video/mpeg 4 false video/x-h263 0 10 12/11 16/11 simple 1/1 12/11 10/11 16/11 40/33 0 1 0b 2 3 4a 5 6 simple 0 0b 1 2 simple 0 0b 1 2 3 ltp 12/11 16/11 1/1 1/1 12/11 16/11 12/11 16/11 ltp