Remove white edge halo on video image

Mylenium is right on the nose. I do a lot of greenscreen compositing and properly fiddling with the knobs often requires more than just a couple of clicks in the Effects Control Panel. Just for fun I downloaded your unkeyed frame and tried my hand at pulling a decent key. Here's what the workflow and the comps look like.

The first color grade:

I always use the Color workspace and the scopes when I'm setting up a key so I can see what is actually going on in the comp.

Checking the matte:

I also step through the viewing options in Keylight to make sure I am getting the best matte possible.

Almost the final:

Additional color grading is almost always required after you pull a key. With this shot adding a second instance of Keylight was sufficient. Sometimes I use the keyed footage as a track matte, most of the time, there is more than one copy of the original footage in the final composite.

I have had composites like this take up to 10 copies of the original footage and a bunch of different techniques. The footage is pretty good but could have been exposed a little better, but the frame you shared is good enough to get a good key if you work at it a bit.

* One more suggestion. The "Drag & Drop here..." area is buggy and should not be used to share images. Please use the toolbar or just drag your images to the reply field. You can even copy and paste your screenshot to the reply field with most browsers. It is always helpful if we can see the modified properties of your timeline.

If you want to fiddle with the comp I created from your image I have uploaded it. Check the link.