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home made screen capture app, but problem converting to 29.970 fps

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i've been working on a new screen capture app, for webpage streaming videos.

for simplicity and debugging purposes, i am capturing from my tv capture card's output in a small window to .png files. the size are aprox 130kb per image. i really need to incorporate a better container, like a single stream file, but that's another improvement i will tackle next. for now i am capturing to .png files.

now my problem is with converting the .png images to the 29.970 frame rate. for some reason, after i encode to say, xvid, the videos are playing sort of in fast motion. i was sure i overcame a similar situation once before, but that was very long ago and i can't remember how (if) i did it before.

edit 1: updated below.

Code:

# test screen capture clip, 15sec opening theme scene
# glc_00001.png through glc_00431.png
  imagesource("d:\streams\glc_%05d.png", 00001, 00431, 29.970)
# assumeFPS(29.970)
# convertFPS(29.970)

edit 2: here is the test clip in question...i am still doing work on the app's capture efficiency and dimension setup, etc. clip was 325x240 and cropped 324x240 so that imagesource would open images w/out errors.
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