[Libva] Can libva encode from opengl texture?

[Shi Yan]

Hello,

I want to encode my opengl rendering result into h264 with libva. I found
the bottleneck is actually preparing the yuv image from the rgb rendering
result. NVIDIA, for example, provides a way to directly encode an opengl
texture map into video. I wonder if similar function exists with libva? I
know it has some interoperability with egl, but I'm not sure if it is just
for displaying decoded result?

Thank you,

Shi
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