[tor-bugs] #23921 [- Select a component]: Video not working (Tab crashing OR mp4 decoder not found)

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#23921: Video not working (Tab crashing OR mp4 decoder not found)
--------------------------------------+--------------------
     Reporter:  sd3e2423ada           |      Owner:  (none)
         Type:  defect                |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  - Select a component  |    Version:
     Severity:  Normal                |   Keywords:  video
Actual Points:                        |  Parent ID:
       Points:                        |   Reviewer:
      Sponsor:                        |
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 When opening YouTube and clicking on any video, the second the video would
 load the tab crashes with „Gah. Your tab just crashed.“. Click any other
 video on YouTube to recreate the same error.

 Using other video sites (tried numerous) the console log shows something
 like this: (what they all have in common is that the mp4 „could not be
 decoded“)

 ,,''load failed. video.php'',,

 ,,''All candidate resources failed to load. Media load paused.
 video.php'',,

 ,,''<source> element has no “src” attribute. Media resource load failed.
 video.php'',,

 ,,''All candidate resources failed to load. Media load paused.
 video.php'',,

 ,,''<source> element has no “src” attribute. Media resource load failed.
 video.php'',,

 ,,''All candidate resources failed to load. Media load paused.
 video.php'',,

 ,,''<source> element has no “src” attribute. Media resource load failed.
 video.php'',,

 ,,''All candidate resources failed to load. Media load paused.
 video.php'',,

 ,,''Media resource https://xyz.com/file.mp4 could not be decoded.'',,

 ,,''All candidate resources failed to load. Media load paused.
 video.php'',,

 ,,''Media resource https://xyz.com/file.mp4 could not be decoded. '',,

 ,,''video.php All candidate resources failed to load. Media load pause'',,

 Running most recent (stable) TorBrowser + MacOS 10.13. Nothing changed in
 about:config or regarding extensions. This appeared first two months ago
 with a stable TorBrowser version. Tried updating the stable version since
 then + nightly builds without any success of watching video with
 !TorBrowser.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23921>
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