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Interlacing fun. How to work separately with odd and even fields then recombine.


reesa
Jul 11 2013 | 1:51 pm

Hello,

I need a few pointers regarding how to get jitter to split interlaced fields into two streams so that I can play separately with them in time.

Most of the help files I read say if you specify a field the software fills in the gaps… My idea is somewhat different.

I’d like to hold the odd field of frame one while playing it with the even field of frame one (original state), then frame two, frame three and so on.

Something like — 1a+1b, 1a+2b, 1a+3b etc. most likely happening at a very low overall frame rate to play and experiment with jaggies and how they break the image up and explore how they reflect motion in the frame.

I can’t quite see how to separate the individual fields.

Thanks in advance.


reesa
Jul 13 2013 | 3:24 am

Perhaps my understanding of what is going on with interlacing isn’t correct … I understand that each frame (lets say ing PAL 25i footage) is made up of 2 fields — 50 fields per second.

What I am not sure of is how, when captured in a quicktime clip, this footage behaves. Does it stay at 50 fields per second in a .mov file?

It’s a bit confusing.

What I’d like is to send odd and even fields down separate paths in jitter so I can play with them in time then recombine them at the end into 25i.


dtr
Jul 13 2013 | 3:31 am

I wouldn’t worry too much about getting the separate fields out of the mov files directly. Instead use [jit.demultiplex] to split whatever comes out of [jit.qt.movie] and play with that. Or am I missing your point?

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