video_generator

video_generator is an explicit source that produces one constant-color raw video track. Use it when an output needs a video carrier but the real input is audio-only.

{
  "name": "carrier",
  "type": "video_generator",
  "config": {
    "width": 16,
    "height": 16,
    "fps": 15,
    "backgroundColor": "#000000"
  }
}

Field	Default	Description
width	16	Even output width, capped at the video canvas limit.
height	16	Even output height, capped at the video canvas limit.
fps	15	Frames per second, capped at 60.
backgroundColor	#000000	Constant #RRGGBB frame color.

Connect the source to a video_encoder explicitly. AVFlow never inserts a generated video stream for captions. RTMP and SRT captions require a video input; only segment can publish captions without video through its HLS WebVTT rendition.

Video encoding at 16x16 or smaller is free. Successfully delivered bytes still count toward sink egress.