24P vs. 24PA cont'd.
by Carrie Anders
(...continued
from previous page)
Most home
televisions are interlaced televisions anyway and cannot provide
true 24P. The only way for someone to view a movie at home in true
24P would be if they had a progressive scan LCD television along
with a progressive scan DVD player or simply had one of those
$1000.00 progressive scan DVD projectors. So chances are that most
homes in the world don’t own a progressive scan LCD AND a
progressive scan DVD player or a $1000.00 projector. DO YOU??
Just the Facts:
In 24P regular the Panasonic DVX100 does the following:
- The Panasonic DVX
100 does record a true 24 frames per second but must record 60
interlaced fields per second because of the limits of mini-dv
recording.
- The Panasonic
DVX100 then performs the 2:3 in camera pull down in order to convert
the true 24 frames per second to 60 interlaced fields per second.
- The Panasonic DVX
100 2:3 in camera pull down equation is this: every two progressive
frames are written to five interlaced fields. This then
compresses/converts the 24P regular into 60 interlaced fields.
(2-progressive
frames are written to 5 interlaced fields) This is in
somewhat like an up-res because 1 progressive frame is equivalent to
2 interlaced fields. So in order to make 2 progressive frames equal
5 interlaced fields the 2:3 pull down must merge 2 progressive
frames together in order to make the 5th interlaced field
a possibility.
(5-interlaced
fields times 12-progressive frames equal 60 interlaced
fields containing the 24 progressive frames)
24P Advanced:
The 24P advanced mode is definitely more for the projects that
will ultimately end up on the big screen.
The reason for this
is because of the DVX100 2:33:2 in-camera pull down. The principles
are similar to the 24P regular except for the cadence of the 2:332:
pull down method… and this is why.
- 24P advanced
frame one gets written to 2 interlaced fields.
- 24P advanced
frame two gets written to 3 interlaced fields.
- 24P advanced
frame three gets written to 3 interlaced fields.
- 24P advanced
frame four gets written to 2 interlaced fields.
This sequence
repeats 6 times per second. This equals to 24 true progressive
frames per second, hence the 2:33:2 pull down. This particular pull
down mode does not compress any of the 24P advanced frames. Just be
sure to set your capture and timeline preferences on you NLE
specifically for the 2:33:2 advanced pull down mode. If the NLE that
you plan to edit on does not possess the 2:33:2 pull down mode, then
recording in the 24P advanced mode is not an option.
Here are some
additional resources to help you visualize the concept of the 24P
regular and 24P advanced pull down modes from your DVX100. Some of
these resources have very detailed graphics and more complete
scientific information. I truly do feel it is very important to
fully understand what pull down mode will best suit your work flow
and project.
http://www.kenstone.net/fcp_homepage/24p_in_FCP_nattress.html
http://www.adamwilt.com/24p/
I wish you the
best!
Do
YOU have a cheap, low budget, do-it-yourself DVX100 tip or trick that
you'd like to contribute?
If so, just email it to
us and we'll post it up!
Thanks
for helping the grass roots grow!
