scholarly journals Protecting H.264/AVC Data-Partitioned Video Streams over Broadband WiMAX

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Laith Al-Jobouri ◽  
Martin Fleury ◽  
Mohammed Ghanbari
Keyword(s):  
Video Streaming ◽  
Forward Error Correction ◽  
Video Quality ◽  
Unequal Error Protection ◽  
Data Partitioning ◽  
Video Data ◽  
Compressed Video ◽  
Error Protection ◽  
Potential Threat ◽  
Video Services

Broadband wireless technology, though aimed at video services, also poses a potential threat to video services, as wireless channels are prone to error bursts. In this paper, an adaptive, application-layer Forward Error Correction (FEC) scheme protects H.264/AVC data-partitioned video. Data partitioning is the division of a compressed video stream into partitions of differing decoding importance. The paper determines whether equal error protection (EEP) through FEC of all partition types or unequal error protection (UEP) of the more important partition type is preferable. The paper finds that, though UEP offers a small reduction in bitrate, if EEP is employed, there are significant gains (several dBs) in video quality. Overhead from using EEP rather than UEP was found to be around 1% of the overall bitrate. Given that data partitioning already reduces errors through packet size reduction and differentiation of coding data, EEP with data partitioning is a practical means of protecting user-based video streaming. The gain from employing EEP is shown to be higher quality video to the user, which will result in a greater take-up of video services. The results have implications for other forms of prioritized video streaming.

scholarly journals Application Layer Systematic Network Coding for Sliced H.264/AVC Video Streaming

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Sajid Nazir ◽  
Vladimir Stanković ◽  
Ivan Andonović ◽  
Dejan Vukobratović
Keyword(s):  
Forward Error Correction ◽  
Linear Codes ◽  
Unequal Error Protection ◽  
Video Data ◽  
Application Layer ◽  
Error Protection ◽  
Coding Scheme ◽  
Partitioned Data ◽  
Advanced Video Coding ◽  
Forward Error

Application Layer Forward Error Correction (AL-FEC) with rateless codes can be applied to protect the video data over lossy channels. Expanding Window Random Linear Codes (EW RLCs) are a flexible unequal error protection fountain coding scheme which can provide prioritized data transmission. In this paper, we propose a system that exploits systematic EW RLC for H.264/Advanced Video Coding (AVC) slice-partitioned data. The system prioritizes slices based on their PSNR contribution to reconstruction as well as temporal significance. Simulation results demonstrate usefulness of using relative slice priority with systematic codes for multimedia broadcast applications.

scholarly journals EFFICIENT MOBILE VIDEO TRANSMISSION BASED ON A JOINT CODING SCHEME

2017 ◽  
Author(s):  
Rima Boudjadja ◽  
Mohamed Azni ◽  
Abdelnasser Dahmani ◽  
Mohamed Nadjib Zennir
Keyword(s):  
Wireless Network ◽  
Error Control ◽  
Forward Error Correction ◽  
Rate Distortion ◽  
Unequal Error Protection ◽  
Data Partitioning ◽  
Video Encoding ◽  
Error Protection ◽  
Global Rate ◽  
Joint Coding

In this paper, we propose a joint coding design which uses the Symbol Forward Error Correction (S-FEC) at the application layer. The purpose of this work is on one hand to minimize the Packet Loss Rate (PLR) and, on the other hand to maximize the visual quality of video transmitted over a wireless network (WN). The scheme proposed is founded on a FEC adaptable with the semantics of the H.264/AVC video encoding. This mechanism relies upon a rate distortion algorithm, controlling the channel code rates under the global rate constraints given by the WN. Based on a data partitioning (DP) tool, both packet type and packet length are taken into account by the proposed optimization mechanism which leads to unequal error protection (UEP). The performance of the proposed JSCC unequal error control is illustrated over wireless network by performing simulations under different channel conditions. The simulation results are then compared with an equal error protection (EEP) scheme.  

Congestion Resiliency for Data-Partitioned H.264/AVC Video Streaming Over IEEE 802.11e Wireless Networks

2012 ◽  
Vol 3 (1) ◽  
pp. 55-73 ◽  
Author(s):  
Ismail Ali ◽  
Sandro Moiron ◽  
Martin Fleury ◽  
Mohammed Ghanbari
Keyword(s):  
Access Control ◽  
Video Quality ◽  
Unequal Error Protection ◽  
Data Partitioning ◽  
Ieee 802.11E ◽  
Network Access ◽  
Data Packets ◽  
Error Resiliency ◽  
Partitioned Data ◽  
The Impact

This paper examines the impact of data partitioning form on wireless network access control and proposes a selective dropping scheme based on dropping the partition carrying intra-coded macroblocks. Data partitioning is an error resiliency technique that allows unequal error protection for transmission over ‘lossy’ channels. Including a per-picture, cyclic intra-refresh macroblock line guards against temporal error propagation. The authors show that when congestion occurs, it is possible to gain up to 2 dB in video quality over assigning a stream to a single IEEE 802.11e access category. The scheme is consistently advantageous in indoor and outdoor wireless scenarios over other ways of assigning the partitioned data packets to different access categories. This counter-intuitive scheme for access control purposes reverses the priority usually given to partition-B data packets over that of partition-C.

Optimal FEC code concatenation for unequal error protection in video streaming applications

2009 ◽  
Author(s):  
Lukasz Kondrad ◽  
Imed Bouazizi ◽  
Vinod Kumar Malamal Vadakital ◽  
Moncef Gabbouj
Keyword(s):  
Video Streaming ◽  
Unequal Error Protection ◽  
Error Protection ◽  
Streaming Applications
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