CN105763942B - A kind of computational methods of IPTV set top box VMOS values - Google Patents
A kind of computational methods of IPTV set top box VMOS values Download PDFInfo
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- CN105763942B CN105763942B CN201610257260.6A CN201610257260A CN105763942B CN 105763942 B CN105763942 B CN 105763942B CN 201610257260 A CN201610257260 A CN 201610257260A CN 105763942 B CN105763942 B CN 105763942B
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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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
-
- 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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/4508—Management of client data or end-user data
-
- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
- H04N21/6437—Real-time Transport Protocol [RTP]
Abstract
A kind of computational methods of IPTV set top box VMOS values, are related to IPTV set top box technical field, including step：The playback terminal of IPTV set top box receives the RTP bags from streaming media server in playing process, and RTP bags include TS bags, in a calculating cycle, records the TS bag numbers actually received, and calculate the TS bag numbers that receive；Calculate the packet loss of a calculating cycle；And in a calculating cycle all RTP bags network jitter；The playback terminal calculates factor of influence of the packet loss to VMOS, and calculating network shakes the factor of influence to VMOS, by formula VMOS=5 f (drop) g (jitter), obtains VMOS values.The present invention reduces the amount of calculation of VMOS values, current VMOS values is quickly calculated, suitable for existing network environment.
Description
Technical field
The present invention relates to IPTV set top box technical field, is specifically a kind of IPTV set top box VMOS (Mean
Opinion Score for Video, video quality mean subjective opinion point) value computational methods.
Background technology
IPTV (IPTV) is used as a kind of interactive video service bearing mode, changes traditional TV and sees
Mode is seen, is terminal by transmission channel, set top box of network, is provided a user including a variety of interactive modes such as program request, live, time shift
Video frequency program and value-added service.In IPTV service implementation, operator can according to locality network structure and userbase, if
Determine user and use different access ways, a service channel end to end is established between platform and user, is regarded to carry
Frequency business.By the authentication in business platform and certification, IPTV set top box interacts with video server, using multicast mode or list
Broadcast mode obtains video flowing.In general, in order to save the IP bandwidth of Metropolitan Area Network (MAN), live broadcast service uses multicast mode for operator,
Joining and departing from for channel is all by IGMP (Internet Group Management Protocol, internet group of management association
View) agreement completion.Time-shift service and demand (telecommunication) service then use mode of unicast, and control protocol passes through RTSP (Real Time
Streaming Protocol, real time streaming transport protocol) protocol realization.
Due to the interactivity of IPTV service pattern, Consumer's Experience is particularly important, and video quality is to weigh Consumer's Experience most
One of important criteria.G.1070 agreement is a kind of is directed to the relatively effective quality assessment side of video for International Telecommunication Union (ITU)
Method, provide VMOS values.The angle perceived from user carrys out subjective assessment video quality, the span for defining VMOS values be 1-5 it
Between, 1 point is worst, and 5 points are best.The agreement by consider comprehensively influence video quality the various factors, including the frame per second of video and
Code check, network packet loss rate and shake etc., there is provided the full reference model of a calculating VMOS value.But the full reference model compared with
For complexity, the parameter being related to is a lot, wherein many reference factor very littles, amount of calculation is very big, is generally used for laboratory environment, uncomfortable
For existing network environment.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of meter of IPTV set top box VMOS values
Calculation method, the amount of calculation of VMOS values is reduced, current VMOS values are quickly calculated, suitable for existing network environment.
To achieve the above objectives, the present invention takes a kind of computational methods of IPTV set top box VMOS values, including step：
The playback terminal of S1.IPTV set top boxes receives the RTP bags from streaming media server in playing process, and RTP bags include TS
Bag, in a calculating cycle, the TS bag numbers actually received are recorded, and calculate the TS bag numbers that receive；S2. according to institute
The TS bags number actually received and the TS bag numbers that should be received are stated, calculates the packet loss of a calculating cycle；S3. count
Calculate the network jitter of all RTP bags in a calculating cycle；S4. the playback terminal passes through f (drop)=a* (1-1/e^ mono-
The packet loss of calculating cycle), packet loss is calculated to VMOS factor of influence f (drop), and wherein e is natural logrithm bottom, a value
Scope is 2.85<a<3.05；S5. playback terminal passes through g (jitter)=b* | the network of all RTP bags in a calculating cycle
Shake |, calculating network shakes the factor of influence g (jitter) to VMOS, and wherein b span is 0.03<b<0.05；S6.
By formula VMOS=5-f (drop)-g (jitter), VMOS values are obtained.
