I get the exact error you report on #161 if I try the Wayland command
(chromium --enable-features=VaapiVideoDecoder --disable-
features=UseChromeOSDirectVideoDecoder --ozone-platform=wayland) under
Xorg. Please double check you are not under Xorg when trying the Wayland
command.

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https://bugs.launchpad.net/bugs/1816497

Title:
  [snap] vaapi chromium no video hardware decoding

Status in chromium-browser package in Ubuntu:
  In Progress

Bug description:
  To test the snap with VA-API changes,

  1. Install the Chromium snap,

     sudo snap install --channel candidate/hwacc chromium

  2. If on Xorg (`echo $WAYLAND_DISPLAY` is empty),

     snap run chromium --disable-features=UseChromeOSDirectVideoDecoder
  --enable-features=VaapiVideoDecoder

     If on Wayland (`echo $WAYLAND_DISPLAY` is not empty),

      chromium --enable-features=VaapiVideoDecoder --disable-
  features=UseChromeOSDirectVideoDecoder --ozone-platform=wayland

  3. Open a video, e.g. one from https://github.com/chthomos/video-
  media-samples

  4. Enter about:media-internals in the address bar and note what the
  page says for kVideoDecoderName.

  Please report

  - The value for kVideoDecoderName from step 4. Success is typically 
{Vaapi,VDA,Mojo}VideoDecoder while failure is {FFMpeg,Vpx}VideoDecoder;
    - If failed, the video used for testing, including codec and resolution if 
possible;
  - Xorg or Wayland (`echo $WAYLAND_DISPLAY`);
  - Distro version (`grep VERSION= /etc/os_release`);
  - GPU (`lscpu`);
  - CPU generation (`lscpu`).

  About the last point, it may be that unfortunately only those with
  newer generations of Intel CPUs will have luck with this, but it's
  still an uncertainty. So reports are highly welcome.

  ----------Original Bug report ---------

  Libva is no longer working for snap installed chromium 72.0.3626.109
  (Official Build) snap (64-bit)

  I followed this instruction
  sudo snap install --channel=candidate/vaapi chromium

  My amdgpu can use libva

  `vainfo: Driver version: Mesa Gallium driver 18.3.3 for AMD STONEY (DRM 
3.27.0, 4.20.0-10.1-liquorix-amd64, LLVM 7.0.1)
  vainfo: Supported profile and entrypoints
        VAProfileMPEG2Simple            :       VAEntrypointVLD
        VAProfileMPEG2Main              :       VAEntrypointVLD
        VAProfileVC1Simple              :       VAEntrypointVLD
        VAProfileVC1Main                :       VAEntrypointVLD
        VAProfileVC1Advanced            :       VAEntrypointVLD
        VAProfileH264ConstrainedBaseline:       VAEntrypointVLD
        VAProfileH264ConstrainedBaseline:       VAEntrypointEncSlice
        VAProfileH264Main               :       VAEntrypointVLD
        VAProfileH264Main               :       VAEntrypointEncSlice
        VAProfileH264High               :       VAEntrypointVLD
        VAProfileH264High               :       VAEntrypointEncSlice
        VAProfileHEVCMain               :       VAEntrypointVLD
        VAProfileHEVCMain10             :       VAEntrypointVLD
        VAProfileJPEGBaseline           :       VAEntrypointVLD
        VAProfileNone                   :       VAEntrypointVideoProc`

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