最近对解析各大网站的js产生浓厚兴趣，特此mark一下
工具：firefox+firebug
新浪大片：
视频链接地址：http://video.sina.com.cn/m/aqgy2_61245441.html
视频:45417389
请求的第一个视频：http://d260.v.iask.com/f/1/6160a9a5ab1d2800f732faa7e7b2d55345418523.hlv
拖动后请求的视频：http://d260.v.iask.com/f/1/bd6f486f12e656649b98bbf5f3ff036e45418533.hlv
flv流媒体的实现：http://d260.v.iask.com/f/1/bd6f486f12e656649b98bbf5f3ff036e45418533.hlv?start=947745
注意到拖动之后通过start参数传递了最近的一个关键帧时间给服务器。
update:2011/12/26 不是关键帧时间，而是关键帧的字节偏移量。详细情况跟最后那个例子类似。flowplayer说道可以用range header来请求，不过还有个别的什么设置，那还是算了。
优酷的一个例子：
http://v.youku.com/v_show/id_XMzIzMjk3MTk2.html
http://119.188.0.131/youku/67771BCB54842831290EAC42C2/0300020D034ECFA6B2239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC.flv?start=388
http://61.158.246.49/youku/6576519897D358216DF3156BB9/0300020D044ECFA6B2239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC.flv?start=82
http://182.118.4.81/youku/6778B031B853E81D757FB563CA/0300020D054ECFA6B2239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC.flv?start=376
http://182.118.2.44/youku/67797A64ED64281F637A983E2B/0300020D064ECFA6B2239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC.flv?start=246
http://61.55.175.24/youku/677587658D3468108593E73F0D/0300020D014ECFA6B2239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC.flv?start=254
可以看出来，优酷的文件分段应该是url里面中间那一截，后面那个反倒是类似视频的id编号了。
update:2011/12/26 下载个看看：wget 'http://123.129.237.18/youku/6977E8EC8A23B81EB56A643E3E/0300010D024ED045DC239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC.flv' -U 'nimei'
wget进了黑名单不能下载，估计迅雷旋风神马的也在黑名单了。反倒是“nimei”他就让你下载了。。。
我发现优酷的是随便拖，传递给服务器的参数并不是关键帧的字节偏移量，因为它传递的根本就是个时间参数，应该是服务器据此得到最近的关键帧位置，然后还是从最近关键帧的字节偏移量开始传输。
http://v.youku.com/player/getPlayList/VideoIDS/80824299
http://f.youku.com/player/getFlvPath/sid/00_00/st/flv/fileid/0300020D004ECFA6B2239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC?K=9a72d451e3ed7d892410d7bb,k2:12d8205d6b06e339f
http://f.youku.com/player/getFlvPath/sid/00_00/st/flv/fileid/0300020D014ECFA6B2239C0027B0D4E6302513-73EA-6725-C7A9-4980A2A154EC?K=5ab3b92f338ea08228274cb5,k2:1a33af1988b110d83
......
update：2011/12/26来一个flowplayer官方给的例子：
http://flowplayer.org/plugins/streaming/pseudostreaming.html
点击播放，用chrome开发人员工具可以看到开始下载以下文件：http://pseudo01.hddn.com/vod/demo.flowplayervod/Extremists.flv
拖动几下，可以看到几个如下请求：
http://pseudo01.hddn.com/vod/demo.flowplayervod/Extremists.flv?start=2092300
http://pseudo01.hddn.com/vod/demo.flowplayervod/Extremists.flv?start=4741183
http://pseudo01.hddn.com/vod/demo.flowplayervod/Extremists.flv?start=6790520
http://pseudo01.hddn.com/vod/demo.flowplayervod/Extremists.flv?start=9082510
http://pseudo01.hddn.com/vod/demo.flowplayervod/Extremists.flv?start=11679034
http://pseudo01.hddn.com/vod/demo.flowplayervod/Extremists.flv?start=15134787
把该文件wget下来，用flvtool -P Extremists.flv可以看到以上请求的start参数的值均是关键帧的位置：
audiodatarate: 64.2495286035868
cuePoints:
hasKeyframes: true
hasVideo: true
framerate: 30
canSeekToEnd: true
stereo: true
lasttimestamp: 240.774
datasize: 22855899
videocodecid: 4
audiosamplerate: 22000
audiosize: 2035001
audiosamplesize: 16
videosize: 20817094
audiodelay: 0
hasAudio: true
filesize: 22921624
height: 360
lastkeyframetimestamp: 240.774
metadatacreator: inlet media FLVTool2 v1.0.6 - http://www.inlet-media.de/flvtool2
metadatadate: Tue Jul 28 08:07:58 GMT+0800 2009
duration: 240.807
videodatarate: 689.034762889681
audiocodecid: 2
keyframes:
times:
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hasMetadata: true
width: 640
hasCuePoints: false
...
