Às 14:46 de 27/07/2019, Ilia Mirkin escreveu:
On Sat, Jul 27, 2019 at 7:37 AM Ralph Corderoy <ralph@xxxxxxxxxxxxxxx> 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.
<snip>
Unfortunately I've never tracked down the cause for this.
https://nouveau.freedesktop.org/wiki/VideoAcceleration/ - see note #4.
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.
<snip>
I don't really know anything about hw coding, but looking from the outside, it
seems some kind of ring buffer with exact 3 frames maybe intended to work kinda
like using tripple buffering? I know for once that nvidia works better using
tripple buffering from what I've read from the kwin threads.
Solerman
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