how to download resolution 1280x720 in this link with ffmpeg
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http://gemus-vh.akamaihd.net/i/ondemand/hls/5522/14872/1_,1280,720,640,480,.mp4.csmil/master.m3u8?hdnea=st=1414591657~exp=1423231657~acl=/*~hmac=2669dacf5e178c2143056ecb6f122469f6c2bac41451d3e48529f926b67629b1&akamgem=gem1.m3u8