-
30i and NTSC conflict
I think that I understand that 30i,50i,etc.. means to shoot fields and not frames, making it easyer to later convert down to 29.97 or 25 frames. What does it mean to shoot fields and not frames?
I got footage that was shot with HD. Premiere Pro info says that it is 1280X720 (1.0) 29.97… (and I know it was shot 30i and was shot for widescreen) I must question this because I need to export this for widescreen (16:9):
1. What ARE the demention for widescreen?
2. If the footage is 1280X720, and was shot with fields and NOT frames (30i), how is 29.97 relevant??
3. Why does it say (1.0) which in my understanding is sqare pixels, which also in my understanding is what is used only with progressive images and the HD camera shot interlaced fields!
4. Finally, WHAT export settings should I use to get this video to export to be viewed on a widescreen?
Thank you!
-
4 Replies
-
The “i” after the number stands for interlaced 50i, 60i
You need to do a bit of reading so people don’t have to write a basic course in video, Adobe has a bunch of Primers on various subjects at this URL: https://www.adobe.com/motion/primers.html
-
I don’t understand your answer. Did you not read my post? Do you think I don’t know that i means interlaced? I wrote that I know that shooting interlaced video means shooting fields and not frames.
I read more then enough and watched hours of tutorials and my main question is technicaly what does it mean to shoot interlaced fields and not interlaced frames? The interlaced lines make a field!
It seems that there are THREE kinds of shooting:
1. progressive (eg: film, cameras that support it)
2. What every other camera shoots in (I thought interlaced)
3. “i”… interlacedWhat is the difference between 2 and 3?
Thank you.
-
There is no difference between 2 and 3. You either shoot progressive or interlaced – or some odd flavor of interlaced that pretends to look like progressive (some Sony cameras) but is still interlaced.
It would help if you specified the camera and the exact mode. I don’t know that there are any cameras shooting 1280X720 in an interlaced manner. I do believe that most 1280X720 is progressive, if not all of it.
As for fields and frames….
Frames are made up of two fields taken 1/60th of a second apart in interlaced footage. To deinterlace you can throw out one field or merge them together, of any number of different schemes. Progressive is nothing more, really, than one field taken for a longer duration.
Interlaced can have jaggies but look better on an interlaced TV, and Progressive can smear a bit. Both have their place but I believe that Interlaced will disappear completely when we are all shooting 1080P.
In any case, when you say you have interlaced footage at 1280X720, I am a little surprised. Can you please be more specific as to how that was accomplished.
Steven
https://www.stevengotz.com -
All I know is that it was shot with a HD camera, Widescreen, 29.97 30i. The 1280X720 is what Premiere is telling me that my footage is.
Reply to this Discussion! Login or Sign Up