Linux_64, Youtube: HTML 5 videos are black although sound and buttons work perfectly

Hi,
I have an up-to-date Firefox on a 64 bits GNU/Linux, also up-to-date (it's PCLinuxOS).
Flash videos work sufficiently well (quite slow though, but I guess that's normal), but I have a problem with HTML 5 videos on youtube (haven't tried other ones): the buttons are displayed correctly and are functional, the sound of the video is rendered without problems. But there is no video, all I get is a black image.
When I right-click on "Stats for nerds", I see:
Dimensions: 640x360
Resolution: 0x0
Stream type: https
Mime Type: video/mp4; codecs="avc1.42001E, mp4a.40.2"
All the "decoded frames", "video bytes decoded", etc. fields are empty ("-").
I have tried to launch firefox in safe mode, disabling hardware acceleration (which anyhow doesn't work on linux, does it?), emptied the cache, none of it worked...
What do you think?

This is not about codecs or media support in Firefox, but about native GStreamer support in Linux.
Note that disabling this pref also prevents playing other supported media formats like mp3 via the HTML5 media player.
*[https://bugzilla.mozilla.org/show_bug.cgi?id=794282 bug 794282] - Enable GStreamer in official builds

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