Compressed Video Communications
Compressed Video Communications
Standard Codecs: Image Compression to Advanced Video Coding
Standard Codecs: Image Compression to Advanced Video Coding
Seamless streaming media for heterogeneous mobile networks
Mobile Networks and Applications
Optimized H.264/AVC-based bit stream switching for mobile video streaming
EURASIP Journal on Applied Signal Processing
WiMAX: Technology for Broadband Wireless Access
WiMAX: Technology for Broadband Wireless Access
Switching frames for constant bit rate video streams
Proceedings of the 5th International ICST Mobile Multimedia Communications Conference
Recovery of lost or erroneously received motion vectors
ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: image and multidimensional signal processing - Volume V
Seamless switching of scalable video bitstreams for efficient streaming
IEEE Transactions on Multimedia
The H.264/MPEG4 advanced video coding standard and its applications
IEEE Communications Magazine
The SP- and SI-frames design for H.264/AVC
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
H.264/AVC in wireless environments
IEEE Transactions on Circuits and Systems for Video Technology
Adaptive streaming within the 3GPP packet-switched streaming service
IEEE Network: The Magazine of Global Internetworking
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In this paper, several error-resiliency techniques are combined with the H.264/AVC (Advanced Video Coding) codec's switching frames to adaptively switch between video streams, depending on wireless channel conditions. Switching frames are a feature of H.264/AVC that allows smooth transitions between streams without the overhead of periodic intra-coded I-frames. Because video streaming over bandwidth-limited mobile networks requires higher compression ratios, when 'lossy' channel conditions occur it is advisable to provide error resiliency at the application layer in order to avoid degradation of video quality at the receiver. In the scheme introduced in this paper, when a change in channel conditions occurs, protection to the video stream is provided by switching to an alternative stream with error resiliency protection. To accomplish stream switching to an error-resilient video stream, minimal feedback is necessary. In this way, robust streaming is confined to periods of poor channel quality, which results in up to 3-4 dB increase in video quality (PSNR) compared to using a single robust scheme over the entire session irrespective of channel conditions. In particular, this scheme appears suited to conditions of slow fading, caused by changes in the environment as a mobile device user moves from one location to another. In the paper, the response of different error resiliency techniques to error patterns (isolated or 'bursty') is determined in order to adapt in a suitable way to channel conditions. Constant Bit Rate switching frames are also implemented in this paper. Compared to the usual Variable Bit Rate switching frames, CBR frames allow low-latency and low-bandwidth video services to be supported by H.264/AVC switching frames. The robust switching stream scheme can be potentially combined with adaptive stream bitrate switching. However, the main gain at low bitrates comes not from the reduced overhead of embedded switching frames but the increase in error robustness.