[Bug 756288] avenc_jpeg2000 and avdec_jpeg2000 can't negotiate caps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756288

--- Comment #5 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
(In reply to Amomum from comment #2)
> Thiago, I believe you are wrong.
> 
> Bug you marked as duplicate is said to be fixed in libav commit
> cbc808d726afdf53d866264722785c1304c17390.
> 
> The only change I can see there is in file jpeg2000dec.c:
>     if (ncomponents > 3) {
> 
> became 
> 
>     if (ncomponents > 4) {
> 
> in function static int get_siz(Jpeg2000DecoderContext *s).
> 
> That was in 2014; that fix is present in libav 10.7 and in
> gst-libav-1.6.0.tar.xz from which I built gst-libav plugins.
> 
> And I honestly don't understand how that fix can be related to gstreamer
> caps.
> 
> Please, correct me if I'm wrong; my understanding of gstreamer and libav
> source structure is very poor.

The fix in libav was for some issue in JPEG2000 decoding, there is a patch in
the bug I mentioned that adds the proper mapping of caps to gst-libav (that is
the gstreamer plugin for libav/ffmpeg) and that makes your pipeline work. You
can try applying it and checking if it works for you.

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