Capture

Usage

capture.exe <feed_number> [device_index]
capture.exe --help

Description

Each capture instance reads video from one USB HDMI capture device using Windows Media Foundation. It converts from the device's native format (YUV422/NV12) to planar YUV420 and writes frames into the shared memory circular buffer for its feed.

What It Does

1. Opens the specified USB video device via Media Foundation
2. Requests 1920x1080 at 60fps
3. For each frame:
   • Converts YUV422 or NV12 to planar YUV420
   • Crops to 540 lines with configurable vertical offset
   • Writes to the next slot in the circular buffer
   • Signals motion detection via IPC

Device Numbering

Windows assigns device indices starting from 0 as it discovers USB video devices. The order depends on which USB controller they are connected to. If device 0 corresponds to camera feed 1, specify:

capture.exe 1 0

This writes to feed 1 using USB device 0.

See Also

• File Player — Alternative input for testing
• Hardware Setup — USB controller requirements
• Controller — Starting capture via the UI