Youtube MP4 link specimen

http://r3---sn-q4f7dnsd.c.youtube.com/videoplayback?sparams=cp,id,ip,ipbits,itag,ratebypass,source,upn,expire&ipbits=8&cp=U0hWTFBPV19JUENONl9ISUFIOnVNdVdxOFNGVFE0&upn=jHZJMcKsZzM&id=f62ccb7171f41eef&ratebypass=yes&mt=1377028728&source=youtube&mv=m&expire=1377049746&ms=au&ip=79.196.66.99&key=yt1&sver=3&fexp=920505,900370,916626,909546,906397,929117,929121,929906,929907,929922,929127,929129,929131,929930,925720,925722,925718,925714,929917,906945,929919,929933,912521,919206,932306,927704,913428,904830,919373,930803,904122,938701,919008,911423,909549,900816,912711,935802,904494,900372,900375,906001&itag=18&signature=3857FE05AC9C477AEEE657751D8760F167929A47.0AEEE0DEDFE6FABEBFAC285455D8230B404AE4DC