Blend Layer X Position
blend-x
Places the blend layer image’s anchor horizontally, measured from the left edge of the picture.
A value may be given in pixels, or as a fraction from -1.0 to 1.0 of the picture. Pixel values are multiplied by dpr on a still output that honors it; dpr does not apply to video output. The point of the image being placed is set by blend-anchor, which defaults to the top-left corner.
Setting blend-x causes blend-pad to be ignored on the horizontal axis.
Aliases: blendx, bx.
Use blend-x[N] to target a specific blend layer, where N is 0–3. Layer 0 is either the bare blend-x or blend-x[0]; if both are supplied, the bare name wins.
On a still that honors dpr, pixel values are rounded to whole pixels before dpr is applied, so blend-x=10.5&dpr=2 lands at 22 pixels. Fractional values are exact.