Hi there Just encountered a problem with the OpenShot video editor under Ubuntu 12.04. For some reason, I couldn't export to mp4 (h.264 or mpeg4) because OpenShot moaned that libx264 and libmp3lame weren't installed. Fact is, they were installed (but as libmp3lame0, for instance). Didn't go into too much digging around for the root of this problem, but simply added the medibuntu repository and installed the avformat library, which solved the issue. Here is what I did: - added medibuntu repository (run in terminal) sudo wget --output-document=/etc/apt/sources.list.d/medibuntu.list http://www.medibuntu.org/sources.list.d/$(lsb_release -cs).list && sudo apt-get --quiet update && sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring && sudo apt-get --quiet update source: https://help.ubuntu.com/community/Medibuntu#Adding%20the%20Repository - installed avformat library (version 53 instead of 52): sudo apt-get install libavformat-extra-53 source: http://askubuntu.com/questions/26142/trouble-installing-codecs-libx264-and-l... HTH Cheers, Peter -- Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ http://www.cs.waikato.ac.nz/~fracpete/           Ph. +64 (7) 858-5174