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What's the deinifition of `timestamp_us`  in the received video frame

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The `timestamp_us` field in the received video frame is an integer that represents the timestamp of the video frame in microseconds. It is part of the `VideoFrameEvent` class, which also includes the fields `frame` and `rotation`. This timestamp is included in the event data when a frame is received through a `VideoStream`, and it can also be specified when capturing a frame using `VideoSource.capture_frame()`.
 Sources: <https://docs.livekit.io/python/livekit/rtc/index.html|livekit.rtc API documentation> | <https://docs.livekit.io/python/livekit/rtc/video_stream.html|livekit.rtc.video_stream API documentation>