Never miss the moment. Save it after it happens.

Always-on GPU replay-buffer recorder for Windows with zero-copy D3D11 encoding, five isolated audio tracks, and zero game injection.

Download for Windows GitHub Repository
Windows 10 2004+ & 11 AV1 · HEVC · H.264 < 1% CPU · Anti-Cheat Safe
16:9 Silent Motion Showcase · .gif
SuiCap 16:9 motion showcase demonstrating hotkey replay save, zero-copy dashboard metrics, and 5-track audio mute

Compressed packets in RAM, ready on one hotkey

Keep 10 seconds to 10 minutes buffered in memory without touching disk until you press save. Presets pick the cleanest encoder path for your GPU, or switch to Custom for resolution, frame rate, codec, and quality.

Buffer length 2 min (120 s)
Up to 360 MB of memory at the maximum bitrate (24 Mbps AV1).
Replay Engine Preview av1_nvenc · 2560×1440 @ 60 fps
Max buffer RAM 360 MB
Working set 63–65 MB
Dropped 0 frames

MKV preserves named audio tracks (Mix, Mic, Game, Voice, Media) in mpv and VLC using Opus audio.

REPLAY · 120 s

Five isolated audio tracks, routed per application

WASAPI process loopback splits your game, voice chat, music players, and microphone onto separate tracks. Toggle any track below to test strict live mute — silenced tracks disappear from the Mix too.

Tracks saved to clip: Mix Mic Game Voice Media
All 5 tracks live · Click any app chip to reassign track

Mix

Combined and level-limited. Plays by default in media players.

Track 1 · Always active sources

Microphone

Follows your input automatically if unplugged and replugged.

System default mic

Game

Or follows the full-screen app in front when left empty.

Voice chat

Keep Discord or TeamSpeak separate so you can turn friends down later.

Music and media

Mute copyrighted playlists mid-session or before uploading.

PARKED

Not recorded

Apps parked here never enter any track or the Mix.

SuiCap audio routing board inside the app

Live OS detection, zero noise

Running apps surface automatically in the tray as Windows reports audio sessions. Drag an app card onto any track, drop an .exe from Explorer, or park apps in Not recorded so notifications and background streams stay out of every clip.

Switching a track off mutes its applications everywhere immediately — both on its isolated track and in the combined Mix.

Engineered for under 1% CPU and zero frame drops

Video frames stay in GPU memory from display capture to hardware encoder, avoiding CPU copies, driver locks, and game hooks.

Zero-copy D3D11 hardware pipeline

Captured frames move directly on the GPU through VideoProcessorBlt into FFmpeg D3D11 hardware surfaces, encode via NVENC, AMF, or Quick Sync, and live in a bounded GOP ring buffer until snapshot export.

1. WGC / DDA OS frame capture
2. D3D11 Blt NV12 / P010 scale
3. GPU Encode AV1 · HEVC · H.264
4. RAM Ring GOP packet buffer
5. Snapshot Mux MP4 / MKV export
0 / 108,000dropped frames (30-min soak) 63–65 MBsteady private working set ±20 msA/V QPC sync bound

Anti-cheat safe by design

No hooks inside your game process — just standard Windows capture and hotkey APIs.

  • Zero DLL injection: uses Windows Graphics Capture and Desktop Duplication only.
  • Zero keyboard hooks: global shortcuts bind via RegisterHotKey.
  • Self-recovering: rebuilds automatically if a display, window, or driver resets.

Capture a display, window, or full-screen game

Switch between Display, Application (with exact window title matching and display fallback), or Auto full-screen tracking with Ctrl+Alt+F7.

Capture Source Mode
Horizon.exe · Exact match · Ctrl+Alt+F7
SuiCap replay status and video source picker

Stealth recording badge, lossless trim & checksum updates

A click-through corner pill shows buffer status while staying excluded from clips and screenshots. The built-in Clips library trims highlights losslessly into a new copy while keeping the original intact, and self-updates verify every installer against its release checksum.

Interactive Badge Corner
Bottom right · Hidden from capture
REPLAY · 104 s
SuiCap Settings window showing General feedback and recording badge controls

Default shortcuts & quick start

Every hotkey works inside full-screen games and can be rebound, cleared, or reset. Prefer automation or headless soaks? suicap-cli shares the exact same Rust core.

Global Hotkeys Click any row to inspect

Default highlight capture: saves the last 30 seconds and flashes CLIP SAVED.

Up and running in five steps
  1. 1Install from GitHub Releases and launch SuiCap from the Windows tray.
  2. 2Press Turn on to arm the zero-copy GPU replay buffer.
  3. 3Choose Display, pick an Application, or leave on Auto.
  4. 4Drag Discord onto Voice chat and music apps onto Music and media.
  5. 5Press Ctrl+Alt+F10 after a play and trim clips directly on the Clips page.
suicap-cli & build from source 
bun install
.scripts/"SuiCap Fetch FFmpeg.bat"
bun run tauri dev
suicap-cli replay --buffer 120 --display 1