Steven Zakulec (MultimediaWiki user Dashcloud) has performed an amazing service and tested every single sample in the MPlayer repository against FFmpeg. Can you even imagine? He has provided a spreadsheet (~87 KB, OpenOffice Calc format) that details which samples work or not given a particular SVN revision of the FFmpeg repository. I think this information needs to get into a searchable & maintainable online database soon so it does not go stale.
AWESOME!
quick! someone convert it to html and put it on the wiki :)
gstreamer has a test report now as well.
roadmap: http://live.gnome.org/GStreamerMediaTest
report: http://core.fluendo.com/gst-media-test/
gstreamer sample repo: http://gstreamer.freedesktop.org/media/