Corrupted VA-API playback via mpv/vlc with i965 driver on Cherryview (Gen8)

Hello,
Using a fully updated new Arch install, playback of videos suffer from extensive blockiness/pixelation. This occurs using either mpv or vlc with VA-API hardware acceleration enabled. It affects both h264 and h265 videos. Disabling hardware acceleration eliminates the problem (but makes h265 HD videos not playable because of the weak processor). Perhaps of note, the corrupted playback of hardware accelerated videos does not crash or produce error messages with mpv. The machine in question has a Celeron N3160 (HD Graphics 400). [Another Arch user is also reporting the issue and claims accelerated playback had previously worked correctly.](https://bbs.archlinux.org/viewtopic.php?pid=2056375) Please let me know if I need to provide any other information or should post this report somewhere else.

vainfo
```
vainfo: VA-API version: 1.15 (libva 2.15.0)
vainfo: Driver version: Intel i965 driver for Intel(R) CherryView - 2.4.1
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Simple : VAEntrypointEncSlice
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointEncSlice
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileH264MultiviewHigh : VAEntrypointVLD
VAProfileH264MultiviewHigh : VAEntrypointEncSlice
VAProfileH264StereoHigh : VAEntrypointVLD
VAProfileH264StereoHigh : VAEntrypointEncSlice
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileNone : VAEntrypointVideoProc
VAProfileJPEGBaseline : VAEntrypointVLD
VAProfileJPEGBaseline : VAEntrypointEncPicture
VAProfileVP8Version0_3 : VAEntrypointVLD
VAProfileVP8Version0_3 : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointVLD
```
cat /proc/cpuinfo
```
processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 76
model name : Intel(R) Celeron(R) CPU N3160 @ 1.60GHz
stepping : 4
microcode : 0x411
```
lsgpu
```
card0 Intel Cherryview (Gen8) drm:/dev/dri/card0
└─renderD128 drm:/dev/dri/renderD128
```
mpv --msg-level=vd=v,vo=v,vo/gpu/vaapi-egl=trace

```
mpv --msg-level=vd=v,vo=v,vo/gpu/vaapi-egl=trace --hidpi-window-scale=no "video/Big Buck Bunny.mp4"
(+) Video --vid=1 (*) (h264 1280x720 24.000fps)
[vo/gpu] Probing for best GPU context.
[vo/gpu/opengl] Initializing GPU context 'wayland'
[vo/gpu/opengl] Initializing GPU context 'x11egl'
[vo/gpu/x11] X11 opening display: :0
[vo/gpu/x11] Display 0 (eDP1): [0, 0, 1920, 1080] @ 60.031418 FPS
[vo/gpu/x11] Current display FPS: 60.031418
[vo/gpu/opengl] EGL_VERSION=1.5
[vo/gpu/opengl] EGL_VENDOR=Mesa Project
[vo/gpu/opengl] EGL_CLIENT_APIS=OpenGL OpenGL_ES
[vo/gpu/opengl] Trying to create Desktop OpenGL context.
[vo/gpu/opengl] Choosing visual EGL config 0xa, visual ID 0x20
[vo/gpu/opengl] GL_VERSION='4.6 (Core Profile) Mesa 22.1.7'
[vo/gpu/opengl] Detected desktop OpenGL 4.6.
[vo/gpu/opengl] GL_VENDOR='Intel'
[vo/gpu/opengl] GL_RENDERER='Mesa Intel(R) HD Graphics 400 (BSW)'
[vo/gpu/opengl] GL_SHADING_LANGUAGE_VERSION='4.60'
[vo/gpu] Testing FBO format rgba16f
[vo/gpu] Using FBO format rgba16f.
[vo/gpu] No advanced processing required. Enabling dumb mode.
[vo/gpu] Assuming 60.031418 FPS for display sync.
[vd] Container reported FPS: 24.000000
[vd] Codec list:
[vd] h264 - H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
[vd] h264_v4l2m2m (h264) - V4L2 mem2mem H.264 decoder wrapper
[vd] h264_qsv (h264) - H264 video (Intel Quick Sync Video acceleration)
[vd] h264_cuvid (h264) - Nvidia CUVID H264 decoder
[vd] Opening decoder h264
[vd] Looking at hwdec h264-nvdec...
[vo/gpu] Loading hwdec driver 'vaapi-egl'
[vo/gpu/vaapi-egl] using VAAPI EGL interop
[vo/gpu/vaapi-egl] Trying to open a x11 VA display...
[vo/gpu/vaapi-egl/vaapi] libva: VA-API version 1.15.0
[vo/gpu/vaapi-egl/vaapi] libva: Trying to open /usr/lib/dri/iHD_drv_video.so
[vo/gpu/vaapi-egl/vaapi] libva: va_openDriver() returns -1
[vo/gpu/vaapi-egl/vaapi] libva: Trying to open /usr/lib/dri/i965_drv_video.so
[vo/gpu/vaapi-egl/vaapi] libva: Found init function __vaDriverInit_1_13
[vo/gpu/vaapi-egl/vaapi] libva: va_openDriver() returns 0
[vo/gpu/vaapi-egl/vaapi] Initialized VAAPI: version 1.15
[vo/gpu/vaapi-egl] Going to probe surface formats (may log bogus errors)...
