This may need to be moved. But it follows up a current GH2 comment.
For years I have seen the differences between 60i and 59.94 fps or 30 and 29.97 being referred to as a "pulldown." Most recently in Barry Green's "Gh2 Hdmi" reply:
"...you can't force the Nano to strip out the pulldown from 59.94->60.00. It can strip out 2:3 but it records the 60.00i as 60.00i"
I must be missing something basic here as I've always understood that 29.97 and 59.94 originate from the original NTSC color standard requirements as opposed to "pulldown" being associated with telecine. But as I think about this, I guess we must be using "pulldown" in the most generic way to simply signify a conversion?
RBG
From wikipedia NTSC
Color information was added to the black-and-white image by adding a color subcarrier of 4.5 × 455/572 = 315/88 MHz (approximately 3.58 MHz) to the video signal. To reduce the visibility of interference between the chrominance signal and FM sound carrier required a slight reduction of the frame rate from 30 frames per second to 30/1.001 (approximately 29.97) frames per second, and changing the line frequency from 15,750 Hz to 15,750/1.001 Hz (approximately 15,734.26 Hz).
When color was later added to the system, the refresh frequency was shifted slightly downward to 59.94 Hz to eliminate stationary dot patterns in the difference frequency between the sound and color carriers, as explained below in "Color encoding".
For years I have seen the differences between 60i and 59.94 fps or 30 and 29.97 being referred to as a "pulldown." Most recently in Barry Green's "Gh2 Hdmi" reply:
"...you can't force the Nano to strip out the pulldown from 59.94->60.00. It can strip out 2:3 but it records the 60.00i as 60.00i"
I must be missing something basic here as I've always understood that 29.97 and 59.94 originate from the original NTSC color standard requirements as opposed to "pulldown" being associated with telecine. But as I think about this, I guess we must be using "pulldown" in the most generic way to simply signify a conversion?
RBG
From wikipedia NTSC
Color information was added to the black-and-white image by adding a color subcarrier of 4.5 × 455/572 = 315/88 MHz (approximately 3.58 MHz) to the video signal. To reduce the visibility of interference between the chrominance signal and FM sound carrier required a slight reduction of the frame rate from 30 frames per second to 30/1.001 (approximately 29.97) frames per second, and changing the line frequency from 15,750 Hz to 15,750/1.001 Hz (approximately 15,734.26 Hz).
When color was later added to the system, the refresh frequency was shifted slightly downward to 59.94 Hz to eliminate stationary dot patterns in the difference frequency between the sound and color carriers, as explained below in "Color encoding".