Here's a little information for YouTube video encoding.
1. Encoding Do's and Don'ts
http://support.google.com/youtube/bin/a ... &ctx=topic
2. Supported files formats
http://support.google.com/youtube/bin/a ... &ctx=topic
3. Encoding with Windows Movie Maker
http://support.google.com/youtube/bin/a ... &ctx=topic
4. Suggested resolutions and bitrates
http://support.google.com/youtube/bin/a ... &ctx=topic
5. Advanced Encoding specifications
http://support.google.com/youtube/bin/a ... &ctx=topic
6. Live encoding specifications
http://support.google.com/youtube/bin/a ... &ctx=topic