Question: In the context of Transparent end-to-end Packet-switched Streaming Service (PSS) using XML reporting format, what does the metric "Framerate" specifically indicate about video playback?
Option 1: The maximum frame rate deviation tolerated during each resolution period.
Option 2: The total number of frames played back during each resolution period.
Option 3: The average actual playback frame rate used during each resolution period, expressed in frames per second.
Option 4: The minimum required frame rate for satisfactory video quality as defined by the PSS client.
Explanation: This is correct because, according to the specifications, the "Framerate" metric in the XML reporting format of PSS indicates the average actual playback frame rate. This is a measure of how many frames are played back per second on average during each resolution period, and it can be a fractional value, allowing for precise measurement. This information is crucial for assessing the real-time performance and quality of video streaming services.