ee72d8b735
The Pi 4's two HDMI connectors share one vc4 DRM card, and DRM master is exclusive per card -- so the old per-connector-mpv design could never light the second screen (the mirror mpv died with "Failed to acquire DRM master: Permission denied"). Replace it with a minimal X server started by the mediapi-mpv unit via xinit: X is the single DRM master, xrandr --same-as clones the first output onto every other connected HDMI, and one fullscreen mpv renders to both. Uses hwdec=v4l2m2m-copy (Pi HW decoder, ~1/3 the CPU of software) and carries audio + the app's sole IPC socket. - new scripts/mediapi-session.sh (X client: waits for connectors, mirrors, execs mpv); rewritten mediapi-mpv unit (xinit on VT7) - delete scripts/start-mpv.py and all mirror-socket/broadcast code in player.py, config.py, __init__.py -- a single mpv means one socket - install.sh installs xserver-xorg-core/xinit/x11-xserver-utils, writes /etc/X11/Xwrapper.config, adds the user to input,tty - README + troubleshooting updated Verified from a cold boot on the Pi: both pixelvalve CRTCs scan the same framebuffer; app healthy; HW decode engaged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
30 lines
1.2 KiB
Text
30 lines
1.2 KiB
Text
[Unit]
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Description=mediapi player (X kiosk: one mpv mirrored across all HDMI outputs)
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# Wait until udev has settled so the DRM/HDMI devices (/dev/dri/*) exist before
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# X tries to grab them. Without this a cold-boot race can leave X unable to find
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# a screen. (systemd-udev-settle is deprecated but still the simplest reliable
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# gate here; the session script additionally waits for connectors to appear.)
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After=local-fs.target systemd-udev-settle.service
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Wants=systemd-udev-settle.service
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[Service]
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Type=simple
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User=${MEDIAPI_USER}
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# video+render: GPU/DRM access. input: evdev under X. tty: own the VT for X.
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SupplementaryGroups=video render input tty
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# A controlling tty so the X server can take over VT 7.
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TTYPath=/dev/tty7
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StandardInput=tty
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StandardOutput=journal
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StandardError=journal
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RuntimeDirectory=mediapi
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RuntimeDirectoryMode=0770
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# xinit starts the X server on VT 7 and runs the session script as its client.
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# The session mirrors the HDMI outputs (single DRM master) and execs one mpv.
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# Non-root X is permitted via /etc/X11/Xwrapper.config (installed by install.sh).
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ExecStart=/usr/bin/xinit ${PROJECT_DIR}/scripts/mediapi-session.sh -- :0 vt7 -nolisten tcp -keeptty
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Restart=on-failure
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RestartSec=2
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[Install]
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WantedBy=multi-user.target
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