Question: In MBMS (Multimedia Broadcast/Multicast Service) for video streams with variable bitrate, what does the "a=X-initpredecbufperiod" attribute in SDP signaling primarily indicate to the receiver?
Option 1: The maximum allowed jitter before packet loss occurs
Option 2: The minimum required bandwidth for seamless playback
Option 3: The initial buffering delay needed to smooth out bitrate variations
Option 4: The preferred codec configuration for decoding video streams
Explanation: This attribute is crucial for receivers to understand how long they should initially buffer the stream before starting playback, ensuring a smoother viewing experience by compensating for the variable bitrate nature of video streams, especially for codecs like H.264 and H.265 (HEVC).