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> First Look: Apple Lossless Audio, Apple
_news_
posté mer. 5 mai 2004, 04:40
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First Look: Apple Lossless Audio
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_Dan_
posté dim. 9 mai 2004, 03:36
Message #2





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For the vast majority of recording/passable lossy format combinations, nobody is able (even with the best equipment) in double-blind testing to reliably tell which is the high-bitrate lossy encoded version and which is the lossless version. That isn't to say that there isn't a difference or that absolutely none of the extra information preserved is audible to any listeners, but still, for one-time listening purposes, if the compression rate matters at all, you're generally better off to use a lossy format.

The primary advantage of a lossless codec - just like a lossless graphics format- is that it can be edited or reencoded without creating noticeable artifacts. If you are saving a photographic image for people to view on a bandwidth-sensitive web page, you will probably want to save it as a lossy jpeg- but you had better keep the much larger png, raw, or tiff lossless version of it around in case you ever want to edit it, resize it, save it as a different lossy format (jpeg2000?) which can achieve better compression, etc. Otherwise you will find that both the compressibility and image quality decline sharply. One oversimplifing and probably slightly misleading explanation: Any tiny difference for or in the lossy compressor will change which data it attempts to preserve and which it discards, and in a lossy file there's no way to tell what information is from the original image or recording and what is an artifact of the compression scheme. Likewise, for putting on your portable player, good lossy codecs such as AAC or Vorbis are your best bets- but you want to keep a lossless copy around in case you ever want to edit it, re-encode it, or whatever else.
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Les messages de ce sujet
- news   First Look: Apple Lossless Audio   mer. 5 mai 2004, 04:40
- - proudestmonkey   Where there is a lot of layering in a song, I thin...   mer. 5 mai 2004, 04:40
- - h. hey   heynessone@yahoo.com The real question for anyone...   mer. 5 mai 2004, 15:01
- - peterkirn   Yes, I think that's a good point. But that...   mer. 5 mai 2004, 15:46
- - LikeANice1903   I read the claim that few could hear the differenc...   dim. 9 mai 2004, 05:51
- - thornrag   QUOTE (LikeANice1903 @ May 9 2004, 05:51)I re...   mer. 12 mai 2004, 21:15
- - stink   "Duran Duran's "Planet Earth" (...   sam. 29 mai 2004, 22:08
- - Ingimar   Ok, I work as an sound technician in Iceland, and ...   lun. 12 juil. 2004, 18:13
- - Guest   QUOTE (Ingimar @ Jul 12 2004, 18:13)Ok, I wor...   lun. 19 juil. 2004, 02:55
- - stink   none of my audio apps support lossless files (or d...   lun. 19 juil. 2004, 03:03
- - Particle?   I may be out of place here, because you guys are s...   jeu. 29 juil. 2004, 07:56
- - stink   again, I encode in AAC for my iPod and iTunes. Any...   jeu. 29 juil. 2004, 10:01
- - Syzygies   Anyone old enough to remember dot matrix printers?...   ven. 30 juil. 2004, 12:00
- - Future Ipod Mini Owner   Which sounds better: Apple Lossless or 320 KBPS hi...   sam. 31 juil. 2004, 04:01
- - Presto   This is a bit late to answer FIMO. Anyway, if you ...   mar. 14 sept. 2004, 21:29
- - Presto   QUOTE (Guest @ Jul 19 2004, 03:55)Now I use t...   mar. 14 sept. 2004, 21:43
- - Brian Boru   Hi, I am a self confessed hifi nut having spent a ...   ven. 8 oct. 2004, 10:07
- - johnnernie   I have just conducted a listening test on a select...   dim. 10 oct. 2004, 03:11
- - johnnernie   Big blush... (much embarrassed) when reading AAF r...   dim. 10 oct. 2004, 03:57
- - editbrain   aaf is "advanced authoring format" used...   dim. 10 oct. 2004, 08:22
- - pain   Am I wrong or is ALE (Apple Lossless Encoding) the...   lun. 15 nov. 2004, 09:31
- - nutmilk   At my company we HATE how Sound Ideas' General...   lun. 3 janv. 2005, 19:26
- - sethjacquay   Does anyone know how Apple Lossless compares with ...   lun. 3 janv. 2005, 19:43
- - DougG   The question no one has directly answered is.... A...   lun. 21 févr. 2005, 05:31
- - Mark Tucker   I am not sure about the apple lossless audio, but ...   lun. 21 févr. 2005, 20:52
- - reddish   ummmmmmmm 303 .aiff songs on my 30 gig iPod but th...   mer. 23 févr. 2005, 11:43


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