Question: What does the 'Value' field in the 'Framerate_Deviation' metric of the '3GPP-QoE-Metrics' header indicate, and how is it calculated?
Option 1: The actual playback frame rate; Calculated as the number of frames played divided by the measurement period, multiplied by the pre-defined frame rate.
Option 2: The pre-defined frame rate value set by the server; Not calculated, but directly reported as set in the 'Measure-Spec'.
Option 3: The total number of frames played during the measurement period; Calculated without considering the pre-defined frame rate or time duration.
Option 4: The frame rate deviation from the pre-defined value; Calculated as the pre-defined frame rate minus the actual playback frame rate (in frames per second).
Explanation: The 'Value' field in the 'Framerate_Deviation' metric indicates the deviation from the expected frame rate. This deviation is calculated by subtracting the actual playback frame rate from the pre-defined frame rate, resulting in a value expressing frames per second, potentially as a fractional or negative number.