Nennt mich Klugschei**er ^^
Wiki
http://en.wikipedia.org/wiki/YouTube#Uploading
ZitatYouTube originally offered videos at only one quality level, but now has a range of quality levels as well as a format for viewing on mobile phones. The original format displayed videos at a resolution of 320x240 pixels using the H.263 Sorenson Spark codec, with mono MP3 audio.[64]
Since March 2008, YouTube videos have been available in a range of quality levels, with the higher quality levels offering improved picture definition.[65] In November 2008 720p HD support was added.[66] At the same time, the YouTube player was changed from a 4:3 aspect ratio to a widescreen 16:9. In November 2009, 1080p HD support was added. YouTube videos currently use the H.264/MPEG-4 AVC codec, with stereo AAC audio.
Avi ist nur als Eingangsformat möglich.