Public bug reported:

Since upgrading to 21.04 with wayland, mpv has been issuing warnings
(suggesting X session) but performing without any problem, including
with mp4 files. Until recently. Now the result is:

wl_drm@22: error 0: authenticate failed
VA error: wayland: Wayland roundtrip error: Protocol error (errno 71)
[vaapi] libva: vaGetDriverNameByIndex() failed with invalid VADisplay, 
driver_name = (null)
[vo/gpu/wayland] Error occurred on the display fd, closing

No problem if mpv is invoked with --hwdec=no. According to the mpv man
page, this is the default, Perhaps it was until recently (masking the
problem by using SW decoding).

The abort occurs with every mp4 file I have tried, and with no other
types.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: mpv 0.32.0-2ubuntu2
ProcVersionSignature: Ubuntu 
5.13.0-7614.14~1631647151~21.04~930e87c~dev-generic 5.13.1
Uname: Linux 5.13.0-7614-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 19 14:05:19 2021
InstallationDate: Installed on 2018-04-28 (1240 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: mpv
UpgradeStatus: Upgraded to hirsute on 2021-05-01 (141 days ago)

** Affects: mpv (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug hirsute third-party-packages wayland-session

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https://bugs.launchpad.net/bugs/1944088

Title:
  mpv aborts on mp4 files

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