CN104639955B - The method for detecting MPEG2 TS VBR code stream quality problems - Google Patents
The method for detecting MPEG2 TS VBR code stream quality problems Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
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Abstract
Present invention is disclosed a kind of method of detection MPEG2 TS VBR code stream quality problems, comprise the following steps：Packet capture is carried out to the MPEG2 TS code streams encoded based on variable bit rate VBR in video server outlet, network intermediate point or video terminal by collecting device；Protocol analysis is carried out to MPEG2 TS code streams, detects to include Program Clock Reference PCR MPEG2 TS packets, calculates the time difference Ta of two adjacent PCR TS bags, and calculate the time difference Tb of the two adjacent PCR values.The present invention can calculate the playable duration of the VBR video flowings received by monitoring the PCR fields of MPEG2 TS code streams, and pseudo-terminal screen buffer increases and consumption process, then detects that the quality problems such as distortion or interim card occurs in video according to buffer overflow or underflow event.The method of detection MPEG2 TS VBR code stream quality problems proposed by the present invention, can effectively detect that the quality problems such as distortion or interim card occurs in video.
Description
Technical field
The invention belongs to multimedia communication technical field of measurement and test, it is related to a kind of detection method, more particularly to a kind of detection
The method of MPEG2-TS VBR code stream quality problems.
Background technology
Compressed traditional digital television business (such as DVB, IPTV) using constant bit rate (CBR) coding techniques and
Transmitting video-frequency flow.To be easier to realize reliable Video service quality assurance using the CBR advantages encoded, CBR code streams to regarding
The implementation complexity requirement of the flow-control administration of the performance management of frequency server, the buffer management of television terminal and IP bearer networks
It is all relatively low.The major defect of CBR codings is that video compression efficiency is relatively low, and especially high definition CBR video flowings generally require to account for
With substantial amounts of transmission bandwidth resource.
In recent years, with the popularization of high-resolution liquid crystal TV, people are also more next to the demand for watching HD video program
It is more vigorous.On the other hand, new video coding technique and standard (as H.264, H.265) are also continued to bring out, and these new technologies are more
Variable bit rate (VBR) coding techniques is employed more to improve compression and the efficiency of transmission of video.Using VBR coding techniques,
The coding of high compression ratio can be realized with relatively low code check for the programme content (such as news hookup) of relative quiescent, and for the back of the body
Scape picture needs to realize that coding just can guarantee that the clear of picture with higher code check if switching frequently program (such as competitive sports)
Degree.Because the code check amplitude of variation of VBR video flowings is larger, this realization to video server, IP bearer networks, television terminal is complicated
Degree and performance management propose higher requirement.
Traditional MDI standards have been not fully appropriate for VBR code streams.The MPEG2-TS used for traditional IPTV
(Transport Stream " transport stream "；Also known as TS, TP, MPEG-TS or M2T) CBR code streams video quality test, IETF marks
Standardization tissue has issued RFC 4445MDI specifications.Two parameters of main definitions in MDI standards：That is media loss rate
And retardation coefficient (DF) (MLR).
MDI:MLR media loss rates can simply be defined as the number for losing the media data packet of (or improper) each second
Amount.When MLR is non-zero, then means that the part audio-video frequency content in this MPEG2-TS code stream is lost or impaired, generally result in picture
Face distortion (such as mosaic, flower screen) phenomenon.According to its test philosophy, MLR test indexs are all same for CBR and VBR code streams
Applicable.
MDI:DF retardation coefficients are a time values, represent the buffering area of set top box and must accommodate how many milliseconds of data
Media dither flow can be eliminated.The parameter is actually the fluctuation situation for reflecting video stream bit rate, and code check is more constant, then MDI:DF
Value is smaller；It is on the contrary then bigger.If MDI:DF value is excessive, has exceeded the tolerance limit of set top box buffering area, may result in buffering
Area's overflow or underflow.Buffer overflow can cause the loss of media data packet, cause distortion；Buffer underflow can cause nothing
Bit stream data is available for decoding, causes picture interim card.For normal CBR video flowings, MDI:DF value is generally kept in less model
Fluctuated within enclosing；When there is performance issue in video server or IP network, MDI:DF value often substantially becomes big, therefore IPTV
Test equipment can be according to MDI:DF value effectively evaluates CBR video flow qualities (i.e. code check stability), and to abnormal code check
Fluctuation situation is alerted.
