Blackmagic Forum

I select a point in background and use "Tracker" to location the pic. The function of "match-move" in "Tracker" node is not stable. When I click "selectedFrame" button, location is not always accurate.Is there something wrong with my use? Please teach me if someone know how this node work.

Nobody knows?

Selected Frame mode only works for the frame at which you begin tracking. That is, the frame you were looking at when you first selected the pattern to be tracked. There's a script, though, that lets you reset the reference frame to whatever frame you happen to be looking at.

The TrackerPlus macro available in Reactor has the script built-in on a button called "Set Current Time As Reference Frame".

In case you haven't yet installed Reactor, get it here: https://www.steakunderwater.com/wesuckl ... =32&t=1775

For general instruction using the Tracker node, please consult the Fusion 9 User Manual, beginning on page 310:
https://documents.blackmagicdesign.com/ ... Manual.pdf

And the Tool Reference Guide, beginning on page 657. The entry specific to the Reference Frame control is on page 666.

The standard 2D tracker has a serious bug that has been there for many many years, from long before Blackmagic bought Eyeon. It's been reported many times with no response.

Basically the reference frame function is screwed - it can change the ref frame (and therefore the track) when you change the length of the animation, when you write out the comp file and read it back in and any number of other ways. It makes this function basically unusable.

The solution is to use Secondman's excellent TrackerPlus, available on Reactor and here

https://www.steakunderwater.com/wesuckl ... ipt#p10372

which has a correctly functioning reference frame. Among other things it also allows single frame single supervised tracking, which is pretty difficult in the normal 2D tracking mode.

There have been many calls for an update to the 2D tracker over the years, again with nil response.

The problem is sloved, thanks for all guys help.