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virtualdub capture 1080p24 questions

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I'm capturing video output from an LGBD670 Smart BluRay player using virtualdub. I also capture with AmarecTV. The LG display setting is set at 1080p24. My capture cards supports 1080p24.

The sample content source is labelled "SUPERHD" by the large Internet streaming content provider, and elsewhere its said that SuperHD means 1080p24 by this provider. The quality is noticeably excellent. I'm fairly certain its 1080p24 or better.

Two issues with Virtual dub 1.10.4.xxxx:

1.) When I try to set the frame rate in Capture>Settings it won't allow me to enter 24.000, nor will it let me set the fps to 25 by clicking on the screen icon and choosing. Instead I continue to see the 29.97 value on the icon at the bottom right of the overlay screen.
2.) When I watch the video there is an oscillating hesitation. It happens, probably each second. To make up an explanation, perhaps virtualdub captures the 24 frames sent, and then "waits" four frames, displaying nothing, then captures another 24 frames etc. Each second there is slight pause.

(AmarecTV, uses the same lossless codec, and does not seem to show the pause either during record or playback, when its fps is set to 29.97. AmarecTV drops many, many frames when I choose either p24 or p25 alternatives.)

Questions:

1.) Assuming the source content is 1080p24, the plumbing is 1080p24, as is the capture card, what fps should I choose using virtualdub? Should I being try some kind of realtime 3:2 pulldown or is that something I would use later when encoding the lossless 24fps codec to a lossy 29.97 codec?
2.) Why does virtualdub not accept my fps choice, either when I type it in, or click it in, when the desired fps is lower or other than 29.97


Thanks.

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