Would anyone might know why I can't chroma the white background?

[UGAdventures]

Hello, we have an Adventure channel for the outdoors and hiking we are working on. I can't chroma the background of this video clip my friend built for me. It appears the background is white but chroma is working. In fact there are other strange things going on with the file. I'll attach it for reference. Any help is a appreciated, I'm very new to filming and editing as a whole.


[Attachment 54701 - Click to enlarge]



[Attachment 54702 - Click to enlarge]

[pandy]

Chroma for black and white are equal to null - no chroma thus no key... use additional picture (or same) but with exposed explicitly alpha on white background - this should work even better than regular chroma key.

[smrpix]

You need to do a luminance key or just resave the image with an alpha channel.

Here:

[UGAdventures]

Thanks for the input! that helps