There is a bug in the latest release that can be easily overcome. Here's the procedure.
Start at the head of your clip.
- Set Stabilize Motion or Track Motion and start tracking. You don't even have to set a track point, just run the tracker.
- When the tracking slows down and stops stop tracking
- Press the U key to reveal the keyframes and the tracker
- Select Track 1 and delete it
- Start again, this time selecting your points
The tracker should run just fine
If it doesn't, try the process again but start in the middle of the clip and track backwards. I've only had to do this once.
Thanks Rick. Your method made no difference but did highlight more of the issue diagnostics further. It definitely seems to be something to do with cached frames. I've now tested this over and over to be sure by clearing the image cache, trying a track and it gets no more than 10-20 frames. Heres my new workaround that works every time assuming you are tracking forwards:
- Clear the image cache
- Create a motion tracker and adjust its placement/settings
- Press 'B' then Shift-1
- Make sure Preview is set up for Work Area only and From Current Time (Although this is a bug in the current CC15.3 and ignores the Work Area range and plays from the beginning regardless)
- Start a ram preview until it loops then stop it
- Press '1' to go back to the marker
- Start forward tracking. This will keep going till about 10 (±10) frames after the cached frames
- Once it has stopped, stop the track then repeat from step 3
- Keep going till you finish your track.
900 frames took me 3 goes on a 16GB machine with coaching set to high priority and Ram available to AE set to 13GB. Pixel dimensions will have a bearing on this.