# Sources

[alphaextract, alphamerge tutorial](https://hhsprings.bitbucket.io/docs/programming/examples/ffmpeg/manipulating_video_colors/alphamerge_alphaextract.html)

[alphaextract, alphamerge tutorial 2](https://hhsprings.bitbucket.io/docs/programming/examples/ffmpeg/manipulating_video_colors/alphamerge_alphaextract_more_.html)

[maskedmerge tutorial](https://hhsprings.bitbucket.io/docs/programming/examples/ffmpeg/manipulating_video_colors/maskedmerge.html)

[maskedmerge turorial 2](http://oioiiooixiii.blogspot.com/2016/09/ffmpeg-extract-foreground-moving.html)