Method for detecting quality problems of MPEG2-TS VBR (moving picture experts group-transport stream variable bit rate) code stream

A technology of MPEG2-TS, quality problems, applied in the field of multimedia communication testing

Active Publication Date: 2015-05-20
DEKSCOM TECH
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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However, for VBR encoded video streams, since the stream rate is constantly changing, the above calculation method is no longer applicable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 detecting quality problems of MPEG2-TS VBR (moving picture experts group-transport stream variable bit rate) code stream

Examples

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Embodiment 1

[0040] see figure 1 , the present invention discloses a method for detecting the quality problem of the MPEG2-TS VBR code stream, by monitoring the PCR field of the MPEG2-TS code stream to calculate the playable duration of the received VBR video stream, and simulating the terminal video buffer growth and Consumption process, and then detect video quality problems such as picture distortion or freeze based on buffer overflow or underflow events. Described detection method comprises the steps:

[0041] 【Step S1】Packet capture of the MPEG2-TS code stream based on variable bit rate VBR encoding at the video server exit, network intermediate point or video terminal through the acquisition device; initialize the playable duration BT in the video terminal buffer, BT = 0; initialize the video freeze duration FT, FT=0; set the first buffer flag Flag to 1;

[0042] [Step S2] Carry out protocol analysis to MPEG2-TS bit stream, detect the MPEG2-TS packet that contains program reference...

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Abstract

The invention discloses a method for detecting quality problems of an MPEG2-TS VBR (moving picture experts group - transport stream variable bit rate) code stream. The method comprises the following steps of enabling collecting equipment to capture a data packet on the MPEG2-TS code stream which is encoded on the basis of the VBR at a video server exit, a network intermediate point or a video terminal; performing protocol analyzing on the MPEG2-TS code stream, detecting an MPEG2-TS data packet containing a PCR (program reference clock), and calculating the time difference T between the two adjacent PCR TS packets, and the time difference Tb between the two adjacent PCR values By monitoring a PCR segment of the MPEG2-TS code stream, the playing time length of the received VBR video stream is calculated, the lengthening and consumption process of a terminal video buffer area is simulated, and then the quality problems of picture distortion or discontinuity and the like of the video can be detected by an upper overflow event or a lower overflow event of the buffer area. The method has the advantage that the quality problems of picture distortion or discontinuity and the like of the video can be effectively detected.

Description

technical field [0001] The invention belongs to the technical field of multimedia communication testing, relates to a detection method, in particular to a method for detecting quality problems of MPEG2-TS VBR code streams. Background technique [0002] 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. [0003] In recent years, with the popularity of high-r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/24H04N21/442
CPCH04N21/24H04N21/442
Inventor 吴雪波
Owner DEKSCOM TECH
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