Multiple Channels in iMovie

Discussion in 'Mac Apps and Mac App Store' started by thatsmyfish, May 17, 2014.

  1. thatsmyfish macrumors regular

    Joined:
    Nov 20, 2009
    #1
    iMovie question - In my HTPC I have separate video files for episodes and commentaries in many cases. Is it possible to import the video into iMovie with both audio tracks and export a single file with two separate channels? I'm trying it and it seems to only play both tracks simultaneously.

    Thanks,
     
  2. Dave Braine macrumors 68040

    Dave Braine

    Joined:
    Mar 19, 2008
    Location:
    Warrington, UK
    #2
    The audio in iMovie is a single track. You can't separate the two channels.
     
  3. Brian33 macrumors 6502a

    Joined:
    Apr 30, 2008
    Location:
    USA (Virginia)
    #3
    By my understanding (which is quite limited so far), you can "multiplex" multiple audio "streams" with a video stream and save it in one "container" file (e.g., mp4, mv4, mkv, etc).

    When you play the movie, you should be able to select which audio stream you want. You can play any one at a time. Is that what you want?

    For example, a single .mp4 movie file can contain a 5.1 surround sound audio stream as well as a simple stereo audio stream, allowing the listener (or perhaps smart players) to pick the audio that matches the listening equipment.

    I know that the command-line tool "ffmpeg" can pull arbitrary video and audion and subtitle streams from multiple input files and multiplex them into one output file. However, there are about a million options and command line switches and it's not something you're likely to pick up in a few minutes. I've been slowly trying to figure it out for my own uses.

    There are lots of other tools that "mux" and "demux" media files, although I don't know of a GUI one right now...
     
  4. Brian33 macrumors 6502a

    Joined:
    Apr 30, 2008
    Location:
    USA (Virginia)
    #4
    Just wanted to add that re-multiplexing the file should only take about as long as it takes to read and write the file. There's no need to re-encode the video stream, for example, which takes much, much longer.
     
  5. Dave Braine macrumors 68040

    Dave Braine

    Joined:
    Mar 19, 2008
    Location:
    Warrington, UK
    #5
    Not with iMovie.
     

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