REVOLVER

Revolver is a digital video synthetiser. It inputs valid c++ code snippet and turns it into a values/pixels. Something similar as GLSL is doing to your screen on GPU but computed and dumped onto disk by CPU.

Q: That is crazy.. why would you do that? ..it is so much slower

A: Yup, but it is sort of tricky to get 16-bits-per-channel pixel out of your GPU ..and it is much more fun! ;)

preview

Binary Revolver

options:

• -i formula.txt setting input program textfile
• -o output.mkv setting output videofile

optional:

• -s 720x576 output size
• -f 1998x1080 actual framesize (adding letterboxes / pilarboxes to -s)
• -r 24000/1001 or i.e. -r 23.97602397602397602397 to set framerate (defaults on PAL 25)
• -p yuv444p16le setting pixelformat of the output (see ffmpeg -pix_fmts for full list)
• -t 3600 how much seconds to render i.e. -t 01:30:00 gives 1 hour and half
• -q 1 do no show live preview (render mode)

a formula file

Is basicly the body of C++ function, triggered once for each rendered pixel per frame rendered. There is some preprocessing going on which gives you following variables:

• R red pixel value
• G green pixel value
• B blue pixel value
• max default to 65535 which is maximum value in color-range in 16-bit
• x x coordinate of current pixel
• y y coordinate of current pixel
• frameCount number of frames passed
• width width of pixel area
• height height of pixel area
• pixels[] access to all pixel values

Roughly speaking any of valid C++ code is allowed here. For instance you can use math i.e. including <math.h> functions as well. If you need to extend libraries used by this snippet add them to blueprint.h file. Defining classes or other functionas are so far out of scope, it is quite easy to extend it if needed.

If the code is invalid it will prints out compiler error to console.

dependencies:

• ffmpeg swiss army knife for video
• mpv modern videoplayer
• g++ c++ compiler

build:

• git clone https://github.com/K0F/revolver
• cd revolver
• make

run:

• ./revolver -i formulas/1.txt -s 4096x2160 -p yuv444p16le -r 24 -o My4kBlockBuster.mkv

It outputs FFV1 codec in Matroška container, later you can convert such MASTER into DPX series, DCP or ProRes to use it in whatever professional video editor of your choice.

compatibility:

It works on Linux only (MacOs would possibly do as well, untested)

author:

Kryštof Pešek aka kof, 2019