On Mon, Mar 10, 2008 at 11:21:24AM +0100, Andreas Öman wrote: > Mike Melanson wrote: > > > Just curious, what have you done for testing and validation? Does it > > "pass" the conformance suite (to within reasonable PSNR)? > > Just conducted some tests, on some streams it seems ok, on others > not. These are al00_48 to al05_48. > > stddev: 0.70 PSNR:99.34 bytes:716800 > stddev: 0.69 PSNR:99.43 bytes:786432 > stddev: 0.69 PSNR:99.42 bytes:786432 > stddev: 0.69 PSNR:99.43 bytes:786432 > stddev: 19.86 PSNR:70.36 bytes:786432 > stddev: 30.43 PSNR:66.65 bytes:1417216 > > So, there seem to be some kind of issue still lingering. > I've also discovered that it outputs the samples inverted. > This should be as well fixed I guess. > > I've only tested the last one with FAAD (there seems to be > some kind of bug in faad/ffmpeg integrations making it always > output stereo, the first 5 streams are mono) > > stddev: 0.70 PSNR:99.36 bytes:1417216 > > Apparently FAAD does the right thing. > > OTOH, if I compare the output from FAAD and aac.c using an AAC > stream from iTunes (this is what i've been used previously), > it looks ok: > > stddev: 0.05 PSNR:122.12 bytes:38842368 > > Probably, the reference streams is exercising some tool which is > not commonly used and where it might be some bug lurking. > I cannot tell any difference by just listening on the streams though. > > Either way, I'll have a look at it and come back when I know > whats going on ..
Some tool in AAC uses random(), this of course will not match between decoders. I dont know though if this is the cause of any of the above. [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB I know you won't believe me, but the highest form of Human Excellence is to question oneself and others. -- Socrates
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