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Title: problem with changing fps during compression
Post by: eltomassito on March 05, 2016, 07:31:55 AM

I found bug in avidemux. If you try to recompress video other then 25fps with avidemux then fps in destination material is incorrect, i.e.:
23.976 -> 23.711
24.000 -> 23.255
29.970 -> 29.637
30.000 -> 29.670
59.940 -> 59.618
60.000 -> 59.052
And as a result audio desynchronization occurs.
Problem is applied to mp4v2 muxer. mp4 muxer seems to work ok (only one per six destination file had spoiled fps during my tests)

Title: Re: problem with changing fps during compression
Post by: Jan Gruuthuse on March 05, 2016, 09:52:28 AM

Your used version of avidemux and its source?
Used Video Output, other then copy?

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Title: Re: problem with changing fps during compression
Post by: eltomassito on March 06, 2016, 10:54:18 AM

Version 2.6.11. But I've tested older versions too. x32 and x64 versions. I've tried to recompress video and destination video had spoiled framerate too.

Title: Re: problem with changing fps during compression
Post by: mean on March 06, 2016, 11:10:46 AM

mp4v2 is not very tolerant regarding timing

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Avidemux => Main version 2.6 => Topic started by: eltomassito on March 05, 2016, 07:31:55 AM