[Bug 742924] decodebin: Initial decoder negotiation will always fail

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742924

Mathieu Duponchelle <mduponchelle1 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |mduponchelle1 at gmail.com

--- Comment #5 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Easy way to show the issue :

GST_DEBUG=*videodecoder*:5 gst-launch-1.0 filesrc
location=/home/meh/Videos/screw.mp4 ! qtdemux ! h264parse ! vaapidecode !
glimagesink 2>&1 | grep "ALLOCATION"

The negotiation is immediately done to system memory

GST_DEBUG=*videodecoder*:5 gst-launch-1.0 uridecodebin
uri=file:///home/meh/Videos/screw.mp4 ! glimagesink 2>&1 | grep "ALLOCATION"

The first negotiated caps have the VASurface feature, even though glimagesink
can't handle that.

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