[Bug 792773] [gstreamer-vaapi-master][SKL/APL/KBL] it occurs gpu hang when do one case of vp8 decoding

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792773

--- Comment #11 from sreerenj <bsreerenj at gmail.com> ---
This issue is caused by the confusion between vp8 spec and what libvpx
implemented. Let's follow what libvpx is doing and that will fix the issue.

According to the vp8 spec, the first partition (size can be derived from the
frame header) should have all compressed header information and if that is
true, gst codecparser should work fine because we initialize the range decoder
with the exact size that derived from frame header, rather than using the
actual buffer size (total frame size). 

But it doesn't seem to be the case with some of the streams (all the attached
streams) and libvpx works fine because it uses the whole frame size (not the
first partition size) to initialize the bool decoder.

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