The local camera preview is normal, but the far end sees intermittent blockiness and freezes that coincide with RTP packet-loss spikes. Where should analysis begin?
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Correct answer: D
A normal local preview establishes that camera capture is working before transmission. Because the far-end blockiness and freezes coincide with RTP packet-loss spikes, analysis should follow the impaired media path: quantify RTP loss and examine how the decoder recovers from missing data. Lighting, color calibration, and microphone settings do not explain this network-correlated video failure.