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6.1 Launch the program

• Windows: Start → FaceMP4 → “FaceMP4 Viewer”.
• macOS/Linux: Run FaceMP4 from the Applications folder or terminal.

3. System Architecture

+-------------------+         +-------------------+         +-------------------+
|   Camera Source   |  --->   |   Kaamuk Shweta   |  --->   |   FaceMP4 Engine  |
| (USB / IP / CSI) |         |   Capture Module |         | (Compressed‑Domain|
+-------------------+         +-------------------+         |   Detector)      |
          |                                          +-------------------+
          |                                               |
          v                                               v
   Raw Video Stream                               Detected Faces + Metadata
          |                                               |
          +-------------------+---------------------------+
                              |
                              v
                     Qt GUI (Live View)

• Capture Module – Handles device enumeration, format negotiation (YUV420, NV12), and MP4 muxing using FFmpeg libavformat.
• FaceMP4 Engine – Loads the facemp4.so shared library, configures the detection threshold, and processes each incoming NAL unit.
• Qt GUI – Renders the MP4 stream in a QVideoWidget, draws bounding boxes with QPainter, and exposes UI controls (camera selection, threshold, recording).

3️⃣ Install Build Dependencies

# Ubuntu/Debian
sudo apt update
sudo apt install -y \
    build-essential cmake git \
    libv4l-dev libopencv-dev \
    ffmpeg libavcodec-dev libavformat-dev libavutil-dev \
    libswscale-dev libavdevice-dev

Why these?

• libv4l-dev → low‑level video capture.
• ffmpeg libraries → MP4 muxing, H.264 encoding.
• opencv (optional) → for preview windows or image post‑processing.

7. Limitations & Future Work

| Limitation | Proposed Remedy | |------------|-----------------| | No built‑in face recognition (only detection) | Integrate FaceIDMP4 (a lightweight embedding extractor) in a future release. | | Limited to H.264/HEVC | Extend FaceMP4 to AV1 and VP9 to support newer codecs. | | UI lacks multi‑camera layout | Add a Qt‑based tiled view and dynamic layout manager. | | CPU fallback performance | Investigate TensorRT‑Lite for accelerated CPU inference. | Windows: Start → FaceMP4 → “FaceMP4 Viewer”

9️⃣ Troubleshooting Cheat‑Sheet

| Symptom | Likely Cause | Quick Fix | |---------|--------------|-----------| | No /dev/video0 | Camera not enumerated / power issue | Re‑plug USB, check dmesg, ensure 5 V/2 A supply. | | Pixelated video | Bitrate too low for resolution | Increase -b/bitrate (e.g., 8M for 4K). | | Audio missing | Facemp4 only handles video; add an external mic capture & mux with ffmpeg. | | Service won’t start | Permissions on /var/lib/facemp4 | sudo chown -R root:video /var/lib/facemp4 && sudo chmod -R 755 /var/lib/facemp4 | | Stutters at 30 fps | CPU saturation (especially on low‑end SBCs) | Lower framerate to 25 fps or use hardware‑accelerated H.264 (-hwaccel). | | RTMP connection fails | Wrong URL or firewall | Verify port 1935 open, test with ffprobe first. |

6.1. Streaming the same feed over the network

facemp4 \
  --device 0 \
  --output -               # “-” means “write to stdout” (raw H264 stream)
  --show \
  | ffmpeg -i - -c copy -f mpegts udp://239.0.0.1:1234

You can now view the stream on any device that can ingest an MPEG‑TS UDP multicast (e.g., VLC → udp://@239.0.0.1:1234).