Using ffmpeg and avconv [Dec. 15, 2012, 11:16 a.m.]
A hands on look at command line encoding
WebM
an overview of usefull ffmpeg/avconv options related to encoding WebM files. http://wiki.webmproject.org/ffmpeg and http://ffmpeg.org/ffmpeg.html#libvpx
http://rodrigopolo.com/ffmpeg/cheats.html
creating h264 files that work on many mobile devices
http://h264.code-shop.com/trac/wiki/Encoding
general x264 encoding guide