“The odd uneven time.“
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README.org
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README.org
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@ -1,51 +1,52 @@
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* time, space, stacking, slicing, scanning, etc
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"Slitscan imaging techniques are used to create static images of time-based phenomena. In traditional film photography, slit scan images are created by exposing film as it slides past a slit-shaped aperture. In the digital realm, thin slices are extracted from a sequence of video frames, and concatenated into a new image."
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“Slitscan imaging techniques are used to create static images of time-based phenomena. In traditional film photography, slit scan images are created by exposing film as it slides past a slit-shaped aperture. In the digital realm, thin slices are extracted from a sequence of video frames, and concatenated into a new image.”
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[[http://www.flong.com/texts/lists/slit_scan/][An Informal Catalogue of Slit-Scan Video Artworks and Research]] Compiled by Golan Levin.
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[[slitscope_0.jpeg]]
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This particular slitscan provides some slightly configurable scaffolding around ffmpeg (based on a blogpost from [[http://oioiiooixiii.blogspot.com/2017/11/ffmpeg-temporal-slice-stacking-effect.html][oioiiooixiii]]) and is intended for non-realtime rendering at various resolutions. it's neither first, nor last. it's not especially interesting, educational or efficient. just another cloudform in the endless space of possible implementation...
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This particular slitscan provides some slightly configurable scaffolding around ffmpeg (based on a blogpost from [[http://oioiiooixiii.blogspot.com/2017/11/ffmpeg-temporal-slice-stacking-effect.html][oioiiooixiii]]) and is intended for non-realtime rendering at various resolutions. it's neither first, nor last. it's not especially interesting, educational or efficient. just another cloudform in the endless space of possible implementation…
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* installation, configuration, operation, etc
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install (mac)...
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install (macOS)…
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#+BEGIN_SRC text
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brew install ffmpeg drracket
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git clone https://github.com/zzkt/slitscan.git
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#+END_SRC
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install (debian/ubuntu)...
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install (debian/ubuntu)…
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#+BEGIN_SRC text
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sudo apt install ffmpeg racket
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git clone https://github.com/zzkt/slitscan.git
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#+END_SRC
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simple transform...
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simple transform…
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#+BEGIN_SRC text
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racket slitscan.rkt -v -i <input.mp4>
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racket slitscan.rkt -v input.mp4
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#+END_SRC
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transform at 1080p and delete working files, with minimal command line noise...
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transform at 1080p and delete working files, with minimal command line noise…
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#+BEGIN_SRC text
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racket slitscan.rkt --width 1920 --height 1080 --loglevel quiet --cleanup -i <input.mp4>
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racket slitscan.rkt --width 1920 --height 1080 --loglevel quiet --cleanup input.mp4
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#+END_SRC
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options...
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options…
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#+BEGIN_SRC text
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slitscan [ <option> ... ]
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slitscan [ <option> ... ] <video-file>
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where <option> is one of
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-v, --verbose : various verbose messages
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-l <level>, --loglevel <level> : loglevel for ffmpeg e.g. quiet, error, warning, info, debug
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-c, --cleanup : Clean up temporary/working files
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-n, --noresize : do not resize the input file
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--horizontal : output a horizontal video only (default: both)
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--vertical : output a vertical video only (default: both)
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--width <pixels> : width of output output video
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--height <pixels> : height of output output video
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-i <video>, --input <video> : input file
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-f <folder>, --folder <folder> : input folder
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--width <pixels> : width of transform video
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--height <pixels> : height of tansform video
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-f <folder>, --in-folder <folder> : input folder
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-o <folder>, --out-folder <folder> : output folder
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--help, -h : Show this help
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#+END_SRC
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77
slitscan.rkt
77
slitscan.rkt
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@ -25,7 +25,7 @@
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;;;
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;;; Requirements
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;;;
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;;; Racket, ffmpeg and zsh or bash (probably)
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;;; Racket, ffmpeg and zsh or bash (and probably works with other shells)
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;;;
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;;; Commentary
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;;;
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@ -43,10 +43,12 @@
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;; cli options
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(define filename (make-parameter ""))
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(define verbose? (make-parameter #f))
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(define cleanup? (make-parameter #f))
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(define filename (make-parameter "untitled"))
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(define input-folder (make-parameter ""))
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(define noresize? (make-parameter #f))
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(define in-folder (make-parameter ""))
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(define out-folder (make-parameter ""))
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(define loglevel (make-parameter "")) ;; leave unset by default
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;; output options horiz/vert/both
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@ -61,17 +63,21 @@
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(command-line
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#:program "slitscan"
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#:once-each
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(("-v" "--verbose") "various verbose messages" (verbose? #t))
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(("-l" "--loglevel") level "loglevel for ffmpeg e.g. quiet, error, warning, info, debug" (loglevel level))
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(("-c" "--cleanup") "Clean up temporary/working files" (cleanup? #t))
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(("--horizontal") "output a horizontal video only (default: both)" (hout-only? #t))
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(("--vertical") "output a vertical video only (default: both)" (vout-only? #t))
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(("--width") pixels "width of transform video" (output-width pixels))
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(("--height") pixels "height of tansform video" (output-height pixels))
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(("-i" "--input") video "input file" (filename video))
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(("-f" "--folder") folder "input folder" (input-folder folder))
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#:args () ; rest of the args?