Because VBR encoding characteristics determine that its code stream bit rate inherently has very great fluctuation process, therefore continue to continue to use MDI:
DF standards are clearly inappropriate come the code stream quality for evaluating VBR videos, can so produce substantial amounts of MDI:DF value is exceeded to be caused
Mistake alarm.But when IP video frequency programs are transmitted with VBR code streams, because set top box buffer size is limited, if video takes
There is problem or IP network delay variation is excessive in the code stream output timing of business device, still result in set top box buffer overflow or under
The problem of overflowing, causes picture mosaic or Caton phenomenon, therefore industry is regarded to evaluate VBR in the urgent need to a kind of new method of testing
The quality of frequency stream, and its video quality problems is alerted.
There is the system clock (STC) that a frequency is 27MHz in the cataloged procedure of MPEG2-TS code streams, in encoder,
This clock is used for producing the timestamp of the correct display and the decoding that indicate audio frequency and video.A quilt is contained in MPEG2-TS code streams
The referred to as field of Program Clock Reference label (PCR), the field is used to refer to the instantaneous value of system clock in itself, and it is placed in TS
By the periodically transmission (every 40ms) in the adaptive area in packet header.The correct decoding time can be not only obtained by PCR value, may be used also
For calculating the information relevant with the time such as TS stream rates.
The MPEG2-TS code streams encoded for CBR, because the speed of code stream is constant, therefore can be according to the code stream of reception
Byte number divided by nominal stream rate estimate that video can play duration.But for the video flowing that VBR is encoded, due to stream rate
It is continuous in change, therefore above computational methods are just no longer applicable.
In view of this, MPEG2-TS VBR code stream quality problems nowadays are detected in the urgent need to designing a kind of new method,
To overcome the drawbacks described above of existing method.
The content of the invention
The technical problems to be solved by the invention are：A kind of side of detection MPEG2-TS VBR code stream quality problems is provided
Method, can effectively detect that the quality problems such as distortion or interim card occurs in video.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of method of detection MPEG2-TS VBR code stream quality problems, methods described comprises the following steps：
Step S1, exported in video server by collecting device, network intermediate point or video terminal be to based on variable ratio
The MPEG2-TS code streams of special rate VBR codings carry out packet capture；Playable duration BT in video terminal buffer is initial
Change, BT=0；By video cardton duration FT initialization, FT=0；1 will be set to by buffer flag Flag first；Go to step S2；
Step S2, to MPEG2-TS code streams carry out protocol analysis, detect to include Program Clock Reference PCR MPEG2-TS
Packet, hereinafter referred to as PCR TS bags, calculate the time difference Ta of two adjacent PCR TS bags, and calculate the two adjacent PCR values
Time difference Tb；
Assuming that the packet capture time tag of n-th of TS bag is Timestamp (n), its PCR value is PCR (n), then Ta
=Timestamp (n+1)-Timestamp (n), Tb=PCR (n+1)-PCR (n), Ta and Tb is in units of millisecond；Go to step
Rapid S3；
If step S3, first buffer flag Flag=1, the playable video duration in computing terminal buffering area：BT=
BT+Tb；Go to step S4；If buffer flag Flag=0 first, the playable video duration in computing terminal buffering area：BT=
BT+Tb–Ta；Go to step S5；
Whether step S4, inspection BT reach the duration B1 of buffering first of terminal, if BT<B1, then jump to step S2；Otherwise
Flag is set to 0, represents that terminal has terminated buffer stage first, video can be commenced play out, that is, consume buffer contents, and jump
Go to step S2；
Step S5, judge BT whether be less than 0, if BT<0, then system prompt " video is likely to occur interim card ", during video cardton
Long FT=FT+ absolute values BT, and BT is reset to 0, then branch to step S7；Otherwise step S6 is gone to；
Step S6, judge BT whether be more than B2, if BT>B2, wherein B2 are that terminal buffer is open ended maximum playable
Video duration, then system prompt " buffer overflow is alerted, in fact it could happen that distortion ", sets BT=B2；Go to step S7；
Whether step S7, inspection video flowing terminate, if not terminating, jump to step S2, otherwise terminate algorithm.
