08 August 2004, 04:40 AM
I think you're missing what fields really are. A field is just an image taken every 1/50th of a second PAL (1/59.97th of a second NTSC) which happens to be half the height of a full frame. Two sequential fields get interlaced together alternating every other line to generate a full frame. If your original video sequence only has 29.97 images per second (NTSC with no fields), you can't just change a setting and get 50 images per second (PAL with fields). Well, you can't, that is, unless you have software that very accurately interpolates frames/fields in video sequences. Your basic After Effects, Combustion, DFX+ can't do that accurately. RE:vision Twixtor and Realviz ReTimer can. They are your only hope of getting CLEAN ACCURATE retiming and field/frame interpolation. Other much more expensive systems Inferno, Quantel, etc. do quite a nice job as well, but are probably beyond your budget.
To close, I'd probably retime/interpolate from 29.97 to 50 frames per second then interlace to 25 frames per second (50 fields per second).
01 January 2006, 12:00 AM
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