Streaming Feed has become one of the most used utility now-a-days. Starting from Home-Security to Business Surveillance, streaming feed is utilized everywhere. However, due to unstable network bandwidth, frequent buff...
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ISBN:
(纸本)9781509000777
Streaming Feed has become one of the most used utility now-a-days. Starting from Home-Security to Business Surveillance, streaming feed is utilized everywhere. However, due to unstable network bandwidth, frequent buffering and delay occurrence usually creates degraded user experience. One of the ways to avoid this is to use Adaptive Bitrate Streaming. Among various protocols supporting this Adaptive Feed, HTTP Live Streaming (HLS) has become one of the most famous commercially used protocol choices. The main advantage achieved via this is the ability to provide support for different device categories (in terms of maximum resolution or maximum bitrate the device can support) as well as supporting of various video qualities depending upon network condition. But the downside of using HLS is the introduction of transcoding delay in Live Feed. In this paper, we are proposing Dynamic transcoding algorithm for HLS by optimizing the delay and providing a near live experience to a vast number of differently capable devices at the same time without violating the principles of the specification. Based on our experimental results, we will show that, using the proposed methodology, we can achieve better user experience by providing best suitable video with current network condition apart from supporting varied kind of devices at the same time.
We derive compact systolic structures for the transcoding of critically sampled modulated lapped transforms (MLT's) of equal and rational sizes. The structures include two modules for DCT-IV computation and an int...
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ISBN:
(纸本)9781424442966
We derive compact systolic structures for the transcoding of critically sampled modulated lapped transforms (MLT's) of equal and rational sizes. The structures include two modules for DCT-IV computation and an intermediate module for all windowing/reordering operations. The proposed structure is highly regular and provides theoretical and practical insights for this transcoding problem.
The latest generations in mobile networks have enabled a possibility to include high quality audio coding in data transmission. On the other hand, an on-going e ort to move the audio signal processing from dedicated h...
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The latest generations in mobile networks have enabled a possibility to include high quality audio coding in data transmission. On the other hand, an on-going e ort to move the audio signal processing from dedicated hardware to data centers with generalized hardware introduces a challenge of providing enough computational power needed by the virtualized network elements. This thesis evaluates the usage of a modern hybrid audio codec called Opus in a virtualized network element. It is performed by integrating the codec, testing it for functionality and performance on a general purpose processor, as well as evaluating the performance in comparison to the digital signal processor's performance. Functional testing showed that the codec was integrated successfully and bit compliance with the Opus standard was met. The performance results showed that although the digital signal processor com- putes the encoder's algorithms with less clock cycles, related to the processor's whole capacity the general purpose processor performs more e ciently due to higher clock frequency. For the decoder this was even clearer, when the generic hardware spends on average less clock cycles for performing the algorithms.
H. 264/AVC adopts 9 intra 4x4 prediction modes to improve the intra frame compression efficiency. This makes the intra frame coding and transcoding very complex. In this paper, a fast intra 4x4 mode decision algorithm...
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ISBN:
(纸本)9780819482341
H. 264/AVC adopts 9 intra 4x4 prediction modes to improve the intra frame compression efficiency. This makes the intra frame coding and transcoding very complex. In this paper, a fast intra 4x4 mode decision algorithm is proposed to reduce the intra transcoding complexity. Firstly, the surrounding modes in the high bitrate and the modes of the neighboring blocks in the current bitrate are used to form the candidate modes. Secondly, the variance and mean of the intra prediction residual are used to further reduce the size of the candidate mode set. Thirdly, the intra mode context model is built from the high bitrate modes and updated by the low bitrate modes to order the candidate modes. An early skip scheme is used to terminate the mode decision process. Experimental results show that about 50% intra 4x4 modes can be saved with a penalty on coding efficiency less than 0.1dB. The transcoding performance can even gain up to 0.6 dB on some sequences.
Mobile devices have the limited environment such as low process performance, small screen size, low network speed and restricted user interface. This situation prevented the use of diverse and rich desktop-based infor...
