#11554: ffmpeg does not respect A/V start_pts in the input file while
transcoding
to HLS/fmp4, the output has A/V sync issue
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Reporter: weihuaqd | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version: 7.1
Keywords: fmp4 start_pts | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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I have some webcam recordings with different A/V start_pts. For the
attached sample file, the video start_pts is 0, the audio start_pts is
55632 (1.159 seconds). Here's the command I used to transcode:
{{{
ffmpeg.exe -v 9 -loglevel 99 -i webcam_recording_original.mp4 -y
-hls_segment_filename segment-%d.m4s -hls_playlist_type vod
-hls_segment_type fmp4 -hls_time 10 -hls_list_size 0 -bf 0 test.m3u8
}}}
The output file has both A/V start_pts set to 0. These cause the A/V
desync - the audio is 1.159 seconds ahead of the video. This only affects
fmp4 segment type. The ts segment type is fine.
I have tried asetpts and other options, and they did not have any effect.
This affects v6.* and v7.*.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11554>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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