Nennt mich Klugschei**er ^^
YouTube 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.
Since March 2008, YouTube videos have been available in a range of quality levels, with the higher quality levels offering improved picture definition. In November 2008 720p HD support was added. 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.