On Friday 04 January 2008 04:39, James Knott wrote:
jdd wrote:
Carlos E. R. a écrit :
...
wav (or flac) files are nearly losless
Make that "completely losless".
I know that's said, but I doubt it's real. Once wav file done, the copy have no more problem, but I'm not sure that the wavs file made by two different apps from the same track will be exactly the same.
I don't think the real meaningfull content is different (the music), but the beginning of the track, the inclusion or not of the 2s silence track... all this is not clear (However I didn't experiment this - yet)
jdd
Assuming they're using the same track, the .WAV files should be identical. The CD is already digital. It's a stream of data that shouldn't be changed, when copying to a file.
If the extraction is done digitally and all the media errors are correctable, that's true. If the conversion is done from the analog stream (very unlikely on modern CD drives), then there will be variations in the quantization. Keep in mind that there are two different kinds of error correction for CDs. The kind used for data is very robust. The kind used for audio sectors is much less so (and more of the bits on the sector are devoted to audio sample data). Extraction ("ripping") software varies in how it handles reported errors. Some try very hard (as in using retries) to get error free data. Others take whatever they get. As far as the FLAC compressions scheme, it is just as lossless as that used by BZip2 or GZip or PKZIP. The data that comes out is precisely (bit for bit) what went in. Randall Schulz -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org