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Analyzing On The Fly

To align two shots and calculate the alignment on the fly, do the following:

1.   Find two shots that are of the same scene, but have slightly different camera motion and foreground objects. Select Image > Read to load both these shots.
2.   Select Furnace > F_Align.
3.   Connect one of the shots to the source (Src) input of F_Align and the other to the reference (Ref) input. View the output from F_Align.

The Src will be immediately repositioned so that it aligns to the Reference shot without any need for analysis.

You will see the following banner in the overlay:

No valid key framed analysis found. Analyzing during render.

4.   Depending on the exact difference between the two shots, you may need to enable the Scale and/or the Perspective toggles to get a decent alignment.
5.   You may also need to reposition the Analysis Region depending on the differences in foreground detail. However, leaving it at the default position works well for most shots.
6.   To see how closely the two clips have aligned, press M on the Node Graph to insert a Merge node. Connect the Merge node’s A input to F_Align and the B input to the reference image. View the output from the Merge node. Then, adjust the mix slider in the Merge controls to dissolve between F_Align’s output and the reference clip you wanted to match.