On the basis of above-mentioned technical proposal, in S1, all TS bags for reaching playback terminal are parsed, record top line
Clock reference value, originated its corresponding TS bag as counting；Last program clock reference value is recorded, by its corresponding TS
Bag terminates as counting；The TS bag count values obtained are terminated to counting from counting starting, the interior broadcasting of an as calculating cycle is eventually
The total num of TS bags received is held, passes through formula bitrate=num*188* system clock frequencys/(last program clock ginseng
Examine value-top line clock reference value), wherein bitrate is current video stream bit rate, should be received in a calculating cycle
The TS bag number expTSNum=bitrate* calculating cycles arrived.
On the basis of above-mentioned technical proposal, packet loss=(TS bag numbers that should be received in a calculating cycle
Mesh-TS bags the number actually received)/calculating cycle.
On the basis of above-mentioned technical proposal, in S3, the network jitter of all RTP bags in a calculating cycle, it is
In one calculating cycle, in addition to first RTP bag, network jitter between each RTP bag and previous RTP bags it is total
With.
On the basis of above-mentioned technical proposal, in addition to first RTP bag, the playback terminal records each RTP bag
Arrival time, parse the timestamp included in the packet header of each RTP bag, calculate each RTP bag and previous RTP bags
Reaching time-difference, and calculate the time difference of the timestamp of each RTP bag and the timestamp of previous RTP bags, the arrival
Time difference and the difference of the time difference of timestamp, it is the network jitter between the RTP bags and previous RTP bags.
On the basis of above-mentioned technical proposal, one calculating cycle is equal to 1 second.
On the basis of above-mentioned technical proposal, streaming media server is handed down to the media number of the playback terminal of IPTV set top box
Carried according to by RTP, each RTP bag is made up of RTP packet header and 1~7 TS bag, and RTP packet header is made up of 12~16byte, preceding
12byte is standard RTP heads, wherein 5~8byte represents RTP timestamps.
On the basis of above-mentioned technical proposal, the S1, the playback terminal of IPTV set top box before being played, the broadcasting
Terminal is first established with quality management platform and is connected, and obtains video quality monitoring threshold value, and then the terminal of putting takes with Streaming Media
Business device interaction, obtains media data flow.
On the basis of above-mentioned technical proposal, after playback terminal described in S6 obtains VMOS values, quality management platform is reported,
If VMOS values give quality management platform less than video quality monitoring threshold value, report and alarm.
On the basis of above-mentioned technical proposal, the video quality monitoring threshold value is 3.6.
The beneficial effects of the present invention are：In the playing process of the playback terminal of IPTV set top box, a calculating is calculated
The network jitter of all RTP bags in packet loss in cycle, and a calculating cycle, by weighting, calculate packet loss pair
VMOS factor of influence f (drop), and network jitter is to VMOS factor of influence g (jitter), then pass through VMOS=5-f
(drop)-g (jitter), VMOS values are obtained.Whole process reference data is less, and amount of calculation is reduced, and quickly can reasonably be counted
Current VMOS values are calculated, quality management platform is obtained effective reference data in time, facilitate adjustable strategies, Consumer's Experience is improved and is applicable
In existing network environment.
Brief description of the drawings
Fig. 1 is the computational methods flow chart of IPTV set top box VMOS values of the embodiment of the present invention；
Fig. 2 is the flow chart that the embodiment of the present invention calculates packet loss in a calculating cycle；
Fig. 3 is the flow chart that the embodiment of the present invention calculates the network jitter of all RTP bags in a calculating cycle.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in figure 1, the computational methods of IPTV set top box VMOS values of the present invention, specifically comprise the following steps：
The playback terminal of S1.IPTV set top boxes receives the RTP bags from streaming media server in playing process, each
Individual RTP bags are made up of RTP packet header and 1~7 TS bag.In a calculating cycle, record and actually received from streaming media server
TS (Transport Stream, transport stream) bag number, i.e. received in TS bag number=mono- calculating cycles data length
Spend/188 bytes (TS packet lengths).
IPTV set top box playback terminal before broadcasting, the playback terminal can be as needed, is put down with quality management
Platform first establishes connection, obtains video quality monitoring threshold value (the present embodiment 3.6), and then the playback terminal takes with Streaming Media
Business device interaction, obtains media data flow.
S2. the TS bags number and the TS bag numbers that should be received actually received according to, a calculating is calculated
Packet loss in cycle；
S3. in a calculating cycle, the network jitter of all RTP bags is calculated.
