I am using Ubuntu 12.04 and kdenlive 0.8.2.1.
When I tried to render into avi, the 'render to file' button is shaded, parameters are not accessible, and I can not render.
So, I rendered in H.264 and went to the terminal to convert the mp4 file into avi. You know those colleagues ;)
Though the terminal converted it, I had the following warning:
ffmpeg version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2000-2011 the Libav developers built on Mar 22 2012 05:09:06 with gcc 4.6.3
This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
Could it be the reason kdenlive do not render in avi anymore on my system?