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Adaptive streaming aware node, encoder and client enabling smooth quality transition

An adaptive streaming, client-side technology, applied in selective content distribution, electrical components, image communication, etc., which can solve problems such as high fluctuation of bit rate buffer fill level and quality

Inactive Publication Date: 2015-03-18
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to disclose an adaptive flow-aware network node, an adaptive flow-aware client, and a video encoder, which can significantly affect the storage capacity or processing capacity required by video servers and CDN nodes, and without affecting the required Solve the above-identified technical problems of high fluctuations in bit rate, buffer fill level and quality in conventional adaptive streaming, given the network transmission capacity

Method used

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  • Adaptive streaming aware node, encoder and client enabling smooth quality transition
  • Adaptive streaming aware node, encoder and client enabling smooth quality transition
  • Adaptive streaming aware node, encoder and client enabling smooth quality transition

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Embodiment Construction

[0049] Figure 1 illustrates the technical problems of adaptive streaming according to the prior art. Figure ID shows two adjacent quality levels 116 and 117 where video items are provided. The HAS server 101 informs the HAS client 103 of the presence of the quality classes 116 and 117 via a so-called manifest file. The bit rates associated with each of these quality levels 116 and 117 are depicted in FIG. 1A during a number of consecutive video segments, and are labeled 111 and 112, respectively. The HAS client estimates the available bandwidth or bit rate in the network 102 . The estimated available bandwidth is labeled 113 in FIG. 1B . The HAS client 103 then tries to match the bitrate 114 to the available bitrate 113 according to the estimated available bandwidth 113 by requesting consecutive video segments in the corresponding quality class. The requested quality level 118 is shown in FIG. 1E.

[0050] In the prior art, transitions between two adjacent quality versions...

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Abstract

For adaptive streaming, a video item is available in plural quality versions. Corresponding video slices (411, 421; 412, 422) in the different quality versions are pre-processed to contain bit strings for equal image portions. The client (303) can request a video segment of the video item thereby specifying in its request any arbitrary requested quality / bit rate. An adaptive streaming aware node (301) thereupon selects video slices / NAL units (431, 442) for the requested video segment proportionally from plural quality versions in a ratio matching the arbitrary requested quality. The adaptive streaming aware node (301) streams the video segment composed of the proportionally selected video slices / NAL units (431, 442) to the client (303).

Description

technical field [0001] The present invention generally relates to adaptive streaming of video segments, i.e. fixed-size or variable-size segments of a video item typically having a length of several seconds, which may be delivered in different versions or quality levels depending on available network and client resources . The invention is particularly aimed at smoothing out fluctuations in video quality, bitrate and playout buffer fill level when network or client resources vary such that the requested quality of a video item needs to be changed. Background technique [0002] Adaptive Streaming (AS) technologies are increasingly used to deliver video, like eg Hypertext Transfer Protocol (HTTP) Adaptive Streaming (HAS). The advantage of HAS is that it is easy to deploy, because it is easier than other protocols to pass through firewalls, has inherent congestion control inherited from TCP, and can use available HTTP infrastructure, such as HTTP caching nodes and content deli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04N21/2662
CPCH04N21/8451H04L65/80H04N21/23439H04L65/602H04N21/8456H04L65/4092H04L65/4084H04N21/2662H04N21/2402H04L65/613H04L65/612H04L65/762H04N19/136
Inventor D·德弗莱斯朔韦尔J·德弗里恩特D·鲁滨逊
Owner ALCATEL LUCENT SAS