Question: To avoid client-server synchronization issues in DASH (Dynamic Adaptive Streaming over HTTP) for MBMS (Multimedia Broadcast/Multicast Service), what is the recommended approach for generating segment availability times announced in the Media Presentation Description (MPD)?
Option 1: Generate segment availability times from a device synchronized to a globally accurate timing source, and include at least one UTCTiming element in the MPD.
Option 2: Allow clients to self-synchronize based on initial playback timestamps, without requiring a globally accurate timing source for the segmenter.
Option 3: Implement a periodic clock drift adjustment mechanism solely on the DASH client side to ensure synchronization with the media generation source.
Option 4: Use relative timing within the MPD, eliminating the need for both the client and server to reference an absolute, globally accurate wall-clock time.
Explanation: This approach ensures that both the client and server operate based on the same time reference, avoiding synchronization issues. Generating segment availability times from a device synchronized to a globally accurate timing source (e.g., UTC) and including a UTCTiming element in the MPD provides a common time base, enabling clients to access DASH segments at the announced times accurately.