1080i/25p with MC ???

[Terence Curren]

Doesn’t matter what you call the tape or codec format. Something is either captured in the exact same instant, Progressive, or else parts of the picture are captured at different points in time, Interlaced.

How you decide to record them cannot change that fact.

[Job ter Burg] “Even if your content is captured in 25p, they require rolls and crawls to be 50i, and 50i is what they broadcast.”

Exactly my point. Those titles are interlaced because they are created with each filed in a different point in time. If you record that interlaced titles to a “Progressive” tape, it won’t change the fact that they are interlaced. If you send them out to a “progressive” codec, they will still be interlaced.

This proves that the determination of interlace vs. progressive occurs at the time of creation, regardless of tape format or codec.

I stand by my definition. There is NO “progressive” tape recording format as all the tape formats break the frame into two fields to record them. But you can have progressive material recorded on those tape formats. Hence they call them progressive.

But you could create a 24 frame interlaced title in After Effects, then record it to HDCAM 1080P. Even though the tape format is called progressive, the source is still interlaced.

Or go the opposite direction, if you recorded a 30P source to 1080i 30 on tape, would that be progressive as that is what the source is, or would it be interlaced as that is what the tape format is?

There in lies the rub with this naming convention.

Terence Curren
http://www.alphadogs.tv
http://www.digitalservicestation.com
Burbank,Ca