On a particular Youtube video, using the formats listed through
"youtube-dl -F <video-ID>",

Formats 266 (2160p), 264 (1440p), 160 (144p), and 18 (360p with audio)
are successfully opened by the xcb_xv vout display module.

Formats 137 (1080p), 136 (720p), 135 (480p), 134 (360p), 133 (240p), and
22 (720p with audio and more keyframes) result in an error.

With a different video, format 18 is the only h264 format that can be
opened, out of 10 formats. Format 18 works for two other videos as well.
Out of four videos with format 160 tested, two worked.


So it's possible there is a consistent explanation for which videos can be 
displayed, and which ones can't, though it might not be entirely predictable. 
Most h264 files from Youtube that aren't format 18 can't be opened. Youtube 
does use different processes for some of its videos, resulting in different 
frames being showed from a 60-fps source video or not having a certain pattern 
of '~18 frames of motion followed by 12 frames of stillness', but the fact that 
'newer' formats (as evidenced by the higher format number) worked in the first 
video tested could have been a coincidence.

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https://bugs.launchpad.net/bugs/1440254

Title:
  Recent update broke XVideo/XCB output for h264

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