Designed for *nix systems. Tested on macOS only.
This code uses gcc compiler, sox utility to generate sound and ffmpeg to generate video.
Just call ./generate_video.sh.
See this youtube video: https://youtu.be/8aTE2qBm_YM
Some points of modification in Noise14.c:
12 stands for circle size.
0.5 is base frequency.
1000000. modifies time when real noise comes in.
wave1(t), wave2(t), wave3(t) and wave4(t) are harmonics on base frequency. Feel free to try them out!
Some points of modification in generate_video.sh:
SOX_BITRATE is resulting audio bitrate. Set to 8k to get more 8-bit sound.
showspectrum is described here: https://ffmpeg.org/ffmpeg-filters.html#showspectrum-1
avectorscope is described here: https://ffmpeg.org/ffmpeg-filters.html#avectorscope