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Reference - YouTube Resolution/Format Table: 

NOTE:
Below table is for reference only for people who are interested in YouTube technical details, normal user need not know it.

3GP
3GP 176 x 144 stereo 8KHz
3GP 176 x 144 mono 22KHz

NQ - Normal Quality
FLV 320 x 240 mono 22KHz MP3
FLV 320 x 240 mono 44KHz MP3
FLV 320 x 240 stereo 44KHz MP3

HQ - High Quality
FLV 480 x 360 mono 44KHz MP3
FLV 640 x 380 stereo 44KHz MP3
MP4 480 x 360 stereo 44KHz AAC H.264

HD - High Definition
MP4 1280 x 720 stereo 44KHz AAC H.264

Full HD - Full High Definition
MP4 1920 x 1080 stereo 44KHz AAC H.264