At 09:41 PM 12/2/2002 +0530, [EMAIL PROTECTED] wrote:
Where did I go wrong? My understanding is approximate one is to ten compression of mp3 should compress the mono wav file of 5 MB to 0.5 MB isn't it ?normally when you compress an mp3, you aren't specifying a compression ratio, you are specifying a desired end size.
Please explain.
for CBR, the end file size is determined by the specified bitrate. (128K is usually the default) at 128kbps, your mp3 will be ~128 thousand bits per second of audio. if you want to achieve the same compression ratio with mono sound as with stereo, you need to compress using half the bitrate. (since there is half as much data to start out with) so, if you encoded your stereo file at 128kbps, you should encode the mono file at 64kbps.
by the way, this also means that if you had encoded your 10 MB stereo file to stereo mp3, you would again have ended with a ~1MB mp3.
as i said at the beginning, this is for CBR (constant bitrate) mp3. the same should apply to VBR except instead of changing the bitrate paramter, you need to change the corresponding quality paramter for VBR.
