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ultix/STREAMING.md
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mrcharles 777767db54 24x7 RTMP desktop stream, client side + UAT PASS (#798) 
Whole-screen KDE capture -> x264 -> RTMP, fenced to the rt slice.
Loopback mediamtx receiver; Cloudron cutover = one creds edit.
Detail: https://projects.knownelement.com/issues/798#note-4519

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2026-09-05 05:01:23 -05:00

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STREAMING.md — 24x7 RTMP desktop stream (reachableceo KDE, #798)

What runs where

  • ukrrs-rtmp-stream.service (system, User=reachableceo, Slice=ukrrs-rt.slice = cores 6-7, MemoryMax 4G) runs /usr/local/sbin/ukrrs-rtmp-stream.sh forever: finds the newest xorgxrdp X server owned by reachableceo, x11grabs the whole screen, encodes (x264 superfast, scaled to 1920w, ~30fps, 6M/9M VBR), captures desktop audio if a pulse monitor exists, pushes FLV/RTMP to RTMP_URL, and self-heals: session gone -> wait; display number changed -> follow; resolution changed -> restart encoder; ffmpeg died -> respawn in ~5-20s.
  • ukrrs-ultix-rtmp-rx (compose rtmp/, mediamtx 1.20.1 pinned, host net, 127.0.0.1:1935 only) = local receiver for UAT + local mirror. Everything else in mediamtx is disabled.
  • Host ffmpeg 7.1.5 is pre-installed OS tooling (ruling 2026-09-05, #798): intentionally used host-side like open-terminal (#610).

Config

  • Tunables (fps/res/bitrate/preset/user): /etc/ukrrs/rtmp-stream.env
  • Push target (SECRET once it carries a stream key): ~/.creds/rtmp-stream.env -> RTMP_URL=rtmp://host:1935/app/key Never anywhere else (not repo, not unit, not logs).
  • After editing either: systemctl restart ukrrs-rtmp-stream

Cloudron cutover (when the streaming-server details arrive)

  1. Put the ingest URL incl. stream key in ~/.creds/rtmp-stream.env (chmod 600 already; keep one RTMP_URL= line).
  2. systemctl restart ukrrs-rtmp-stream
  3. Verify: journalctl -u ukrrs-rtmp-stream -f shows LIVE: ... -> rtmp://<cloudron>

Watch it

  • Local mirror: ffplay rtmp://127.0.0.1:1935/live/desktop (or VLC).
  • Ops: systemctl status ukrrs-rtmp-stream; journalctl -u ukrrs-rtmp-stream -n 50.

Known limits (interim 8 vCPU, all measured 2026-09-05)

  • Encode is CPU-bound inside the 2-core rt-slice fence: 1920w superfast runs at ~186% of one core (93% of the fence). 2560w veryfast does NOT fit (sat the fence at ~13fps) — do not raise until post-#601.
  • x11grab on the xorgxrdp X server tops out near ~20 delivered fps on a 2816x1890 session (GetImage latency, not CPU). Static desktop looks perfect; fast full-screen motion is slightly soft. Post-#601 options: NVENC (compute cards), or 2560w veryfast on more cores.
  • After a reboot there is NO desktop until the human RDPs in (autologin off by ruling) — the streamer waits and starts on first session. That is "24x7 = whenever the desktop exists".
  • Audio rides auto_null.monitor (silent dummy) until an RDP client forwards audio; the wrapper re-picks the monitor source on every (re)start.

Files

  • staged/ukrrs-rtmp-stream.sh wrapper (installed to /usr/local/sbin)
  • staged/etc-ukrrs-rtmp-stream.env tunables template
  • staged/systemd/ukrrs-rtmp-stream.service unit
  • rtmp/ compose + mediamtx.yml + uat-creds.env (loopback UAT target)
  • 18-rtmp-stream.sh installer (idempotent, self-elevating)
  • 19-rtmp-uat.sh evidence UAT (logs/19-rtmp-uat.out + frames)
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