Logan Cusano
ceb2836371
The recording window is anchored to OP25 control-channel timestamps, but the buffered audio lags those by roughly 1.5s. Trim logs across seven calls measured the offset at 0.84-1.62s, consistently present. At a 1.0s pad a short call closed its window before the voice arrived: a 0.97s control-channel call closed at T+1.97 while voice started around T+1.5, capturing ~0.4s of speech and cutting mid-word. Confirmed by a 0.57s file whose final 0.10s measured -12.2dB against its own -18.2dB average - clipped speech, not a tail - and by two short calls that logged no trim at all because no trailing silence remained. Being generous is free here: trim_silence already strips trailing silence back to the guard margin before upload, so long calls are unaffected while short ones gain the window they need. Over-capture costs nothing; under-capture loses words permanently. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
69 lines
2.8 KiB
Bash
69 lines
2.8 KiB
Bash
# Node Identity
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NODE_ID=node-001
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NODE_NAME="My Radio Node"
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NODE_LAT=0.0
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NODE_LON=0.0
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# MQTT — point to your C2 server
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MQTT_BROKER=localhost
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MQTT_PORT=1883
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# Must match MQTT_NODE_USER/MQTT_NODE_PASS in the server's top-level .env
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MQTT_USER=drb-node
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MQTT_PASS=change-me-node
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# C2 server for audio upload (leave blank to disable upload)
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C2_URL=http://localhost:8888
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# API key is provisioned automatically via MQTT after admin approves the node
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# Icecast (local container — usually no need to change)
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# Live listening only. Call recording and Discord voice use PulseAudio instead.
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ICECAST_SOURCE_PASSWORD=hackme
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ICECAST_ADMIN_PASSWORD=admin
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ICECAST_HOST=localhost
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ICECAST_PORT=8000
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ICECAST_MOUNT=/radio
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# PulseAudio capture (usually no need to change)
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# Monitor of the drb_sink null sink that Liquidsoap writes into.
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PULSE_SOURCE=drb_sink.monitor
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# Seconds to wait for the shared PulseAudio socket before giving up and retrying.
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PULSE_WAIT_TIMEOUT=30
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# Call segmentation: seconds of radio silence before the current recording is
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# closed. Grants on the same talkgroup within this window stay in ONE recording.
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# Tune ONLY from the "measured control-channel idle" line the edge node logs on
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# every idle-timeout close — silence measured in the audio is a different clock
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# (it also contains the ~1.9s P25 grant-to-speech delay).
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CALL_IDLE_TIMEOUT=3
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# Seconds of audio kept after the last transmission ends. This is the only
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# headroom protecting the final word of a transmission — usually the disposition
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# or the address. Raised 1.0 -> 3.0 after field measurement showed the
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# grant-to-speech offset is ~0.84-1.62s (typically ~1.5s): at 1.0s pad, short
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# calls had their recording window close before the voice even started,
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# clipping speech mid-word. Safe to be generous — trim_silence already strips
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# the extra back off long calls before upload, so only short transmissions
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# actually benefit from the larger window.
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CALL_TAIL_PAD_SECONDS=3.0
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# Strip leading/trailing dead air before upload. ~63% of an untrimmed recording
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# is silence, which costs Whisper spend and makes it hallucinate text that was
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# never spoken. Only the head and tail are touched, with a guard margin so no
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# syllable is clipped. Set to false to upload raw audio.
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TRIM_SILENCE=true
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# dBFS below which audio counts as silence for detection.
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TRIM_SILENCE_THRESHOLD_DB=-40
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# Seconds of audio kept either side of detected speech.
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TRIM_SILENCE_GUARD_SECONDS=0.25
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# OP25 container (usually no need to change)
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OP25_API_URL=http://localhost:8001
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OP25_TERMINAL_URL=http://localhost:8081
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# Container registry — set these to pull pre-built images instead of building locally.
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# Must match the DOCKER_ORG variable and repo name configured in Gitea.
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# Leave blank to always build locally.
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IMAGE_REGISTRY=git.vpn.cusano.net
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DOCKER_ORG=
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DOCKER_REPO=
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