The Internet Archive discovers and captures web pages through many different web crawls. At any given time several distinct crawls are running, some for months, and some every day or longer. View the web archive through the Wayback Machine.
Web wide crawl with initial seedlist and crawler configuration from March 2011 using HQ software.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20111203082827/http://www.google.com/support/youtube/bin/answer.py?hl=en&answer=55744
Supported YouTube formats - YouTube Help YouTube Help Supported YouTube formats
YouTube supports a wide variety of the range of video and audio formats in use. You can get a quick overview of what may be an issue with your video's formatting by taking a look at the warnings and error messages that we communicate to you while you're uploading your video.
Here is a list of some well-known formats that YouTube supports:
» WebM files - Vp8 video codec and Vorbis Audio codecs
» .MPEG4, 3GPP and MOV files - Typically supporting h264, mpeg4 video codecs, and AAC audio codec
» .AVI - Many cameras output this format - typically the video codec is MJPEG and audio is PCM
» .MPEGPS - Typically supporting MPEG2 video codec and MP2 audio
» .WMV
» .FLV - Adobe-FLV1 video codec, MP3 audio
Here is a list of some common formats that YouTube does NOT support:
» We prefer that you upload your video in the original format and in the highest quality possible.
» We prefer de-interlaced files.
» Audio and video lengths should be the same and audio should begin at the same time as the video.
» Look here if you need help to correct audio or video issues with uploads.
