[ffmpeg/video] vp9: No support for codec vp9 profile 0.

"vainfo" command lists codecs supported by hardware. Acceleration can be disabled using mpv --hwdec=no to check if lags occur.

Output of vainfo :

```
libva info: VA-API version 1.14.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_14
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.14 (libva 2.12.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 22.3.1 ()
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple : VAEntrypointVLD
      VAProfileMPEG2Main : VAEntrypointVLD
      VAProfileH264Main : VAEntrypointVLD
      VAProfileH264High : VAEntrypointVLD
      VAProfileJPEGBaseline : VAEntrypointVLD
      VAProfileH264ConstrainedBaseline: VAEntrypointVLD
      VAProfileVP8Version0_3 : VAEntrypointVLD
```

The audio lags seems to be fixed after using graphics-extension, only this error sprouts up.
This states that vp9 isnt supported as such i believe this is more of a lack/deficiency on the user side than a bug ?

This is because the integrated GPU was developed before VP9 release.
Have you tried --hwdec=no ? If lags still occur, there is nothing can be done yet:
GPU shaders video decoding (using vulkan) seems doesn't have VP9 support https://github.com/mpv-player/mpv/issues/11739

People that have old hardware can blacklist non-accelerated codecs in yt-dlp config https://wiki.archlinux.org/title/Mpv#youtube-dl_and_choosing_formats
Constant audio delay can be fixed by --mc=100 option https://mpv.io/manual/stable/#options-mc

Thanks for the info, the audio lag isn't much to be observed especially fixed after using the graphics extension although yes this can be considered as hardware/software deficiency rather than the app itself.

**This isn't something that's wrong with the mpv-snap instead , its about the drivers and hardware which causes this issues. (My hardware or graphics doesn't support VP9 Hence the issue.)