[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 #39 from Andy Furniss <adf.lists at gmail.com> ---
While "normal" testing seems OK I've found a way to rarely get gstreamer to
fail to allocate a buffer.

ERROR vaapi gstvaapiencoder.c:341:gst_vaapi_encoder_put_frame: failed to
allocate coded buffer
ERROR vaapiencode gstvaapiencode.c:558:gst_vaapiencode_handle_frame: failed to
encode frame 559 (status -2)

This was a mean test - transcoding a 1080p file repeatedly with a couple of
scripts running that after random 1 to 20sec sleeps turn cpu/gpu from perf to
auto.

As long as nothing else is happening the results are good, but if I say run an
opengl demo like Unigine Valley as well there's a chance that I get the above
fail on say 1 out of 80 runs where a run is transcoding a 120 sec 24 fps
sample.

I can reproduce this with cbr, vbr or cqp and single instance - so maybe it
should get its own bug ....

Though using extreme tests to reproduce I initially noticed this without
running gl as such = only glamor scrolling xterm very fast as I had a load of
printfs in the code.

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