg(fg);
     AVBufferRef *hw_device;
@@ -1688,27 +1691,28 @@ static int configure_filtergraph(FilterGraph *fg, const FilterGraphThread *fgt)
     int have_input_eof = 0;
     const char *graph_desc = fgp->graph_desc;
 
-    cleanup_filtergraph(fg);
-    if (!(fg->graph = avfilter_graph_alloc()))
+    cleanup_filtergraph(fg, fgt);
+    fgt->graph = avfilter_graph_alloc();
+    if (!fgt->graph)
         return AVERROR(ENOMEM);
 
     if (simple) {
         OutputStream *ost = fg->outputs[0]->ost;
 
         if (filter_nbthreads) {
-            ret = av_opt_set(fg->graph, "threads", filter_nbthreads, 0);
+            ret = av_opt_set(fgt->graph, "threads", filter_nbthreads, 0);
             if (ret < 0)
                 goto fail;
         } else {
             const AVDictionaryEntry *e = NULL;
             e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
             if (e)
-                av_opt_set(fg->graph, "threads", e->value, 0);
+                av_opt_set(fgt->graph, "threads", e->value, 0);
         }
 
         if (av_dict_count(ost->sws_dict)) {
             ret = av_dict_get_string(ost->sws_dict,
-                                     &fg->graph->scale_sws_opts,
+                                     &fgt->graph->scale_sws_opts,
                                      '=', ':');
             if (ret < 0)
                 goto fail;
@@ -1719,20 +1723,20 @@ static int configure_filtergraph(FilterGraph *fg, const FilterGraphThread *fgt)
             ret = av_dict_get_string(ost->swr_opts, &args, '=', ':');
             if (ret < 0)
                 goto fail;
-            av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
+            av_opt_set(fgt->graph, "aresample_swr_opts", args, 0);
             av_free(args);
         }
     } else {
-        fg->graph->nb_threads = filter_complex_nbthreads;
+        fgt->graph->nb_threads = filter_complex_nbthreads;
     }
 
     hw_device = hw_device_for_filter();
 
-    if ((ret = graph_parse(fg->graph, graph_desc, &inputs, &outputs, hw_device)) < 0)
+    if ((ret = graph_parse(fgt->graph, graph_desc, &inputs, &outputs, hw_device)) < 0)
         goto fail;
 
     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
-        if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
+        if ((ret = configure_input_filter(fg, fgt->graph, fg->inputs[i], cur)) < 0) {
             avfilter_inout_free(&inputs);
             avfilter_inout_free(&outputs);
             goto fail;
@@ -1740,7 +1744,7 @@ static int configure_filtergraph(FilterGraph *fg, const FilterGraphThread *fgt)
     avfilter_inout_free(&inputs);
 
     for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
-        ret = configure_output_filter(fg, fg->outputs[i], cur);
+        ret = configure_output_filter(fg, fgt->graph, fg->outputs[i], cur);
         if (ret < 0) {
             avfilter_inout_free(&outputs);
             goto fail;
@@ -1749,11 +1753,11 @@ static int configure_filtergraph(FilterGraph *fg, const FilterGraphThread *fgt)
     avfilter_inout_free(&outputs);
 
     if (fgp->disable_conversions)
-        avfilter_graph_set_auto_convert(fg->graph, AVFILTER_AUTO_CONVERT_NONE);
-    if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
+        avfilter_graph_set_auto_convert(fgt->graph, AVFILTER_AUTO_CONVERT_NONE);
+    if ((ret = avfilter_graph_config(fgt->graph, NULL)) < 0)
         goto fail;
 
-    fgp->is_meta = graph_is_meta(fg->graph);
+    fgp->is_meta = graph_is_meta(fgt->graph);
 
     /* limit the lists of allowed formats to the ones selected, to
      * make sure they stay the same if the filtergraph is reconfigured later */
@@ -1791,7 +1795,7 @@ static int configure_filtergraph(FilterGraph *fg, const FilterGraphThread *fgt)
         AVFrame *tmp;
         while (av_fifo_read(ifp->frame_queue, &tmp, 1) >= 0) {
             if (ifp->type_src == AVMEDIA_TYPE_SUBTITLE) {
-                sub2video_frame(&ifp->ifilter, tmp);
+                sub2video_frame(&ifp->ifilter, tmp, !fgt->graph);
             } else {
                 ret = av_buffersrc_add_frame(ifp->filter, tmp);
             }
@@ -1814,14 +1818,14 @@ static int configure_filtergraph(FilterGraph *fg, const FilterGraphThread *fgt)
 
     if (have_input_eof) {
         // make sure the EOF propagates to the end of the graph
-        ret = avfilter_graph_request_oldest(fg->graph);
+        ret = avfilter_graph_request_oldest(fgt->graph);
         if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
             goto fail;
     }
 
     return 0;
 fail:
-    cleanup_filtergraph(fg);
+    cleanup_filtergraph(fg, fgt);
     return ret;
 }
 
@@ -1894,17 +1898,18 @@ int filtergraph_is_simple(const FilterGraph *fg)
     return fgp->is_simple;
 }
 
-static void send_command(FilterGraph *fg, double time, const char *target,
+static void send_command(FilterGraph *fg, AVFilterGraph *graph,
+                         double time, const char *target,
                          const char *command, const char *arg, int all_filters)
 {
     int ret;
 
