[libav-bugs] [Bug 321] Converting MJPG to mp4 with avconv leads to bad quality video

bugzilla-daemon at aruru.libav.org bugzilla-daemon at aruru.libav.org
Thu Jul 5 12:26:41 CEST 2012


https://bugzilla.libav.org/show_bug.cgi?id=321

--- Comment #4 from Anton Khirnov <anton at khirnov.net> 2012-07-05 12:26:41 CEST ---
(In reply to comment #3)
> Does it happen with all vobs or just one? Does changing the seek time
> have any influence on it?
> 
> As a temporary workaround you can use -ss as an output option (move it
> before the output filename), which will be slower (since avconv will
> decode everything), but should work more reliably.
> 
> Also note that -t is strictly an output option, specifying it as an
> input option has no effect (i hope to fix the options parser so it
> prints an error in such a case soon).

Aw crap, replied to the wrong bug. Sorry about the noise.

What I wanted to write here was:

I see the encoder that gets used is mpeg4 and you're not supplying any
video encoding options. This mean that defaults get used and those are
pretty horrible. This is arguably a bug and should most certainly be
fixed, but it's been that way since forever.

So my guess would be that your previous version was compiled with
libx264 and your current one is not for whatever reason. The solution is
to rebuild your avconv with libx264. Then it should be selected
automatically and its default settings are quite reasonable.

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