For what it's worth, if it might help somebody : As a temporary workaround before this issue is fixed, I succesfully use Docker (http://packages.ubuntu.com/trusty/docker.io) to convert my videos in an isolated environment. I prefer not to install ffmpeg or upgrade libav through PPAs on my main system (Some other applications depend on libav and I don't want to break them), and it's a very lightweight solution compared to starting a complete virtual machine.
I used a Trusty image provided by the official repo of Docker (https://index.docker.io/_/ubuntu/) and configured the ffmpeg PPA in it. After commiting my modified image (called trusty-ffmpeg below), I can run the conversion with a command-line like : sudo docker run -i -t -v /home/mossroy/Videos:/host trusty-ffmpeg ffmpeg -i /host/P5270914.MOV /host/P5270914-trusty-docker.webm (note that I use the -v option to map the path of my video to a /host directory inside the docker container) It gives the same result as https://bugs.launchpad.net/ubuntu/+source/libav/+bug/1323822/+attachment/4121477/+files/P5270914-trusty-ffmpeg.webm , which works properly in Firefox. It did not notice the docker performance overhead, so it works really well for me -- 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
