View Full Version : Creating useable AVI files w/ JVC high-speed camcorder?

12-04-2001, 08:40 PM
Dear biomechanicists,

We dispose of a JVC camcorder (model DVL-9800) that has the option of
recording at a highest speed of 200 fps (it is a PAL version). When
doing this, the image size is only a quarter of full-size (limiting
resolution), but nevertheless it is very useful for field work.
However, when we grab the recorded sequences (using a Canopus EZDV
board), the resulting AVI file does not consist of the expected number
of frames (200) but of 25 frames that are interlaced and have "frames"
consisting of a mosaic of four subsequent recorded frames. In this way,
eight frames are recorded as one.
However, for analysis we need AVI files consisting of a true 200 fps
time resolution. Therefore, I think we need a utility program that:

1. reads the original AVI of 25 fps;
2. de-interlaces the frames into two fields, each consisting of 4
subsequent images, resulting in a 50 fps file;
3. splits these frames into four, resulting in a 200 fps file;
4. saves this file as a new AVI that can be opened in commercial
analysis software.

Could such utility be written as a macro (e.g. in Adobe Premiere), or is
elaborate programming necessary?

Thank you very much in advance,

__________________________________________________ _____________________

dr. Kristiaan D'Aout
University of Antwerp (U.I.A.) Tel. ++32-3-820.22.69
Department of Biology Fax. ++32-3-820.22.71
Functional Morphology Lab mail: kristiaan.daout@ua.ac.be
Universiteitsplein 1 http://www.uia.ac.be/u/kdaout/
2610 Antwerpen, Belgium
__________________________________________________ _____________________

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