- https://stackoverflow.com/questions/8996194/simulate-a-directshow-webcam
- https://github.com/CatxFish/obs-virtual-cam
- https://alax.info/blog/1626
- https://stackoverflow.com/questions/8557723/virtual-webcam-input-as-byte-stream
- https://stackoverflow.com/questions/7870843/how-to-use-directshow-filter-as-a-live-input-for-expression-encoder-4
virtual directshow device