[FFmpeg-user] Is there a reason the default vsync for the mp4 muxer is not 2?

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed May 23 16:51:38 EEST 2018

2018-05-23 15:39 GMT+02:00, André Hänsel <andre at webkr.de>:
> I added -vsync 2 to the command line options and I got a file
> that has roughly the same number of frames as the input.

But it is - unfortunately! - an invalid file.

> I think this would make much more sense as a default. The
> documentation says about the default for vsync:
>> Chooses between 1 and 2 depending on muxer capabilities.
> So first question: Is there a reason why the mp4 muxer
> cannot choose vsync 2?

Because our mov muxer does not support vfr (correctly).

Carl Eugen

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