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Techniques for Independent Production
The challenges of creating Digital Cinema and other narrative forms.


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Old November 13th, 2004, 03:55 PM   #1
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60i 30p 24p

after reading this post you'll say . this guy dose not have a clue . with that out of the way , i understand from things i read that a hollywood type dvd movie is 12-15 fps . that being the case isn't it practical to take video in 24-30 fps . also its to my understanding that when our eye is given a chose , meaning the same video 60i or 30p-24p it will enjoy the 24-30fps better . l have a question , i just played a dvd i made of family useing imovie in a plain old dvd player but on a hd tv that my freind has . you know he has hd cable and i have to say that my eye says the video looks as good as the hd video from his cable , how come . please remember i am new to all this please explain in lay terms . thanks in advance dp p.s. i used a panasonic ag dvc 30
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Old November 15th, 2004, 09:04 AM   #2
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Movies (also on DVD) are not 12-15 fps, they are 24 fps.

Most consumer camera's shoot in 30 fps/60i (29.97 to be exact)
interlaced if you are in NTSC country (25 fps/50i in PAL countries)

Some camera's can shoot progressive 30p, 25p or 24p.

I'm not following you on your last question. Do you wonder why
it looks so good compared to cable? If so, perhaps you should
ask why the cable (if it is HD) looks so bad.
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Old November 16th, 2004, 05:29 AM   #3
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thank you Rob for your reply . i was reading about 2-3 , 3-2 pull down .i thought the way i understud it that there are 12 to 15 fps . maybe you can dirrect me to some simple info on this . on the hdtv i notice that the video from camera or on a dvd looks great . its much better than on my sdtv .much much better . see i thought only hd video would look good . well thank you sir . i am just starting to learn about theese things thank you for your knowlage . dp
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Old November 16th, 2004, 05:48 AM   #4
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2:3 pulldown is the method to store 24 fps inside a 30fps (29.97)
NTSC signal and be able to totally restore that. What happens
is that the frames are split up into two fields and for the second
frame one field is repeated, see the following link:

http://www.adamwilt.com/24p/#24pRecording
(Under "How is 24p recorded? What's the difference between 24p and 24p Advanced?")

So the original frame sequence was:

AA BB CC DD (4 frames / 8 fields)

this becomes the following in 2:3 pulldown:

AA BB BC CD DD (5 frames / 10 fields)

This produces a 30 fps signal from a 24 fps source. On the new
24p camera's there is also a new option called 2:3:3:2 pulldown
which generates the following sequence:

AA BB BC CC DD (5 frames / 10 fields)

If you want to know more about the difference between these
two methods see the following thread:

http://www.dvinfo.net/conf/showthrea...threadid=34703

So to sum it up:

Film (and film on DVD) is 24 fps. You can pull that down (is what
a DVD player does normally on playback) to 30 fps (called 2:3
pulldown).
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Old November 16th, 2004, 06:21 AM   #5
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thank you Sir . a picture sure helps me to better understand . i will read it much closer tonite . thank you Rob dp
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