@@ -895,6 +895,7 @@ static void do_video_out(AVFormatContext *s,

     double duration = 0;

     int frame_size = 0;

     InputStream *ist = NULL;

+    AVFilterContext *filter = ost->filter->filter;

     if (ost->source_index >= 0)

         ist = input_streams[ost->source_index];

@@ -902,6 +903,13 @@ static void do_video_out(AVFormatContext *s,

     if(ist && ist->st->start_time != AV_NOPTS_VALUE && ist->st->first_dts != AV_NOPTS_VALUE && ost->frame_rate.num)

         duration = 1/(av_q2d(ost->frame_rate) * av_q2d(enc->time_base));

+    // We take the conservative approuch here and take the minimum even though

+    // this should be correct on its own but a value too small is harmless, one

+    // too big can lead to errors

+    if (filter->inputs[0]->frame_rate.num > 0 &&

+        filter->inputs[0]->frame_rate.den > 0)

+        duration = FFMIN(duration, 1/(av_q2d(filter->inputs[0]->frame_rate) * av_q2d(enc->time_base)));

+

     if (!ost->filters_script &&

         !ost->filters &&

         next_picture &&