[Bug 98005] VCE dual instance encoding inconsistent since st/va: enable dual instances encode by sync surface

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98005

--- Comment #11 from Andy Furniss <adf.lists at gmail.com> ---
It turns out with more time + different tests that these patches don't fix the
original issue.

I can still get too low bitrates depending on timing/luck eg. forcing
powerplay/cpufreq to high with the right test stream can get different results
from auto. This is testing with the same GOP and (so far) disabling dual
instance does seem to always produce the correct bitrate.

I also found another bug = ntsc framerates are not handled. I live in PAL land,
so didn't notice this sooner, though we still get /1001 framerates on blu-ray
which is how I belatedly noticed.

I made a hacky fix - maybe working out where (if anywhere) the players pass
framerate den would be better, but I'll attach it anyway just to see what you
think (it only applies to vanilla mesa). Seems to work OK with avconv and
gstreamer.

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