Digital Video Transcoding

Xin, Jun; Lin, Chia‐Wen; Sun, Ming–Ting

doi:10.1109/jproc.2004.839620

Cited by 273 publications

(12 citation statements)

References 76 publications

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“…Figure 1 shows MA n l for the well-known Foreman sequence encoded at three different frame rates. 3 It is evident from the figure that the difference between them is almost unnoticeable, even if from a visual point of view the jerky effect is clearly appreciable when the frame rate is low. This is true for all the sequences where we measured MA n l .…”

Section: Jerkinessmentioning

confidence: 88%

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Variable frame rate control jerkiness-driven

Baroncini

Felice

Iacovoni

2008

J Real-Time Image Proc

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We are introducing a real-time variable frame rate control scheme capable of optimizing both spatial and temporal video qualities. It traces the motion of incoming video frames and automatically tunes the outgoing frame rate according to the level of jerkiness acceptable by the user. The control scheme was conceived within the framework of mobile communications, which require an optimum use of both the available bandwidth and terminal resources. We have designed and implemented a video transcoding architecture which supports our frame rate control. The transcoder has been developed at the Coritel laboratories, Rome, Italy (Coritel is a research consortium managed by Ericsson Lab, Italy, and the University of Rome La Sapienza), while the visual tests were carried out at the ISCOM laboratory, Italian Communication Ministry, Rome, Italy. The proposed transcoding architecture is compatible with the constraints of real-time communications and it has been extensively tested under a wide range of conditions. We then present a subjective assessment of our solution carried out in a fully equipped professional laboratory. Within this assessment a number of non-expert viewers were asked to express their preference when watching side by side the same video, coded at a variable frame rate and at a fixed frame rate. Results show that in most cases a variable frame rate control based on a dynamic bit/frame allocation scheme might substantially improve video quality perceived by viewers.

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Section: Jerkinessmentioning

confidence: 88%

“…Two updated reviews on transcoding technology architectures and techniques are [3] and [4], the former being a general survey, whereas the latter is particularly focused on mobile environments and IMS.…”

Section: Related Workmentioning

confidence: 99%

Variable frame rate control jerkiness-driven

Baroncini

Felice

Iacovoni

2008

J Real-Time Image Proc

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“…The main advantage of this approach is scalability; each peer offers resources such as bandwidth, processor and memory to other nodes. The P2P overlay network used in different applications, for example, file sharing (Cohen, 2003), video streaming (Xin et al, 2005) and video conferencing (Akkus et al, 2006). On the other hand, most P2P video conferencing systems use fluid encoding to distribute the video stream among participants as in Vanets (Hossain et al, 2009).…”

Section: Related Workmentioning

confidence: 99%

“…Vanets takes advantage of transcoding sees (Vetro et al, 2003) to allocate streaming rates optimally for all participating peers in the conference. In other words, transcoding can change the bit rate to meet the requirements of peers, as explained by (Xin et al, 2005). In transcoding, the video signal is changed by the relaying peer to meet a lower encoding rate through either re-encoding or changing key parameters such as the quantization values of Perlman (2004).…”

Section: Related Workmentioning

confidence: 99%

Peer-to-Peer Video Conferencing Using Hybrid Content Distribution Model

Jie¹

2012

Journal of Computer Science

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Problem statement: Multimedia Conferencing System (MCS) is a server-based video conferencing system. One of the most critical limitations faced by this approach is the scalability issue. In the MCS, the outgoing bandwidth of the server is shared among all concurrent clients. Thus, the more clients there are, the lesser the bandwidth each client can have. The performance of this approach therefore deteriorates rapidly as the number of simultaneous clients increases. In addition, a pure serverbased solution is expensive. Approach: In this research, the server-based infrastructure is modified into a peer-to-peer video conferencing system while preserving the same functionality and features of the existing MCS. This modification can be achieved using a hybrid content distribution model, which is a combination of fluid and chunk content distribution models to distribute parts of the video stream fairly among participants. The hybrid content distribution model offers a better way of handling heterogeneous networks because it can distinguish between a fast peer and a slow peer, dealing with each one according to its capabilities. Results: In our proposed system, the function server will not be used for video distribution. Instead, it will only be used for monitoring and controlling the peers to reduce the burden on the servers. Experimental results conducted in the nation advanced IPv6 center as a real environment and live conferencing. Conclusion: This will lead to overcome the problem of scalability and a bandwidth bottleneck on the main server and achieve good way to distribute video chunks.

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“…In (1), m is an integer variable. N and n are constant natural numbers, and n is always less than N .…”

mentioning

confidence: 99%

A Frame-Activity-Based Dynamic Frame-Skipping Transcoder

Zheng

2008

Wireless Pers Commun

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Nowadays band-limited terminals are very popular in wireless networking environments, with the result that frame-skipping technology is applied to reduce frame rate for video transmission. In this paper, we propose a dynamic frame-skipping transcoding scheme, where a frame being skipped or not is based on its activity. Whether a frame has relatively drastic motion activities or soft motion activities is evaluated among a certain number of its neighboring frames, which keeps the continuity of the transcoded sequence logically. To reduce the drift errors caused by locating overlapping blocks during the motion vector reconstruction process in multi-frame skipping, we propose a new efficient overlapping block location method. A transcoder structure with the proposed dynamic frame-skipping scheme is also designed for hardware application. Simulation shows that the proposed dynamic frameskipping scheme obtains lower complexity and higher performance, which is especially useful for real-time transcoding.

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Digital Video Transcoding

Cited by 273 publications

References 76 publications

Variable frame rate control jerkiness-driven

Variable frame rate control jerkiness-driven

Peer-to-Peer Video Conferencing Using Hybrid Content Distribution Model

A Frame-Activity-Based Dynamic Frame-Skipping Transcoder

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