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Forms Based Authentication Filtered Content Editor for SharePoint
http://www.eggheadcafe.com/tutorials/aspnet/cb4d6067-0cff-479b-af5c-5aeaa4556c43/forms-based-authenticatio.aspx
No--you need to write your own code. Also, since only you know about
your encoder implementation, you're the only person who can write it
(you'll need some encoder-specific output to write the h264 track in
mp4v2). I suggest you review the mp4v2 documentation, which is quite
good and includes standard interfaces for writing H264 tracks.