Re: i and p's

[doka15] "So 1080i 24p is that interlaced or progressive shooting?... why put the P's in front of the 720's and the I's before the 1080's?"

The 720 HD format is always progressive.Hence the "p" It is never interlace.

The 1080 format is called a "progressive segmented frame" or "PsF". This means the images are captured progressively but played back as interlace, so that they maintain usability with the legacy formats for standard def.

in 1080i 60, just as with the 24 frame capture in NTSC, there is a need to add additional content so the video will have the sufficient quantity to achieve the desired 60 fields per second that 1080 needs to smoothly playback at.

This capture as progressive and play back as interlace is indicative to all HDCAM content also. It is the way the format was designed.

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Chicago, IL