Multiple Description Video Transcoding

2007

Multimedia communications over best-effort networks ofte n involve situations in which immediate data retransmissionis either impossible (e.g., network congestion or broadcast a p- plications) or undesirable (e.g., conversational applica tions with very low delay requirements). A specific solution devel - oped for increasing the transmission reliability without i n- creasing the delay is known asmultiple description coding. In this paper, we compare four video MDC schemes based on different time splitting patterns and temporal two- or thre e- band MCTF. Taking into account the temporal distance be- tween frames, we show the respective advantages and draw- backs of these schemes, for central and side decoders.

2004

We present a system for video streaming well adapted to the unpredictable and varying nature of Internet. The proposed system uses a superposition of several Multiple Description Coding (MDC) schemes, each with N = 2 descriptions, to reach rate scalability and adaptability to varying channel conditions. Each MDC (N = 2 descriptions), that we will call base MDC has a bit rate and a redundancy associated. The superposition of several base MDC results on a MDC scheme for N > 2 descriptions with different bit rates, allowing rate scalability, for different redundancies. The proposed scheme is well adapted to varying channel conditions. In the proposed method multiple descriptions are generated by the coder and downloaded in the server, leaving to the server the only task to choose sending out the right description at the right time depending of channel conditions (bandwidth and loss rate).

2011 IEEE Vehicular Technology Conference (VTC Fall), 2011

Since multiview video communications facilitate the selection of several camera views of a given scene, it may be deemed to be a promising technique for mobile television and camera-phone networks. Similar to conventional single-view video, multiview video also suffers from packet loss events imposed by network congestion. Multiple description coding (MDC) constitutes an attractive candidate solution for mitigating the packet loss events in conventional video communications. Hence it may also be deemed to be an attractive solution for multiview video. In this paper, we propose a novel tree-structured MDC (T-MDC) scheme, which can be readily implemented with the aid of arbitrary video codecs, including multiview codecs. Moreover, the proposed philosophy enables the flexible creation of a variable number of unequal importance descriptions. Finally, we will conceive a joint multiple description coding and multiview video coding (MVC) scheme. We compare two specific tree-structured MDC schemes, namely a so-called height-one complete tree-structured MDC (HOCT-MDC) and a binary tree-structured MDC (BT-MDC) scheme, which we benchmarked against simulcasting aided single description coding in the context of both single and multiview video.

Proceedings. 2004 International Conference on Information and Communication Technologies: From Theory to Applications, 2004.

Video streaming is highly demanding in terms of processing power. When video streaming is delivered over networks subject to packet erasures, multiple description coding can be a good choice to guarantee a basic level of quality also in the presence of high congestion levels. However, most of the proposed schemes are conceived as stand-alone co-decoding algorithms, not compatible with wide spread video standards. Methods based on pre-and post-processing to standards have also been proposed, but they generally require further computational power, which could make them useless for real time applications. In this paper we propose a novel pre-and post-processing scheme that yields sensible improvement with respect to state of the art methods, in term of both performance and complexity; this makes it practical for video streaming applications.

This paper describes a new efficient and simple multiple description image coding system for the reliable communication of images in wireless communication systems. This system uses the inherent redundancy in an image to create several balanced descriptions. Each description is coded using a minimum complexity JPEG image coder and at the decoder, based on the number of received descriptions, an image with different qualities is reconstructed. The simulation results indicate the good performance of this method, particularly for wireless applications.

IEEE Transactions on Broadcasting, 2000

Providing real-time multimedia applications over wireless multi-hop networks is a challenging problem because the wireless channels are highly sensitive to delay, interference and topology changes. Multiple description coding (MDC), as a new emerging error-resilient technique, has been widely used recently in wireless video transmission. Its fundamental principle is to generate multiple correlated descriptions such that each description approximates the source

Offering a real time video transmission service, using mobile ad hoc networks (MANETs) and granting a specific Quality of Service (QoS) is a hard challenge. In fact, the network topology is extremely unstable and its variability causes the loss of transmitted information. However, powerful mechanisms against channel failures can be incorporated to avoid the system breakdown. In this paper, we evaluate the effect of Multiple Description Coding (MDC) technique for improving video quality in a multimedia content distribution system. The architecture proposed is a hybrid fixed and wireless ad hoc network where nodes can move freely. Due to multipoint to point nature of this system, multidescription can be combined with multipath transmission to increase its efficiency and, at last, the Quality of Experience (QoE) of the final receiver. The simulation lets us compare the quality of the video streaming paying attention to quality parameters (PSNR, packet delivery ratio, decodable frame rate and interruptions). Results show that MDC improves video quality in high mobility scenarios.

the video frames into odd and even frames, and encode each frame separately based on JPEG standard. We assume that each description is transmitted in through WCDMA physical layer that used in UMTS .The channel is simulated based on Gilbert/Elliot’s model. We compare the result in threes cases: Video is reconstructed using only one description; video is reconstructed using both descriptions and finally video is reconstructed based on both description, and we do error concealment as well. The video quality is reported based on average peak signal to noise ratio for all cases for video sequences.

IEEE Transactions on Circuits and Systems for Video Technology, 2002

Abstract This paper examines the effectiveness of combining multiple description coding (MDC) and multiple path transport (MPT) for video and image transmission in a multihop mobile radio network. The video and image information is encoded nonhierarchically into multiple descriptions with the following objectives. The received picture quality should be acceptable, even if only one description is received and every additional received description contributes to enhanced picture quality. Typical applications will need a higher ...

2005

Multiple description video coding mitigates the effects of packet losses introduced by congestion and/or bit errors. In this paper, we propose a novel multiple description video coding technique, based on fully scalable wavelet video coding, which allows post encoding adaptation of the number of descriptions, the redundancy level of each description, and bitrate of each description by manipulation of the encoded bitstream. We demonstrate that the proposed method provides excellent coding efficiency, outperforming most other multiple description methods proposed so far. We also provide experimental results to show that varying the number of descriptions according to network conditions is superior to using a fixed number of descriptions, by means of NS-2 network simulation of a peer-to-peer video streaming system.