i'm just a bit confused by framerates and how they work. i downloaded some videos off the web with a fr of 29.97 which is ntsc, but it seems impossible to get that fr to 25. but it's not such a problem with a fr of 23. why is this?

but really i just want to read up on framerates and that, find out just how they work (with capture) and the main differences between files with pl and ntsc framerates and why certain can an can't be done with them (for example a 29.97fr file encoded to vcd pal in TMPGEnc results in jerkiness).

any information posted here or any links to articles, guides, etc. would be very helpful.