Stream video content other than screen sharing

[3rd3]

Not sure whether this is within the intended scope of the project, but maybe it would be useful to be able to cast existing media streams without re-encoding, for example the output from streamlink, obs or local video files, in case they are already in the right format.
Of course it depends on what kinds of stream format the target device supports. Alternatively, one could re-encode these video sources on-the-fly.
AirPlay also appears to support playing videos from URLs via POST /play.

Restrictions to particular screens, windows or rectangles might also be interesting to consider.

[omarroth]

Would adding a -source URI option be sufficient for this use-case? I am aware of the other endpoint but I'm not quite sure how to integrate that cleanly with the current implementation.

[3rd3]

-source URI sounds like a good idea to cover local files and directly accessible URLs, perhaps with a -input-mode=transcode|passthrough flag. -source - could be used to read stdin, e.g. Streamlink normally pipes its output to mpv/VLC via stdin., An optional format option -input-format if GStreamer fails to auto-detect.

Interaction could be achieved via the ctl:

doubletake-ctl pause
doubletake-ctl seek -30s
doubletake-ctl seek 01:24:00
doubletake-ctl live
doubletake-ctl status

For stdin streams and URL streams, it might be neat to to have a disk-backed demuxer cache like in mpv (e.g. --demuxer-cache=yes --demuxer-cache-on-disk=no --demuxer-max-bytes=10GiB --demuxer-max-back-bytes=10GiB) to be able to pause, replay and seek.

Just some ideas.