The Onvif plugin has always time-stamped frames as they arrive at the server. With issues of network latency and camera streaming problems, this could cause video to look jittery. An option was added to provide time-stamping with camera time. Adding #timestamp=camera in the hostname would use the presentation time provided by the camera. The default will still time-stamp frames at the server.
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Supported started with dev build 8.3.28.109905.