This is a simple webcam application, which reads video from a video4linux (1 or 2) device. The images can be filtered with gmerlin filter plugins. The result can be displayed and written to image files (manually or automatically). If you have video4linux1 support, you can also make the filtered stream available as another device (via vloopback. It emulates a webcam, which supports many more pixelformats than others, because it has the conversion power of gavl behind it.