Otterman speaks... (2003-2007)
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Otterman speaks...

Cycling, macintosh, natural history and life in Singapore - Archives

List of Categories : travel * museum * cycling * Singapore Naturalist * science * kakis * mangroves * movies * mac and the internet * meow * NUS * life in Singapore * lit * world *

Thu 07 Apr 2005

Stitching mp3 files

Category : mac and the internet

Yesterday I recorded a radio interview of two friends of mine about Green Transport Day and cycling to work. I used Wire Tap as previously described.

The weakness of this system is the reliability of the internet connection - it keeps dropping in campus but is more stable at home. However, despite going home to record the interview, the connection dropped three times. So I ended up with three incomplete but high-quality audio segments of the interview.

Later, one of the interviewes, Chu Wa, sent me his mp3 recording of the interview. It was complete but was a low quality 48kbps recording with a slight buzz in the background. Since it was not music, I supposed it was useable.

Still, I wondered if I could salvage the high quality internet recording by splicing in the missing segements from the low quality track. Version Tracker lists a lot of software that probably allow many ways to accomplish this.

Since I already have Apple's Quick Time Pro (US$30) and Lukifer's mAC3dec (donationware), I found I needed only to download Oliver Wolff's Rejoiner (freeware) and temprarily turn off iTunes Preferences: Advanced: "Copy files to iTunes Music folder" to get the job done.

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 missing segment from the original low quality file using Quick Time Pro by placing slides at beginning and end of the desired segment and using the Edit: Trim function. Play the result to ensure the segment is accurately cut as the time guide is not a precise indication.
  2. Export the missing segment as a sound file; the default is AIFF.
  3. Use mAC3dec to convert the missing segment AIFF file to mp3; ensure in the options that the resultant bitrate is set to that of the other file. In this case, 128kbps; else the stitching software may not work properly.
  4. Place the tracks to be stitched into a new folder, and number them sequentially. Drag and drop the folder onto Rejoiner, and 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.

I uploaded the clips here here - and in the first clip, you can detect the hear the change in quality in last ten seconds. The dialogue is conserved so this works for me!

Posted at 1:23PM UTC by N. Sivasothi | permalink | , .