blind-time-blur - Draw new frames on top of old frames with partial alpha
blind-time-blur alpha-stream
blind-time-blur reads a video from stdin and a mask video from
alpha-stream. The first frame from the video is printed to stdout as
is, and the first frame from the mask video is ignored. Succeeding frames are
drawn on top of the last frame printed to stdout, with its alpha cannel
multiplied pixel-by-pixel by the product of the luminosity and the alpha from
corresponding pixel in the mask video, and then printed stdout.
If stdin is longer than alpha-stream, the remainder of
stdin is printed without any changes. If stdin is shorter than
alpha-stream, the remainder of alpha-stream is ignored but may
be partially read.
blind(7), blind-single-colour(1), blind-gauss-blur(1)
Mattias Andrée <maandree@kth.se>