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Old 30 Jun 2002, 12:32 AM   #1
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Default filter for virtualdub: framerate

For 1CD-ripps I try to reduce al unneccessary parts to the minimum but want to keep the full length. For intro/outro it would be usefull to do a fake framerate reduction so that only every second framechange is shown while the real framerate still is as the original. If I didn't explain it correct maybe this will help:

I take this video:

frame1 frame2 frame3 frame4 frame5 frame6 frame7 frame8 ...

and get this:

frame1 frame1 frame3 frame3 frame5 frame5 frame7 frame7 ...

Specially for scrolling outro-text it would only use a little more than half the bitrate. I think there is a method if I use avisynth, but is there any filter for virtualdub?
don't trust in guides
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Old 30 Jun 2002, 01:49 AM   #2
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You can use the decimate filter to throw away every other frame.
Don't know if there is a frame doubleing filter also, and Donald Grafts page is down atm so I can't check it right now.

Another clever trick is to do a fake frame size reduction.
First chop the pictue down to a resolution X*32 or so, and then use the resize filter to extend it back to the original resolution. This will add some huge black borders, which of course compress very well.
Donate your idle CPU time for something usefull.
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Old 30 Jun 2002, 03:01 AM   #3
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Yes, I allready chopped an added black borders or simply used a still picture instead of the whole endcredits, but I think the framerate-thing could give better results on some videos. Still searching ...
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