[Bug 767699] decodebin/vaapi: regression: linking with autovideosink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767699

--- Comment #2 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Two problems here:

1\ Autovideosink chooses first vaapisink, but it ditches it because the caps
template of vaapisink doesn't match with video/x-raw (!!!!)

2\ Autovideosink then chooses, in my setup, ximagesink, but it cannot be linked
because decodebin (with vaapi) set the src caps as
video/x-raw(memory:VASurface), format=NV12 which is not handled by ximagesink

Workarounds:

gst-launch-1.0 filesrc location=example.mp4 ! decodebin !
{videoconvert,vaapipostproc} ! autovideosink

gst-launch-1.0 filesrc location=example.mp4 ! decodebin ! autovideosink
filter-caps="video/x-raw\(memory:VASurface\)"

First we have to know why the vaapisink caps template doesn't match with
video/x-raw

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