Looking for editor that can display field stills

Discussion in 'Amateur Video Production' started by Dave Martindale, Oct 26, 2006.

  1. My day job is a video game programmer. Sometimes I end up looking for
    problems in the handling of events that both happen infrequently and
    are over in a few frames when they do happen. A good way to deal with
    these is to overlay a bunch of state information on the screen every
    frame, capture the video output of the game, and play until the problem
    happens. Then I go back over the video from the problem area frame by
    frame to get clues about what happened.

    My capture hardware is a Pinnacle Moviebox DV, which converts incoming
    analog video into a DV25 data stream, so in principle any editor that
    can capture from a DV camera can accept the data. That seems to work,
    and DV25 provides enough resolution to reliably read the text font I

    But viewing it turns out to be more difficult than I expected.
    Pinnacle Studio 9 (which came with the hardware) and Cyberlink Power
    Director 3 actually edit using a half-resolution heavily-compressed
    preview version, and even when that is displayed full-frame the text is
    not fully readable. Windows Movie Maker does display full resolution,
    but its single-step command seems to step 2 frames at a time (15
    keypresses per second of movie time). Movie Player Classic has true
    single-frame stepping and full-resolution viewing, but it can't step
    backwards on video captured by Windows Movie Maker.

    The best combination I've found so far is to capture with Studio 9 and
    then view with Movie Player Classic, which does single-frame forward
    *and* reverse on the AVIs written by Studio 9 (I don't know why they're
    different than WMM's AVIs, but they are).

    But there's still a problem: the videogame runs at about 30 FPS, but its
    buffer swaps are not synchronized with the video frame sequence. About
    half the time, a single *video* frame contains two fields that come from
    different *game* frames, so the odd and even lines contain different
    text, making it difficult to read either field.

    What I'd like is to be able to switch to individual field stills, and
    examine all 60 fields per second individually. That's the sort of
    function I'd expect to find in broadcast-grade hardware and software,
    but I'm hoping someone can point to software that's inexpensive or free
    for single-field viewing. Something that would do capture and viewing
    in one application would be ideal, but I don't mind using two different
    applications (and Studio 9 already seems to handle the capture

    Dave Martindale, Oct 26, 2006
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  2. Martin Heffels, Oct 26, 2006
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  3. Dave Martindale

    Jukka Aho Guest

    And if there's any field-related processing VirtualDub can't do,
    AviSynth (when used in combination with VirtualDub) can:


    They seem to be experiencing server problems right now, though.
    Jukka Aho, Oct 26, 2006
  4. Thank you. The deinterlace(unfold) filter followed by a 2X vertical
    resize does pretty much exactly what I wanted. As a bonus, VirtualDub
    is a decent single-frame viewer too.

    Dave Martindale, Oct 27, 2006
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