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

[Carl Eugen Hoyos]

2017-12-30 13:59 GMT+01:00 Carl Eugen Hoyos <ceffmpeg at gmail.com>:
> 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

Should have been: -vf fps=24000/1001,telecine

> This will drop some frames in the intro, other solutions
> may be possible.

This is true for the fps filter.
The framerate filter may be the more advanced solution.

Carl Eugen