How To Download m3u8 Url with ffmpeg?

[moviestore]

hi
please help me
i want download this url with this command:

ffmpeg -i "https://gemus-vh.akamaihd.net/i/ondemand/hls/212/14742/1_,1280,720,640,480,.mp4.csmil/index_1_av.m3u8?null=&id=AgCX7uLKF9RsW8SsTlRqIy1Vf EnhEu9OE+%2fkge3qWd7K1axznoC%2fKcldQHiGnSSxd32XOaC mkeNNQw%3d%3d" -c copy C:\output.mkv

but recive this eror :
http eror 403 forbidden

master url with this command its ok and download master url :
ffmpeg -i "http://gemus-vh.akamaihd.net/i/ondemand/hls/4082/14756/1_,1280,720,640,480,.mp4.csmil/master.m3u8?hdnea=st=1414405495~exp=1423045495~acl =/*~hmac=42230690be122783bc4252c5990dbaf71e0dd59f736 ad962f58f78da90c90513&akamgem=gem1.m3u8" -c copy C:\output.mkv

master url donwload large file (RESOLUTION=1920x1080) i want download other RESOLUTION and Small File (RESOLUTION=1280x720)