Automated YouTube video uploads with 12h interval scheduling in JST

This workflow automates a batch upload of multiple videos to YouTube, spacing each upload 12 hours apart in Japan Standard Time (UTC+9) and automatically adding them to a playlist.

⚙️ Workflow Logic

1. Manual Trigger — Starts the workflow manually. 2. List Video Files — Uses a shell command to find all .mp4 files under the specified directory (/opt/downloads/单词卡/A1-A2). 3. Sort and Generate Items — Sorts videos by day number (dayXX) extracted from filenames and assigns a sequential order value. 4. Calculate Publish Schedule (+12h Interval) — - Computes the next rounded JST hour plus a configurable buffer (default 30 min). - Staggers each video’s scheduled time by order × 12 hours. - Converts JST back to UTC for YouTube’s publishAt field. 5. Split in Batches (1 per video) — Iterates over each video item. 6. Read Video File — Loads the corresponding video from disk. 7. Upload to YouTube (Scheduled) — Uploads the video privately with the computed publishAtUtc. 8. Add to Playlist — Adds the newly uploaded video to the target playlist.

🕒 Highlights

- Timezone-safe: Pure UTC ↔ JST conversion avoids double-offset errors. - Sequential scheduling: Ensures each upload is 12 hours apart to prevent clustering. - Customizable: Change SPANHOURS, BUFFERMIN, or directory paths easily. - Retry-ready: Each upload and playlist step has retry logic to handle transient errors.

💡 Typical Use Cases

- Multi-part educational video series (e.g., A1–A2 English learning). - Regular content release cadence without manual scheduling. - Automated YouTube publishing pipelines for pre-produced content.

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