Black Background on canvas

[Damidu]

Hello,
i'm streaming a video with a canvas on it for the score of the match.
But I don't know why the canvas always has black background.

Top is the canvas, bottom is the localVideo after session created.

Can u help?

Davide

 

[Max]

Good day.
Browser captures all the stuff drawn on the canvas as is. So, if you draw the score at left and a picture at right, all the rest of the canvas stay unfilled.
Draw the white rectangle or fill the canvas with white, then draw the pictiures as needed.