On Fri, Jun 07, 2002 at 08:30:23PM +0200, Kristian Peters wrote: > Martin Wolters <[EMAIL PROTECTED]> wrote: > > I expect about 1200 - 1230 added zeros at the beginning. The number of > > added zeroes in the end can vary. There is a finite number of > > possibilities from the mp3 algorithm (like for the beginning), plus a > > number of zero padding samples that is depend on the size of the > > original wav-file. (In order to fill up frames). > > Oh.. Not only zeros are added at the beginning. I calculated that 9024 bytes are >added by mpg123. (It's not easy to determine that cause the output differs.. But I >hope the number is correct.) > > 9024 / (channels) / sizeof(bits) == 1128. > > (I used a 16bit stereo wav.) > > I'll test other decoders. Hopefully that one will not vary. > > Thanks, *Kristian > > :... [snd.science] ...: > :: _o) > :: http://www.korseby.net /\\ > :: http://gsmp.sf.net _\_V > :.........................:
When I was doing some codec analysis, I found it necessary to find the maximum of the cross-correlation of the source and destination files and zero-pad the files to align them. A little more work to setup your test, but it fixes that kind of problem automatically. Regards, Mark mark.rages.net
