After a few tests, I suspect the issue might come from the audio track. If I encode without the audio track : avconv -i P5270914.MOV -an P5270914-trusty-no-audio.webm
It gives me the attached file, and it plays fine on Firefox When comparing both mkvinfo (the ones generated with libav, on Precise and Trusty), you can notice that the audio track has a different bit depth (32 vs 16). Maybe the header bit depth could not correspond to the actual bit depth of the track, or something similar? ** Attachment added: "WebM file generated on Trusty with libav, without any audio track" https://bugs.launchpad.net/ubuntu/+source/libav/+bug/1323822/+attachment/4123650/+files/P5270914-trusty-no-audio.webm -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1323822 Title: Firefox can not play some WebM videos generated by avconv on Trusty To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1323822/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
