Question: In a PSS session, as per QoE metrics initiation with SDP, what is the reporting frequency for video-specific QoE metrics from the beginning of the stream until a specified time?
Option 1: Every 15 seconds until 40 seconds into the stream
Option 2: Every 20 seconds throughout the entire stream
Option 3: Only once at the end of the session for both video and audio metrics
Option 4: Every 10 seconds until the end of the stream
Explanation: According to QoE metrics initiation with SDP, video-specific metrics (e.g., corruptions and decoded bytes) are monitored and reported every 15 seconds from the stream's beginning, but only until a specified time (40 seconds), for detailed, real-time monitoring of initial video quality.