[FFmpeg-user] Please help with weird video problems

[Alexander Gribanov]

ср, 8 февр. 2023 г. в 02:11, Anatoly <anatoly at kazanfieldhockey.ru>:

> On Tue, 7 Feb 2023 22:00:35 +0300
> Alexander Gribanov <sunrisecoder at gmail.com> wrote:
>
> > Hello!
> >
> > Here is a downloaded Facebook Livestream video which I'm trying to
> > process:
> >
> https://drive.google.com/file/d/1mVkQbzVSzhOlQbT2mB1J2yvPFV5kl5Dq/view?usp=share_link
> >
> > I can play it correctly in MPC-HC Media Player Classic, but when I
> > try to add this video to Adobe Premiere 2022, there around 3:00:00
> > position audio is about 40 seconds ahead of video...
> >
> > I tried to remux and re-encode this video using ffmpeg, it showed a
> > lot of warnings like this:
> > [aac @ 000001c1bfe68e40] env_facs_q 254 is invalid
> >
> > I tried different options like "-vsync cfr", "-fps_mode drop" and some
> > other stuff which I don't remember already, but nothing helped :( In
> > MPC-HC it was ok, but in Adobe Premiere still 40-seconds a/v unsync.
> >
> > I assume that the problem is with timestamps on the audio track.
> >
> > I would like to make using ffmpeg just a simple cfr video 29.97 fps /
> > audio 48kHz without any timestamp gaps and offsets.
> >
> > Could anybody please help me to understand how to analyze and
> > diagnose such problems in such videos to be sure what the exact
> > problem is?
> >
> > Could You please help me find the solution (i.e. options or
> > subcommands to ffmpeg).
> >
> > Thank You very much in advance :)
>
> Maybe re-encode it with constant framerate using 'framerate' filter?
> ffmpeg -i in.mp4 -vf framerate=fps=29.97 -c:a copy -c:v libx264 -b:v
> 800k out.mp4
>

Hello Anatoly!
Thank You very much for the reply, but it didn't help, the problem remains
:(

Any other ideas?


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