Arch Linux

Currently the x264 package is built without ffms (FFmpegSource) support. Adding this as a dependency can simplify encoding.

FFmpegSource (usually known as FFMS or FFMS2) is a cross-platform wrapper library around libav, plus some additional components to deal with file formats libavformat has (or used to have) problems with. It gives you an easy, convenient way to say "open and decompress this media file for me, I don't care how you do it" and get frame- and sample-accurate access (usually), without having to bother with the sometimes less than straightforward and less than perfectly documented libav API.

http://code.google.com/p/ffmpegsource/