## Link to GitHub Issue or related Pull Request, if one exists
fixes#875
## Description of change
Adds `-apistream`, an optional HTTP video stream of the mirrored screen.
It listens on the API port +2.
Two endpoints, sharing the same `screen`, `fps` and `q` parameters:
/stream.mjpg JPEG frames, for clients with no container support
/stream.h264 H.264 annex-b, for an app driving MediaCodec or
VideoToolbox itself
One encoder per connection, fed by a per-screen pump that always hands
over the newest frame, so a slow reader drops frames instead of building
a backlog. `capture.get_jpg` behaviour is unchanged.
Additional documentation for developers:
https://github.com/spice2x/spice2x.github.io/wiki/Video-Stream
## Testing
bicarusandGitHub