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-rw-r--r--fftools/ffmpeg.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index 8e6206647f..3ad11452da 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -3144,7 +3144,11 @@ static int init_output_stream_streamcopy(OutputStream *ost)
if (!ost->frame_rate.num)
ost->frame_rate = ist->framerate;
- ost->st->avg_frame_rate = ost->frame_rate;
+
+ if (ost->frame_rate.num)
+ ost->st->avg_frame_rate = ost->frame_rate;
+ else
+ ost->st->avg_frame_rate = ist->st->avg_frame_rate;
ret = avformat_transfer_internal_stream_timing_info(of->ctx->oformat, ost->st, ist->st, copy_tb);
if (ret < 0)