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Home: Video University Forums: Tech Q & A:
SD version 2.0?

Justin Rank
User

Feb 13, 2006, 7:42 PM

Post #1 of 2 (624 views)
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SD version 2.0?	Can't Post

Here's the question. Since HD-DVD is a year or two away and uses nearly the same mpg2 streams that SD uses, will there be a way to make a SD HD-DVD? In other words, I record to SD to miniDV at ~13gb/hour. Will HD-DVD allow me to break the 9000 bitrate roof of SD DVD's and use something like 15000? If so, then we can get a better quality SD image without having to compress the heck out it to get it to fit on a standard dvd.

videobear
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Feb 14, 2006, 10:23 AM

Post #2 of 2 (613 views)
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Re: [Justin Rank] SD version 2.0? [In reply to]	Can't Post

You can't compare MPEG2 and DV bitrates, because they are two completely different compression schemes.

DV uses an intraframe compression of about 5.5:1.
MPEG2 uses an interframe compression scheme. It compresses I frames in much the same way as DV, but then goes on to record only the things that have changed since the last I frame for several following frames. This drastically reduces the data, which is why you can get great looking images at 6.5 mb/sec (vs. DV's 25 mb/sec).

HD-DVD and Blu-Ray do use higher data rates than SD DVDs. However, I'm not at all sure that recording SD video to these formats at bitrates higher than 9 mb/sec will result in an improved image.

Regards,
Doug Graham
Panda Productions