[Bug 739334] GstGLVideoMixer input caps can not be dynamically changed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739334
  GStreamer | gst-plugins-bad | git

comicfans44 <comicfans44> changed:

           What    |Removed                     |Added
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                 CC|                            |comicfans44 at gmail.com

--- Comment #4 from comicfans44 <comicfans44 at gmail.com> 2014-11-03 02:29:35 UTC ---
(In reply to comment #3)
> commit 76dfda2bcf4fe9917402b6c42ab968802bc55c5e
> Author: Matthew Waters <matthew at centricular.com>
> Date:   Fri Oct 31 12:52:07 2014 +1100
> 
>     glmixer: advertise support for changing input caps mid-stream
> 
>     https://bugzilla.gnome.org/show_bug.cgi?id=739334

this fix the problem when upstream's caps is system memory based ,
but when upstream is gl element, this leads negotiated result caps 
fallback to system memory. 

gst_gl_mixer_update_caps didn't remove width/height from 
current used srccaps's GLMemory caps (but makes System Memory part accept any
width/height), so new width/height GLMemory caps not work, but fallback 
to SystemMemory

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