Method for determining quality of MPEG2-TS VBR code stream

A technology of MPEG2-TS and PCRTS, applied in the direction of TV, electrical components, image communication, etc., to achieve the effect of accurate judgment

Inactive Publication Date: 2017-01-04
DEKSCOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for VBR encoded video streams, since the stream rate is constantly changing, the above calculation method is no longer applicable

Method used

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  • Method for determining quality of MPEG2-TS VBR code stream

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Effect test

Embodiment 1

[0047] see figure 1 , the present invention discloses a method for judging the quality of an MPEG2-TS VBR code stream, detecting the quality problem of an MPEG2-TS code stream based on variable bit rate (VBR) encoding, and calculating by monitoring the PCR field of the MPEG2-TS code stream The absolute deviation between the playable duration of the received VBR video stream and the unit time, and evaluate the quality of the VBR video stream according to the absolute deviation value.

[0048] The method comprises the steps of:

[0049] [Step S1] Start sampling and set the collection period (the default is 1 second, of course it can also be other time, such as 2 seconds, 0.5 seconds, etc.).

[0050] [Step S2] Capture data packets of the MPEG2-TS code stream based on variable bit rate (VBR) encoding at the exit of the video server, at the middle point of the network or at the video terminal through the acquisition device.

[0051] [Step S3] Perform protocol analysis on the MPE...

Embodiment 2

[0058] The invention discloses a method for judging the quality of an MPEG2-TS VBR code stream, said method comprising the following steps:

[0059] 【Step S1】Start sampling and set the collection cycle;

[0060] [Step S2] Carry out data packet capture based on the MPEG2-TS code stream encoded by variable bit rate VBR at the exit of the video server, the intermediate point of the network or the video terminal through the acquisition device;

[0061] [Step S3] Carry out protocol analysis to the MPEG2-TS code stream, detect the MPEG2-TS packet that contains the program reference clock PCR, referred to as the PCR TS packet, and record in the sampling period:

[0062] The packet capture time tag T(1) of the first PCR TS packet and the PCR value PCR(1);

[0063] The packet capture time stamp T(n) of the last PCR TS packet and the PCR value PCR(n);

[0064] [Step S4] Calculate the delay coefficient value of the VBR code stream: DF_V=|(PCR(n)-PCR(1))-(T(n)-T(1))|; the above differen...

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Abstract

The invention discloses a method for determining the quality of MPEG2-TS VBR code streams. The method comprises the following steps: calculating an absolute deviation of playable duration of VBR video streams received within a unit time and the unit time by monitoring PCR fields of MPEG2-TS code streams, and evaluating the quality of the VBR code streams according to the absolute deviation. By adopting the method for determining the quality of the MPEG2-TS VBR code streams disclosed by the invention, the quality of the MPEG2-TS VBR code streams can be determined quickly and accurately.

Description

technical field [0001] The invention belongs to the technical field of multimedia communication testing, and relates to a quality judging method, in particular to a method for judging the quality of MPEG2-TS VBR stream. Background technique [0002] CBR and VBR video coding technology [0003] Traditional digital TV services (such as DVB, IPTV) generally use constant bit rate (CBR) coding technology to compress and transmit video streams. The advantage of using CBR encoding is that it is relatively easy to implement reliable video service quality assurance, and the CBR code stream has relatively low requirements for the implementation complexity of video server performance management, TV terminal buffer management, and IP bearer network flow control management. The main disadvantage of CBR encoding is that video compression efficiency is low, especially high-definition CBR video streams often need to occupy a large amount of transmission bandwidth resources. [0004] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00
Inventor 吴雪波翁昌清
Owner DEKSCOM TECH
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