Download link not working

[bitnol]

I am using YSD with youtube-dl which returns back the decoded signature via a php wrapper on server-side.
But download links are not working
For example:
"sig" => "EB69878B76990CA0D5C3C33852BD7EAEFF39741E.82DE130CE80E7FC7CFF2078669F94FD38A1BDFAB",
"vid" => "_JQH3G0cCtY",
"url" => "http://s.ytimg.com/yts/jsbin/html5player-vfl9qWoOL.js"

decoded signature = 7AFDB1A83DF49F9668702FFC8CF7E08EC031ED2B.E1479EFFEA37DB25833C3C5D0AC099E7B87896B6

Final link = http://r9---sn-cvh7zn7y.googlevideo.com/videoplayback?id=fc9407dc6d1c0ad6&expire=1391547839&sver=3&ipbits=0&ms=au&sparams=gcr,id,ip,ipbits,itag,ratebypass,source,upn,expire&source=youtube&mt=1391524644&ratebypass=yes&fexp=900161,936117,936910,936913&itag=22&key=yt5&ip=117.199.152.39&upn=bsyZXhzGxls&mv=m&gcr=in&signature=7AFDB1A83DF49F9668702FFC8CF7E08EC031ED2B.E1479EFFEA37DB25833C3C5D0AC099E7B87896B6

Also, the url_encoded_fmt_stream_map dictionary data obtained via get_video_info is

fallback_host=tc.v9.cache1.googlevideo.com&s=EB69878B76990CA0D5C3C33852BD7EAEFF39741E.82DE130CE80E7FC7CFF2078669F94FD38A1BDFAB&quality=hd720&itag=22&type=video/mp4; codecs="avc1.64001F, mp4a.40.2"&url=http://r9---sn-cvh7zn7y.googlevideo.com/videoplayback?id=fc9407dc6d1c0ad6&expire=1391547839&sver=3&ipbits=0&ms=au&sparams=gcr%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&source=youtube&mt=1391524644&ratebypass=yes&fexp=900161%2C936117%2C936910%2C936913&itag=22&key=yt5&ip=117.199.152.39&upn=bsyZXhzGxls&mv=m&gcr=in

I am sure the decoded signature is 100% correct but don't understand why the download link is not working.

[phihag]

Your question is about YSD, not youtube-dl. Please do not file questions about YSD in the youtube-dl issuetracker. Instead, file questions about YSD in the YSD issue tracker.

That being said, are you sending the same cookies, using the same user-agent header, sending the request from the same IP address, and sending the request shortly after extraction? All these are or were required at some point.