[Bug 1323822]

Mossroy 1323822 at bugs.launchpad.net
Thu Jul 10 20:12:20 UTC 2014

It looks like it's related to a libav bug. See https://bugzilla.libav.org/show_bug.cgi?id=597 and https://bugzilla.libav.org/show_bug.cgi?id=341
It has been fixed in libav between versions 9.13 and 9.14.

So it looks like Firefox is less permissive than Gstreamer, Chromium and
VLC on WebM files...

In any case, could Firefox output an error message in such cases,
instead of silently failing?

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  Firefox can not play some WebM videos generated by avconv on Trusty

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