NDI MultiView & ISO Recorder

A cross-platform desktop application built with Python, PySide6 (Qt6), and FFmpeg for viewing multiple NDI network video streams in a customizable grid and recording isolated (ISO) audio/video feeds to individual .mp4 files.

---

Key Features

• Desktop-Filling Dynamic Grid ($R \times C$): Configurable from $1 \times 1$ up to $6 \times 6$. Tiles automatically scale to fill the available desktop geometry while preserving video aspect ratios.
• Carbon Fiber Interface: Procedural diagonal-weave carbon fiber texture around and between all grid slots.
• Hardware-Accelerated ISO Recording: Automatically probes FFmpeg at startup for GPU encoders (h264_nvenc, h264_qsv, h264_videotoolbox, h264_amf) with automatic fallback to libx264.
• Pause & Resume Recording: Pause and resume individual tile recordings or use Pause All during a Master Record session without splitting or closing the output .mp4 file.
• Synchronized Audio & Stereo VU Meters: Real-time Left/Right RMS dBFS audio level meters with peak-hold indicators on every tile, plus synchronized AAC audio muxing into recorded files.
• Host Computer Audio Monitoring: Route any tile's NDI audio to the host computer's speakers/headphones (Exclusive solo mode, Mix mode, or Muted) via the quick 🔊/🔇 toggle or Slot Settings.
• Multi-Tab Selection & Batch Configuration:
  • Single-click any tab to select/deselect it (Yellow border).
  • Double-click any tab to deselect all tabs.
  • Click Configure (⚙) on any selected tab to batch-edit settings across all selected tabs at once.
• Broadcast Tally Borders & HUD Overlay:
  • Red Border: Active recording tab.
  • Yellow Border: Selected tab for settings adjustment.
  • Configurable HUD: Choose between Not Shown, Use Tab Name, or Manually Entered Text, plus optional live resolution and framerate (fps) badges and an elapsed REC / PAUSED timecode counter.

---

Project Structure

ndi-multiviewer/
├── main.py            # Main window, toolbar, R×C grid manager, and carbon fiber container
├── ui_components.py   # VideoTile, VideoCanvas HUD, VUMeterWidget, HostAudioOutput, and SlotSettingsDialog
├── ndi_worker.py      # Background NDI receiver threads, GPU encoder probe, and FFmpeg TCP sockets
├── requirements.txt   # Python package dependencies
└── captures/          # Default output directory for recorded .mp4 files (created automatically)