Add lab restream pipeline with pirate_drift logo and lib/env.sh.

Encode-once/fanout scripts, HLS output, and single overloadable env source.
Commits assets/pirate_drift.png as default watermark for cluster runs.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/env.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+# Single source of truth for pipeline variables.
+# Override: export VAR=value before running, or set in config/local.env (sourced last).
+#
+# Requires ROOT (set by lib/common.sh before this file is sourced).
+
+if [[ -z "${ROOT:-}" ]]; then
+  ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+  export ROOT
+fi
+
+# --- binaries ---
+export FFMPEG_BIN="${FFMPEG_BIN:-ffmpeg}"
+export FFPROBE_BIN="${FFPROBE_BIN:-ffprobe}"
+export YTDLP_BIN="${YTDLP_BIN:-yt-dlp}"
+
+# --- paths (logo default: assets/pirate_drift.png in repo root) ---
+export LOGO_PATH="${LOGO_PATH:-${ROOT}/assets/pirate_drift.png}"
+export PIPE_NAME="${PIPE_NAME:-.stream_pipe}"
+export PIPE_PATH="${PIPE_PATH:-${ROOT}/${PIPE_NAME}}"
+export PIPE_FIFO_SIZE="${PIPE_FIFO_SIZE:-1048576}"
+export STORAGE_DIR="${STORAGE_DIR:-${ROOT}/storage}"
+export RUN_DIR="${RUN_DIR:-${ROOT}/run}"
+export SOURCES_LIST="${SOURCES_LIST:-${ROOT}/config/sources.list}"
+export SINKS_LIST="${SINKS_LIST:-${ROOT}/config/sinks.list}"
+export HLS_OUTPUT_DIR="${HLS_OUTPUT_DIR:-}"
+
+# --- encode quality ---
+export OUTPUT_PRESET="${OUTPUT_PRESET:-1080p}"
+export FILTER_PROFILE="${FILTER_PROFILE:-default}"
+export FPS="${FPS:-30}"
+export THREADS="${THREADS:-8}"
+export THREAD_QUEUE_SIZE="${THREAD_QUEUE_SIZE:-512}"
+export RECORD_FORMAT="${RECORD_FORMAT:-mkv}"
+
+# --- ingest behaviour ---
+export YTDLP_ENABLED="${YTDLP_ENABLED:-1}"
+export NEAR_REALTIME="${NEAR_REALTIME:-1}"
+export FANOUT_RETRIES="${FANOUT_RETRIES:-5}"
+
+# optional delogo rectangle (source coords): x:y:w:h
+export DELOGO="${DELOGO:-}"
+
+# separate audio when video track has no audio
+export AUDIO_SOURCE="${AUDIO_SOURCE:-}"
+
+# --- optional file overrides (highest priority among defaults) ---
+_mp_load_env_file() {
+  local f="$1"
+  if [[ -f "${f}" ]]; then
+    set -a
+    # shellcheck disable=SC1090
+    source "${f}"
+    set +a
+  fi
+}
+_mp_load_env_file "${ROOT}/config/local.env"
+
+# Re-apply path defaults if local.env used relative paths
+export LOGO_PATH="${LOGO_PATH:-${ROOT}/assets/pirate_drift.png}"
+export PIPE_PATH="${PIPE_PATH:-${ROOT}/${PIPE_NAME}}"
+export STORAGE_DIR="${STORAGE_DIR:-${ROOT}/storage}"
+export RUN_DIR="${RUN_DIR:-${ROOT}/run}"
+export SOURCES_LIST="${SOURCES_LIST:-${ROOT}/config/sources.list}"
+export SINKS_LIST="${SINKS_LIST:-${ROOT}/config/sinks.list}"