How to blend tracks in melt framework?

Question

Is there any filters/transtions which could be used to blend tracks?

Answer 1

Using qtblend transition will meet the requirement.

Here is the sample which demonstrates how to apply the blend mode "darken" to tracks:

qmelt \
-video-track example1.mp4 out=:12.0 \
-video-track example2.mp4 out=:12.0 \
-transition qtblend compositing=16 in=:0.0 out=:12.0

The value of compositing which represents the blend mode is from QPainter Class.

This video is produced by Melt with crop, affine, sepia and qtblend.