FrameMetadata.DriverFrameFirstPacketTime Property
Contains the time at which the first packet of this frame was received by the driver.
Syntax: 
[C#]
public TimeSpan DriverFrameFirstPacketTime { get; };
Remarks:

This may be 0 if the driver does not generate timestamps.

This timestamp is created from a driver-specific time source.
Information:

Introduced in version 3.5
See also: FrameMetadata

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