Playback Fine on TV Monitor But Jerky on Computer Monitor

Discussion in 'Amateur Video Production' started by P.C. Ford, Sep 12, 2003.

  1. P.C. Ford

    P.C. Ford Guest

    Subject says it. Using Premiere 6,02, I just don't understand why
    preview would play ok on the TV monitor and not on the computer

    Sometimes preview works on the computer monitor, but I don't know what
    settings are different. When I set playback to camera/monitor it works
    fine. The preview/playback is through DV cable to camera and then to
    the tv monitor via composite.

    Camera: Sony PD 150
    Win 2000 service pack 4
    360 or so ram
    Premiere 6.02]
    Basic Pyro 1394 card
    Can't remember the video card, but it is decent.
    AMD 533 processor, I know it's borderline, but it does work.
    Western Digital storage video storage drive. 120 gig 8 meg buffer.
    Video drive is transferring about 17 mb/sec.
    Most of the most common tweaks have been done: DMA, reducing
    background tasks, etc. However, the drive has not been defragged for
    some time.

    The main thing is: Why is the setup able to support output to tv
    monitor and not to the computer monitor??? Does not make sense to me.
    P.C. Ford, Sep 12, 2003
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  2. P.C. Ford

    P.C. Ford Guest

    By the way, seems to capture just fine. Just did 50 minute capture
    with no dropped frames.
    P.C. Ford, Sep 12, 2003
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  3. P.C. Ford

    P.C. Ford Guest

    I notice when I do playback on tv, it plays smoothly and cpu use is
    about 60%.

    When I do playback on the computer monitor, cpu use is solid 100%.
    P.C. Ford, Sep 12, 2003
  4. P.C. Ford

    Dennis Long Guest

    An obvious but sometimes overlooked answer might be that as long as the
    camera is "on", the playback on your PC will be jerky.
    At least when viewing in the editing software.
    Dennis Long, Sep 15, 2003
  5. P.C. Ford

    P.C. Ford Guest

    Thanks Dennis I appreciate the answer. I did try with camera off and
    it was still jerky. I fear the cpu is just not up to the task. It's a
    500 mgH. It will work on smaller resolution stuff.
    For example, 320 x 240 15 frames captures for streaming. Also, it has
    has worked for full size, full frame rate, if I am not mistaken.

    P.C. Ford, Sep 16, 2003
  6. Unlikely...
    BTW, this is what the Canopus Raptor did so well on "slow"
    computers: with its hardware overlay, you could run a
    full-frame-rate, full resolution computer-monitor preview
    window on the computer plus run a TV at the same time
    (with a camera, DV-VCR, or converter box added to serve
    as a converter). This is partly why I continue to use this
    discontinued card - and the codec is both high-quality and
    fast-rendering, giving me a speed advantage compared with
    the MS codec equivalent to having a CPU of about double
    the speed...
    David Ruether, Sep 16, 2003
  7. P.C. Ford

    P.C. Ford Guest

    Thanks, I infer from this that you believe a 500 mgH box should be
    able to display DV footage on the computer monitor?
    P.C. Ford, Sep 17, 2003
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