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(printf "slitscanning: ~a\n" (filename))))
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(("-v" "--verbose") "various verbose messages" (verbose? #t))
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(("-l" "--loglevel") level "loglevel for ffmpeg e.g. quiet, error, warning, info, debug" (loglevel level))
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(("-c" "--cleanup") "Clean up temporary/working files" (cleanup? #t))
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(("-n" "--noresize") "do not resize the input file" (noresize? #t))
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(("--horizontal") "output a horizontal video only (default: both)" (hout-only? #t))
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(("--vertical") "output a vertical video only (default: both)" (vout-only? #t))
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(("--width") pixels "width of transform video" (output-width pixels))
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(("--height") pixels "height of tansform video" (output-height pixels))
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(("-f" "--in-folder") folder "input folder" (in-folder folder))
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(("-o" "--out-folder") folder "output folder" (out-folder folder))
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#:args (video-file) ; rest of the args?
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(filename video-file)
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(if (file-exists? (filename))
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(printf "slitscanning: ~a\n" (filename))
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(raise-user-error 'slitscan "File '~a' does not exist." (filename)))))
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;; emulation of $(...) shell syntax
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(define-syntax zout
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@ -87,11 +93,11 @@
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((and (not (verbose?)) (string=? "" (loglevel))) (loglevel "error")))
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;; variables/various
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(define folder (if (not (string=? "" (input-folder)))
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(input-folder)
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(define folder (if (not (string=? "" (in-folder)))
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(in-folder)
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(zout "mktemp -d")))
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(vecho "using folder: ~a\n" folder)
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(vecho "using folder '~a' for input\n" folder)
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;(define fffeature "ffprobe -v quiet -select_streams v -of default=noprint_wrappers=1:nokey=1 -show_entries stream=")
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@ -99,10 +105,10 @@
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;; assume most/all codecs/formats/streams have a duration
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(define duration (let ((f (string->number
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(zout (format
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"~aduration \"~a\""
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fffeature (filename))))))
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(if f f 0)))
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(zout (format
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"~aduration \"~a\""
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fffeature (filename))))))
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(if f f 0)))
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(vecho "duration: ~a seconds\n" duration)
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@ -117,10 +123,10 @@
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;; number of frames. estimate for codecs/formats/streams without nb_frames
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(define frames (let ((f (string->number
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(zout (format
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"~anb_frames \"~a\""
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fffeature (filename))))))
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(if f f (ceiling (* duration fps)))))
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(zout (format
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"~anb_frames \"~a\""
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fffeature (filename))))))
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(if f f (ceiling (* duration fps)))))
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(vecho "frames: ~a\n" frames)
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@ -143,10 +149,11 @@
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;; rezise video
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(define resized-video (string-append folder "/resized.mkv"))
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;; resize video, or copy file if 'noresize?' option is set
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(define (resize)
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(define ffmpeg-r1
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(format "ffmpeg -loglevel ~a -i \"~a\" -vf ~a -crf 10 \"~a\" 2>&1 | grep 'frame=' | tr \\n \\r; echo"
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(loglevel) (filename) scale resized-video))
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(loglevel) (filename) scale resized-video))
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(vecho "resizing video: ~a\n" resized-video)
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(system ffmpeg-r1))
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@ -199,12 +206,12 @@
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(define ffmpeg-a1 ;; horizontal frame stack
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(format
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"ffmpeg -loglevel ~a -r ~a -i ~a/horz_frame%d.png \"~a_horizontal-smear.mkv\""
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(loglevel) fps folder (filename)))
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(loglevel) fps folder (filename)))
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(define ffmpeg-a2 ;; vertical frame stack
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(format
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"ffmpeg -loglevel ~a -r ~a -i ~a/vert_frame%d.png \"~a_vertical-smear.mkv\""
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(loglevel) fps folder (filename)))
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(loglevel) fps folder (filename)))
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;; assemble
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(cond ((hout-only?) (system ffmpeg-a1))
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;; output in 3 (or 4 (or 5)) steps
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(when (resize) (printf "resized\n"))
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(when (slice) (printf "slicwd\n"))
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(when (assemble) (printf "assembled\n"))
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(when (cleanup) (printf "done\n"))
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(define (slitscan)
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(when (resize) (printf "resized\n"))
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(when (slice) (printf "sliced\n"))
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(when (assemble) (printf "assembled\n"))
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(when (cleanup) (printf "done\n")))
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;; (printf "The file '~a' does not exist.\n" (filename))
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(slitscan)
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;;; FIN
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