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

[bugzilla-daemon@freedesktop.org]

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

--- Comment #3 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to Boyuan Zhang from comment #2)
> Hi Andy,
> 
> The corruption/out of order issue has been reproduced locally. Root cause
> and fix can be found at
> https://lists.freedesktop.org/archives/mesa-dev/2016-October/132268.html
> 
> Please give a try.
> 
> Regards,
> Boyuan

Thanks, that does fix the out of order and corruption.

As you explained in the thread above, dual instance bitrate control is a
separate issue, but this patch does change behavior a bit.

cbr is unaffected by patch and could be seen as OK (unless I find a better test
to break it). md5sums may vary but the bitrate/file size is only different by a
tiny amount and visually things seem OK.

vbr is different, before patch it may be OK, but there was a chance of some
files being less that half size/rate than they should.

With the patch it seems that they are all now less than half rate. So at least
it's consistent (md5sums do still vary).

Will test more tomorrow as it's late here.

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