[vo/gpu/vaapi-egl/vaapi] libva: vaExportSurfaceHandle: fourcc 48323234 is not supported for export as separate planes.
[vo/gpu/vaapi-egl] vaExportSurfaceHandle() failed (invalid VASurfaceID)
[vo/gpu/vaapi-egl/vaapi] libva: vaExportSurfaceHandle: fourcc 50313134 is not supported for export as separate planes.
[vo/gpu/vaapi-egl] vaExportSurfaceHandle() failed (invalid VASurfaceID)
[vo/gpu/vaapi-egl/vaapi] libva: vaExportSurfaceHandle: fourcc 48323234 is not supported for export as separate planes.
[vo/gpu/vaapi-egl] vaExportSurfaceHandle() failed (invalid VASurfaceID)
[vo/gpu/vaapi-egl/vaapi] libva: vaExportSurfaceHandle: fourcc 56323234 is not supported for export as separate planes.
[vo/gpu/vaapi-egl] vaExportSurfaceHandle() failed (invalid VASurfaceID)
[vo/gpu/vaapi-egl/vaapi] libva: vaExportSurfaceHandle: fourcc 50343434 is not supported for export as separate planes.
[vo/gpu/vaapi-egl] vaExportSurfaceHandle() failed (invalid VASurfaceID)
[vo/gpu/vaapi-egl/vaapi] libva: vaExportSurfaceHandle: fourcc 48323234 is not supported for export as separate planes.
[vo/gpu/vaapi-egl] vaExportSurfaceHandle() failed (invalid VASurfaceID)
[vo/gpu/vaapi-egl] Supported formats:
[vo/gpu/vaapi-egl] nv12
[vo/gpu/vaapi-egl] yuv420p
[vo/gpu/vaapi-egl] rgba
[vo/gpu/vaapi-egl] rgb0
[vo/gpu/vaapi-egl] bgra
[vo/gpu/vaapi-egl] bgr0
[vo/gpu/vaapi-egl] gray
[vo/gpu/vaapi-egl] Done probing surface formats.
[vo/gpu] Loading hwdec driver 'cuda-nvdec'
Cannot load libcuda.so.1
[vo/gpu/cuda-nvdec] Failed to load CUDA symbols
[vo/gpu] Loading failed.
[vo/gpu] Loading hwdec driver 'drmprime-drm'
[vo/gpu/drmprime-drm] Failed to retrieve DRM fd from native display.
[vo/gpu] Loading failed.
[vd] Could not create device.
[vd] Looking at hwdec h264-vaapi...
[vd] Trying hardware decoding via h264-vaapi.
[vd] Selected codec: h264 (H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10)
[vd] Pixel formats supported by decoder: vdpau cuda vaapi yuv420p
[vd] Codec profile: Main (0x4d)
[vd] Requesting pixfmt 'vaapi' from decoder.
Using hardware decoding (vaapi).
[vd] Decoder format: 1280x720 vaapi[nv12] bt.709/bt.709/bt.1886/limited/auto CL=mpeg2/4/h264
VO: [gpu] 1280x720 vaapi[nv12]
[vo/gpu] reconfig to 1280x720 vaapi[nv12] bt.709/bt.709/bt.1886/limited/display SP=1.000000 CL=mpeg2/4/h264
[vo/gpu/x11] not waiting for MapNotify
[vo/gpu] Resize: 1280x720
[vo/gpu] Window size: 1280x720 (Borders: l=0 t=0 r=0 b=0)
[vo/gpu] Video source: 1280x720 (1:1)
[vo/gpu] Video display: (0, 0) 1280x720 -> (0, 0) 1280x720
[vo/gpu] Video scale: 1.000000/1.000000
[vo/gpu] OSD borders: l=0 t=0 r=0 b=0
[vo/gpu] Video borders: l=0 t=0 r=0 b=0
[vo/gpu] Reported display depth: 8
[vo/gpu] Testing FBO format rgba16f
[vo/gpu] Using FBO format rgba16f.
[vo/gpu] No advanced processing required. Enabling dumb mode.
[vo/gpu/x11] Disabling screensaver.
V: 00:00:04 / 00:09:56 (1%)

Exiting... (Quit)
[vo/gpu/x11] Enabling screensaver.
```
ffmpeg

```
ffmpeg version n5.1.1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12.2.0 (GCC)
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
libavutil 57. 28.100 / 57. 28.100
libavcodec 59. 37.100 / 59. 37.100
libavformat 59. 27.100 / 59. 27.100
libavdevice 59. 7.100 / 59. 7.100
libavfilter 8. 44.100 / 8. 44.100
libswscale 6. 7.100 / 6. 7.100
libswresample 4. 7.100 / 4. 7.100
libpostproc 56. 6.100 / 56. 6.100
```
mpv
```
mpv 0.34.1-dirty Copyright © 2000-2021 mpv/MPlayer/mplayer2 projects
built on UNKNOWN
FFmpeg library versions:
libavutil 57.17.100 (runtime 57.28.100)
libavcodec 59.18.100 (runtime 59.37.100)
libavformat 59.16.100 (runtime 59.27.100)
libswscale 6.4.100 (runtime 6.7.100)
libavfilter 8.24.100 (runtime 8.44.100)
libswresample 4.3.100 (runtime 4.7.100)
FFmpeg version: n5.1.1
```