Main Profile
Main Profile – A subset of the syntax of the MPEG-2 video coding specification that is expected to be supported over a large range of applications. MPEG-2 standard uses four levels which define picture resolution and five profiles which define the compression tools used. 1440 x 1152 1440 x 1152 1440 x 1152 60 Mbits/s 60 Mbits/s 80 Mbits/s I, B, P I, B, P I, B, P Main 4:2:0 4:2:0 4:2:0 4:2:0 or 4:2:2 720 x 576 720 x 576 720 x 576 720 x 576 Low 4:2:0 4:2:0 360 x 288 360 x 288 4 Mbits/s 4 Mbits/s I, B, P I, B, P (1) Simple Profile: Defined in order to simpify the encoder and the decoder at the expense of a higher bit rate. (2) Main Profile: Best compromise with current technology between rate and cost. (3) SNR Profile: A quality tradeoff is made against SNR performance. A low bit rate decoderwill have full resolution but will have lesssignal-to-noise ratio than a high bit rate one. (4) Spatial Profile: A tradeoff against spacial resolution. The low bit rate receiver produces a picture with less resolution than the full bit rate one. (5) High Profile: Intended for HDTV broadcast applications in 4:2:0 or 4:2:2.
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