How it works

Program structure

• process user input (width, height, framerate, time to capture)
• init file for raw H.264 output
• init Realsense D400 device
• init VAAPI encoder with HVE
• read greyscale IR data from the camera
• encode to H.264
• write to raw H.264 file
• cleanup

The encoding

Realsense and VAAPI devices are configured to work together (no data processing on the host).

• VAAPI is configured for H.264 with NV12 pixel format
• Realsense is configured to ouput Y8 (8 bit greyscale) infrared data
• NV12 is planar format with Y luminance plane and interleaved UV plane
  • the data output by Realsense is directly matched with Y plane of NV12
  • the UV plane is filled with constant value (no color)