I'm rying to achieve a composite and having trouble. Would love some suggestions on how you would do this!
Here is a reference video: https://vimeo.com/741585892/a320bdab62
(this is not my attempted composite, rather just a temp in the edit)
Basically what is happening on this pan is I need to stitch together two diferent pieces of footage, which are both panning accross the same area. Right now you can see the stitch happen in a crappy cross-disolve over the tree, but it needs to be seamless.
Issue is this was not shot with motion control, so the pan speeds and positions are not exact. So if you simply mask on the tree, then track the mask, the left and right sides of the image dont match up, as the camera is moving at diferent rates. I tried slowing down and speeding up the footage to match, but it wasn't really working either.
Next thing I was going to try was to basically create a panaorama freeze frame of the outgoing pan. Meaning go into Photoshop and composite a still that is maybe three times the width of the video frame, using stills from diferent frames in the source footage. Then I was going to track still onto the the incoming shots position movement, and add motion blur and grain etc, so it feels like video. Then I was hoping the left most side of the still image I composite would be a match for a frame in the outgoing video, at which point I could sync up the shots. If that makes sense...
But what would you try?
Oh and the sequence resoltion is 2;40 but the souce footage is 1;85, so I can move things around a biut vertically.
That's probhably a case for a full re-compose. the lack of motion control isn't even the problem, the parallax simply appears completely wacky and unbelievable. I'd probably slice & dice the tail end and start of shot A and B, respectivley, and create an artificial inbetween.
Let me see if I can describe a workflow that matches what I think is your post-production problem.
The two shots are as follows.
Shot 1: A hand-held right to left pan of a forest scene with a bunch of trees that covers an arc of about 60º
Shot 2: A repeat of the hand-held pan in shot 1, covering the same arc, but this time, an actor is walking through the scene
The final shot: A hand-held pan through a forest scene but halfway through the pan an actor magically appears in the scene walking between the trees.
If that is the basic idea, combining two pans of the same scene with a seamless transition between shots, then this would be my workflow. I. threw the actor into the second shot because that would be something that is obviously different between the two shots.
Here's my workflow.
I have used this basic workflow many times when rotoscoping was not an option.
For your shot, you may have to animate a mask along the right side of the tree and overlap the frames a bit to hide the shift in parallax. It's completely doable. You just need the right mask and the background framing and speed to match up.
Here's another workflow I have used when the transition between shots is more complicated.
Here it is in a nutshell.
Pick the part of both shots you will use for the transition and trim them with a few extra frames on both ends. Pre-compose both of the trimmed shots. Apply Mocha AE, then track the background with translation only, making sure you unlink the spline from the layer. When the track is good, lock it, then add another spline that will be used to cut out the transition area, like a tree and everything to the right of it. Link the spline to the background track and make any adjustments you need to so the roto is complete.
Repeat with the second layer. You now have a left side mask and a right side mask on two layers.
Gather the tracking data from Mocha AE, invert it, and apply Translation only to the same layer. This will stop the camera move. Add a null, parent the motion stabilized layer to the null and move it in the comp frame, so the mask is about halfway through the shot.
Repeat with the second layer. You should have a composite now where the seam between the two shots does not move.
Add another null and apply the Tracking data from the ending shot to the null, making sure that Invert is turned off. Parent the null from the first shot to the null from the second shot, then parent the second shot null to the third shot. This will put the camera movement from the first shot back in the first shot and match the second shot to it. You can then adjust the anchor point of the third null to line up the shot, the speed should match, and the invisible joint will be as good as your roto.
I don't have time to knock out a tutorial on the workflow, but those are the basics. I don't know of a tutorial I can point you to that uses this workflow, but it works well, and I have used it about a half dozen times in the last couple of years.
Thank you for these tips!