The playback terminal of S4.IPTV set top boxes is in a calculating cycle, by being weighted to packet loss, calculates packet loss pair
VMOS factor of influence f (drop).The non-linear effects watched in view of packet loss user, f (drop)=a* (1-1/e^ mono-
The packet loss of calculating cycle), wherein e is natural logrithm bottom, and a values are existing network commissioning experience value, 2.85 during scope<a<3.05.
The playback terminal of S5.IPTV set top boxes is in a calculating cycle, and by being weighted to network jitter, calculating network is trembled
Dynamic factor of influence g (jitter), g (jitter)=b* to VMOS | the network jitter of all RTP bags in a calculating cycle |,
Wherein b span is 0.03<b<0.05.
S6. by formula VMOS=5-f (drop)-g (jitter), VMOS values are obtained.The playback terminal obtains VMOS
After value, quality management platform can be reported, if VMOS values, less than video quality monitoring threshold value, report and alarm is to matter
Buret platform.
In step S5, the VMOS values that finally give are as shown in table 1 with the contrast relationship of user's subjective feeling.
Table 1
As shown in Fig. 2 comprise the following steps specifically, calculating packet loss in a calculating cycle：
S201. in a calculating cycle, the TS bag numbers that the playback terminal of IPTV set top box actually receives are recorded
rcvTSNum.The TS bags of all arrival playback terminals are parsed, record PCR (the Program Clock of first arrival
Reference, program clock reference) value pcrStart, originated its corresponding TS bag as counting.
S202. the PCR value pcrEnd that terminal is put in last arrival is recorded, is terminated its corresponding TS bag as counting.
S203. the TS bag count values obtained, playback terminal as in a calculating cycle are terminated to counting from counting starting
The total num of TS bags received.
S204. the PCR differences of terminal are put by reaching, and TS media data packets count, and calculate current video stream bit rate
Bitrate, formula are：Bitrate=num*188* system clock frequencys/(- the first PCR value of last PCR value), because
The TS bag number expTSNum=bitrate* calculating cycles that should be received in this calculating cycle.
S205. according to the TS bag number rcvTSNum actually received, and the TS bag number expTSNum that should be received, meter
Calculate the packet loss of a calculating cycle, packet loss=(expTSNum-rcvTSNum)/calculating cycle.
One calculating cycle is usually 1 second, but in actual mechanical process, for the ease of calculating, is used in 1 second
The time that first TS bag with PCR reaches, and the time difference that last TS bag with PCR reaches.So the present embodiment
In, a calculating cycle is 1 second.
As shown in figure 3, in a calculating cycle, the flow for calculating the network jitter of all RTP bags is as follows：
S301. in a calculating cycle, the playback terminal of IPTV set top box, arrival time of each RTP bag is recorded
ArriveT (i)=time (NULL), i >=1.
S302. the timestamp timeStampT (i) included in the packet header of each RTP bag is parsed.Specifically, Streaming Media takes
The media data for the playback terminal that business device is handed down to IPTV set top box is carried by RTP, and each RTP bag is by RTP packet header and 1~7
Individual TS bags composition, RTP packet header are made up of 12~16byte, and preceding 12byte is standard RTP heads (referring to RFC1889 definition), its
In 5~8byte represent RTP timestamps.
S303. in addition to first RTP bag, the reaching time-difference of each RTP bag and previous RTP bags is calculated, i.e.,
DiffArriveT (i)=arriveT (i)-arriveT (i-1), outside the situation for removing i=1, i ＞ 1.
S304. in addition to first RTP bag, the timestamp of each RTP bag and the timestamp of previous RTP bags are calculated
Time difference, i.e.,
DiffTimeStampT (i)=timeStampT (i)-timeStampT (i-1).
S305. the difference of the time difference of the reaching time-difference and timestamp, as current RTP bag and previous RTP bags
Between network jitter, i.e., current network shake Jitter (i)=diffTimeStamp (i)-diffArriveT (i), network
May be negative in order, poor network condition may be just.
