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Debugging And Metrics

The station app tracks client-side metrics so receiver performance can be debugged without guessing.

Useful Signals​

  • USB transfer count, bytes, and errors.
  • Realtek aggregate parse count and rejected packets.
  • WFB session updates, decrypted packets, recovered fragments, and lost fragments.
  • RTP packets and extracted Annex-B frames.
  • WebCodecs decoder name, codec string, resolution, decode errors, and render FPS.
  • Bitrate and frame-rate estimates.
  • Adaptive-link RSSI, SNR, score, FEC changes, and IDR request state.

Bottleneck Strategy​

When video is not smooth, compare the stage counters in order:

  1. USB bytes arriving.
  2. Realtek packets parsed.
  3. WFB packets decrypted.
  4. RTP packets emitted.
  5. Annex-B frames extracted.
  6. WebCodecs frames decoded.
  7. Canvas frames rendered.

The first stage that stops increasing usually identifies the bottleneck or failure boundary.