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You need handles; an AE comp is only as long as it is in AE. Add some additional frames to the beginning of the clip in AE, and at the end, and then trim the comp in Premiere to remove those frames. That way, when you add the dissolve, you'll have some frames with which to create the dissolve.
If you see a little gray triangle at the head or tail of a clip that looks like:
...that means you have no more frames to work with.
To expand a bit on Colin's comments, back in the film days, the concept of Handles was easy to grasp, as the pieces of film were on an A and a B Roll, and the editor had to physically overlap them by the desired amount, so that the lab could print with a Dissolve. The same held for the days of A-B Roll digital editing, where the Clips were again physically overlapped on separate Tracks. Then, digital editors were developed that allowed one to edit with the Clips on a single Track, and where Transitions were applied between them. The Handles were necessary still, but were no longer visually obvious.
These images will tell you a bit more about the concept:
Hope that this helps,
Yah know, if you click on the problem transition and then open the effect control window, PrPro will show you the handles in your transition. You can even use the trim tools on the "mini-timeline" in the effect control window and directly view whether or not you've pulled back or ahead enough to get adequate handles.
Gents, thank you so much for the advices and solution - I read, I understand! :-) The experience in this forum is amazing, I'm grateful you're willing to share your expertise.
You are most welcome.
Colin, great answer; add more frames, but could you please shed light on how and when? I now have 20 AE clips in Pr trapped between 20 stills, and no room for transition. Can I fix this, or do I need to go back, add 6 frames to each end of each clip before I dynamically link into AE, add my text effect, go back tpo Pr and then squeeze down each clip by 6 + 6 frames so that I can then apply my 12sec transition?
I dont know of a easy way to fix this because you cannot link back to the original clip, so you have to go back in AE and add frames. Or do the whole thing over.
My workflow is I the copy the clip in the timeline, superimpose and give it extra frames front and back (usually more than I need).
Then DL this extended clip to AE.
This way you will always have the original.
Ann, thanks. Makes perfect sense. (Just hope the client doesn't notice this time round - otherwise I'll have a lot of re-work )
But is there actually a way to 'add frames' in AE? I still have all the comps, but I could not see any way to extend them, other than stretch them.
Extend comp in AE. Fill it out on both sides.
Back in Pro, load clip in EW (so you can see what you are doing) and slip.