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.TH BLIND-STACK 1 blind
.SH NAME
blind-stack - Overlay videos
.SH SYNOPSIS
.B blind-stack
[-bs]
.I bottom-stream
.RI "... " top-stream
.SH DESCRIPTION
.B blind-stack
prints the video from the file
.I bottom-stream
to stdout, but draws the videos from the
succeeding arguments on top of the video from
.IR bottom-stream ,
drawing them in order, starting with the
video specified direct after
.I bottom-stream
and ending with
.IR top-stream .
The specified files can be any type, except
directory, including pipes.
.P
The output video will be as long as the longest
input video.
.SH OPTIONS
.TP
.B -b
Instead of drawing the videos on top of each
other, for each pixel in each frame, print the
average colour for each input stream's
corresponding pixel and frame.
.TP
.B -s
The output video will be as long as the shortest
input video, rather than as the longest.
.SH SEE ALSO
.BR blind (7),
.BR blind-dissolve (1),
.BR blind-set-alpha (1),
.BR blind-single-colour (1)
.SH AUTHORS
Mattias Andrée
.RI < maandree@kth.se >
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