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shao
Supreme tranceaddict



Registered: Nov 2002
Location: Fresno, CA
filesizes when coverting to mono?

I noticed that when you covert a stereo WAV file to mono, it halves the filesize. When i tried doing the same thing for mp3 and ogg, I noticed no difference in filesize at all. Could someone explain the reason?


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Old Post Jun-17-2003 00:53  United States
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jon
Respect Mah Authoritah



Registered: Nov 2001
Location: Leeds

mp3+ogg are compressed audio, one of the things the compression process does is to look for similarities with the left and right channel and merge these together, and if there are any unique sounds to save these sepereatley. when it is decompressed (played) the program will reqcreate the individual chanels from the merged channel and add the unique sounds back to the chanels as well.


sorry if that sounds confusing its early morning and i cant think stright!


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Old Post Jun-17-2003 08:15 
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flystyler
Defected[JULES]Addict



Registered: Jun 2001
Location: Aylesbury, UK

What he is trying to say is that the file uncompressed will show a large difference in file size, but when compressed the difference is minimal. Due to the high level of compression on mp3s.


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Old Post Jun-17-2003 18:25 
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shao
Supreme tranceaddict



Registered: Nov 2002
Location: Fresno, CA

I see . I didn't consider that it would actually look for similarities in the two channels.


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Old Post Jun-17-2003 19:28  United States
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