Grand Test Audio: 9 codecs, 10 samples, 31 presets
Reply #37 – 2002-11-15 13:39:11
But I also wonder why you did not include the standard 64 kbps bitrate for mp3PRO (or 80 kbps, CBR or VBR), because that's where it's very good at, especially if you are also considering other codecs with low bitrates like AACEnc -tape or WMA9 VBR 25%. The higher you go with the bitrate in mp3PRO, the less you will gain in quality compared to other codecs that are meant to be used at ~128 kbps and above. This has to do with SBR and how it works and where it works best. I've discluded mp3pro at lower bitrates, cause there were lots of tests of this bitrate/codec.. And you have to remember, that by the start of our project the main target of it was the finding the best possible codec/bitrate for online games music, and mp3pro@64 is definitly not good for such purposes. Well, I only know two other tests with mp3PRO, and both did not use 64 kbps with VBR or even 80 kbps. I also wonder why you think that mp3PRO at 64 kbps "is definitely not good for such purposes" and at the same time consider to include PsyTEL AACEnc with the -tape preset, because I know for sure that this will sound worse than mp3PRO at 64 kbps. But if the main aspect of your test was to use codecs that have never been tested with certain settings before - OK... And I would like to know if you used the resampling option with both of the low PsyTEL settings. Because at these bitrates it is necessary to do this with -resample 32000, otherwise it will probably sound not too good, at least not as good as it could. Concerning AAC. You can check the strings for coding by moving the mouse cursor over the preset in the table. I used standart presets for AAC, so if there is no resampling in it by default, all files won't be resampled. I'm just a rookie - so I don't know lots of things out there That's OK, but maybe you should have asked here before... And the resample option is explicitely mentioned in the index.pdf within the complete PsyTEL package. By the way, using -profile 2 with AACEnc (which is no standard setting at all) had no effect in my recent tests, so I'm not sure if Long Term Prediction even works in v2.15, just like Intensity Stereo. But don't get me wrong, I think it's a good idea to "roll out" a listening test on a large-scale basis. I also would like to ask if you are planning to keep all of these files (800 MB) on your webspace server, so that it could be used as a library or archive for later (then with their correct names, perhaps)?