S306. in a calculating cycle, the network jitter of all RTP bags, i.e. in addition to first RTP bag, each
The summation of network jitter between RTP bags and previous RTP bags, calculation：Jitter=Jitter (1)+Jitter (2)
+...+Jitter(n)。
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (10)
1. a kind of computational methods of IPTV set top box VMOS values, it is characterised in that including step：
The playback terminal of S1.IPTV set top boxes receives the RTP bags from streaming media server in playing process, and RTP bags include
TS bags, in a calculating cycle, the TS bag numbers actually received are recorded, and calculate the TS bag numbers that receive；
S2. the TS bags number and the TS bag numbers that should be received actually received according to, calculates a calculating cycle
Packet loss；
S3. the network jitter of all RTP bags in a calculating cycle is calculated；
S4. the playback terminal calculates packet loss pair by f (drop)=a* (packet loss of mono- calculating cycle of 1-1/e^)
VMOS factor of influence f (drop), wherein e are natural logrithm bottom, and a span is 2.85<a<3.05；
S5. playback terminal passes through g (jitter)=b* | the network jitter of all RTP bags in a calculating cycle |, calculating network
The factor of influence g (jitter) to VMOS is shaken, wherein b span is 0.03<b<0.05；
S6. by formula VMOS=5-f (drop)-g (jitter), VMOS values are obtained.
2. the computational methods of IPTV set top box VMOS values as claimed in claim 1, it is characterised in that：In S1, parsing is all to arrive
Up to the TS bags of playback terminal, top line clock reference value is recorded, is originated its corresponding TS bag as counting；Record is last
One program clock reference value, terminated its corresponding TS bag as counting；The TS bags obtained are terminated to counting from counting starting
Count value, the total num of TS bags that playback terminal receives as in a calculating cycle, passes through formula bitrate=num*188*
System clock frequency/(last program clock reference value-top line clock reference value), wherein bitrate is current
Video stream bit rate, the TS bag number expTSNum=bitrate* calculating cycles that should be received in a calculating cycle.
3. the computational methods of IPTV set top box VMOS values as claimed in claim 1, it is characterised in that：In one calculating cycle
Packet loss=(the TS bags number-TS bags number actually received that should be received)/calculating cycle.
4. the computational methods of IPTV set top box VMOS values as claimed in claim 1, it is characterised in that：In S3, in a calculating
The network jitter of all RTP bags in cycle, as in a calculating cycle, in addition to first RTP bag, each RTP bag with
The summation of network jitter between previous RTP bags.
5. the computational methods of IPTV set top box VMOS values as claimed in claim 4, it is characterised in that：Except first RTP bag it
Outside, the playback terminal records the arrival time of each RTP bag, parses the timestamp included in the packet header of each RTP bag,
Calculate the reaching time-difference of each RTP bag and previous RTP bags, and calculate the timestamp of each RTP bag with it is previous
The difference of the time difference of the time difference of the timestamp of RTP bags, the reaching time-difference and timestamp, be the RTP bags with it is previous
Network jitter between individual RTP bags.
6. the computational methods of the IPTV set top box VMOS values as described in claim 1-5 is any, it is characterised in that：One meter
The cycle is calculated equal to 1 second.
7. the computational methods of the IPTV set top box VMOS values as described in claim 1 or 5, it is characterised in that：Streaming media server
The media data for being handed down to the playback terminal of IPTV set top box is carried by RTP, and each RTP bag is by RTP packet header and 1~7 TS
Bag composition, RTP packet header are made up of 12~16byte, and preceding 12byte is standard RTP heads, wherein 5~8byte represents the RTP times
Stamp.
8. the computational methods of IPTV set top box VMOS values as claimed in claim 1, it is characterised in that：The S1, IPTV machine top
The playback terminal of box before being played, with quality management platform first establish and be connected by the playback terminal, obtains video quality monitoring
Threshold value, then the playback terminal interacted with streaming media server, obtain media data flow.
9. the computational methods of IPTV set top box VMOS values as claimed in claim 8, it is characterised in that：Playback terminal described in S6
After obtaining VMOS values, quality management platform is reported, if VMOS values are less than video quality monitoring threshold value, report and alarm
Give quality management platform.
10. the computational methods of IPTV set top box VMOS values as claimed in claim 8 or 9, it is characterised in that：The video quality
It is 3.6 to monitor threshold value.
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| CN108668123A (en) * | 2017-03-31 | 2018-10-16 | 华为技术有限公司 | A kind of acquisition methods and network element device of video tastes evaluation result |
| CN109889398B (en) * | 2017-12-06 | 2020-12-04 | 中国移动通信有限公司研究院 | Method, device, equipment and storage medium for detecting quality of media stream service |
| CN108390794B (en) * | 2018-02-05 | 2020-07-07 | 烽火通信科技股份有限公司 | Method and system for calculating packet loss rate of streaming media data |
| CN109005403B (en) * | 2018-07-06 | 2019-11-12 | 烽火通信科技股份有限公司 | The monitoring method and system of MPEG video transmission quality |
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