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Method and equipment for testing stream media transmission quality

A technology for media transmission and test flow, applied in transmission systems, digital transmission systems, pulse modulated TV signal transmission, etc. It can solve problems such as the inability to intuitively reflect the buffer requirements and the lack of test methods, so as to improve the accuracy and pertinence of the test. Effect

Active Publication Date: 2009-02-18
CHINA TELECOM CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 3) The RFC 4445 DF parameter unit is ms, which cannot directly reflect the cache requirement
[0012] 4) The calculation model of RFC 4445 is only for multicast flow, and there is no specific test method for TCP-based unicast flow

Method used

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  • Method and equipment for testing stream media transmission quality
  • Method and equipment for testing stream media transmission quality
  • Method and equipment for testing stream media transmission quality

Examples

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Embodiment Construction

[0057] Exemplary embodiments of the present invention are described more fully below with reference to the accompanying drawings.

[0058] First, analyze the principle of packet loss and flow interruption caused by jitter:

[0059] At the network speed-limiting node or sink node and the receiving end, excessive jitter will cause packet loss; in addition, at the receiving end, excessive jitter will also cause current interruption.

[0060] Its principle see Figure 4a , 4b As shown, the encoding rate of the media stream is A, and the transmission rate of the media stream is B(t). In general, the average value of B(t)=A. Assuming that the network speed limit bandwidth is C, then A should be less than C.

[0061] If the network has no cache, when B(t)>C, packets will be lost, such as Figure 4a shown. If the network has a cache, when the fluctuation of B(t) is not too large, there will be no packet loss in the output media stream, such as Figure 4b However, when the fluctu...

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Abstract

The invention discloses a method and a device for testing streaming media transmission quality comprising the following steps: receiving a complete IP packet; judging whether the packet is RTP encapsulation or not, if true keeping on else returning; recording an RTP sequence number, a packet arriving time and calculating the packet length; calculating the buffer memory demands as the packet arrival according to the accumulated length of the current received packet, network limiting speed bandwidth and the time of the packet arrival; and calculating the residual media packet length in the buffer memory before the P packet arrival according to the received packet accumulated length before the current packet arrival, the media stream coding speed and the time of the packet arrival; judging whether the calculation period of an index value is arrival, if true keeping on; calculating the index value and the buffer memory overflow factors caused by the media stream whipping according to the buffer memory demands as the packet arrival; and calculating the buffer memory emptying factors caused by the media stream whipping according to the residual media packet length in the buffer memory before the packet arrival.

Description

technical field [0001] The invention relates to a streaming media service platform and Internet Protocol (IP) network technology, in particular to a method and equipment for testing the quality status of streaming media in each link of the IP network (including the streaming media sending end) during the IP network transmission process . Background technique [0002] Internet Video (IPTV) is a streaming media service provided to users over an IP network. Streaming media is different from general information browsing, but a complete, smooth and pleasing multimedia presentation, which needs to be transmitted on an IP network in an orderly, low packet loss, and stable rate. The IP network is established based on the principle of "best effort" and openness. During the network transmission process of streaming media, packet loss, delay and jitter will occur. noise, etc.) the main factor. At the same time, the media stream sent from the streaming media server will also suffer f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L12/56H04L29/06H04N7/24
Inventor 姚良肖晴陈文
Owner CHINA TELECOM CORP LTD
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