Loss resilient H.263+video over the Internet

Chung-How, J.; Bull, David

doi:10.1016/s0923-5965(00)00051-5

Cited by 12 publications

(8 citation statements)

References 32 publications

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“…Still without any FEC assigned to Part 2 in this step, then . With the help of linear regression tools, we find that the following equation can fit the data of obtained with the above model-based FEC assignment algorithm well: (20) where is the ratio of the added FEC bits to the total transmitted bits (or FEC ratio); is a predefined parameter, and is found to yield good performance according to our experiments. We can see that is inversely proportional to and .…”

Section: Letmentioning

confidence: 84%

“…Thus, such protection schemes combating bit errors are only applicable to random noiselike errors, but may not be useful to packet loss in the Internet. Chung-How et al [20] proposed a loss resilient scheme for transporting video over the Internet, which only assigns FEC codes to motion part without any to texture part. Furthermore, this scheme does not provide any explicit method to determine how many FEC codes should be assigned to motion part to achieve optimal protection.…”

Section: Related Workmentioning

confidence: 99%

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An unequal packet loss resilience scheme for video over the Internet

Yang

Zhu

et al. 2005

IEEE Trans. Multimedia

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We present an unequal packet loss resilience scheme for robust transmission of video over the Internet. By jointly exploiting the unequal importance existing in different levels of syntax hierarchy in video coding schemes, GOP-level and Resynchronization-packet-level Integrated Protection (GRIP) is designed for joint unequal loss protection (ULP) in these two levels using forward error correction (FEC) across packets. Two algorithms are developed to achieve efficient FEC assignment for the proposed GRIP framework: a model-based FEC assignment algorithm and a heuristic FEC assignment algorithm. The model-based FEC assignment algorithm is to achieve optimal allocation of FEC codes based on a simple but effective performance metric, namely distortion-weighted expected length of error propagation, which is adopted to quantify the temporal propagation effect of packet loss on video quality degradation. The heuristic FEC assignment algorithm aims at providing a much simpler yet effective FEC assignment with little computational complexity. The proposed GRIP together with any of the two developed FEC assignment algorithms demonstrates strong robustness against burst packet losses with adaptation to different channel status.Index Terms-Data partitioning, error resilience, forward error correction, packet loss resilience, video over the Internet.

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Section: Letmentioning

confidence: 84%

Section: Related Workmentioning

confidence: 99%

An unequal packet loss resilience scheme for video over the Internet

Yang

Zhu

et al. 2005

IEEE Trans. Multimedia

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“…15, so that missing packets can be recovered [19]. With a video packet consisting of a Network Abstraction Layer (NAL) unit, k video packets of length L are buffered in an interleaver of depth n, and nÀ k parity packets are generated by a cross packet RS encoder.…”

Section: Cross Packet Fec Principlementioning

confidence: 99%

“…The RS decoder is able to recover up to t=nÀ k missing packets. The k video packets can then be reconstructed if any k packets are received out of the n. The main considerations in the choice of n and k are [19]:…”

Section: Cross Packet Fec Principlementioning

confidence: 99%

A video error resilience redundant slices algorithm and its performance relative to other fixed redundancy schemes

Ferré

Agrafiotis

Bull

2010

Signal Processing: Image Communication

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“…Slices provide points of temporal and spatial resynchronization, where the decoder can resume whenever the received video stream is corrupted. In adverse channel conditions, i.e., low received power, small NAL units are preferable [21], [22]. The peak-signal-to-noise ratio (PSNR) metric is used to measure the quality of a received video sequence.…”

Section: B H264 Video Standardmentioning

confidence: 99%

Robust Video Transmission Over Wireless LANs

Ferré

Doufexi

Chung-How

et al. 2008

IEEE Trans. Veh. Technol.

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Abstract-Home wireless networks are mainly used for data transmission; however, they are now being used in video delivery applications, such as video on demand or wireless internet protocol (IP) television. Off-the-shelf technologies are inappropriate for the delivery of real-time video. In this paper, a packetization method is presented for robust H.264 video transmission over the IEEE 802.11 wireless local area network (WLAN) configured as a wireless home network. To overcome the poor throughput efficiency of the IEEE 802.11 Medium Access Control (MAC), an aggregation scheme with a recovery mechanism is deployed and evaluated via simulation. The scheme maps several IP packets (each containing a single H.264 video packet called a Network Abstraction Layer (NAL) unit) into a single larger MAC frame. Video robustness is enhanced by using small NAL units and by retrieving possible error-free IP packets from the received MAC frame. The required modifications to the legacy MAC are described. Results in terms of throughput efficiency and peak-signal-to-noise ratio (PSNR) are presented for the case of broadcast and real-time transmission applications. Compared to the legacy case, an 80% improvement in throughput efficiency is achieved for a similar PSNR video performance. For fixed physical layer resources, our system provides a 2.5-dB gain in video performance over the legacy case for a similar throughput efficiency. The proposed solution provides considerable robustness enhancement for video transmission over IEEE 802.11-based WLANs.Index Terms-Medium Access Control (MAC), packetization, peaksignal-to-noise ratio (PSNR), video transmission, wireless local area networks (WLANs).

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Loss resilient H.263+video over the Internet

Cited by 12 publications

References 32 publications

An unequal packet loss resilience scheme for video over the Internet

An unequal packet loss resilience scheme for video over the Internet

A video error resilience redundant slices algorithm and its performance relative to other fixed redundancy schemes

Robust Video Transmission Over Wireless LANs

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