A kind of method of detection MPEG2-TS VBR code stream quality problems, by the PCR fields for monitoring MPEG2-TS code streams
To calculate the playable duration of the VBR video flowings received, and pseudo-terminal screen buffer increases and consumption process, Ran Hougen
Detect that the quality problems of distortion or interim card occurs in video according to buffer overflow or underflow event.
As one embodiment of the present invention, methods described comprises the following steps：
Step S1, exported in video server by collecting device, network intermediate point or video terminal be to based on variable ratio
The MPEG2-TS code streams of special rate VBR codings carry out packet capture；Playable duration BT in video terminal buffer is initial
Change；By video cardton duration FT initialization；A will be set to by buffer flag Flag first；Go to step S2；
Step S2, to MPEG2-TS code streams carry out protocol analysis, detect to include Program Clock Reference PCR MPEG2-TS
Packet, hereinafter referred to as PCR TS bags, calculate the time difference Ta of two adjacent PCR TS bags, and calculate the two adjacent PCR values
Time difference Tb；Go to step S3；
If step S3, first buffer flag Flag=a, the playable video duration in computing terminal buffering area：BT=
BT+Tb；Go to step S4；
If buffer flag Flag=0 first, the playable video duration in computing terminal buffering area：BT=BT+Tb-Ta；
Go to step S5；
Whether step S4, inspection BT reach the duration B1 of buffering first of terminal, if BT<B1, then jump to step S2；
Otherwise Flag is set to b, represents that terminal has terminated buffer stage first, video can be commenced play out, that is, consume slow
Area's content is rushed, and jumps to step S2；
Step S5, judge BT whether be less than 0, if BT<0, then system do interim card prompting, video cardton duration FT=FT+ is exhausted
0 is reset to value BT, and by BT, step S7 is then branched to；Otherwise step S6 is gone to；
Step S6, judge BT whether be more than B2, if BT>B2, wherein B2 are that terminal buffer is open ended maximum playable
Video duration, then system do alarm prompt, BT=B2 is set；Go to step S7；
Whether step S7, inspection video flowing terminate, if not terminating, jump to step S2, otherwise terminate algorithm.
As one embodiment of the present invention, in step S2, it is assumed that the packet capture time tag of n-th of TS bag is
Timestamp (n), its PCR value be PCR (n), then Ta=Timestamp (n+1)-Timestamp (n), Tb=PCR (n+1)-
PCR(n)。
As one embodiment of the present invention, the playable duration BT in video terminal buffer is initialized, BT=
0；By video cardton duration FT initialization, FT=0.
The beneficial effects of the present invention are：The method of detection MPEG2-TS VBR code stream quality problems proposed by the present invention is led to
The PCR fields of monitoring MPEG2-TS code streams are crossed to calculate the playable duration of the VBR video flowings received, and pseudo-terminal video
Buffering area increases and consumption process, then detects that distortion or interim card occurs in video according to buffer overflow or underflow event
Etc. quality problems.
Because PCR fields are, when encoder generates TS code streams, to be inserted with audio-video frequency content by real-time synchronization, its base
Originally the sequential relationship of audio-video frequency content is reflected, therefore just can be by calculating the starting PCR of one section of TS code stream and terminating PCR's
Difference obtains the playable duration of this section of TS code stream.
Brief description of the drawings
Fig. 1 is the flow chart of detection method.
