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You are here: MacNN Forums > Our Archives > General Archives > Digital Video & Audio Archives > Quicktime MPEG1 Muxed Soundtrack

 
Quicktime MPEG1 Muxed Soundtrack
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Fresh-Faced Recruit
Join Date: Oct 2000
Status: Offline
Feb 2, 2003, 07:19 AM
 
I'm working with some old mpg videos with audio and video that play fine in QuickTime. When I open or import them into iMovie, there is no audio track. The option for extracting the audio track in QT is disabled as well. The audio plays fine when I open the files in iTunes.

My ultimate goal is to use iDVD to create a DVD, but iDVD won't recognize the files at all even though they are QuickTime files.

Help!!!

TIA - DVryce
     
Nap
Junior Member
Join Date: Oct 2002
Status: Offline
Feb 2, 2003, 09:28 AM
 
Mpeg multiplexed (Muxed) files have the video and sound combined in one stream. QT does not by itself demux such files and will only export the video portion. To preserve the sound you will have to find (on VersionTracker) a freeware program called BBDemux. While there, also find another freeware program called SoundApp. Run BBDemux. You will wind up with two files; a video file with a m1v extension and a sound file with an m1a extension. Use SoundApp to convert the sound file to AIFF. Open both this file and the video file in Quicktime, copy the sound data to the clipboard, switch to the video file document, be sure the time slider is at the far left, and then use Add Scaled from the Edit menu to add the sound to the video. You now will be able to export both sound and video to the formats of your choice. If you are going to edit and recode in another application you should use a lossless video compressor such as component video, none, or animation for the video compressor. If file size is a factor you can also try MotionJPEG A set for 100% and single field.
     
Addicted to MacNN
Join Date: Nov 2002
Location: Seattle, WA
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Feb 2, 2003, 12:53 PM
 
you might also like to know that SoundApp is Classic only, but that iTunes can convert m1a and m2a audio files if you first change the filename extension to mp2 or mp3 and delete the filetype/creator codes (or change them to MPEG/hook)
     
DVryce  (op)
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Join Date: Oct 2000
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Feb 2, 2003, 04:44 PM
 
That did it. Thanks!
     
 
   
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