MPEG-4 is better quality than MPEG-2 at the same bit-rate. Although Blu-ray does use MPEG-2 sometimes, many discs are MPEG4. So an acceptable bit-rate with MPEG-2 is between 16-20 depending on the content, where MEPG-4 is between 6-10.
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see I thought lower bitrates meant lower quality. That's whats confusing because Blu-ray uses Mpeg2-TS, which uses a higher bitrate of 40Mbps.
MPEG-4 is better quality than MPEG-2 at the same bit-rate. Although Blu-ray does use MPEG-2 sometimes, many discs are MPEG4. So an acceptable bit-rate with MPEG-2 is between 16-20 depending on the content, where MEPG-4 is between 6-10.