imageonepictures
Well-known member
Hi,
What exactly does 24p Advanced mean? Should I shoot with this instead of regular 24p?
Chris
What exactly does 24p Advanced mean? Should I shoot with this instead of regular 24p?
Chris
24p vs. 24p Advanced
- Thread starter imageonepictures
- Start date
Brandon Rice
Distributed Producer
It's what I always use (24Pa)... basically it's a different pulldown method (aka your NLE will interpret the footage different)... 24Pa is better as it's much easier if you EVER wanted to print to film...
I posted this in another thread a few weeks ago, but here you go.
There are two pull downs, which allow us to record 24p. The first is 24p normal. The 24p normal pull down is 2:3:2:3. The reason for this pull down is because in order for us to get 24 frames to fit into 60 interlaced fields we need every 4 set of frames to fit into 10 fields. The pull down works by having the first frame printed to two video fields, and the second frame printed to 3 video fields. The pattern then repeats itself, so every 2 frames get written to 5 video fields. So for every 4 frames your getting 10 fields. This process happens 6 times per second, which leaves you with 60 fields. Because of this pull down you end up with 2 split frames and 3 full frames. So for example, if you have four frames
A B C D your first two frames will look like this: aa bb. But your third and fourth frames will be a combination of two fields, so they will look like this: bc cd. And then your last frame will be a full frame and will look like this: dd. So you can think of the pull down as taking 4 frames and making it into 5 frames. So you have 5 frames, which is equivalent to 10 fields of video. So 10 multiplied by 6 equals 60 fields. Since all of this fits into 60 interlaced fields, you’re able to edit it using a standard 29.97 timeline in your Non Linear Editor.
The second pull down is known as the advanced pull down and records using a pull down of 2:3:3:2. Essentially, this pull down does everything as the normal pull down does to record to tape. However the difference is that because of the pattern it leaves only 1 split frame and 4 full frames. So since the process occurs 6 times a second, you are left with 24 full frames. Using your NLE while you are importing this footage you are able to remove the split frames leaving you with a full 24 frames for every second. So because of that you are able to edit using a 23.98 timeline.
Here are two links which explain 24p very well.
http://www.adamwilt.com/24p/
http://www.kenstone.net/fcp_homepage..._nattress.html
I hope this all helps.
There are two pull downs, which allow us to record 24p. The first is 24p normal. The 24p normal pull down is 2:3:2:3. The reason for this pull down is because in order for us to get 24 frames to fit into 60 interlaced fields we need every 4 set of frames to fit into 10 fields. The pull down works by having the first frame printed to two video fields, and the second frame printed to 3 video fields. The pattern then repeats itself, so every 2 frames get written to 5 video fields. So for every 4 frames your getting 10 fields. This process happens 6 times per second, which leaves you with 60 fields. Because of this pull down you end up with 2 split frames and 3 full frames. So for example, if you have four frames
A B C D your first two frames will look like this: aa bb. But your third and fourth frames will be a combination of two fields, so they will look like this: bc cd. And then your last frame will be a full frame and will look like this: dd. So you can think of the pull down as taking 4 frames and making it into 5 frames. So you have 5 frames, which is equivalent to 10 fields of video. So 10 multiplied by 6 equals 60 fields. Since all of this fits into 60 interlaced fields, you’re able to edit it using a standard 29.97 timeline in your Non Linear Editor.
The second pull down is known as the advanced pull down and records using a pull down of 2:3:3:2. Essentially, this pull down does everything as the normal pull down does to record to tape. However the difference is that because of the pattern it leaves only 1 split frame and 4 full frames. So since the process occurs 6 times a second, you are left with 24 full frames. Using your NLE while you are importing this footage you are able to remove the split frames leaving you with a full 24 frames for every second. So because of that you are able to edit using a 23.98 timeline.
Here are two links which explain 24p very well.
http://www.adamwilt.com/24p/
http://www.kenstone.net/fcp_homepage..._nattress.html
I hope this all helps.
rhandomskate
Active member
so basically when i want to mix 24p footage with regular 60i footage, on the regular 29.97 timeline, i should shoot 24pa??? or is it the other way around.
andy_starbuck
Well-known member
Investigate or test before you commit: some programs/versions deal with 24p or 24pA better than others. And some do not handle one or the other properly. If you are trying to work with 24pA and remove the pullodwn, then make sure you single-step through several frames in sample footage to see that it has not accidentally confounded the cadence and included interlaced frames in the result. Some programs will try to remove pulldown from 24p in error.