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Old 29th July 2018, 00:31   #96  |  Link
manolito
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Join Date: Sep 2003
Location: Berlin, Germany
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Quote:
Originally Posted by bradwiggo View Post
You are correct, it is from iTunes. How were you able to tell, are the VFR issues common with apple?

Do you need to convert it to CFR before interpolation?
I have no idea if those VFR issues are common with Apple, I hate Apple and don't use any of their stuff...

The MP4 seems to be peculiar, though. MediaInfo says this about the frame rate:
Quote:
Frame rate mode : variabel
Frame rate : 23,976 FPS
Minimum frame rate : 23,077 FPS
Maximum frame rate : 24,000 FPS
I need to use CFR for my videos because AviSynth is always involved in my conversions, and AviSynth does not understand VFR. Converting the source to CFR is usually done by the source filter (DSS2Mod or FFmpegSource in my case), but for this source I always end up with messed up audio sync.

I also noticed that when I play back the file from within One-Drive with the latest Chrome browser the audio sync is also broken.

I did finally discover a method to fix this issue. First I needed to repack the source to MKV with mkvmerge. This already changed the fps to CFR. When I then used FFmegSource as the source filter for video and audio I got perfect audio sync. DSS2Mod did not work.


Cheers
manolito
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