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mediamtx: substitute hostname/IP before start #977

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mediamtx: substitute hostname/IP before start #977

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f759948
mediamtx: substitute hostname/IP into yaml before start
babo989 Jun 18, 2026
b46ccf9
mediamtx: use runOnInit instead of ExecStartPre for yaml substitution
babo989 Jun 25, 2026
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8 changes: 6 additions & 2 deletions os/mediamtx/mediamtx.service
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Original file line number Diff line number Diff line change
@@ -1,10 +1,14 @@
# https://mediamtx.org/docs/usage/start-on-boot#linux

[Unit]
After=network.target
Wants=network.target
After=network-online.target
Wants=network-online.target

[Service]
# The hostname/IP substitution into /etc/mediamtx.yaml is driven by the
# `runOnInit` hook in the YAML itself (see os/mediamtx/mediamtx.yaml), so it
# also runs when mediamtx is started outside systemd (e.g. `just dev`).
# network-online.target is kept so the wired IP is available when that runs.
ExecStart=/usr/local/bin/mediamtx /etc/mediamtx.yaml

[Install]
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5 changes: 5 additions & 0 deletions os/mediamtx/mediamtx.yaml
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Expand Up @@ -37,3 +37,8 @@ paths:
alwaysAvailable: true
alwaysAvailableTracks:
- codec: H264
# Rewrite this file's placeholder hostname/IP (above) with the device's real
# values at startup, so WebRTC ICE candidates resolve regardless of how
# mediamtx was launched (systemd, `just dev`, manual). mediamtx watches the
# config file and hot-reloads after the rewrite. See lib/mediamtx.js.
runOnInit: /usr/bin/node /opt/PlanktoScope/lib/mediamtx.js