blind

suckless command-line video editing utility
git clone git://git.suckless.org/blind
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blind-time-blur.1 (957B)

      1 .TH BLIND-TIME-BLUR 1 blind
      2 .SH NAME
      3 blind-time-blur - Draw new frames on top of old frames with partial alpha
      4 .SH SYNOPSIS
      5 .B blind-time-blur
      6 .I alpha-stream
      7 .SH DESCRIPTION
      8 .B blind-time-blur
      9 reads a video from stdin and a mask video from
     10 .IR alpha-stream .
     11 The first frame from the video is printed to stdout
     12 as is, and the first frame from the mask video is
     13 ignored. Succeeding frames are drawn on top of the
     14 last frame printed to stdout, with its alpha cannel
     15 multiplied pixel-by-pixel by the product of the
     16 luminosity and the alpha from corresponding pixel
     17 in the mask video, and then printed stdout.
     18 .P
     19 If stdin is longer than
     20 .IR alpha-stream ,
     21 the remainder of stdin is printed without any changes.
     22 If stdin is shorter than
     23 .IR alpha-stream ,
     24 the remainder of
     25 .I alpha-stream
     26 is ignored but may be partially read.
     27 .SH SEE ALSO
     28 .BR blind (7),
     29 .BR blind-single-colour (1),
     30 .BR blind-gauss-blur (1)
     31 .SH AUTHORS
     32 Mattias Andrée
     33 .RI < maandree@kth.se >