Cast your Steam Deck screen to any browser at 60fps. Share recordings, upload to YouTube, stream to Twitch — all from Gaming Mode.
A Decky Loader plugin that does what Steam's built-in sharing should have done from the start.
Steam Deck's built-in sharing is broken for anything serious:
| What you want | Steam's answer | DeckCast's answer | |
|---|---|---|---|
| 📺 | Cast screen to phone/TV | ❌ Not possible | ✅ Live 60fps to any browser |
| 📲 | Transfer a 20-min clip | ❌ QR code caps at 60s | ✅ Wi-Fi transfer, any size |
| 🎬 | Upload to YouTube | 😩 Desktop Mode + Chrome | ✅ One-tap from Gaming Mode |
| 💻 | Send to your PC | 🐌 "Send to PC" — up to 2 days | ✅ Instant Wi-Fi download |
| ✂️ | Trim before sharing | ❌ Nothing | ✅ Built-in trimmer, zero quality loss |
| 📡 | Live stream | ❌ Not possible | ✅ RTMP to YouTube/Twitch |
Cast your Steam Deck screen to any browser on your local network in real-time at 60fps.
One tap to start — the cast URL appears on screen. Open it on your phone, tablet, laptop, or TV browser.
- 🎮 Hardware-accelerated capture via gpu-screen-recorder + PipeWire
- 🎯 60fps with zero re-encoding overhead
- 📐 Configurable resolution (720p, 800p native, 1080p) and quality (4–12 Mbps)
- ⏱️ ~5–8 second latency over local network
- 🔴 Optional simultaneous recording while casting
- 🖥️ Browser player with volume control, fullscreen, and Picture-in-Picture
- 🔄 Cast survives plugin reloads — pick up where you left off
- 🎛️ Start/stop from the browser page or the Deck UI
Browse all your Steam recordings in one place. Game name, duration, file size, and date at a glance. Scans internal storage and SD card automatically.
Start a local web server, scan the QR code, download clips directly to your phone or PC. No internet needed, no file size caps. Supports resumable downloads and optional password protection.
Upload recordings straight to YouTube without leaving Gaming Mode. Set title, description, tags, privacy, and category. Uploads run in the background so you keep gaming.
Set start and end points, trim instantly using FFmpeg codec copy — zero quality loss, no re-encoding. Save the trimmed clip or upload it directly.
Stream gameplay to YouTube, Twitch, or any RTMP endpoint. Configure resolution, bitrate, and framerate. Save your stream key for one-tap Go Live.
Uploads, transfers, and casts keep running while you game. Come back to check progress whenever you want.
- Install Decky Loader on your Steam Deck
- Open the Quick Access Menu (
...button) - Go to the Decky tab (🔌 plug icon)
- Open the plugin store (🛍️ shopping bag icon)
- Search for DeckCast → Install
- Download
DeckCast.zipfrom Releases - Extract to
~/homebrew/plugins/DeckCast/ - Restart the plugin loader (see below)
curl -L https://github.com/dPacc/DeckCast/releases/latest/download/DeckCast.zip -o /tmp/DeckCast.zip
unzip /tmp/DeckCast.zip -d ~/homebrew/plugins/
sudo systemctl stop plugin_loader && sleep 3 && sudo systemctl start plugin_loader
⚠️ Never usesystemctl restart plugin_loader. Decky binds ports that need time to release —restartcauses a port conflict crash loop. Always use stop → sleep 3 → start.
No setup needed. Tap Start Casting → cast URL appears → open it on any device's browser.
Requirement: gpu-screen-recorder must be installed (pre-installed on most SteamOS setups):
flatpak install com.dec05eba.gpu_screen_recorderNo setup needed. Open DeckCast → Share → Start Transfer Server → scan QR code.
DeckCast uses the YouTube Data API v3. Since this is open-source, you provide your own Google API credentials (takes ~5 minutes):
Click to expand YouTube setup steps
- Go to Google Cloud Console
- Create a new project (name it anything, e.g. "DeckCast")
- APIs & Services → Library → search YouTube Data API v3 → Enable
- APIs & Services → Credentials → Create Credentials → OAuth 2.0 Client ID
- Configure the OAuth consent screen if prompted (External, add your email as test user)
- Application type: Desktop app, name: "DeckCast"
- Download JSON on the created credential
- Transfer the JSON to your Deck and save as:
~/homebrew/data/DeckCast/client_secrets.json - In DeckCast → YouTube tab → Connect YouTube Account
- Follow the on-screen instructions to authorize
Why my own credentials? Google requires OAuth credentials to be private. Since DeckCast is open source, we can't bundle them — every user creates their own free API project. This is standard practice for open-source YouTube tools.
