https://bugs.freedesktop.org/show_bug.cgi?id=109538
Bug ID: 109538
Summary: VAAPI HEVC encoding is unstable and produces garbled
output
Product: DRI
Version: DRI git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: DRM/AMDgpu
Assignee: dri-devel@lists.freedesktop.org
Reporter: tempel.jul...@gmail.com
Do
ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128
-hwaccel_output_format vaapi -i 1080p_h.264_60fps.mp4 -c:v hevc_vaapi -qp 22
-tier high -c:a copy output.mp4
Several times and browse the web with Firefox while doing so. Sooner or later
(rather sooner) the encoding will either hang or the driver crashes completely
and I need to perform a hard reset.
The encoding settings don't seem to matter as long -c:v hevc_vaapi is used.
-c:v h264_vaapi seems to be totally stable.
The encoding result of -c:v hevc_vaapi also shows a garbled line at the bottom
of the video, while -c:v h264_vaapi looks fine.
This is with a RX 580
mesa-git 19.1.0_devel.107212.ab940b0d972
linux 4.20.6 & drm-next-5.1-wip f9028b9278422fdf186f1b88662e28ed24e13df8
libva 2.4
ffmpeg-git b429c86d84cfc964c84bc68ec56799802de2b25a
There seems to be a difference between linux 4.20.6 & drm-next-5.1-wip though.
I couldn't make the stable kernel crash entirely, instead just the encoding
process started to hang.
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