Well simply filed a report with the older info:
https://bugs.chromium.org/p/chromium/issues/detail?id=1238383

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https://bugs.launchpad.net/bugs/1933088

Title:
  Does not work properly for videos with latest Chrome

Status in chromium-browser package in Ubuntu:
  Incomplete

Bug description:
  Chrome always gives software decoders for videos even though the same
  method works on Ubuntu 21.04 or Fedora 34 with Xorg. I can get
  VDAVideoDecoder with these new distros but not with Ubuntu 20.04 LTS
  and suspecting that package. I run Google Chrome (currently
  91.0.4472.114) with these flags:

  --use-gl=desktop --enable-features=VaapiVideoDecoder --force-dark-mode
  --flag-switches-begin --enable-gpu-rasterization --enable-zero-copy
  --ignore-gpu-blocklist --flag-switches-end --origin-trial-disabled-
  features=SecurePaymentConfirmation

  with intel-media-driver-non-free installed.

  vainfo:
  libva info: VA-API version 1.7.0
  libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
  libva info: Found init function __vaDriverInit_1_7
  libva info: va_openDriver() returns 0
  vainfo: VA-API version: 1.7 (libva 2.6.0)
  vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 20.1.1 ()
  vainfo: Supported profile and entrypoints
        VAProfileNone                   :       VAEntrypointVideoProc
        VAProfileNone                   :       VAEntrypointStats
        VAProfileMPEG2Simple            :       VAEntrypointVLD
        VAProfileMPEG2Simple            :       VAEntrypointEncSlice
        VAProfileMPEG2Main              :       VAEntrypointVLD
        VAProfileMPEG2Main              :       VAEntrypointEncSlice
        VAProfileH264Main               :       VAEntrypointVLD
        VAProfileH264Main               :       VAEntrypointEncSlice
        VAProfileH264Main               :       VAEntrypointFEI
        VAProfileH264Main               :       VAEntrypointEncSliceLP
        VAProfileH264High               :       VAEntrypointVLD
        VAProfileH264High               :       VAEntrypointEncSlice
        VAProfileH264High               :       VAEntrypointFEI
        VAProfileH264High               :       VAEntrypointEncSliceLP
        VAProfileVC1Simple              :       VAEntrypointVLD
        VAProfileVC1Main                :       VAEntrypointVLD
        VAProfileVC1Advanced            :       VAEntrypointVLD
        VAProfileJPEGBaseline           :       VAEntrypointVLD
        VAProfileJPEGBaseline           :       VAEntrypointEncPicture
        VAProfileH264ConstrainedBaseline:       VAEntrypointVLD
        VAProfileH264ConstrainedBaseline:       VAEntrypointEncSlice
        VAProfileH264ConstrainedBaseline:       VAEntrypointFEI
        VAProfileH264ConstrainedBaseline:       VAEntrypointEncSliceLP
        VAProfileVP8Version0_3          :       VAEntrypointVLD
        VAProfileVP8Version0_3          :       VAEntrypointEncSlice
        VAProfileHEVCMain               :       VAEntrypointVLD
        VAProfileHEVCMain               :       VAEntrypointEncSlice
        VAProfileHEVCMain               :       VAEntrypointFEI
        VAProfileHEVCMain10             :       VAEntrypointVLD
        VAProfileHEVCMain10             :       VAEntrypointEncSlice
        VAProfileVP9Profile0            :       VAEntrypointVLD
        VAProfileVP9Profile2            :       VAEntrypointVLD

  Tried with iHD and i965, nothing changed at all. Got VpxVideoDecoder
  instead of VDAVideoDecoder and my GPU has the capability of using
  VDAVideoDecoder, as it worked with Ubuntu 21.04 and Fedora 34.

  I have Intel UHD Graphics 620.

  lsb_release -rd
  Description:  Ubuntu 20.04.2 LTS
  Release:      20.04

  apt-cache policy intel-media-va-driver-non-free 
  intel-media-va-driver-non-free:
    Installed: 20.1.1+ds1-1build1
    Candidate: 20.1.1+ds1-1build1
    Version table:
   *** 20.1.1+ds1-1build1 500
          500 http://tr.archive.ubuntu.com/ubuntu focal/multiverse amd64 
Packages
          100 /var/lib/dpkg/status

  What you expected to happen:
  Got VDAVideoDecoder when watching a video with Google Chrome.

  What happened instead:
  Got VpxVideoDecoder, which is a software decoder. Also, h264ify-variants did 
not work.

  
  Thanks in advance.

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