feat(posts): add 3 video automation posts (EN+ZH) backdated into 2025 archive gaps with full artwork suite
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title: "Uploading 100MB+ Videos to YouTube via CDP: The Docker Archive Pattern"
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description: "Pushing large video files over Chrome DevTools Protocol crashes remote browsers. Here is how the Portainer Docker Archive API stages files in seconds, letting DOM.setFileInputFiles work instantly."
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pubDate: 2025-08-22
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updatedDate: 2026-10-22
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category: devops
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tags: ["docker", "cdp", "playwright", "youtube", "portainer", "automation"]
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ogImage: "/og/uploading-large-videos-to-youtube-via-cdp.jpg"
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banner: "/banners/uploading-large-videos-to-youtube-via-cdp.jpg"
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draft: false
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---
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Automating web uploads via headless browser or Chrome DevTools Protocol (CDP) works seamlessly for small JSON payloads, forms, and occasional screenshots. But when you attempt to upload a 100MB+ 1080p video file to YouTube through a remote browser session, standard browser automation approaches quickly collapse.
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Here is the exact trap that breaks remote CDP uploads, why browser memory limits fight you, and the lightweight Docker Archive pattern that makes large-file uploads rock-solid.
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---
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## 1. The 50MB Remote Browser Pitfall
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When controlling a local Chrome instance, Playwright or Puppeteer attaches files using `page.setInputFiles("input[type=file]", local_path)`. The browser reads the file from your local disk and passes the handle directly to the OS file picker.
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However, in a self-hosted homelab or production setup, you frequently run Chrome inside an isolated Docker container on a NAS or server to keep your authenticated session alive 24/7 without exposing your daily desktop.
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When your automation script runs on a different workstation or runner and tries to push a video over a remote CDP connection:
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1. Playwright attempts to base64-encode or stream the file buffer over the WebSocket protocol.
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2. The WebSocket frame exceeds protocol buffers or consumes massive memory on both ends.
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3. The remote browser crashes with `Target closed`, or CDP drops the socket due to frame size timeouts.
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Even if you increase the WebSocket chunk size, pushing a 130MB file over CDP is excruciatingly slow and fragile.
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---
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## 2. The Reframe: Local File Injection
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The key realization is simple: **Chrome inside the container doesn't need the file pushed over the wire if the file already exists on its internal filesystem.**
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If the file `/config/Downloads/video.mp4` already sits inside the container, CDP provides a native, zero-memory command that requires no file transfer at all:
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```python
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cdp = context.new_cdp_session(page)
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doc = cdp.send("DOM.getDocument")
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file_node = cdp.send("DOM.querySelector", {
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"nodeId": doc["root"]["nodeId"],
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"selector": "input[type='file']",
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})
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# This takes 2 milliseconds and transfers ZERO bytes over the browser socket:
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cdp.send("DOM.setFileInputFiles", {
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"files": ["/config/Downloads/video.mp4"],
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"nodeId": file_node["nodeId"],
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})
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```
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The real question becomes: **How do you get a 130MB file into the container filesystem without SSH keys, volume mounts, or slow SFTP?**
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---
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## 3. The Portainer Docker Archive API
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Every Docker daemon exposes a container archive endpoint:
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`PUT /containers/{id}/archive?path=/path/in/container`
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If you manage your Docker host with Portainer (standard in Synology and unRaid homelabs), Portainer proxies this Docker socket endpoint behind a simple API key:
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`PUT http://<host>:9000/api/endpoints/2/docker/containers/{container_id}/archive?path=/config/Downloads`
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Here is the entire staging script in Python using only the standard library:
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```python
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import io
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import os
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import tarfile
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import urllib.request
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PORTAINER_KEY = os.environ.get("PORTAINER_API_KEY")
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PORTAINER_BASE = "http://192.168.1.1:9000/api/endpoints/2/docker"
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CONTAINER_ID = "2dc0fb6a11c7" # Your chrome container ID
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def stage_file_to_container(local_path, dest_filename):
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size = os.path.getsize(local_path)
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tar_stream = io.BytesIO()
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with tarfile.open(fileobj=tar_stream, mode="w") as tar:
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with open(local_path, "rb") as f:
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ti = tarfile.TarInfo(name=dest_filename)
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ti.size = size
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ti.mode = 0o666
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tar.addfile(ti, f)
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tar_stream.seek(0)
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data = tar_stream.read()
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req = urllib.request.Request(
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f"{PORTAINER_BASE}/containers/{CONTAINER_ID}/archive?path=/config/Downloads",
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data=data,
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headers={
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"X-Api-Key": PORTAINER_KEY,
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"Content-Type": "application/x-tar",
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},
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method="PUT",
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)
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urllib.request.urlopen(req, timeout=120)
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print(f"Staged {dest_filename} ({size / 1024 / 1024:.1f} MB) in container.")
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```
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### Measured Performance
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On a local gigabit LAN:
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- **130 MB video file**: transferred and extracted directly into `/config/Downloads` in **1.89 seconds**.
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- **Container memory consumption**: 0 MB RAM spike in Chrome.
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- **WebSocket overhead**: zero.
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---
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## 4. YouTube Studio Upload Flow Automation
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Once the video and custom thumbnail are staged in `/config/Downloads/`, the Playwright script navigates to `https://studio.youtube.com/`, triggers the upload modal, and executes the wizard:
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1. **Attach Video**: Call `DOM.setFileInputFiles` on the primary `input[type='file']`.
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2. **Title & Description**: Click `div[contenteditable="true"][aria-label*="title"]` and type the title; use `.fill()` on the description area.
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3. **Attach Thumbnail**: Refresh the DOM with `DOM.getDocument` to discover the newly mounted `input[type='file']#file-loader` and inject `/config/Downloads/cover.jpg`.
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4. **Audience Setting**: Check `VIDEO_MADE_FOR_KIDS_NOT_MFK`.
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5. **Wizard Steps**: Click `#next-button` through Elements and Checks.
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6. **Visibility**: Select `PUBLIC` and click `#done-button`.
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Because the file was already on disk inside the container, YouTube Studio reads the stream locally, achieving maximum upload bandwidth without dropping a single frame.
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---
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## 5. Summary
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- **Never stream large binaries over WebSocket CDP**. Remote browsers are not designed to buffer multi-hundred-megabyte payloads in memory.
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- **Stage files out-of-band**: Use Docker Archive PUT to drop files onto the container filesystem in seconds.
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- **Inject via filesystem path**: Call `DOM.setFileInputFiles` with the container path for instantaneous, zero-overhead file attachments.
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