PiP Twin

A second window with the same playing video for Chrome — keep your Picture-in-Picture on the monitor, send the twin fullscreen to the TV.

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PiP Twin is a Chrome extension that opens a second window with the same video playing in the tab. Chrome allows only one Picture-in-Picture window per browser, so the twin is a plain extension window with no address bar. It receives the already-decoded frames of the page <video> through captureStream(): same stream, same time, full resolution, no re-encoding. Built for watching on the work monitor while mirroring the picture onto a TV behind you.

Features

• One video on two screens — drag the small PiP around the monitor as usual, blow the twin up fullscreen on the second display.
• Same stream — captureStream() delivers decoded frames, so the picture stays in sync, at full resolution, with no second download.
• Window without an address bar — the service worker re-creates the popup as an extension window, which Chrome renders without the omnibox.
• Remembers its place — position, size and fullscreen state are saved and restored the next time you open it.
• Keyboard control — pause, seek, mute and fullscreen straight from the twin window.
• Runs locally — no accounts, nothing sent out, all code lives in the extension folder.

Install

1. Open chrome://extensions, enable Developer mode in the top right.
2. Load unpacked → pick this repository folder.

The extension is not published anywhere; it runs from the folder. Update with git pull and the Update button on its card.

Usage

On a page with a playing video, click the toolbar icon or press Alt+Shift+P. Click again to close the twin.

Key	Action
F, double-click	toggle fullscreen
Esc	leave fullscreen
Space, K	play / pause the original
← / →	seek 5 s
J / L	seek 10 s
M	mute / unmute the original
Q	close the twin

How it works

• Clicking the icon injects twin.js into every frame of the tab. The script finds the largest playing <video>, captures it with captureStream() and opens a window.
• The window is opened by the page, but the background service worker immediately re-parents it into an extension-owned popup window (chrome.windows.create, type: popup) — Chrome draws no address bar on those.
• Position and fullscreen state are kept in chrome.storage.local and restored on the next open.

Limits. DRM streams (Widevine) refuse captureStream() — regular YouTube works, paid movies do not. If a site blocks pop-ups, the icon shows !: allow pop-ups for that site and click again.

Other Projects by @timoncool

Project	Description
ScreenSavy.com	Ambient screen generator for any display
VideoSOS	AI video production in the browser
GitLife	Your life in weeks — interactive calendar
Bulka	Live-coding music platform
telegram-api-mcp	Full Telegram Bot API as an MCP server
ACE-Step Studio	AI music studio — songs, vocals, covers, videos

Authors

• Nerual Dreming — Telegram | neuro-cartel.com | ArtGeneration.me

Support the Author

I build open-source software and do AI research. Most of what I create is free and available to everyone. Your donations help me keep creating without worrying about where the next meal comes from =)

All donation methods | dalink.to/nerual_dreming | boosty.to/neuro_art

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Star History

License

MIT. findLargestPlayingVideo() is derived from GoogleChromeLabs/picture-in-picture-chrome-extension (Apache-2.0).