Best Video Formats for Youtube

The video formats shown below are all supported by Youtube.

Windows Media Video (.WMV)
3GP (Cell Phones)
AVI (Windows)
MOV (mac)
MP4 (iPod/PSP)
MPEG
FLV (Adobe Flash)
SWF (Shockwave Flash)
MKV (h.264)
Theora
DivX

We have found out the following settings give the best uploading results on Youtube. Here's a summary of the audio and video specifications you will need if you want to get the best format for Youtube uploading.

Best format for YouTube: H.264, MPEG-2 or MPEG-4
Aspect Ratio: Native aspect ratio without letterboxing (examples: 4:3, 16:9)
Resolution: 640x360 (16:9) or 480x360 (4:3) recommended
Audio format: MP3 or AAC preferred
Frames per second: 30
Maximum length: 10 minutes (we recommend 2-3 minutes)
Maximum file size: 2 GB