유튜브는 내부적으로 여러 포맷을 지원함
fmt라는건 format 을 줄인 말
// fmt=0 -> flv: 320x240 (flv1) / mp3 1.0 22KHz
// fmt=5 -> flv: 320x240 (flv1) / mp3 1.0 22KHz
// fmt=6 -> flv: 480x360 (flv1) / mp3 1.0 44KHz
// fmt=13 -> 3gp: 176x144 (mpg4) / ??? 2.0 8KHz
// fmt=17 -> 3gp: 176x144 (mpg4) / ??? 1.0 22KHz
// fmt=18 -> mp4: 480x360 (H264) / AAC 2.0 44KHz
// fmt=22 -> mp4: 1280x720 (H264) / AAC 2.0 44KHz
// fmt=34 -> flv: 320x180 (flv?) / ??? 2.0 44KHz
// fmt=35 -> flv: 640x380 (flv?) / ??? 2.0 44KHz
http://www.youtube.com/get_video?video_id=fnrHGo8LLo8&t=OEgsToPDskJsEQKwMS2rlSS59p15WWOl&el=detailpage&ps=&fmt=5
http://www.youtube.com/get_video?video_id=fnrHGo8LLo8&t=OEgsToPDskJsEQKwMS2rlSS59p15WWOl&el=detailpage&ps=&fmt=6
http://www.youtube.com/get_video?video_id=fnrHGo8LLo8&t=OEgsToPDskJsEQKwMS2rlSS59p15WWOl&el=detailpage&ps=&fmt=13
http://www.youtube.com/get_video?video_id=fnrHGo8LLo8&t=OEgsToPDskJsEQKwMS2rlSS59p15WWOl&el=detailpage&ps=&fmt=17
http://www.youtube.com/get_video?video_id=fnrHGo8LLo8&t=OEgsToPDskJsEQKwMS2rlSS59p15WWOl&el=detailpage&ps=&fmt=18
http://www.youtube.com/get_video?video_id=fnrHGo8LLo8&t=OEgsToPDskJsEQKwMS2rlSS59p15WWOl&el=detailpage&ps=&fmt=34
http://www.youtube.com/get_video?video_id=fnrHGo8LLo8&t=OEgsToPDskJsEQKwMS2rlSS59p15WWOl&el=detailpage&ps=&fmt=35