wow - 81 views and no responses. so does that mean we really don't know anything about ranking AC3 audio quality?
Mp3 is excluded from the MPEG-2 spec (presumably b/c timing - AC3 was more mature at the time).
But more interesting is that mp3 is also excluded from the Blue-ray spec, while AC3 is included.
Sonic Foundry Soft Encode (Dolby V6.6.2) Soft Encode V1.0:Castanet 2.0 Wav>AC3, 100% instantly ABXable up to 224Kbps. ABXable at 256Kbps, but not instantly.aften V0.0.8:Castanet 2.0 Wav>AC3, 100% instantly ABXable up to 320Kbps. Most likely ABXable at 384Kbps but not instantly.ac3enc (Used by BeSweet) (from ffmpeg) V1.20 (18-02-04):Castanet 2.0 Wav>AC3, 100% instantly ABXable even at 256Kbps. Couldn't test higher.
Not only AC3 is a bad codec but it is an awfull codec.I made some tests on the castanest sample long ago, the results were that is was a terrible codec, & in fact one of the worst codec around. I don't have them anymore but I think the ABX logs are lost somewhere deep in the forums.
You can use relatively high bitrates on Bluray since you're not hurting for space.
DTS ------ 5.1 1536Kbps /5x2= 2.0 614Kbps Good, most likely near transparent.DTS ------ 5.1 0768Kbps /5x2= 2.0 307Kbps Not Good, not transparent, most likely easyly ABXable.AC3 BD --- 5.1 0640Kbps /5x2= 2.0 256Kbps Not Good, not transparent, most likely easyly ABXable.AC3 HD-DVD 5.1 0504Kbps /5x2= 2.0 201Kbps Bad, not transparent, instantly ABXable.AC3 DVD -- 5.1 0448Kbps /5x2= 2.0 180Kbps Bad, not transparent, instantly ABXable.
You can hardly rip a blu-ray with a mono-core barton sempron 3000+ so I gave up anyway.
AC3 generaly is afwull comparing to the AAC, DD+, MP3 (in stereo), and other losssy encoders, but not DTS! even at 1.5mbps. My ears clearly prefer AC3 at 640kbp at any DTS lossy (not DTS HI-Res)
Isn't DTS Hi-res just the same as DTS except with more channels and higher bitrate? IIRC its backwards compatible
As far as I can remember, the PS3 initially didn't decode DTS-HD. It had to get an update for that. Only the new Slim can bitstream the "HD" codecs. In the PC software domain, the situation is pretty bad still. PowerDVD 8 supported at one point 7.1 DTS-HD MA, but some builds later it all got screwed up, and on PowerDVD 9 they stopped supporting it at all. People say it's come back but meh, I don't care anymore. WinDVD 2010 can't decode any 7.1 audio at all, though I solve that by bitstreaming with the ATI 5770.In short, the bluray spec is an unfinished mess. HD-DVD was better in almost everything except for capacity (which as an "advantage" was overblown and now makes for pretty bloated discs). Even if it supported the same audio codecs, it seems codec usage was more organized.