如何知道youtube video的格式?

The company is based in San Bruno, California, and uses Adobe Flash Video technology( FLV ) to display a wide variety of user-generated video content, including movie clips, TV clips, and music videos, as well as amateur content such as video blogging and short original videos.
http://en.wikipedia.org/wiki/YouTube


圖片參考：//www.google.com/help/hc/images/logos/youtube_logo.gif

Here's the list of some well-known formats which YouTube
supports for upload:
WebM files (Vp8 video codec and Vorbis Audio codec).MPEG4, 3GPP and MOV files - (typically supporting h264 and 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)
圖片參考：http://t1.gstatic.com/images?q=tbn:B2vNObZgLYJQsM:http://forum.videohelp.com/images/guides/p1731532/blade.runner.youtube.demo.v1.png