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment one
Referring to Fig. 1, present invention is disclosed a kind of method of detection MPEG2-TS VBR code stream quality problems, passing through monitoring
The PCR fields of MPEG2-TS code streams calculate the playable duration of the VBR video flowings received, and pseudo-terminal screen buffer
Increase and consumption process, then detect that the quality such as distortion or interim card occurs in video according to buffer overflow or underflow event
Problem.The detection method comprises the following steps：
【Step S1】By collecting device in video server outlet, network intermediate point or video terminal to based on variable ratio
The MPEG2-TS code streams of special rate VBR codings carry out packet capture；Playable duration BT in video terminal buffer is initial
Change, BT=0；By video cardton duration FT initialization, FT=0；1 will be set to by buffer flag Flag first；
【Step S2】Protocol analysis is carried out to MPEG2-TS code streams, detects to include Program Clock Reference PCR MPEG2-
TS packets, hereinafter referred to as PCR TS bags, calculate the time difference Ta of two adjacent PCR TS bags, and calculate the two adjacent PCR
The time difference Tb of value；
Assuming that the packet capture time tag of n-th of TS bag is Timestamp (n), its PCR value is PCR (n), then Ta
=Timestamp (n+1)-Timestamp (n), Tb=PCR (n+1)-PCR (n), Ta and Tb is in units of millisecond；
【Step S3】If buffer flag Flag=1 first, the playable video duration in computing terminal buffering area：BT=
BT+Tb；Go to step S4；If buffer flag Flag=0 first, the playable video duration in computing terminal buffering area：BT=
BT+Tb–Ta；Go to step S5；
【Step S4】Check whether BT reaches the duration B1 of buffering first of terminal, if BT<B1, then jump to step S2；It is no
Flag is then set to 0, represents that terminal has terminated buffer stage first, video can be commenced play out, that is, consume buffer contents, and
Jump to step S2；
【Step S5】Judge whether BT is less than 0, if BT<0, then system prompt " video is likely to occur interim card ", video cardton
Duration FT=FT+ absolute value BT, and BT is reset to 0, then branch to step S7；Otherwise step S6 is gone to；
【Step S6】Judge whether BT is more than B2, if BT>B2, wherein B2 are that terminal buffer is open ended maximum playable
Video duration, then system prompt " buffer overflow is alerted, in fact it could happen that distortion ", sets BT=B2；Go to step S7；
【Step S7】Check whether video flowing terminates, if not terminating, jump to step S2, otherwise terminate algorithm.
In summary, the method for detection MPEG2-TS VBR code stream quality problems proposed by the present invention, passes through monitoring
The PCR fields of MPEG2-TS code streams calculate the playable duration of the VBR video flowings received, and pseudo-terminal screen buffer
Increase and consumption process, then detect that the quality such as distortion or interim card occurs in video according to buffer overflow or underflow event
Problem.
Here description of the invention and application be illustrative, be not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, real for those skilled in the art
The replacement and equivalent various parts for applying example are known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case of, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and part are realized.In the case where not departing from scope and spirit of the present invention, embodiments disclosed herein can be entered
The other deformations of row and change.
Claims (4)
1. a kind of method of detection MPEG2-TS VBR code stream quality problems, it is characterised in that methods described comprises the following steps：
Step S1, exported in video server by collecting device, network intermediate point or video terminal be to based on variable bit rate
The MPEG2-TS code streams of VBR codings carry out packet capture；By the playable duration BT initialization in video terminal buffer, BT
=0；By video cardton duration FT initialization, FT=0；1 will be set to by buffer flag Flag first；Go to step S2；
Step S2, to MPEG2-TS code streams carry out protocol analysis, detect to include Program Clock Reference PCR MPEG2-TS data
Bag, hereinafter referred to as PCR TS bags, the time difference Ta of two adjacent PCR TS bags of calculating, and calculate the two adjacent PCR values when
Between difference Tb；
Assuming that the packet capture time tag of n-th of TS bag is Timestamp (n), its PCR value is PCR (n), then Ta=
Timestamp (n+1)-Timestamp (n), Tb=PCR (n+1)-PCR (n), Ta and Tb is in units of millisecond；Go to step
S3；
If step S3, first buffer flag Flag=1, the playable video duration in computing terminal buffering area：BT=BT+
Tb；Go to step S4；If buffer flag Flag=0 first, the playable video duration in computing terminal buffering area：BT=BT+
Tb–Ta；Go to step S5；
Whether step S4, inspection BT reach the duration B1 of buffering first of terminal, if BT<B1, then jump to step S2；Otherwise will
Flag is set to 0, represents that terminal has terminated buffer stage first, can commence play out video, that is, consume buffer contents, and redirect
To step S2；
Step S5, judge BT whether be less than 0, if BT<0, then system prompt " video is likely to occur interim card ", video cardton duration FT
=FT+ absolute value BT, and BT is reset to 0, then branch to step S7；Otherwise step S6 is gone to；
Step S6, judge BT whether be more than B2, if BT>B2, wherein B2 are the open ended maximum playable video of terminal buffer
Duration, then system prompt " buffer overflow is alerted, in fact it could happen that distortion ", sets BT=B2；Go to step S7；
Whether step S7, inspection video flowing terminate, if not terminating, jump to step S2, otherwise terminate algorithm.
