The growing requirement of TCP-Friendly bandwidth use by streaming video plus the proven advantages of Forward Error Correction (FEC) to combat packet loss presents the opportunity to optimize the amount of FEC in a TCP-Friendly video stream. In this paper, we derive an analytical model for predicting the playable frame rate in a TCP-Friendly MPEG stream with FEC. Our model characterizes the Group Of Pictures (GOP) and Forward Error Correction (FEC) that are part of the MPEG video transmission. Assuming a network estimate for the packet loss probability, our model incorporates TCP-Friendly throughput constraints to calculate a total playable frame rate. For a given packet loss probability, we use our model to search the variable space to find the MPEG configuration that yields the optimal playable frame rate. Analysis over a range of network conditions indicates that adjusting FEC can provide a significant performance improvement, while adjusting a well-chosen GOP will contribute little improvement. Further analysis shows that a poor choice for a GOP can result in a large degradation of the playable frame rate. Overall, by introducing moderate amounts of FEC overhead, frame rates can be improved 10 to 50 times under network conditions with moderate to high loss rates.

Download:

• Conference paper: PS (434 Kbytes)
• Conference paper: PDF (387 Kbytes)
• Slides: PPT (633 Kbytes)

See also:

• Mark Claypool and Yali Zhu. Using Interleaving to Ameliorate the Effects of Packet Loss in a Video Stream, In Proceedings of the International Workshop on Multimedia Network Systems and Applications (MNSA), Providence, RI, USA, May 2003. Online at: http://www.cs.wpi.edu/~claypool/papers/interleaving/

• Yanlin Liu and Mark Claypool. Using Redundancy to Repair Video Damaged by Network Data Loss, ACM Multimedia Computing and Networking (MMCN), San Jose, California, USA, January 25-27, 2000. Online at: http://www.cs.wpi.edu/~claypool/papers/video-redundancy/