Apparently, _Brendon Lloyd Higgins_, on 24/06/05 00:56,typed: > H. S. wrote (Friday 24 June 2005 8:23 am): > >>While making a backup a music CD, I noticed that I am getting around >>728MB of wav files from the original. > > > If I understand the process correctly, this is entirely normal. You see, a > given CD can either have up to 700MB of data or up to 80mins of audio. But > 80mins of audio equates to 807.5MB of data! > > The reason for this is that in data mode a whole bunch of error-checking data > is interspersed with the real data on the CD, and naturally the > error-checking data takes up space. In audio mode this error-checking data is > considered unnecessary and is not used, freeing space for more audio. If you > were to add in the same error-checking to an audio CD you'd lose more than 10 > minutes of available audio time. > > The quality flag of cdda2wav probably has no relation to the file size. WAV > is > a raw, uncompressed file type, so the size of a wav file for a given duration > of audio is exactly predictable, (44100 samples/sec, 2 channels, 2 > bytes/channel/sample. The size in bytes is then 44100 * 2 * 2 * duration in > seconds.) If you want something smaller you'll have to look into some sort of > compressed format. If for your purposes a lossy format is adequate, I'd > suggest Ogg Vorbis. Otherwise, FLAC might be good (though it is larger than > Vorbis, they're both smaller than WAV). > > Hope that helps, > Brendon
Your informative reply and this page: http://linux.math.tifr.res.in/manuals/text/xcdroast.txt helped me clearly understand what is going on in audio CD writing. After going through this information, I was confidently able to back up a few of my audio CDs which gave me wav files amounting to more than 700MB of data. Many thanks for your nice explanation. ->HS -- Please remove the underscores ( the '_' symbols) from my email address to obtain the correct one. Apologies, but the fudging is to remove spam. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
