Files
sky-cam/sunrise-audio-capture.sh
T
Claude 8b9ad74c58 Fix six bugs found in final audit
montage-mvt.sh, year-end-join.sh: CAM_NAME fallback referenced undefined
\$CAM_NAME — crashes under set -euo pipefail on manual runs without args.
Fixed to fall back to \$SUNRISE_CAM (same fix applied earlier to other scripts).

notify.sh: Mattermost notification guard only checked MM_NOTIFY_CHANNEL_ID,
not mattermost_url or access_token. If those are unset, curl would send a
malformed request silently. Added guards for all three required values.

install.sh: seasons/fullday service units had literal \n in After=/Wants=
lines because bash does not interpret \n in heredoc variable expansions.
Changed to \$'...' syntax so actual newlines are written, making valid
systemd unit files. Also: audio capture timer now uses \$SCHEDULE_SUNRISE
instead of hardcoded 03:00, keeping it in sync if the user changes the
schedule.

sunrise-audio-capture.sh: record_start_sec could theoretically go negative
(sunrise very early + large SUNRISE_TARGET_SECS). Added floor-at-zero guard.

daily_sunrise_video.sh: added comment explaining why audio_offset is always 0.

README.md: fix CAM_RTSP_sunrise example to CAM_RTSP_east.

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ
2026-04-20 01:01:25 +00:00

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#!/bin/bash
# sunrise-audio-capture.sh — record exactly SUNRISE_TARGET_SECS of audio
# centred on the actual sunrise moment, so daily_sunrise_video.sh can mix in
# real ambient sound (birds, rain, wind) at natural speed.
#
# Triggered at 03:00 by sky-cam-audio-capture.timer; waits internally until
# the right moment before recording. Exits immediately if AUDIO_ENABLED≠true.
#
# Recording window: floor(TARGET/2) seconds before sunrise,
# ceil(TARGET/2) seconds after (odd second goes to post).
#
# Output: BASE_DIR/<cam>/YYYY-MM-DD/sunrise-audio.m4a
# Deleted automatically by daily_sunrise_video.sh after mixing.
set -euo pipefail
SCRIPT_DIR="$(dirname "$(realpath "$0")")"
source "$SCRIPT_DIR/sky-cam.conf"
export TZ="$TIMEZONE"
CAM="${1:-$SUNRISE_CAM}"
if [ "${AUDIO_ENABLED:-false}" != "true" ]; then
echo "AUDIO_ENABLED is not true — skipping."
exit 0
fi
rtsp_var="CAM_RTSP_${CAM}"
RTSP_URL="${!rtsp_var:-}"
if [ -z "$RTSP_URL" ]; then
echo "ERROR: CAM_RTSP_${CAM} not set in sky-cam.conf"
exit 1
fi
# ── Sunrise time ──────────────────────────────────────────────────────────────
sunrise_time=$(python3 "$SCRIPT_DIR/sunrise.py")
if [ -z "$sunrise_time" ]; then
"$SCRIPT_DIR/notify.sh" "FAILED: audio capture — no sunrise time" \
"sunrise.py returned nothing — check internet/location config" || true
exit 1
fi
sunrise_time_local=$(TZ="$TIMEZONE" date -d "$sunrise_time" +"%H:%M:%S")
echo "Sunrise (local): $sunrise_time_local"
# ── Calculate recording window centred on sunrise ─────────────────────────────
time_to_seconds() { IFS=':' read -r h m s <<< "$1"; echo $((10#$h*3600 + 10#$m*60 + 10#$s)); }
sunrise_sec=$(time_to_seconds "$sunrise_time_local")
half_pre=$(( SUNRISE_TARGET_SECS / 2 )) # floor — pre-sunrise portion
half_post=$(( SUNRISE_TARGET_SECS - half_pre )) # ceil — post-sunrise gets odd second
record_start_sec=$(( sunrise_sec - half_pre ))
[ "$record_start_sec" -lt 0 ] && record_start_sec=0
record_dur_sec=$SUNRISE_TARGET_SECS
echo "Audio window: ${half_pre}s before → ${half_post}s after sunrise (${record_dur_sec}s total)"
midnight=$(date -d "today 00:00:00" +%s)
now_day_sec=$(( $(date +%s) - midnight ))
wait_sec=$(( record_start_sec - now_day_sec ))
if [ "$wait_sec" -gt 0 ]; then
echo "Waiting ${wait_sec}s until audio window ($(date -d "@$(( midnight + record_start_sec ))" '+%H:%M:%S'))..."
sleep "$wait_sec"
fi
today=$(date +%Y-%m-%d)
dir="$BASE_DIR/$CAM/$today"
mkdir -p "$dir"
output="$dir/sunrise-audio.m4a"
echo "Recording ${record_dur_sec}s of audio → $output"
if ! ffmpeg -loglevel warning \
-rtsp_transport tcp \
-i "$RTSP_URL" \
-t "$record_dur_sec" \
-vn \
-acodec aac -b:a "${CAPTURE_AUDIO_BITRATE:-96k}" \
-y "$output"; then
"$SCRIPT_DIR/notify.sh" "FAILED: audio capture $today" \
"ffmpeg audio recording failed — sunrise video will have no audio" || true
exit 1
fi
size=$(du -h "$output" | cut -f1)
echo "Audio capture complete: $output (${record_dur_sec}s, $size)"