Comment # 4
on bug 105145
from Christian König
(In reply to k.philipp from comment #2) > Since we can do weaving on the Kodi side anyway (for VDPAU), would it be > enough to add flags, say VA_EXPORT_SURFACE_TOP_FIELD and > VA_EXPORT_SURFACE_BOTTOM_FIELD, to vaExportSurfaceHandle? Would that then be > roughly equivalent to what we get with VDPAURegisterVideoSurfaceNV? Yes, exactly that's what's needed. (In reply to k.philipp from comment #3) > Here's what we'll do instead (in case someone comes here looking for a > workaround): > - For 2K video or less: Always do VAAPI postprocessing. If the content turns > out to be progressive, we do an unnecessary copy (as the driver has to > weave). But it enables us to switch deinterlacing on and off on a per-frame > basis - needed not only for toggling deinterlacing on user wish, but also > for mixed progressive/interlaced video. If you're very sure there are no > interlaced frames anywhere in the video, postprocessing could also be turned > off (we're usually not). > - For more than 2K video: Start with no VAAPI postprocessing for best > performance. If interlaced frames are encountered, activate VAAPI > postprocessing and reinitialize decoding with fresh surfaces. This means > we'll drop frames and lag around for a bit, but should be OK-ish since >2K > interlaced content is very rare. Sounds like a good plan to me as well. > Also, that VAAPI has to weave the first few textures before they've been > exported once is not very nice. Is there some kind of hint we could give the > driver that we want to have progressive surfaces? Not that I know of, but feel free to suggest something. General problem with VA-API seems to be that suggestions made by AMD seems to be mostly ignored. Also don't call it interlaced/progressive (that was just me trying to make sense of what the hardware is doing). Instead call it something in the line of FIELD and FRAME, that is the more common terminology at least in the different MPEG standards.
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