A pipeline that ran in production, documented so you can inspect it before you buy.

Validates the job and composes the final vertical MP4. Refuses to run while the default channel placeholder remains.

# breakage if a malformed id ever reaches this script. $WORK_DIR ends up in
# `rm -rf` later, so this guard matters.
if ! [[ "$JOB_ID" =~ ^[A-Za-z0-9_-]+$ ]]; then
  echo "ERROR: Invalid job_id: $JOB_ID"
  exit 1
fi

# Refuse to render with the default channel placeholder — otherwise every
# generated Short would carry the literal text "YOUR CHANNEL", then
# upload itself to YouTube. See Chapter 4 for setup.
if [ "$CHANNEL_NAME" = "YOUR CHANNEL" ]; then
  echo "ERROR: CHANNEL_NAME is still the placeholder."
  exit 1
fi

Watches for completed job folders and controls execution. Drains the whole queue on each event so a render never strands a job.

process_pending_jobs() {
  for f in "$JOBS_DIR"/*.json; do
    [ -f "$f" ] || continue
    JOB_ID=$(basename "$f" .json)

    # Skip malformed job ids early so they don't reach
    # process_job.sh as confusing FAILED entries.
    if ! [[ "$JOB_ID" =~ ^[A-Za-z0-9_-]+$ ]]; then
      echo "[$(date)] SKIPPED invalid job_id: $JOB_ID" >> "$DAEMON_LOG"
      continue
    fi
    "$SCRIPT" "$JOB_ID" >> "$DAEMON_LOG" 2>&1
  done
}

Handles authenticated YouTube uploads after composition. The comment is the operator's own note from the production run.

    # Reference build note:
    # chunksize=-1 uploads the MP4 in one request. This worked
    # for the 35-day production run, but very large files or
    # unstable networks may benefit from a fixed chunk size.
    # This script intentionally does not retry; the caller
    # decides policy.
    media = MediaFileUpload(
        file_path,
        chunksize=-1,
        resumable=True,
        mimetype="video/mp4",
    )