For now, I just wanted to note that if a site were created to edit someone's video, it would make sense to upload the images and process them in a RAM disk on the server, processing will be much faster that way.

====== Tilt-shift a video file with ImageMagick ======

  -dump video to image files.
  -create a mask.
  -create a set of blurred images.
  -create a set of composite images created from the blurs with the mask.
  -recombine images to video file.

Steps:

  -mplayer -vo jpeg myfile.mov (or mplayer -vo png:z=0 -ao pcm:file=file.wav file)
  -convert -threshold 100% 00001.jpg -fill white -draw 'ellipse 160,160 300,40 0,360' -gaussian 35x35 +matte circle_mask.jpg;display circle_mask.jpg
  -for i in *.jpg;do convert -gaussian 3x3 $i blur/$i;done
  -for i in cropped*.jpg;do composite $i blur/$i circle_mask.jpg out/$i;done
  -mencoder "mf:\/\/out\/cropped*.jpg" -mf fps=24 -o blur_output.avi -ovc lavc -lavcopts vcodec=mpeg4 \\


That's it.

"That's it" nice.  not quite-

To get better results, a simple ellipse just isn't appropriate.  what is better may be a rotated ellipse.  To get a rotated ellipse, SVG drawing is necessary.

M: move abosolute
Z: end path
A: draw an Arc

Specs are here: http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation

something that is close:

  convert -threshold 100% koytmp/00000600.png -fill white -draw "path 'M 330,240  A 45,5  187  1,0 340,320 A 45,5  187  0,0 330,240 Z '" -depth 8 -gaussian 35x35 +matte circle_mask.png;display circle_mask.png

A values:
45,5 = radii
187 = angle of rotation
1,0 = sweep and some other shit, not so important
340,320 = endpoint x,y


Another very decent shape:

  convert -threshold 100% koytmp/00000600.png -fill white -draw "path 'M 352,340  A 10,1  187  1,1 350,260 A 10,1  187  1,1 352,340 Z '" -depth 8 +matte circle_mask.png;display circle_mask.png
  convert -threshold 100% koytmp/00000600.png -fill white -draw "path 'M 352,340  A 10,1  187  1,1 350,220 A 10,1  187  1,1 352,340 Z '" -depth 8 +matte circle_mask.png

Less blur worked better, 3x3 gauss on Koyaanisqatsi video...


To extract audio:

  mplayer -vc null -vo null -ss 2700 -frames 300 -ao pcm:file=koy300.wav Koyaanisqatsi.mkv  - frames doesn't seem to stop the dump at the appropriate place.  is there an end seconds arg?
  mplayer -vc null -vo null -ss 2700 -endpos 300 -ao pcm:file=koy300.wav Koyaanisqatsi.mkv

endpos arg note in the man page: When used in conjunction with -ss option, -endpos time will shift forward by seconds specified with -ss.
i.e. subtract ss from the absolute number of seconds for your end time.

Can't seem to combine, mplayer can at least play this one: 

  encoder "mf://out/*.png" -mf fps=24 -o koytest2.avi -audiofile koy300.wav -oac lavc -lavcopts acodec=mp2 -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=2400

----

Bezier's instead?

  convert -threshold 100% train1.png -fill white -draw "path 'M100,200 C100,100 400,100 400,200 C400,300 100,300 100,200'" -depth 8 -gaussian 15x15 +matte circle_mask.png;display circle_mask.png

M is the starting point.  First C field is first bezier control point, second field is second bezier control point, 3rd C field is the end point.  So above, 100,200 is start, 100,200 is end, and 4 control points result in a nice ellipse in the center of an image 500x365px.

This one results in a tilted ellipse, changes of -80 in x value on top, +80 in x value below:

  convert -threshold 100% train1.png -fill white -draw "path 'M100,200 C20,100 320,100 400,200 C480,300 180,300 100,200'" -depth 8 -gaussian 15x15 +matte circle_mask.png;display circle_mask.png
  convert -threshold 100% train1.png -fill white -draw "path 'M50,200 C20,80 320,80 500,200 C420,300 180,300 50,200'" -depth 8 -gaussian 35x35 +matte circle_mask.png;display circle_mask.png

The second give a shapelier sort of shape.

Decent results on file "P1030435.jpg" with- 5x5 gauss blur, mask of path "'M-300,1050 C-10,500 1600,300 1520,300 C1600,700 400,1000 180,1400'", mask blur gauss 25x25, and finally -contrast-stretch 1600x1038 -modulate 100,150,100 on the file output.

{{:p1030435sm.jpg?600|result}}
{{:p1030435sm_circle_mask_sm.jpg?600|mask}}

Would like to try changing the mask to inverted- let the background be in focus, the foreground out.

More decent results with:  
  convert -threshold 100% test.jpg -fill white -draw "path 'M100,1000 C200,600 1600,-200 1400,-200 C1400,700 400,1000 100,1000'" -depth 8 -gaussian 25x25 +matte circle_mask.jpg;open circle_mask.jpg 
and 
  convert -quality 100 -modulate 115,140,100 output.jpg outputhigh.jpg;open outputhigh.jpg &

{{:p1030435sm2.jpg?600|}}
{{:p130435sm_circle_mask_sm2.jpg?600|}}


Contrast- -contrast increases, +contrast decreases... can apply to different channels as well, need to do more reading.  This one was interesting on the above image: 
  convert -quality 100 -modulate 105,160,100 +contrast output.jpg outputhigh.jpg;open outputhigh.jpg

Not bad:
  convert -threshold 100% test.jpg -fill white -draw "path 'M-100,-150 C200,200 1400,600 1800,1000 C1800,1600 400,600 -100,100'" -depth 8 -gaussian 1x1 +matte circle_mask.jpg;open circle_mask.jpg
  convert -gaussian 25x25 circle_mask.jpg circle_mask.jpg
  composite test.jpg testblur.jpg circle_mask.jpg output.jpg;open output.jpg &
  convert -quality 100 -modulate 110,160,100 output.jpg outputhigh.jpg;open outputhigh.jpg

{{:outputhigh.jpg?900|}}
{{:circle_mask.jpg?900|}}