Hi Ilia, A fortnight ago, you wrote: > > The video plays, CPU load is less (my aim), but there's ‘tearing’ of > > the picture as if small rectangles that are updates are appearing in > > the wrong location, off by a little. If I step through the frames > > with mpv's ‘.’ and ‘,’ then I've found a pattern: one frame's > > picture is good, followed by N bad ones where N is 3 or 7, i.e. > > every 4th or 8th frame is okay. Don't know if that's a clue or > > helps someone here recognise a known problem. > > Unfortunately I've never tracked down the cause for this. > https://nouveau.freedesktop.org/wiki/VideoAcceleration/ - see note #4. That sounds like the problem, but it is all the way through TV programme from the BBC iPlayer's service. > I have, over time, collected some sample videos where this happens in > the first few frames. The plan was to do mmt traces of the blob > driver, and figure out what it was doing differently. If this is > something you're interested in, I'd be happy to provide some guidance. I've two mmio traces, nouveau and nvidia, each using mpv(1) to play the same ten-second extract of an iPlayer MP4, with and without ‘--vo=vdpau --hwdec=vdpau’. $ grep -n ^MARK nvidia-4.mmiotrace 20:MARK 65645.302939 buffer_size_kb: 524288 21:MARK 65645.385776 starting x 1447554:MARK 65681.979892 x started 1448560:MARK 65682.446747 mpv none start 1868197:MARK 65701.153770 mpv none done 1869462:MARK 65702.748005 mpv vo start 2633729:MARK 65724.465154 mpv vo done 2634956:MARK 65726.259829 mpv vo hwdec start 5347520:MARK 65759.841432 mpv vo hwdec done 5349019:MARK 65762.431137 killing cat $ hwdec on nvidia easily overflowed the default 1,408 KiB trace buffer, whereas nouveau didn't. Are these helpful? Shall I submit them to the Gmail address given in https://nouveau.freedesktop.org/wiki/MmioTrace/ -- Cheers, Ralph. _______________________________________________ Nouveau mailing list Nouveau@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/nouveau