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ISBN:
(纸本)9783642176036
Mobile devices have the limited environment such as low process performance, small screen size, low network speed and restricted user interface. This situation prevented the use of diverse and rich desktop-based information and services because the user could use limited services in mobile telecommunication environment. Also, this demands that service providers should develop a separate web contents for mobile telecommunication, but it is a waste of time and effort. Therefore, in this paper, we proposed web contents transcoding middleware that could provide automatic web contents re-authoring for the mobile device.
Scalable Video Coding (SVC) enables low complexity adaptation according to transmission and display requirements, providing an efficient solution for video content delivery through heterogeneous networks. However, leg...
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Scalable Video Coding (SVC) enables low complexity adaptation according to transmission and display requirements, providing an efficient solution for video content delivery through heterogeneous networks. However, legacy video and most commercially available content capturing devices use conventional non-scalable coding, e.g., H.264/AVC, to compress and store video streams. As a consequence and in order to fully exploit the advantages of SVC technology, efficient transcoding from conventionally coded to scalable content is urgently needed. In this paper an efficient transcoder from H.264/AVC to a wavelet-based SVC is proposed. The complexity of the transcoder is kept very low by using information extracted directly from the decoded H.264/AVC bitstream, such as motion vectors and the presence of residual data. The proposed approach has been tested with well known benchmarking sequences, showing a good performance in terms of decoded video quality and system complexity.
A new combined video content protection approach is proposed and experimentally evaluated. In this approach reliability information obtained during watermark extraction process is used for improving the accuracy of tr...
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A new combined video content protection approach is proposed and experimentally evaluated. In this approach reliability information obtained during watermark extraction process is used for improving the accuracy of traitor tracing procedure.
Content Delivery Networks have become commonly used by content providers such as Netflix to deliver TV programmes to a large number of customers. This solution however breaks down when intensive processing is required...
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Content Delivery Networks have become commonly used by content providers such as Netflix to deliver TV programmes to a large number of customers. This solution however breaks down when intensive processing is required and when content cannot be stored ahead of time, as is the case with live (real time) content. We study here resource management issues when a cloud infrastructure is used to deliver live content. More specifically, we look at the allocation of machines to host servers and how to keep that number as small as possible while meeting user demand. We express the problem as an online bin packing model and show how, by exploiting a simple property of the media, we can derive an efficient solution.
This paper proposes a new approach for performing the secure video transcoding based on correlation preserving sorting algorithm. The idea is to perform the transcoding operation without decrypting the encrypted video...
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This paper proposes a new approach for performing the secure video transcoding based on correlation preserving sorting algorithm. The idea is to perform the transcoding operation without decrypting the encrypted video content. Correlation preserving sorting algorithm is adopted here to encrypt the video data. In this method, the first frame and the frames at which the correlation coefficient between the current frame and the previous frame is less than a threshold value are transmitted through a secure channel. The video frames are sorted and the sorted frames are encoded by using any video coding standard. It is proposed to perform the transcoding operation on the sorted frames of the video. The proposed secure video transcoding system is validated through the popular video coding standard s MPEG2 and H.264. From experiments, it is p roved that the proposed system gives better compression performance and security with minimal complexity of operations.
In previous studies, we proposed and developed a CloudDMSS (Cloud-based distributed multimedia streaming service) system. To provide reliable streaming service in the CloudDMSS, a distribution streaming system was est...
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In previous studies, we proposed and developed a CloudDMSS (Cloud-based distributed multimedia streaming service) system. To provide reliable streaming service in the CloudDMSS, a distribution streaming system was established using streaming task distribution algorithms, RR (Round Robin), and LC (Least Connection). However, as the RR and LC methods did not consider the utilization or streaming transmission rate of the streaming servers, it negatively affected the load on the servers. Therefore, to improve the capability of our CloudDMSS, this study proposes a streaming task distribution method using an SRC(Streaming Resource-based Connection) algorithm that considers the utilization of the streaming server.
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