- Go to YouTube Studio → Go Live → copy your Stream key
- In DeckCast → Stream tab → paste stream key (saved for next time)
- Configure resolution/bitrate → Go Live
Works with any RTMP endpoint — YouTube, Twitch (rtmp://live.twitch.tv/app), or custom servers.
pip install google-auth google-auth-oauthlib google-api-python-client qrcode PillowOnly needed for YouTube upload and QR code features. Live Cast and Wi-Fi Transfer work without these.
FFmpeg is pre-installed on SteamOS.
git clone https://github.com/dPacc/DeckCast.git
cd DeckCast
pnpm install
pnpm buildpnpm test # Frontend (vitest)
pip install pytest pytest-asyncio
python -m pytest tests/ -v # Backend (pytest)mkdir -p out/DeckCast
cp -r dist backend defaults assets main.py plugin.json package.json LICENSE out/DeckCast/
cd out && zip -r ../DeckCast.zip DeckCast/DeckCast/
├── main.py # Plugin entry point
├── backend/
│ ├── cast_manager.py # Live cast pipeline (GSR → FFmpeg → HLS)
│ ├── recording_scanner.py # Find and catalog recordings
│ ├── clip_trimmer.py # FFmpeg trim (codec copy)
│ ├── youtube_auth.py # YouTube OAuth 2.0
│ ├── youtube_upload.py # YouTube Data API v3
│ ├── stream_manager.py # RTMP live streaming
│ ├── transfer/
│ │ ├── server.py # Async HTTP server (port 8420)
│ │ ├── handlers.py # Route handlers (cast API, HLS, files)
│ │ └── router.py # URL routing
│ └── web/
│ └── cast.html # Browser HLS player (HLS.js)
├── src/
│ ├── index.tsx # Plugin entry (React UI + cast state)
│ ├── components/
│ │ ├── CastPanel.tsx # Cast settings
│ │ ├── RecordingBrowser.tsx # Recording list
│ │ ├── TransferPanel.tsx # Wi-Fi transfer
│ │ ├── YouTubeAuth.tsx # YouTube login
│ │ ├── YouTubeUpload.tsx # YouTube upload
│ │ ├── ClipTrimmer.tsx # Trim UI
│ │ ├── LiveStreamSetup.tsx # RTMP config
│ │ └── Settings.tsx # Plugin settings
│ ├── hooks/ # React hooks
│ ├── utils/ # API helpers, constants
│ └── types/ # TypeScript interfaces
├── docs/
│ ├── cast-pipeline.md # Cast architecture & troubleshooting
│ └── deployment.md # Build, deploy & debug guide
├── tests/ # Backend tests (pytest)
├── plugin.json # Decky plugin metadata
└── package.json # Frontend config
Does this work in Desktop Mode?
DeckCast is designed for Gaming Mode via Decky Loader. It won't appear in Desktop Mode.Can I transfer files larger than 4GB?
Yes. The Wi-Fi transfer server has no file size limit and supports resumable downloads.Do uploads count against my YouTube quota?
YouTube's free API quota is 10,000 units/day. A single upload costs ~1,600 units — about 6 videos per day. Plenty for personal use.Can I stream to Twitch instead of YouTube?
Yes. Change the RTMP URL tortmp://live.twitch.tv/app and use your Twitch stream key.
Where are my recordings stored?
Steam stores recordings in~/.local/share/Steam/userdata/<id>/gamerecordings/. DeckCast also checks ~/Videos/ and SD card paths. You can add custom paths in Settings.
The trim is instant — does it lose quality?
No. Trimming uses FFmpeg's-c copy flag which copies video/audio streams without re-encoding. Zero quality loss.
What latency does Live Cast have?
~5–8 seconds over local network. This is inherent to HLS — segments are 2 seconds each, and the player buffers 2 segments behind the live edge.- Fork the repo
- Create a feature branch (
git checkout -b feature/my-feature) - Make your changes
- Run tests (
pnpm test && python -m pytest tests/) - Submit a pull request
Issues, feature requests, and bug reports welcome on GitHub Issues.
GPL-3.0 — see LICENSE
Built with Decky Loader and the decky-plugin-template.
Born from the frustration of trying to share a 20-minute NFS Most Wanted clip from a Steam Deck. The built-in sharing breaks for long clips, "Send to PC" takes forever, and Desktop Mode kills the gaming flow. DeckCast makes sharing game clips as easy as it should be.