> > 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?
If you look at the chart for 352x480, 6500 gives "Good" quality, so tha chart and Tivo seem to be in sync. Not sure why you think they're wrong. Regards, Phill
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