How to Create WebRTC Publisher Clients with Adaptive Live Encoding

WebRTC publisher-side adaptive bitrate control helps maintain live streams during changing uplink conditions by monitoring network statistics and dynamically lowering or restoring video quality without renegotiating the session. Using Red5 Pro’s WHIPClient and HTML SDK, the example collects outbound video and candidate-pair statistics every second, calculates interval-based packet-loss and PLI/FIR keyframe-request rates from cumulative counters, and tracks round-trip time. A StatsMonitor identifies sustained degradation or recovery through configurable thresholds and consecutive-sample requirements, avoiding reactions to temporary spikes. When degradation is confirmed, it updates the video RTCRtpSender’s encoding parameters with setParameters() to reduce maximum bitrate and resolution scale, then restores the target settings after several healthy samples. Testing should use separate publisher and subscriber devices with simulated delay or loss, focusing on uninterrupted end-to-end delivery rather than the publisher preview. The two-state implementation is intended as a starting point, with production systems potentially requiring multiple quality levels, cooldowns, receiver-side measurements, browser-specific validation, and coordination with server-side ABR strategies.

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