[FFmpeg-devel] [PATCH 1/2] libavformat/mxfenc.c: Fix segfault when writing an audio packet when there has not been a video one.

Tomas Härdin tomas.hardin at codemill.se
Mon Oct 19 23:30:15 CEST 2015

On Mon, 2015-10-19 at 11:40 +0200, Alexis Ballier wrote:
> On Mon, 19 Oct 2015 10:30:00 +0200
> Michael Niedermayer <michael at niedermayer.cc> wrote:
> > On Fri, Oct 16, 2015 at 10:42:32AM +0200, Alexis Ballier wrote:
> > > This happens when writing the trailer of a file containing audio
> > > but that has not muxed any video packet. Fixes ticket #4817.
> > > 
> > > ----  
> > 
> > from IRC:
> > <thardin> maybe it should print a warning that there has been no
> > video?
> maybe, but what would be the right condition ? just this case ? or when
> writing any edit unit without video? or... ?
> I haven't been able to find clear references on this (well, those smpte
> specs I googled aren't esp. easy to read either), but e.g. the muxer
> refuses to mux without exactly one video stream, so maybe, an empty
> video stream is also an error; I don't know

I'm not particularly fond of second-guessing these kinds of things. D-10
is really anal about what constitutes a legal file, so it's probably
best not to write anything if something seems amiss. In the end, the
real test for correctness is whether the output works with all gear for
your particular use case. But segfaults are important to fix, so I'm not
too concerned here. Plus my main concern is mxfdec, not mxfenc.

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