bad luck mate, it's always good to see people willing to give something a go though :)
porl On 01/08/07, Gregory Alan Hildstrom <[EMAIL PROTECTED]> wrote: > > Hello again. I discovered a disappointing, to me, bug in > j2kaudio/libjasper today while I was > working on 32-bit audio support. > > My previous holy-grail-looking lossless audio compression test results > were incorrect. I was > passing rate=1 to the JasPer JPEG 2000 encoder, which was not performing > lossless compression, but > slightly lossy compression. I actually do not know what it was doing > because the behavior I was > getting is somewhat undocumented. I could not differentiate the quality by > ear; everything sounded > perfect to me. I only discovered this when I had to do sample by sample > checks for accuracy and I > found that they were very close, but not exactly the same. The results > matched exactly when I left > rate= out of the encoder options entirely, but the resulting file size > increased. I will post a > question to the jasper email list to find out what rate=1 should be doing > and why it does not > match omitting the rate. > > The new lossless results from my test song are: > la - 65.5% > ofr - 66.3% > ma - 66.9% > lpac - 69% > flac - 70.2% > shorten - 75.2% > j2kaudio - 76.6% (dead last) > bzip2 - 96.7% > gzip - 97.1% > > Thank you again for all of your feedback and input. I apologize for > getting anyone's hopes up and > for not performing a sample-by-sample check at the integer level sooner. > > For now, I think I have proved and improved the concept, but I conclude > that even though it > outperforms file compressors, other lossless and lossy audio compressors > are superior for audio > data. > > Updated tables and information: > http://geocities.com/hildstrom/projects/j2kaudio > > Thanks. -Greg > > Gregory Alan Hildstrom > Secure Systems Engineer - Trusted Computer Solutions > trustedcs.com > [EMAIL PROTECTED] > Software Engineer - Hildstrom Engineering > geocities.com/hildstrom > [EMAIL PROTECTED] > Mobile:(210)413-6082 > Fax:(210)599-0469 > Office:(210)340-3151x117 > _______________________________________________ > Linux-audio-dev mailing list > [email protected] > http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev >
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