[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

            Bug ID: 98005
           Summary: VCE dual instance encoding inconsistent since st/va:
                    enable dual instances encode by sync surface
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Bit late with this one, but I didn't notice initially.
It seems there is some timing/sync issue on R9285 with dual instance enabled
after

c59628d11b134fc016388a170880f7646e100d6f
st/va: enable dual instances encode by sync surface

Testing with large rawvideo/higher bitrates lucked me out of noticing initially
as visually these tend to be OK, though making say 20 and md5summing them will
show inconsistencies. I can change the number of "bads" in some tests by
flipping my cpus between cpufreq on_demand and perf.

At lower sizes/bitrates/transcoding it's possible to get corruption, either in
the form of some runs giving abnormally low bitrate with vbr, or sometimes with
cbr there is a chance of an out of order frame around an IDR frame.

Testing this with gstreamer.

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