MediaSampleInfo.DriverFirstPacketTime Property
The driver assigns this value when the first packet for this frame arrives.
Syntax: 
[C#]
public TimeSpan DriverFirstPacketTime { get; }
Remarks:

The value is in microseconds and is retrieved by a QueryPerformaceCounter call.

Information:

This property is deprecated since version 3.5.
Use IFrame.FrameMetadata.

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