Right now, the code check for no filter description, but if we use a
filter_complex, the code will use the AVFrame.duration which could be
wrong in case of using fps filter.
How to reproduce the problem:
ffmpeg -f lavfi -i testsrc=duration=1 -vf fps=fps=50 -vsync 1 -f null -
output 50 frames
ffmpeg -f lavfi -i testsrc=duration=1 -filter_complex fps=fps=50 -vsync 1 -f
null -
output 51 frames
With the patch, the same command will always output 50 frames.
---
fftools/ffmpeg.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index 544f1a1cef..0f157d67d8 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -1079,6 +1079,7 @@ static void do_video_out(OutputFile *of,
if (!ost->filters_script &&
!ost->filters &&
+ (nb_filtergraphs == 0 || !filtergraphs[0]->graph_desc) &&
next_picture &&
ist &&
lrintf(next_picture->pkt_duration * av_q2d(ist->st->time_base) /
av_q2d(enc->time_base)) > 0) {
--
2.21.0.392.gf8f6787159e-goog
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