It turns out with more time + different tests that these patch=
es 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 resu=
lts
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 =3D ntsc framerates are not handled. I live in PAL=
 land,
so didn't notice this sooner, though we still get /1001 framerates on blu-r=
ay
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 y=
ou
think (it only applies to vanilla mesa). Seems to work OK with avconv and
gstreamer.