2 Mp4 Exclusive | Sifangds

Paper Title

Design and Evaluation of "SifangDS 2 MP4 Exclusive": A High-Efficiency Multimedia Delivery Protocol for Edge Networks

8. Experimental Setup

• Testbed:
  • Emulated cellular profiles (bandwidth 0.5–10 Mbps, RTT 30–200 ms, loss 0–5%).
  • Video set: 10 titles, 3–8 bitrate ladder, segments 2s and 4s.
• Baselines: DASH over HTTP/2 with same ABR logic; DASH+QUIC variant.
• Metrics: startup delay, average bitrate, rebuffering ratio (rebuffer time / playback time), QoE score (weighted).

2. Related Work

• Adaptive streaming: DASH, HLS, CMAF.
• Transport & signaling: QUIC, HTTP/2, WebRTC.
• Edge caching and in-network delivery.
• MP4 fragmentation and CMAF packaging.

4. SifangDS 2 Protocol Design

• Goals: minimal signaling, MP4-tailored headers, fast segment negotiation.
• Packet/Message Types:
  • HELLO (capabilities), REQ_SEG (segment id + byte-range), SEG_META (duration, bitrate, codecs), SEG_DATA (MP4 fragment), ACK/NAK.
• Transport: runs over UDP with optional QUIC fallback — rationale: lower header overhead, retransmission control.
• Reliability: selective retransmit using sequence numbers; FEC optional for lossy links.
• MP4 Packaging:
  • Use fragmented MP4 (fMP4) with moof/mdat per segment.
  • Align segment boundaries to keyframes; offer partial-byte-range fetches for fast-start.
• Security: DTLS/QUIC for confidentiality and integrity; token-based edge auth.

11. Conclusion

• SifangDS 2 MP4 Exclusive offers a practical, MP4-focused delivery approach that improves QoE in edge scenarios; prototype shows measurable improvements versus DASH baselines.