A Study of Video Coding Standards for Enhancing Video Quality on Dual-Mode Mobile Devices
Date Issued
2007
Date
2007
Author(s)
Chen, Yu-Wen
DOI
en-US
Abstract
Multi-path video streaming is a solution for overcoming the limit of error-prone networks. Traditional multi-path researches focus on di®erent networking technologies such as packet scheduling. This thesis, however, compares different video coding standards such as MPEG-4 Simple Pro‾le, FGS, and H.264 with the goals of enhancing the video quality on dual mode mobile devices. We ‾rst evaluate the performance in the WiFi network. Then we discuss how to use the 3G bandwidth e±ciently to enhance the video quality on dual mode mobile devices. Because the I frame is more important than P frame in MPEG-4. The I frame is transmitted to WiFi and 3G to increase its protection. The reception of the I frame is increasing 10% and there
is an enhancement of 1 ~ 2 dB. As for FGS, it can separate a frame into the base layer and the enhancement layer. Because the base layer is much important than the enhancement layer, the base layer is transmitted into WiFi and 3G to increase the reception of the I frame. The reception of the I frame has been enhanced from 12.8% to 5%. H.264 has several error resilience tools to utilize such as FMO and data partition. FMO is one of these tools and it can separate a frame into several smaller independent slices. The I frame that is enhanced robustness by FMO is transmitted to 3G and WiFi, so the I frame loss is decreased from 15% ~ 7%.
Subjects
雙網
視訊串流
視訊編碼
dual networks
video streaming
video coding
Type
thesis