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jschoonj
jschoonj
Participant
January 15, 2017
Answered

How to Reverse Telecine (2:2 pulldown)

  • January 15, 2017
  • 2 replies
  • 3263 views

Hello everyone,

I'm shooting some footage on a Panasonic HPX 171 (HPX 170 in the States) in 1080i25p DVCPRO HD, which I would like to get back to a true progressive image.


As I understand it the camera takes a true progressive frame of the sensor, and then wraps it into a 1080i interlaced package.

When I check the properties of the file, it states it used a 2:2 pulldown, which I learned is actually a process called telecine.


Now for my question: how do I get Premiere to reverse that telecine and go back to my original 25fps progressive image that was on the sensor?
Is it just as simple as interpreting the footage as a progressive source, or will that create problems when I do an export later on?

Also, will I lose any quality during this process and am I better of shooting true 720p with this camera?

Many thanks in advance!

Sincerely,

Joni.

EDIT [moved to correct product forum – moderator]

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This topic has been closed for replies.
Correct answer Ann Bens

MIght want to read this:

ProVideo Coalition.com: TecnoTur by Allan Tépper 1

2 replies

E
excited_Genie16B8
Legend
January 15, 2017

As I understand it the camera takes a true progressive frame of the sensor, and then wraps it into a 1080i interlaced package.

I don't believe that's correct.  The camera is almost certainly recording half the sensor 50 times a second.  Which means that every field is a unique moment in time, and you may not be able to stitch the two fields back into a progressive whole.

jschoonj
jschoonjAuthor
Participant
January 15, 2017

I understand your reaction as it does seem a bit weird to wrap the progressive frame in interlaced footage, but I'm quite sure that's how the HPX works. I've been doing quite a bit of reading on DVXuser.

M
Meg The Dog
Inspiring
January 15, 2017

From Panasonic, the recording options on the camera:

If you are recording in the 1080/25p (over 50i) setting, you should be able to drop the footage on a 25p timeline with no visual consequences as for each frame of the interlaced footage, the two interlaced fields that make up the recorded frame will have been derived from the same progressive frame from the sensor.

MtD

    Ann Bens
    Community Expert
    Ann BensCommunity Expert
    Community Expert
    January 15, 2017

    I would just interpret the footage to progressive.

    You will have to do some testing before you start your project.

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