-    if (!fg->graph)
+    if (!graph)
         return;
 
     if (time < 0) {
         char response[4096];
-        ret = avfilter_graph_send_command(fg->graph, target, command, arg,
+        ret = avfilter_graph_send_command(graph, target, command, arg,
                                           response, sizeof(response),
                                           all_filters ? 0 : AVFILTER_CMD_FLAG_ONE);
         fprintf(stderr, "Command reply for stream %d: ret:%d res:\n%s",
@@ -1912,7 +1917,7 @@ static void send_command(FilterGraph *fg, double time, const char *target,
     } else if (!all_filters) {
         fprintf(stderr, "Queuing commands only on filters supporting the specific command is unsupported\n");
     } else {
-        ret = avfilter_graph_queue_command(fg->graph, target, command, arg, 0, time);
+        ret = avfilter_graph_queue_command(graph, target, command, arg, 0, time);
         if (ret < 0)
             fprintf(stderr, "Queuing command failed with error %s\n", av_err2str(ret));
     }
@@ -2396,7 +2401,7 @@ static int read_frames(FilterGraph *fg, FilterGraphThread *fgt,
     int did_step = 0;
 
     // graph not configured, just select the input to request
-    if (!fg->graph) {
+    if (!fgt->graph) {
         for (int i = 0; i < fg->nb_inputs; i++) {
             InputFilterPriv *ifp = ifp_from_ifilter(fg->inputs[i]);
             if (ifp->format < 0 && !fgt->eof_in[i]) {
@@ -2415,7 +2420,7 @@ static int read_frames(FilterGraph *fg, FilterGraphThread *fgt,
     while (fgp->nb_outputs_done < fg->nb_outputs) {
         int ret;
 
-        ret = avfilter_graph_request_oldest(fg->graph);
+        ret = avfilter_graph_request_oldest(fgt->graph);
         if (ret == AVERROR(EAGAIN)) {
             fgt->next_in = choose_input(fg, fgt);
             break;
@@ -2473,12 +2478,12 @@ static void sub2video_heartbeat(InputFilter *ifilter, int64_t pts, AVRational tb
         sub2video_push_ref(ifp, pts2);
 }
 
-static int sub2video_frame(InputFilter *ifilter, AVFrame *frame)
+static int sub2video_frame(InputFilter *ifilter, AVFrame *frame, int buffer)
 {
     InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
     int ret;
 
-    if (!ifilter->graph->graph) {
+    if (buffer) {
         AVFrame *tmp;
 
         if (!frame)
@@ -2593,7 +2598,7 @@ static int send_frame(FilterGraph *fg, FilterGraphThread *fgt,
         break;
     }
 
-    if (!ifp->ist->reinit_filters && fg->graph)
+    if (!ifp->ist->reinit_filters && fgt->graph)
         need_reinit = 0;
 
     if (!!ifp->hw_frames_ctx != !!frame->hw_frames_ctx ||
@@ -2614,7 +2619,7 @@ static int send_frame(FilterGraph *fg, FilterGraphThread *fgt,
     }
 
     /* (re)init the graph if possible, otherwise buffer the frame and return */
-    if (need_reinit || !fg->graph) {
+    if (need_reinit || !fgt->graph) {
         AVFrame *tmp = av_frame_alloc();
 
         if (!tmp)
@@ -2630,7 +2635,7 @@ static int send_frame(FilterGraph *fg, FilterGraphThread *fgt,
             return ret;
         }
 
-        ret = fg->graph ? read_frames(fg, fgt, tmp) : 0;
+        ret = fgt->graph ? read_frames(fg, fgt, tmp) : 0;
         av_frame_free(&tmp);
         if (ret < 0)
             return ret;
@@ -2691,6 +2696,8 @@ static void fg_thread_uninit(FilterGraphThread *fgt)
     av_freep(&fgt->eof_in);
     av_freep(&fgt->eof_out);
 
+    avfilter_graph_free(&fgt->graph);
+
     memset(fgt, 0, sizeof(*fgt));
 }
 
@@ -2774,7 +2781,7 @@ static void *filter_thread(void *arg)
             av_assert0(o == FRAME_OPAQUE_SEND_COMMAND && fgt.frame->buf[0]);
 
             fc = (FilterCommand*)fgt.frame->buf[0]->data;
-            send_command(fg, fc->time, fc->target, fc->command, fc->arg,
+            send_command(fg, fgt.graph, fc->time, fc->target, fc->command, fc->arg,
                          fc->all_filters);
             av_frame_unref(fgt.frame);
             continue;
@@ -2786,7 +2793,8 @@ static void *filter_thread(void *arg)
 
         if (ifp->type_src == AVMEDIA_TYPE_SUBTITLE) {
             int hb_frame = input_status >= 0 && o == FRAME_OPAQUE_SUB_HEARTBEAT;
-            ret = sub2video_frame(ifilter, (fgt.frame->buf[0] || hb_frame) ? fgt.frame : NULL);
+            ret = sub2video_frame(ifilter, (fgt.frame->buf[0] || hb_frame) ? fgt.frame : NULL,
+                                  !fgt.graph);
         } else if (fgt.frame->buf[0]) {
             ret = send_frame(fg, &fgt, ifilter, fgt.frame);
         } else {
