BobY

That's the old system. I'm not talking about video tape.

AFAIK, Pull-down for HD is done digitally, so it never takes the odd video field from one film frame and the even video field from another film frame--it goes back to the film frame in the buffer memory and always takes both the odd and even fields from the same film frame.

It's not a real-time process, there is always several frames of delay between the film frame currently being scanned and the frame (fields) being output, or it's completely done as a post process after all the frames are in memory.