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/outputs.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+# Tee muxer targets: local file, named pipe, HLS dir, RTMP sinks list.
+set -euo pipefail
+
+# shellcheck disable=SC1091
+source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+read_sinks() {
+  SINKS=()
+  [[ -f "${SINKS_LIST}" ]] || return 0
+  while IFS= read -r line; do
+    line="${line%%#*}"
+    line="$(echo "${line}" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')"
+    [[ -n "${line}" ]] && SINKS+=("${line}")
+  done < "${SINKS_LIST}"
+}
+
+pipe_tee_entry() {
+  local pipe="$1"
+  printf "[select='v:0,a':f=flv:onfail=ignore:use_fifo=1:fifo_options='fifo_format=flv:drop_pkts_on_overflow=1:attempt_recovery=1:recovery_wait_time=1']%s" "${pipe}"
+}
+
+file_tee_entry() {
+  local path="$1"
+  local fmt="${RECORD_FORMAT}"
+  case "${fmt}" in
+    mkv) printf "[select='v:0,a':f=matroska:onfail=ignore]%s" "${path}" ;;
+    flv|*) printf "[select='v:0,a':f=flv:onfail=ignore]%s" "${path}" ;;
+  esac
+}
+
+hls_tee_entry() {
+  local dir="$1"
+  mkdir -p "${dir}"
+  printf "[select='v:0,a':f=hls:onfail=ignore:hls_time=2:hls_list_size=6:hls_flags=delete_segments+append_list]%s/index.m3u8" "${dir}"
+}
+
+rtmp_tee_entry() {
+  local url="$1"
+  printf "[select='v:0,a':f=flv:onfail=ignore]%s" "${url}"
+}
+
+# Encode stage: record + pipe (+ optional HLS). RTMP fanout is copy stage.
+build_encode_tee_spec() {
+  local record="$1"
+  local pipe="$2"
+  local parts=()
+  parts+=("$(file_tee_entry "${record}")")
+  parts+=("$(pipe_tee_entry "${pipe}")")
+  if [[ -n "${HLS_OUTPUT_DIR}" ]]; then
+    parts+=("$(hls_tee_entry "${HLS_OUTPUT_DIR}")")
+  fi
+  local IFS='|'
+  echo "${parts[*]}"
+}
+
+# Fanout stage: copy from pipe to all sinks (no re-encode).
+build_fanout_tee_spec() {
+  read_sinks
+  local parts=()
+  local s
+  for s in "${SINKS[@]}"; do
+    parts+=("$(rtmp_tee_entry "${s}")")
+  done
+  [[ ${#parts[@]} -gt 0 ]] || die "no sinks in ${SINKS_LIST}"
+  local IFS='|'
+  echo "${parts[*]}"
+}