Trying to capture from two seperate audio sources during video capture

Discussion in 'Amateur Video Production' started by ATJaguarX, Nov 4, 2005.

  1. ATJaguarX

    ATJaguarX Guest

    I have a Dazzle DVC80 and I am using it to capture video/audio from a
    source. This works fine, but at the same time, I want to plug a mic
    into my computer and record my voice while the video is being captured.
    I cannot add my voice later because the video/audio source is a live
    feed and I will be adding my own comments during the live feed.

    The problem is that both Windows Movie Maker and Sony Vegas Video
    require you to pick only one audio source during capture. In this
    case, I have to choose either the Dazzle audio or the microphone audio.

    Anyone have an idea how to do this?
     
    ATJaguarX, Nov 4, 2005
    #1
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  2. ATJaguarX

    Ken Maltby Guest

    So are you "capturing" to a file? or "streaming" to a network?
    Do you plan to mix your voice and the video's audio so that the
    video's audio is muted when you speak?
    Why not feed both audio streams to a mixer before sending
    the mixed audio to your capture/streaming card?

    Luck;
    Ken
     
    Ken Maltby, Nov 4, 2005
    #2
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  3. Does your computer also have a conventional sound "card"
    (sometimes built into the motherboard, etc.)

    Is your computer beefy enough to run your current audio/video
    capture solution PLUS run a second audio recording application
    (like Audacity, etc.)? That is what my first cut solution would be.
     
    Richard Crowley, Nov 4, 2005
    #3
  4. ATJaguarX

    ATJaguarX Guest

    I am capturing to a file (avi). This is the default capture format for
    Vegas video. I then render to wmv.

    No, I do not plan on muting the video's audio while I'm talking. Think
    of a NASCAR race and people commentating. You still would want the
    sounds of the cars driving by as the commentators talk. In essence,
    that's what I'm trying to do.

    I have thought about sending both streams to a mixer, but I'm trying to
    keep my costs down if it is possible in the software instead of doing
    it in hardware.
     
    ATJaguarX, Nov 4, 2005
    #4
  5. ATJaguarX

    ATJaguarX Guest

    The computer that I am attempting to use... yes and no. My computer is
    a laptop that does not have a "line-in". It only has the mic in and
    headphone jack.

    It should be powerful enough to do everything. It's a 3.2 ghz with 1.5
    gig of RAM.

    I have thought about running a second audio recording (already have
    Audacity installed), but I'm trying to do it all in one step. I'm
    trying to avoid having to add a secondary audio stream in later.

    I will be capturing clips from a live source in 10 minute increments
    (approx). So, I really dont want to have to:

    1. Start Video/Audio capture
    2. Start secondary audio capture
    3. Stop Video/Audio capture
    4. Stop secondary audio capture
    5. Mix secondary audio capture in
    6. Goto step 1

    Think again, to a NASCAR race. I would stop the capture during
    commercials and have to restart again once the commercial was over.
    So... after the 3 hour race is over, I would have 15 clips (commercial
    free) and would have to then add my voice over later. To complicate
    this, the NASCAR race would already have other commentators that I
    would have to try to sync mine in with (can't have them respond to one
    of my questions before I ask it).

    A typical day would have approximately 15 (10 minute) captures and I
    don't want to have to stream a secondary audio stream in for each
    one... one at a time.
     
    ATJaguarX, Nov 4, 2005
    #5
  6. (Assuming this is in response to my suggestion.
    Mr. JaguarX removed all context, so we flying blind here.)

    Audacity should record from the mic input just fine, so
    no problem with not having a "line-in".
    Then it would appear that you have no choice but to feed your
    commentary audio into your Dazzle gadget. Your added sound
    track would be inextricably linked if you mixed the sound from
    your source with the live microphone. An alternative might be to
    feed the source into one channel, and your live mic into the other
    channel (assuming you are recording stereo, and that the source
    will not suffer from being reduced to mono.)

    Then all you have to do is get a microphone up to line level to
    feed into your Dazzle dongle. Of course, by the time you get
    something with a mic preamp in it, you might as well spring for
    a small audio mixer. I just saw one go on eBay for <$20 and
    new at Radio Shack for <$40.
    Since we don't know your entire workflow, not clear how step 5
    works. And it would be unlikely that it could be done during
    commercial breaks in any case. Also not clear how you will
    cleanly identify the in- and out-cues for the commercial breaks
    on-the-fly unless you have some kind of insider information, or
    it is OK if your program is pretty rough around the edges.
     
    Richard Crowley, Nov 5, 2005
    #6
  7. ATJaguarX

    Ken Maltby Guest

    150min., yeah that 2 1/2hours would really tax your attention
    span, wouldn't it.

    You could try GraphEdit. Start a capture with the same
    setup you would use for your project. Then use the "Connect
    to Remote Graph" under the "File" tab. If it builds a graph,
    you should be able to add a "filter" to mix two audio pins.

    It is quite possible that your setup isn't able to make a graph.

    But you should be able to find a 4 channel mixer for $25, and
    that would be the easy way.

    Luck;
    Ken
     
    Ken Maltby, Nov 5, 2005
    #7
  8. ATJaguarX

    ATJaguarX Guest

    The audio would have to be added in later. For example, if I was to
    record 15 video captures, i would name them 1-15. I would then added
    audio mic captures 1-15... and would add them later matching up the
    names.

    I am not concerned about how clean the breaks are... I am only using
    NASCAR as an example.... as with the commercials as well.

    I would just need to be able to time the captures to start at
    relatively the same time so that syncing them up later wouldn't be too
    difficult.
     
    ATJaguarX, Nov 5, 2005
    #8
  9. ATJaguarX

    Alpha Guest

    Exactly.
     
    Alpha, Nov 5, 2005
    #9
  10. ATJaguarX

    Alpha Guest

    You can't do what you want without a mixer. Why do people expect miracles?
    Do they expect the ether to transfer data?
     
    Alpha, Nov 5, 2005
    #10
  11. It is not impossible to do that completely in software.
    But the market for a product like that is so microscopic
    that we are unlikely to see anybody willing to write such
    a thing.
     
    Richard Crowley, Nov 5, 2005
    #11
  12. ATJaguarX

    ATJaguarX Guest

    I'm not expecting a miracle, I figured it was a pretty basic feature
    (be able to capture from two audio sources).

    I'm trying to keep my costs down and was hoping that if it was
    available in a piece of hardware (mixer) that it would be available to
    me in software.
     
    ATJaguarX, Nov 7, 2005
    #12
  13. ATJaguarX

    ATJaguarX Guest

    I can see that...
     
    ATJaguarX, Nov 7, 2005
    #13
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