|
|
|
| Unequal Forced-Intra-Refresh for robust video streaming |
| LIU Hao, ZHANG Wen-jun, YANG Xiao-kang |
| Institute of Image Communication and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China |
|
|
|
Abstract For video streaming over lossy channels, intra refresh can mitigate the error-propagation effect caused by packet losses. Besides some intra-mode macroblocks (MBs) generated by the “Lagrangian rate-distortion” or “Sum of absolute difference” mode decision, the encoder or transcoder possibly needs to increase some “forced” intra-mode MBs for robust video streaming. Based on the error-propagation analysis in a group of pictures (GOP), we propose an unequal Forced-Intra-Refresh (FIR) scheme to improve packet loss resilience of video streaming. According to a GOP-level error-propagation model, the proposed unequal FIR scheme can optimally increase the unequal number of forced intra-mode MBs for different frames in a GOP. Simulation results showed that the proposed scheme can effectively enhance the robustness of video streaming under different channel conditions, and achieve about 0.1~0.9 dB gains over the average FIR scheme in H.264/AVC tools.
|
|
Received: 21 November 2005
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
