You're right, the CoreAVC plugin is not publicly available, yet.
See this post for an explanation of the slowness with the FFMPEG plugin decoding AVC-encoded video.
http://www.aximsite.com/boards/showp...31&postcount=7
Greg Smith
Author, FeederReader - Pocket PC *direct* RSS text, audio, video, podcasts
www.FeederReader.com - Download on the Road