On Wed, Feb 23, 2005 at 10:23:19PM -0700, Risto Treksler wrote: > Hi: > > For a given resolution, only a certain range of bitrates makes any sense!! > > According to the article which is about DVDs but applies to PVR-x50 cards too > http://www.mediachance.com/dvdlab/tutorial/bitrate.html > > For 352x480 MPEG-2 we will get: Min: 2500-2800, Average: 3300, Max: 4200 > For 720x480 MPEG-2 we will get: Min: 4800-5800, Average: 6400, Max: 8000 > > Note: > at 352x480, going past a bitrate of 4200 will not make it look any better > but will make a bigger file. > > I like to keep my recordings DVD compatable, > so that limits me to 720x480, 352x480 (and a few other resolutions) > > my Default profile is 352x480 @3500 (max 4000) -> 1.68 GB/h > my Low Quality profile is 352x480 @3000 (max 4000) -> 1.46 GB/h
The Tivo records at 352 x 480, and its "Best" rate is 3gb/hour which translates to about 6500. It's "high" bitrate is a touch over 2gb, or about 4500 if I remember correctly, and there is a difference, though not a big one, between them. So what gives? Is the chart wrong? Is Tivo wrong, or am I wrong about their bitrates?
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