[directmusic] Mp3 encoded wav tracks...

  • From: "Jason Booth" <jason@xxxxxxxxxxxxxxxx>
  • To: <directmusic@xxxxxxxxxxxxx>
  • Date: Wed, 18 Dec 2002 10:08:00 -0500

        Ok - So I'm playing with the compression in Direct X 9 RC2's
version of Direct Music producer, and I've come across some annoying
problems that I can't seem to figure out for the life of me. The project
uses a series of 16 bar wav tracks with variations, with smaller loops
played as secondary segments over top of them. The problems I'm having
are as follows:

        - After run-time saving the files with "MP3 128kb" compression,
a small gap is placed 1 second into the file
                - This can be viewed in Soundforge, and always appears
in the same place.

        - The MP3 format adds a small amount of space to the beginning
of the file, which has several problems
                I should be able to use the offset to account for this
gap, however, I don't know what the offset should be. To figure it out,
I thought I could load both the original and encoded files into
soundforge, and examine the difference in length to find the offset.
However, both files load in having the exact same sample count; yet I
can clearly see a space in the front of the mp3 encoded version when
comparing them, and the end does not appear to be clipped. This has me
really baffled..
        - This time difference between the files causes my project to
slowly loose sync over time.

        Anyway, if anyone has experience using a lot of MP3 encoded wav
tracks, or knows what offset I should set, and why my files appear to be
exactly the same, yet drift in time, I'd appreciate the help..

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