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Why did Sony choose bitrates of 18, 25 and 35 Mbps?

April 26, 2017bitrates Mbps Sony

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Why did Sony choose bitrates of 18, 25 and 35 Mbps?

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Because MPEG2 includes both interframe and intraframe compression technology, it can offer higher quality at lower bitrates than intraframe compression alone. The XDCAM HD system uses 18 Mbps and 35 Mbps variable bitrates, plus a 25 Mbps constant bitrate. These rates offer decisive advantages in cost, recording time and compatibility. For example, the XDCAM HD system offers the longest recording time currently available in an HD camcorder: over 120 minutes at 18 Mbps. And thanks to the low bitrates, XDCAM HD recording is compatible with just about any NLE that works with 25 Mbps.