drawbox_vaapi

Draw a colored box on the input image.

It accepts the following parameters:

x

y

The expressions which specify the top left corner coordinates of the box. It defaults to 0.

width, w

height, h

The expressions which specify the width and height of the box; if 0 they are interpreted as the input width and height. It defaults to 0.

color, c

Specify the color of the box to write. For the general syntax of this option, check the (ffmpeg-utils)"Color" section in the ffmpeg-utils manual.

thickness, t

The expression which sets the thickness of the box edge. A value of fill will create a filled box. Default value is 3.

See below for the list of accepted constants.

replace

With value 1, the pixels of the painted box will overwrite the video’s color and alpha pixels. Default is 0, which composites the box onto the input video.

The parameters for x, y, w and h and t are expressions containing the following constants:

in_h, ih

in_w, iw

The input width and height.

x

y

The x and y offset coordinates where the box is drawn.

w

h

The width and height of the drawn box.

t

The thickness of the drawn box.

Examples

• Draw a black box around the edge of the input image:

  drawbox
  

• Draw a box with color red and an opacity of 50%:

  drawbox=10:20:200:60:red@0.5
  

  The previous example can be specified as:

  drawbox=x=10:y=20:w=200:h=60:color=red@0.5
  

• Fill the box with pink color:

  drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=fill
  

• Draw a 2-pixel red 2.40:1 mask:

  drawbox=x=-t:y=0.5*(ih-iw/2.4)-t:w=iw+t*2:h=iw/2.4+t*2:t=2:c=red