I hit this bug on Fedora 28 when using a third-party mesa build. Here's
the ~/.drirc I used to fix this:

<driconf>
  <device driver="radeonsi">
    <application name="totem" executable="totem">
      <option name="allow_rgb10_configs" value="false" />
    </application>
  </device>
</driconf>

This also fixed the timecode in Totem showing strange, rainbow colors,
caused by the same thing. Repeat the application section as required for
each program affected.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1767312

Title:
  [radeon] Totem with gstreamer1.0-vaapi and Xorg: wrong color on H264
  videos

Status in gstreamer-vaapi package in Ubuntu:
  Confirmed
Status in mesa package in Ubuntu:
  Confirmed

Bug description:
  Ii've found a bug on Ubuntu 18.04 (other distros, as fedora 27, debian 
stable, debian testing) aren't affected).
  When i try to reproduce a video that use h264 codec, i've wrong colors.
  I've a notebook with APU AMD A10 8700p, and integrated gpu radeon r6

  WORKAROUND:
  sudo apt remove gstreamer1.0-vaapi
  or
  sudo apt remove mesa-va-drivers

  See also bug 1720820.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gstreamer-vaapi/+bug/1767312/+subscriptions

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