On average what level of compression are you seeing? I know there are
many factors, but for space planning I'm looking for a general
estimate.
Pat
On Mar 6, 2005, at 8:04 PM, Phil Karn wrote:
Others have already pointed out that MP3 files are like any other kind
of computer file; as long as no errors occur during copying, the
copies will be exactly identical to the original. Only if you
decompress and recompress will there be any further degradation.
Having said that, let me make a plug for FLAC (Free Lossless Audio
Compression). Not only does FLAC not lose *any* quality from the
original PCM WAV format (the format on standard audio CDs) but the
FLAC header also includes a built-in MD5 hash of the uncompressed
audio. This lets you verify a FLAC file to ensure that it's not
corrupted. (You use the command "flac --test file.flac"). I don't know
of any other commonly used audio format with this *very* nice feature.
FLAC uses much more space than the lossy formats like MP3, Ogg Vorbis
and AAC, but modern disks are *so* roomy and cheap that this just
isn't a big deal anymore for a desktop machine.
I chose FLAC as my primary format on my Slimserver, and I can still
produce lossy compressed versions from the FLAC masters as needed for
various portable players.
Phil
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