[Bug 764169] vp9dec: Dogslow VP9 4k playback with libvpx, works fine with avdec_vp9

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764169

--- Comment #13 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
I don't have enough cores to test Jeff setup, but when I added this code, I was
comparing against Chrome 720p CPU usage on a Quad Core ARM. With the memory
stuff, it was making it equivalent.

The 10 second might be something that we can solve with a min threshold in
buffering. VP9 decoding cost (same for most codec) is not uniform in term of
require processing resources. If you have too much variation, or the first part
is simply more expensive, you get stutter. Shall we re-open for more
investigation ?

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