Video transcoding proxy for 3Gwireless mobile Internet access

Warabino, A.; Ota, S.; Morikawa, Daisuke; Ohashi, Masayoshi; Nakamura, Hajime; Iwashita, Hideaki; Watanabe, Fumio

doi:10.1109/35.874971

Cited by 51 publications

(24 citation statements)

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“…A video proxy, located at the edge of two or more networks, adaptively transcodes video considering the network conditions and constraints of mobile users in the GPRS network. Warabino et al also propose a server-based video transcoding scheme for mobile users in [1]. The client proxy collects mobile client profiles and request transcoding to the video proxy.…”

Section: Related Workmentioning

confidence: 99%

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Streaming To Mobile Users In A Peer-to-Peer Network

Noh¹,

Makar²,

Girod³

2009

Proceedings of the 5th International Mobile Multimedia Communications Conference

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Streaming video to mobile users is rapidly emerging as a crucial multimedia service. One of the stumbling blocks in mobile streaming is the heterogeneity found in mobile devices: diverse display size, computing power, memory, and media capabilities. Given this heterogeneity, video transcoding is often required to satisfy the requirements of different mobile users. In this paper, we propose a peer-to-peer (P2P) method for mobile streaming. In the proposed method, peers other than mobile users, called fixed nodes, contribute their computing power for transcoding. We further propose the interleaved distributed transcoding (IDT) scheme that allows multiple fixed nodes to perform transcoding for a mobile device. Distributed transcoding not only lowers computation at fixed nodes, but also achieves error resilience against packet loss. The IDT scheme conforms to the H.264/ AVC baseline profile, which requires no modification to decoders found in many mobile phones. We analyzed the effect of distributed transcoding under peer churn. Extensive simulations show that mobile streaming based on the proposed scheme is robust to packet loss due to peer churn and adverse wireless channel conditions.

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Section: Related Workmentioning

confidence: 99%

“…For video, media adaptation is often achieved by video transcoding [1][2][3]. Video transcoding converts an original video bitstream to a new bitstream for a different encoding standard, smaller spatial resolution, reduced frame rate, or reduced quality (due to coarser quantization).…”

mentioning

confidence: 99%

Streaming To Mobile Users In A Peer-to-Peer Network

Noh¹,

Makar²,

Girod³

2009

Proceedings of the 5th International Mobile Multimedia Communications Conference

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“…Because mobile devices are typically limited in their battery, display size, and wireless link speed, SPPM treats the mobile devices as leeches, i.e., peers that only receive packets, but do not relay the packets to other peers. Transcoding is required to deliver video streams to individual mobile devices to suit display size, decoding capability, and download speed of the cellular network [11].…”

Section: Streaming To Mobile Peersmentioning

confidence: 99%

Stanford Peer-to-Peer Multicast (SPPM) - Overview and recent extensions

Noh

Baccichet

Hartung

et al. 2009

2009 Picture Coding Symposium

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We review the Stanford Peer-to-Peer Multicast (SPPM) protocol for live video streaming and report recent extensions. SPPM has been designed for low latency and robust transmission of live media by organizing peers within multiple complementary trees. The recent extensions to live streaming are time-shifted streaming, interactive region-of-interest (IRoI) streaming, and streaming to mobile devices. With time-shifting, users can choose an arbitrary beginning point for watching a stream, whereas IRoI streaming allows users to select an arbitrary region to watch within a high-spatial-resolution scene. We extend the live streaming to mobile devices by addressing challenges due to heterogeneous displays, connection speeds, and decoding capabilities.

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“…Middleman also considers transcoding in cooperative proxy servers [3]. Other existing approaches [5], [10], [12], [23] always consider resource utilization of the CPU, storage, and the network by proposing heuristic solutions. The TeC system [19] has proposed strategies to selectively cache original and/or transcoded objects.…”

Section: Related Workmentioning

confidence: 99%

Modeling and Optimization of Meta-Caching Assisted Transcoding

Liu

Chen²,

Shen

2008

IEEE Trans. Multimedia

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Abstract-The increase of aggregate Internet bandwidth and the rapid development of 3G wireless networks demand efficient delivery of multimedia objects to all types of wireless devices. To handle requests from wireless devices at runtime, the transcoding-enabled caching proxy has been proposed to save transcoded versions to reduce the intensive computing demanded by online transcoding. Constrained by available CPU and storage, existing transcoding-enabled caching schemes always selectively cache certain transcoded versions, expecting that many future requests can be served from the cache. But such schemes treat the transcoder as a black box, leaving no room for flexible control of joint resource management between CPU and storage. In this paper, we first introduce the idea of meta-caching by looking into a transcoding procedure. Instead of caching certain selected transcoded versions in full, meta-caching identifies intermediate transcoding steps from which certain intermediate results (called metadata) can be cached so that a fully transcoded version can be easily produced from the metadata with a small amount of CPU cycles. Achieving big saving in caching space with possibly small sacrifice on CPU load, the proposed meta-caching scheme provides a unique method to balance the utilization of CPU and storage resources at the proxy. We further construct a model to analyze the meta-caching scheme. Based on the analysis, we propose AMTrac, Adaptive Meta-caching for Transcoding, which adaptively applies meta-caching based on the client request patterns and available resources. Experimental results show that AMTrac can significantly improve the system throughput over existing approaches.

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Video transcoding proxy for 3Gwireless mobile Internet access

Cited by 51 publications

References 1 publication

Streaming To Mobile Users In A Peer-to-Peer Network

Streaming To Mobile Users In A Peer-to-Peer Network

Stanford Peer-to-Peer Multicast (SPPM) - Overview and recent extensions

Modeling and Optimization of Meta-Caching Assisted Transcoding

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