2. a kind of method of detection MPEG2-TS VBR code stream quality problems, it is characterised in that：
The playable duration of the VBR video flowings received is calculated by monitoring the PCR fields of MPEG2-TS code streams, and simulates end
Hold screen buffer to increase and consumption process, then detect that distortion occurs in video according to buffer overflow or underflow event
Or the quality problems of interim card；
Methods described comprises the following steps：
Step S1, exported in video server by collecting device, network intermediate point or video terminal be to based on variable bit rate
The MPEG2-TS code streams of VBR codings carry out packet capture；By the playable duration BT initialization in video terminal buffer；Will
Video cardton duration FT is initialized；1 will be set to by buffer flag Flag first；Go to step S2；
Step S2, to MPEG2-TS code streams carry out protocol analysis, detect to include Program Clock Reference PCR MPEG2-TS data
Bag, hereinafter referred to as PCR TS bags, the time difference Ta of two adjacent PCR TS bags of calculating, and calculate the two adjacent PCR values when
Between difference Tb；Go to step S3；
If step S3, first buffer flag Flag=1, the playable video duration in computing terminal buffering area：BT=BT+
Tb；Go to step S4；
If buffer flag Flag=0 first, the playable video duration in computing terminal buffering area：BT=BT+Tb-Ta；Go to
Step S5；
Whether step S4, inspection BT reach the duration B1 of buffering first of terminal, if BT<B1, then jump to step S2；
Otherwise Flag is set to 0, represents that terminal has terminated buffer stage first, video can be commenced play out, that is, consume buffering area
Content, and jump to step S2；
Step S5, judge BT whether be less than 0, if BT<0, then system do interim card prompting, video cardton duration FT=FT+ absolute values
BT, and BT is reset to 0, then branch to step S7；Otherwise step S6 is gone to；
Step S6, judge BT whether be more than B2, if BT>B2, wherein B2 are the open ended maximum playable video of terminal buffer
Duration, then system do alarm prompt, BT=B2 is set；Go to step S7；
Whether step S7, inspection video flowing terminate, if not terminating, jump to step S2, otherwise terminate algorithm.
3. the method for detection MPEG2-TS VBR code stream quality problems according to claim 2, it is characterised in that：
In step S2, it is assumed that the packet capture time tag of n-th of TS bag is Timestamp (n), its PCR value is PCR (n),
Then Ta=Timestamp (n+1)-Timestamp (n), Tb=PCR (n+1)-PCR (n).
4. the method for detection MPEG2-TS VBR code stream quality problems according to claim 2, it is characterised in that：
By the playable duration BT initialization in video terminal buffer, BT=0；By video cardton duration FT initialization, FT=
0。
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| CN106303503A (en) * | 2015-05-25 | 2017-01-04 | 德科仕通信(上海)有限公司 | A kind of method judging MPEG2-TS VBR code stream quality |
| CN105898323A (en) * | 2015-12-04 | 2016-08-24 | 乐视致新电子科技（天津）有限公司 | Method used for adding watermark in video and determining watermark information and device |
| CN109327724B (en) * | 2017-08-01 | 2021-08-31 | 成都鼎桥通信技术有限公司 | Audio and video synchronous playing method and device |
| CN109561347B (en) * | 2017-09-27 | 2022-01-25 | 中国移动通信集团山东有限公司 | Internet video playing quality judgment method and system |
| CN110662017B (en) * | 2018-06-30 | 2022-05-10 | 华为技术有限公司 | Video playing quality detection method and device |
| CN111083465B (en) * | 2018-10-22 | 2021-08-31 | 中国电信股份有限公司 | Video stuck analysis method, device and system, user terminal and storage medium |
| CN111131808B (en) * | 2018-10-30 | 2021-08-31 | 中国电信股份有限公司 | Video stuck fault analysis method and device and set top box |
| CN111327964B (en) * | 2018-12-17 | 2022-11-25 | 中国移动通信集团北京有限公司 | Method and device for positioning video playing pause |
| CN112261445B (en) * | 2020-10-21 | 2022-07-12 | 深圳市创维软件有限公司 | Streaming media playing method, device, equipment and computer readable storage medium |
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