Audio
- anullsrc
- Null audio source, never return audio frames.
Video
- buffer
- Buffer video frames, and make them available to the filter chain.
- color
- Provide an uniformly colored input.
- movie
- Read a video stream from a movie container.
- nullsrc
- Null video source, never return images.
- frei0r_src
- Provide a frei0r source.