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  • #1560
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Issue created Mar 29, 2021 by Víctor Manuel Jáquez Leal@vjaquezMaintainer

va: decoders pass rate in fluster

I ran fluster comparing va plugin in gst-plugins-bad vs gstreamer-vaapi

These are the results (iHD):

VA VAAPI
H264 128/135 126/135
H265 120/147 142/147
VP9 150/303 216/303
VP8 55/61 57/61

Checking the VP9 results I realize that it can be improved disabling image formats. It seems that CSC for decoders is not 100% correct. Something that @He_Junyan told me, but I took it as a compromise for software based conversion in typical use cases as with xvimagesink.

For the sake of the tests, I disabled those extra color and some tests got fixed, but some other tests (with big resolutions) where terribly slow, generating timeouts in fluster. I realized that it was because of derived images. Right now va plugin is quite aggressive using derived images. @haihao warned us about this in the past. So I disabled derived images, and the software-based conversion turned as fast as expected.

Results with default surface format (NV12) and no derived images:

VA VAAPI
H264 129/135 126/135
H265 142/147 142/147
VP9 190/303 216/303
VP8 57/61 57/61

I would like to have the numbers for i915 driver and amd gallium, but for sake of correctness, using the default color format and disabling derived for frame reading, looks like a "good think".

Edited Mar 31, 2021 by Víctor Manuel Jáquez Leal
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