HDCAM vs MPEG-2 Long GOP
Our business currently moves video around as MPEG-2 Long GOP.
For high definition, one of my clients is insisting that we use a bitrate of 135Mbps. On further investigation, I found that they are insisting on this bitrate because this is the bitrate HDCAM uses, and supposedly HDCAM uses MPEG-2. I don't believe this is correct - but I'm having trouble finding information which disproves this theory. All I can find is that HDCAM uses intra-frame compression (does this mean it is I-Frame only?), while Long GOP (obviously) is inter-frame compression. It will cause us major headaches to use 135Mbps (none of our equipment goes past 80Mbps). Anybody have any info which can help convince our client otherwise? |
HDCAM uses DCT-based compression and it's only intraframe compression (which is similar to I frames only). It doesn't use MPEG2 compression, although MPEG2 is similar since it is DCT-based. Charles Poynton's book (see poynton.com) has a little bit of information on the HDCAM format.
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XDCAM uses MPEG-2 compression. In higher rates than HDV, but they only go up to 35MB/s. Still, many people choose that format and many networks accept it.
DVCPRO HD is 100MB/s...and yes, HDCAM is 135MB/s. |
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