Guides for novices
Stitching mp3 tracks
by Otterman

If you need to extract a segment out of one mp3 track, and need to stitch or join it to another mp3 track on a Mac OS X computer, you've reached the right place.

Here are the steps:

  1. Extract segment with QTPro
  2. Export (AIFF)
  3. Convert to MP3 with mAC3dec, at same quality as main track
  4. Stitch files with Rejoiner.

 
1. Extract segment with QTPro

Extract the missing segment from the original low quality file using Quick Time Pro:

  • Place the slides markers at the beginning and end of the desired segment.
  • Use the "Edit: Trim" function.
  • Play and listen to the result to ensure the segment is accurately cut. The time reference is not a precise indication.

 
2. Export (AIFF)
  • Export the missing segment as a sound file; the default is AIFF.

 
3. Convert to MP3 with mAC3dec, at same quality as main track

Use mAC3dec to convert the missing segment AIFF file to mp3:

  • Ensure that "Options> Resultant bitrate" is set to that to the rate of the other file. E.g. If this track is to be attached to another with a 128kbps bitrate, set the resulant bitrate to 128kbps. Else the stitching software may not work properly.
  • Drag and drop the file onto the mAC3dec window.
  • Click "Start".

 

4. Stitch files with Rejoiner.
  • Place the tracks to be stitched into a new folder.
  • Number the tracks in the sequence that you want them to be stitched or joined together.
  • Drag and drop the folder onto Rejoiner.
  • When prompted, provide a filename with an mp3 extension, e.g. "result.mp3" - I had problems opening a file without an extension for some reason.

You're done!