Shift audio track vs video track using Windows Movie Maker - possible?

Discussion in 'Professional Video Production' started by newbee, May 21, 2005.

  1. newbee

    newbee Guest

    I'm using Windows Movie Maker version 5.1 on a new Dell WinXP Media
    Center, 3.4 GHz, 2 GB RAM system.

    I've successfully recorded video/audio from my analog VCR into my
    computer. The audio outputs of my VCR were Y-cabled not into the TV
    tuner card with the video cable, but into the computer's sound card,
    an SB Audigy 2ZS Audio (D8CO). The audio track appears in the "Audio"
    track when viewing the Timeline, not the Audio/Music track - I believe
    that's normal.

    However, the audio track is a split-second before the corresponding
    video.

    Question #1: how to shift that audio track very slightly and synch it
    up perfectly to the video? My guess is that WMM can't do it, so if
    that's the case, what is the best software to get that will do the
    job?

    Am not sure whether the video itself has an audio-shift problem. Am
    about to do more homework and find out whether it was the source,
    whether not going into the TV tuner card's audio IN made a difference,
    etc., but wanted to find out about WMM's audio-track-shifting feature
    regardless of this current problem.

    Question #2: How, using WMM, can audio be cleaned up using a different
    program (such as Cool Edit Pro) and then precisely pasted back onto
    the video track?

    It seems to me that WMM can't separate the audio track from the video
    track. Thus the audio track should be recording into a different input
    (mic?) so that it appears in the Audio/Music track, not the Audio
    track. Is that the best solution?

    If there's a better program, will it be able to read the .MSWMM files
    created by WMM or will the video have to be recaptured?

    Thanks for all suggestions...
     
    newbee, May 21, 2005
    #1
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  2. I think the problem you'll run into is this :

    You've captured and compressed the source video and audio in one step,
    into a format (windows media probably) which is fairly hard to extract
    the sources from. With an uncompressed AVI that would be relatively
    simple, but if you've made .wmv format then you're stuck mostly with
    microsoft tools.

    It *is* possible to extract the audio and video track separately. For
    example using windows media encoder with *exactly* the same settings
    you used to encode the file - in this way, the encoder will not
    recompress the stream on output.

    But then you'd have to either tag on a few hundred milliseconds of
    silence, before re-combining the audio and video, and re-encode it a
    second time. This will introduce generational losses.

    If you captured *really high* bitrate AV to .wmv format (say, using a
    DVD capture quality setting) , then you might get away with this
    approach, because VHS is quite compromised on quality.

    But I'm prepared to bet this is all going to be a lot of hassle, more
    than it's worth for the time, so my tip would be : re-capture the
    video, possibly in a tool such as VirtualDub (which can usually 'see'
    your capture card as a source)

    Then when you have the uncompressed AVI available (the file will be
    huge), work on the audio track shifting it by enough to re-sync it,
    again possibly in VDub.

    You might also find that due to system configuration, your sound card
    may capture out of sync with the video card, and the video capture
    card's input may prove a better way to keep the AV in sync.

    HTH
    Cheers - Neil
     
    Neil Smith [MVP Digital Media], May 21, 2005
    #2
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