Introducing Video Frame Metadata
Blog post from LiveKit
LiveKit has introduced support for Frame Metadata, enhancing the synchronization of captured video or binary data frames by attaching detailed metadata such as user timestamps, frame IDs, and user data. This innovation addresses the inadequacy of standard WebRTC RTP timestamps for precise timing in applications like robotics, where synchronization with a ground-truth clock is crucial. By appending this metadata as a binary trailer before RTP packetization, Frame Metadata ensures compatibility with all video codecs supported by LiveKit and retains durability across the transport boundary. The feature allows for precise synchronization of multiple tracks to a single reference clock, enabling improved sensor alignment, accurate latency measurement, and frame-accurate data correlation without the need for separate channels. The metadata is automatically available to subscribers, and the system maintains backward compatibility by stripping trailers for clients unable to parse them. The LiveKit SDKs in Rust, Python, C++, and JavaScript now support this feature, offering a practical demonstration through the local_video example to showcase how metadata can be effectively attached and displayed in real-time video streaming scenarios.
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