==== 11.8.1.1. Format Constraints ====
Format Resolution V. Codec V. Bitrate Sample Rate A. Codec A.... 52 kbps 44100 Hz MP2 224 kbps 25 4:3
[a] These resolutions are rarely used for DVDs because they are ... OP Size Constraints =====
DVD, VCD, and SVCD also constrain you to relatively low GOP (Group of Pic... R at 1152 kbps. This highly limiting constraint also comes along with an extremely low vbv buffer size
