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--- photo:tilt-shift [2009/11/15 08:21]
ben created
+++ photo:tilt-shift [2010/03/06 01:54] (current)
ben
@@ Line 1: / Line 1: @@
 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:
+,5 = radii
+= angle of rotation
+,0 = sweep and some other shit, not so important
+,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|}}

..., etc.

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