[FFmpeg-devel] [RFC] Videos that change colorspace

[Michael Niedermayer]

On Thu, Jun 18, 2009 at 09:06:18AM -0700, Jason Garrett-Glaser wrote:
> On Thu, Jun 18, 2009 at 2:46 AM, Michael Niedermayer<michaelni at gmx.at> wrote:
> > On Wed, Jun 17, 2009 at 06:53:39PM -0700, Jason Garrett-Glaser wrote:
> >> Some quite popular camera is producing MJPEG videos that change
> >> colorspace: the first frame is YUVJ422P and all frames afterwards are
> >> YUVJ420P.
> >>
> >> This crashes ffmpeg (since swscale doesn't get re-initted after the
> >> video finding a new colorspace, and attempts to resample chroma that
> >> doesn't exist). ?It creates rather funky video in Virtualdub as well,
> >> but works perfectly in FFDshow+MPC on Windows.
> >>
> >> The relevant ticket can be found here:
> >> https://roundup.ffmpeg.org/roundup/ffmpeg/issue1165
> >>
> >> To give you an idea of how widespread this issue is, Facebook receives
> >> (my estimate based on grepping the logs) around one thousand of these
> >> files a day.
> >>
> >> How should we deal with this issue?
> >
> > same as with resolution changes ... theres a patch for the later that i
> > should review ...
> >
> > anyway, any idea why th cammera does that?
> 
> By the way, my local hacky solution is to track pix_fmt and re-init
> swscale if pix_fmt changes.

thats not too far from correct ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

> ... defining _GNU_SOURCE...
For the love of all that is holy, and some that is not, don't do that.
-- Luca & Mans
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