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SLAY Cart icon

SLAY Cart

LinuxWindowsVJ SLMNDI

Fire a clip. It is in OBS before you let go of the button.

Download Source Quick start ↓
SLAY Cart main window: scene tabs, a six-column touch grid of video and audio clips, and a status bar with SHM, UDP and NDI output indicators.

What it does

SLAY Cart is a clip-trigger media player for live streaming and broadcast. Build scenes from video and audio (local files, YouTube, Vimeo, direct URLs), set in and out points, and launch them on cue from a touch-friendly grid, a StreamDeck, or any HTTP or WebSocket client.

Its output goes into OBS over SLM, the SLAY Media protocol: shared memory when the player and OBS share a machine (zero-copy, no socket limits, no kernel tuning), and UDP across the network, both at once and discovered automatically. The status bar lights an SHM, UDP or NDI indicator per active receiver. In our tests the added latency measures about 1 ms over shared memory and around 3 ms to a laptop receiving over WiFi with hardware H.264; uncompressed NV12 across a gigabit LAN lands near 20 ms.

Every clip starts and ends clean, with no frozen frame and no A/V drift; audio-only clips run a native, gapless retrigger path, so hitting the same pad twice just restarts it. NDI output runs alongside SLM, so the same triggers also feed vMix, TriCaster, or anything else on the network.

Highlights

See it in action

SLAY Cart Stream Info panel showing the H.264 encoder and per-receiver latency of 1 to 3 ms.
Stream Info: live per-receiver latency — ~1 ms over SHM, ~3 ms over WiFi with H.264.
SLAY Cart Manage Clip view previewing a video with a seek bar, in/out markers, transport controls, and a filmstrip of clips.
Manage Clip: preview and trim without touching the live output.
SLAY Cart Manage Clip view for an audio clip showing a full-width waveform with in/out markers.
Real-peak waveforms with in/out markers for audio clips.
SLAY Cart showing a scene of short sample clips in the grid.
Scenes for stingers, samples, and reaction clips.
SLAY Cart main grid mixing video and audio clips with live output indicators.
Video and audio together, with live SHM / UDP / NDI output.

Quick start

  1. Get the pieces

    Download SLAY Cart and the SLM OBS Plugin.

  2. Set up OBS

    Drop the plugin into your OBS plugins folder, restart OBS, then add a SLAY Media Receiver source to your scene.

  3. Add some clips

    Launch SLAY Cart and drag in video or audio files, or paste a YouTube link to download and add it to the grid.

  4. Hit play

    Click a clip to fire it. It appears in OBS instantly over shared memory. Watch the latency readout and the SHM badge light up in the status bar.

  5. Trigger it from anything (optional)

    SLAY Cart exposes a REST API on port 7878 for StreamDeck, Bitfocus Companion, or your own scripts:

    # Play a clip by scene and name
curl http://localhost:7878/start/General/Get_in_the_Van

# Stop all playback
curl http://localhost:7878/stop

# List scenes and their clips
curl http://localhost:7878/list/scene

Requirements