Use livestreamer
Code:
https://github.com/chrippa/livestreamer
Use it like this on justin.tv & twitch.tv streams
Code:
livestreamer http://www.justin.tv/????? iphonehigh
livestreamer http://www.justin.tv/????? iphonehigh_hls
livestreamer http://www.justin.tv/????? iphonelow
livestreamer http://www.justin.tv/????? iphonelow_hls
livestreamer http://www.justin.tv/????? live
????? = channel name