How to keep audio and video sync all the time?

Discussion in 'Amateur Video Production' started by Paul D. Sullivan, Jul 20, 2003.

  1. I have a Matrox G400-TV card and use Windows 98 SE. I use the
    Matrox VCR software to capture video, usually in 352x240, using
    the MJPEG format supported in hardware by the G400-TV.

    My problem seems to be how to keep the Audio and Video in sync
    with each other, particularly when I save into a separate format
    after the MJPEG capture. Two hours of MJPEG takes like 12 gig,
    depending on audio resolution, so I need to save it in something
    like MPEG1.

    Is there any key to keeping the audio in sync with the video?
    The final quality is pretty good overall but with the video and
    audio out of sync, it just ruins the whole thing.

    I really would appreciate any help you can provide me with.

    Thank you,

    Paul
     
    Paul D. Sullivan, Jul 20, 2003
    #1
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  2. Paul D. Sullivan

    DeepOne Guest

    Try capturing with AVI_IO. http://www.nct.ch/multimedia/avi_io
     
    DeepOne, Jul 20, 2003
    #2
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  3. Wow, this thing works awesome with my Win 98 SE setup. It
    captures directly into MJPEG format, easily lets me choose the
    sound resolution I prefer and both of the clips I have tried with
    it are in audio sync. Is that audio/video sync enforced
    automatically? I can't seem to find any option for it in the
    setup.

    Next question is, now if I want to convert it from the MJPEG
    format to another, can it be done with this program?

    Thanks
     
    Paul D. Sullivan, Jul 22, 2003
    #3
  4. Paul D. Sullivan

    Patrice Remy Guest



    try a different soundcard.

    I use an old diamond mx200 card & there are no sync problems.
    This card also permits switching audio sampling rate (44.1khz/48khz).
    Useful for dvdr's.

    Soundblaster Live! cards also works without any sync problems.

    I had sync problems with ac97 onboard sound.

    You might want to try using a permanent swap file..twice the size of your ram.
    Also..try recording on a different drive or a different partition than your OS.
     
    Patrice Remy, Aug 10, 2003
    #4
  5. Paul D. Sullivan

    Markus Zingg Guest

    Keeping the audio in sync is one of the things that AVI_IO was
    Our marketing guys wanted to put the page more into the context of our
    firm. There were other people reordering the page and to be honest I
    was not all excited about it. Anyways, do you still have problems to
    access the site? The information you mentioned is still there - just
    differently formatted.

    Markus
     
    Markus Zingg, Aug 10, 2003
    #5
  6. Paul D. Sullivan

    DeepOne Guest

    The site is accessible now. I think I prefer the old format. :)

    BTW, it says you are working on support for "DV cards". Do you have
    any idea when that might be completed? I haven't been able to use
    AVI_IO (which I purchased) since I got a Canopus ADVC-100 although it
    worked well when I was using an Asus Deluxe video card for capture.
     
    DeepOne, Aug 11, 2003
    #6
  7. Paul D. Sullivan

    Markus Zingg Guest

    Cannopus is special in that they use proprietary drivers. Working on
    DV support is acutally boiling down to adding native DirectShow
    support. OpenDML 1.02 is another major change I'm workign on. These
    are the two main features of the next major release. I'm however still
    held terribly busy job wise and there is no short term change visible.
    To make the story short - don't hold your breath :)

    Markus
     
    Markus Zingg, Aug 11, 2003
    #7
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