Open radpopl opened 2 weeks ago
I have an audio problem with a 4h MP4 file (H265 VFR + AAC) from a standalone recorder.
I open it in MPC-HC and at 4:00:59.500 I have synchronized video and audio. It looks and sounds OK. VLC too.
I open it in AviSynth using LWLibavVideoCodec:
name1="VFR.mp4" a=AudioDub(LWLibavVideoSource(name1,fpsnum=50),LWLibavAudioSource(name1)) return a
And here is the problem, because the audio track is sped up and what was in 4:00:59.500 moves to approx. 4:00:49.180 In ffms2 it is the same.
(This is not a linear shift, because at time 0:13:00.000 I have only 1 frame of shift.)
If, however, in VirtualDub, load the same MP4 file as an audio track (Audio->Audio from another file), everything is perfectly synchronized.
Discussion: https://forum.doom9.org/showthread.php?p=2006887
I have an audio problem with a 4h MP4 file (H265 VFR + AAC) from a standalone recorder.
I open it in MPC-HC and at 4:00:59.500 I have synchronized video and audio. It looks and sounds OK. VLC too.
I open it in AviSynth using LWLibavVideoCodec:
And here is the problem, because the audio track is sped up and what was in 4:00:59.500 moves to approx. 4:00:49.180 In ffms2 it is the same.
(This is not a linear shift, because at time 0:13:00.000 I have only 1 frame of shift.)
If, however, in VirtualDub, load the same MP4 file as an audio track (Audio->Audio from another file), everything is perfectly synchronized.