How to change soundtrack on DVD?

Discussion in 'Amateur Video Production' started by stankley, Dec 22, 2004.

  1. stankley

    stankley Guest

    I made a DVD from 2 AVI files (each 45 mins long). I'd converted the
    AVIs to separate MPEG2 video and AC3 audio files, and authored the DVD.

    Subsequently, and after deleting the source AVI and video files, I
    realized that I'd messed up and put the same AC3 file with both video
    files. So now I have both AC3 files, and the DVD.

    I can't figure out a way to replace the audio on the DVD with the
    correct AC3. I tried using Vobedit, to demux the audio and video
    streams from the VOB files. The result of this is one huge MPEG2 + one
    huge AC3 file. I could probably figure out a way of splitting the
    MPEG2 file, but the chances of syncing the audio with the video will be
    nil.

    Anyone have any good suggestions here?
     
    stankley, Dec 22, 2004
    #1
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  2. You should have used Linux transcode.
    It is of cause possible to remux the ac3, see tcmplex-panteltje on my page:
    http://panteltje.com/panteltje/dvd/
    or you can use mplex from mjpegtools.
    What makes you think timing has changed?
    If no frames were dropped it should still be OK?
     
    Jan Panteltje, Dec 22, 2004
    #2
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  3. stankley

    stankley Guest

    I'm not saying the timing is changed - what I'm suggesting is that I
    chop the MPEG2 (created by Vobedit) in the middle, to create 2 separate
    ..m2v files, then reauthor with the 2 ac3 files, it's highly unlikely
    that my chop will have been frame-perfect, so that the 2nd part of the
    movie aligns exactly with the 2nd ac3 file.
     
    stankley, Dec 22, 2004
    #3
  4. stankley

    stankley Guest

    I'm not saying the timing is changed - what I'm suggesting is that I
    chop the MPEG2 (created by Vobedit) in the middle, to create 2 separate
    ..m2v files, then reauthor with the 2 ac3 files, it's highly unlikely
    that my chop will have been frame-perfect, so that the 2nd part of the
    movie aligns exactly with the 2nd ac3 file.
     
    stankley, Dec 22, 2004
    #4
  5. stankley

    Ken Maltby Guest

    You might try TMPGEnc DVD Author (TDA), using its
    "Add DVD video" button. First, you may be able to select
    (and therefor separate) each of your original MPEG clips as
    a "Title". You would ignore the Audio at this point.

    If only one "Title" is listed, you could still use the "Reading
    chapter information" feature and have TDA "Copy the clip
    video to the HDD" as a sequential listing of .mpg files in the
    "Copy destination folder" you specify.

    If you had two separate "Titles", then you would just replace
    the audio file listed with the appropriate AC3 file. Note: Unless
    you have bought their AC3 plug-in (for any of their products)
    you will not hear the audio while authoring the new DVD but
    the audio will be correctly placed on the output of TDA.

    Also: the audio and video settings areas appear "Grayed out"
    but you can still "Browse" and replace what's listed.

    If you only had one "Title" listed, delete "Untitled track 1"
    then click on the blue "Add new track..." text, to bring up a
    new source page. Now use the "Add file" button and go to
    the "Copy destination folder" and select the files that go with
    your first MPEG. As you described it, this audio and video
    should be normal. Now, click on the blue "Add new track..."
    text again and use the "Add file" button to select the .mpg
    files for your second MPEG; only this time you would
    replace the audio listed with the appropriate AC3 file.

    It is highly likely that you will have to merge the second
    group of .mpg files so that your audio can match properly.
    If that's the case you may be able to replace the audio
    during that process. If not, you will still be able to specify
    your AC3 audio when you "Add file" the merged .mpg.
    There are a number of tools to merge/join .mpg files, I like
    VideoReDo www.VideoReDo.com .

    Luck;
    Ken
     
    Ken Maltby, Dec 22, 2004
    #5
  6. What makes you think timing has changed?
    OK, I see, I have never used vobedit.
    Worse even, I have no utitlity I think at hand to accurately cut ac3.
    If vobedit cuts at a frame (and it MUST), and you are in Europe, it is
    40mS increments, in the VS 1 / 29.?
    In Europe most DVD players will accept mp2...

    Still if vobedit works the right way, its should cut the ac3 at the right
    point.
    the first ac3 file wil be OK (just the start of the movie).
    In tcmplex-panteltje you can specify a start delay (and so shift the audio
    versus the video) and that way, if it was not right, align the second part.

    Why not try to remux the 2 files and see if they are perhaps OK?
    Only takes 5 minutes ....
    If problems keep persisting, one could decode the ac3, use wave editor,
    recode.. will give quality loss.
    Or cut the ac3 on an audio frame that is close just before the splice,
    and a part a few frames after the splice, decode the part covering the
    splice for a couple of frames, work on that with a wave editor.
    I have made many a production with calculator and a zillion sound utilities,
    all handwork, and no way can you notice it.
    I am glad I am in Europe, as .04 seconds is so easy, not sure if I'd pull
    that of with US material.
     
    Jan Panteltje, Dec 22, 2004
    #6
  7. stankley

    stankley Guest

    Ken Thanks! DVD author worked flawlessly here. I added the 2 titles,
    changed the audio to the .ac3 file, created a new menu, and it worked
    perfectly.

    I have to say DVD author is a bit crap! It's very limited when
    compared to programs like DVD-Lab, but does have this somewhat unique
    feature of importing DVD files - I haven't seen that with any other
    authoring program.
     
    stankley, Jan 4, 2005
    #7
  8. stankley

    WEBPA Guest

    DVD Lab directly imports *.vob files from DVDs, provided they are not
    encrypted.

    From there, you can do anything you want with them.


    webpa
     
    WEBPA, Jan 4, 2005
    #8
  9. stankley

    stankley Guest

    Well bugger me backwards - I didn't know that. I'll keep that in mind
    next time. Thanks for the tip.

    DVD-Lab is a tremendous program - hats off to the small company that
    built it. As far as I can tell, it's one smart guy in Eastern Europe
    who's done it single handedly. And it beats the pants off virtually
    everything out there.
     
    stankley, Jan 5, 2005
    #9
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