The URL, http://www.mediachance.com/dvdlab/tutorial/bitrate.html is fascinating!
My baseline is that I'm used to watching VHS tapes in EP mode. (OK.. I'm showing my age -- I grew up watching fuzzy OTA from an outdoor mast VHF/UHF antenna.) I record analog SD as MPEG-4 at 432x480, 2 Mbps. If I take that chart and assume that MPEG-4 needs half the bitrate of MPEG-2 (for the same quality) and that bitrate scales linearly with frame size, I get the following bitrates For LP quality 2.7 Mbps / 2 * 432 / 352 = 1.7 Mbps For SP quality 2.9 Mbps / 2 * 432 / 352 = 1.8 Mbps For XP (?) quality 3.8 Mbps / 2 * 432 / 352 = 2.3 Mbps All of this is assuming CBR. I *assume* MPEG-4 is VBR, so I'm probably in good shape (I *assume* when you provide at bitrate, that's the average). Of course, the VHS tapes are SIF at 352x240, I'm at least getting 432x480. OTOH, I do see artifacts (blockiness) in dark areas. But, my criteria all along was to keep it under 1 GB/hr. I record a *lot* of stuff. Steve __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
