Created attachment 1=
43787 [details]
hardware-decoded screenshot
Hi,
on latest Mesa I still get tons of artifacts when decoding MPEG2 on my AMD =
card
via VAAPI, to the point where it is not usable for video decoding at all to=
be
honest.
I've attached sample screenshots to show the problem - one software-decoded=
and
one hardware-decoded via libva in mpv.
The sample video is taken from https://www.w6rz.net/1080p25.zip but the
artifacts are visible more or less on any MPEG2 video including DVDs.
There is this older bug report:
https://bugs.freedesktop.org/show_bug.c=
gi?id=3D93760 but I'm not sure it's
related because I do not get any assertion failure and it vaguely reads lik=
e it
has been fixed?
For clarification, I see no artifacts with VDPAU.
Tested with Mesa-19.1.0-devel (git-bea540173c), libva 2.5.0-pre1
(git-c98b06d2b8), FFmpeg N-93467-g54655623a8
VAAPI driver string: Mesa Gallium driver 19.1.0-devel for Radeon RX 580 Ser=
ies
(POLARIS10, DRM 3.27.0, 4.20.13-arch1-1-ARCH, LLVM 7.0.1)
I verified this with mpv, gstreamer and Kodi.
mpv seems to have disabled mpeg2 hw decoding by default due to this problem:
https://githu=
b.com/mpv-player/mpv/commit/3dd59dbe
In Kodi we cannot go this route because we want to support low-end hardware
that might have trouble decoding 1080p in software out-of-the-box.
I want to avoid having to blacklist the radeon vaapi driver for mpeg2 if
possible.