[FFmpeg-user] Keeping A/V sync during telecine

[Carl Eugen Hoyos]

2017-12-30 3:46 GMT+01:00 Carl Zwanzig <cpz at tuunq.com>:

> Using a handy VOB, I did a conversion and created a pair of files of the
> first ~2 minutes. The lack of sync is quite apparent in the last 15 seconds.
>
> Original- https://www.dropbox.com/s/l4mw62oz62xbph3/tb-orig.mpg

The film intro is not stricly 24000/1001 frames, you can see this:
on the "drop" count in the status line
on the "29.97 fps" entry in the input section
(and on the mplayer status output)

Solution is to force the input framerate for the whole file:
-vf framerate=24000/1001,telecine
This will drop some frames in the intro, other solutions
may be possible.

Carl Eugen