Long shot in pfTrack 2011

[erik midnatt]

Hi.

I’ve been using pftrack for a long time and know most tricks, but
this is the first time i try something longer than a few couple of hundred frames.

I have a 2000 frames long shot that I’ve been working on.
It’s been quite a pain and i’ve spent probably 12 hours doing manual tracking.

I can solve all parts of the shot now if I make tests of 700 frames or so, with very low error (< 5).
The problem is when i start to try to solve everything 1-2000 frames for one camera, the first part goes quick up till until 500 frames, after that it seems like the solution goes slower and slower. At around frame 1200 the solver can take 10 seconds for just one frame and i can only imagine how slow it will be towards the end.

Is this really how it is suppose to work? The solver get slower and slower the more frames it has to chew on?
I know there is the possibility to Align cameras and Merge them, but its hardly very exact and I hope this isnt the only solution.

Thanks very much for any input!

[Anonymous]

I can add that those extreme slow solves rarely works and the whole solution goes bonkers instead.
The only way I can think of now is to break it up into 3-4 shorter cameras and try to merge these, but i rather not 🙂

[Anonymous]

1. Doing a few 500 frame sequences and aligning & merging would be one way to go about it.

2. You might want to try solving the first half of the track. Then solving the second half separately. when those two sections are good, try merging them together with a third solve of the middle 200-300 frames overlap.

…just a couple ideas.

cheers,
S

[Author]

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