Frames and Resolution Confusion

[Steve Witt]

When talking about 24p, I'm aware that this means 24 frames per second progressive. And I think I understand it (sort of).

And unless I am confused, I'm pretty sure that 1080i means one thousand, & eighty lines of resolution interlaced scan.
___________________________________________________________

My question here is when you are dealing with 24p, then what is the lines of resolution? It can't be 1080i because that is interlaced, right?.....so is it 1080p with 24p? I am a new HV20 owner and the reason this question has entered my mind is because I am reading info on HDV and HD in general and some times it will talk about frame rates and progresssive or interlaced, and other times it is only talking about the lines of resolution and whether it is interlaced or progressive. Can there be a mix of interlace and progressive when talking about frames and lines of resolution or are they automatically the same? Sorry if this is Confusing.

[Pedanes Bol]

Each frame of either 1080i or 1080p resolution image will have the same resolution. The difference is that, one frame of 1080p image contains 1080 progressively scanned lines in it, whereas one frame of 1080i image contains two interlaced 'fields' consisting of 540 lines each and complementing each other. The eye (brain) puts the two fields together to make a full frame of 1080 lines of resolution.

P.

[Pedanes Bol]

HV20 creates 24 progressive frames per second in 24p mode but records it on tape embedded in a 60i stream (using 3:2 pulldown) in order to meet the HDV format requirements. So the resulting video has 30 full frames but still contains the original 24 progressive frames in it.

P.

[Steve Witt]

Originally Posted by Pedanes Bol

Each frame of either 1080i or 1080p resolution image will have the same resolution. The difference is that, one frame of 1080p image contains 1080 progressively scanned lines in it, whereas one frame of 1080i image contains two interlaced 'fields' consisting of 540 lines each and complementing each other. The eye (brain) puts the two fields together to make a full frame of 1080 lines of resolution.

P.

Ok, understood. Thanks. But when you are talking about the 1080i that means the frames(whatever the rate may be) are interlaced too, right? And when talkin about 1080p that means that the frames (whatever the rate) are progressive.....Is this correct.

I mean since the HV20 puts 1080i on your DV tapes, but you decided to record in 24p then do the 3:2 pulldown afterward what is the resolution then....is it 1080p?

[Steve Witt]

Originally Posted by Pedanes Bol

HV20 creates 24 progressive frames per second in 24p mode but records it on tape embedded in a 60i stream (using 3:2 pulldown) in order to meet the HDV format requirements. So the resulting video has 30 full frames but still contains the original 24 progressive frames in it.

P.

So it is packaged as 60i (meaning 60 fields per second) two fields to make 30 full frames per sec. And these 30 full fps only appear to look like 24p (smoke and mirrors)? And then the resolution is still 1080i?

[Pedanes Bol]

If you look at your footage taken at 24p mode with your HV20, frame by frame, you will see 3 progressive frames + 2 interlaced frames per every five frame block. (3:2 pulldown). The final resolution is still 1080. I think your question is what to call this, 1080p or 1080i. It is technically called 1080i, but the pulldown can be reversed using special software (reverse telecine) and the original 24 progressive frames can be extracted. After that, I think you can call it a true 1080p (24p).

P.

[Steve Witt]

Originally Posted by Pedanes Bol

If you look at your footage taken at 24p mode with your HV20, frame by frame, you will see 3 progressive frames + 2 interlaced frames per every five frame block. (3:2 pulldown). The final resolution is still 1080. I think your question is what to call this, 1080p or 1080i. It is technically called 1080i, but the pulldown can be reversed using special software (reverse telecine) and the original 24 progressive frames can be extracted. After that, I think you can call it a true 1080p (24p).

P.

That helps Pedanes....Thankyou so much. Also, just found this link and it helps too.

http://www.microsoft.com/windows/win...sion_hdformats