Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 311)

CHAPTER VIEWER
VIEWER 311
10
8. Do one of the following:
• Move the playhead to the last tracked frame in the first half of the clip, and click Mark.
Then move the playhead to the first tracked frame of the second half of the clip, and
click Mark. With two yellow marks appearing in the Tracking bar, click Between.
• Move the playhead to the last tracked frame in the first half of the clip, click Mark, then
move the playhead to the first tracked frame of the second half of the clip and click
Interpolate Rev.
• Move the playhead to the first tracked frame in the second half of the clip, click Mark,
then move the playhead to the last tracked frame of the first half of the clip and click
Interpolate Fwd.
No matter which method you use, a motion path is automatically interpolated to fill
the gap in between the clip’s two successfully tracked sections.
Another common situation is when a feature starts off-screen and then moves onscreen, such as a
person walking or a stationary feature that moves when the camera pans). While you can track the
feature as long as it’s fully within the frame, once it starts to move offscreen, you may lose your track,
and the window will be stuck at an awkward position onscreen even though the feature it’s supposed
to be correcting is gone.
You can use Resolve’s Interpolate features to solve this problem.
To manually set a new offscreen starting position at the beginning of a clip from which to
interpolate to a successful track:
1. After performing the initial track, open the Object Tracking Controls of the Viewer page,
and click Key Frame to change the tracking mode.
2. Move the playhead to the very first frame of the clip and move the window to the most
logical position, for the feature you’re tracking, to have moved to.
3. Click Mark.
4. Move the playhead to the first successfully tracked frame of the feature.
5. Click Interpolate Rev to interpolate a motion path from the first tracked frame, in
reverse, to the mark you made in step 3.
At this point, playing through the clip from the beginning results in the window moving
smoothly from the offscreen position through the rest of the track.
This same technique works for features that go offscreen at the end of a clip by using the Interpolate
Fwd button to interpolate from the last successfully tracked frame to a manually repositioned offscreen
window that has been marked at the last frame of the clip.
Since the Interpolate feature generates a smoothly linear motion path, it may not work if you’re tracking
an irregularly moving feature that becomes obscured. In these cases, you have the option of manually
tracking a window to fit the likely trajectory of the hidden feature, frame by frame.