ex:
MPEG-1 pel_aspect_ratio Codewords
Height / Width, Example Aspect Ratio, Code
1.0000, square pixel ,0001
0.7031, 576-line 16:9 ,0011
0.8437, 480-line 16:9 ,0110
0.9157, 576-line 4:3 ,1000
1.0950, 480-line 4:3 ,1100

MPEG-2 aspect_ratio_information Codewords
SAR, DAR, Code
1.0000, – ,0001
– ,3/4, 0010
– ,9/16, 0011
– ,1/2.21, 0100

MPEG2 Aspect_ratio_information
This 4-bit codeword indicates either the sample aspect ratio (SAR) or display aspect ratio (DAR) as shown in Table 13.9.
If sequence_display_extension is not present, the SAR is determined as follows:
SAR = DAR × (horizontal_size / vertical_size)
If sequence_display_extension is present, the SAR is determined as follows:
SAR = DAR × (display_horizontal_size / display_vertical_size)