WIP: ffmpeg hwaccelerated decoding feedback wanted #1412
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Barebones work in process HW accelerated decoding.
Once the TODO wrt pixel format selection is handled it should (I think) work on all platforms.
Future improvements can include doing deinterlacing & scaling on GPU via GPU filters, and if there are no CPU based filters (I believe FPS is safe, since it just drops & dups frames) active we can skip downloading to GPU entirely and copy into a OpenGL texture via the correct interop methods.