CN101296166A - Method for measuring multimedia data based on index - Google Patents
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- CN101296166A CN101296166A CNA2007100977929A CN200710097792A CN101296166A CN 101296166 A CN101296166 A CN 101296166A CN A2007100977929 A CNA2007100977929 A CN A2007100977929A CN 200710097792 A CN200710097792 A CN 200710097792A CN 101296166 A CN101296166 A CN 101296166A
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Abstract
The invention discloses a measuring method of multimedia data based on indexes, which comprises the following steps of: constructing multimedia data packets, establishing packet sequence number of the multimedia data packets and corresponding indexes among multimedia data; distinguishing an error area and a non-error area of a frame where an error exists according to packet loss number sent back by a receiving terminal and information stored in index files; establishing error multimedia data by utilizing the error area, the non-error area and the index data stored in the index files; comparing the established error multimedia data with multimedia data decoded rightly to obtain a comparative result. The invention also discloses a method for establishing error multimedia data.
Description
Technical field
The present invention relates to transmission of a kind of multimedia messages and treatment technology, specifically, relate to a kind of method of measurement of the multi-medium data based on index.
Background technology
Along with the development of cable network and wireless network and the driving of user's request, multimedia technology has obtained increasing concern with relevant application, is considered to one of mainstream applications of following express network.Multimedia application comprises Video Applications and voice applications, uses as WWW, E-mail etc. with respect to the tradition of Internet, and is bigger to the demand of bandwidth, multi-medium data be collapsed into a very urgent task.The high compression rate coding techniques based on prediction has been adopted in multi-medium datas such as existing video and audio frequency transmission, and therefore data-bag lost in network transmission process or the delay video and the audio quality that can cause decoding end descends.But existing network does not provide the QoS (Quality of Serverices) of transmission to guarantee, so the losing or postpones unavoidably of packet, and this all can cause the user experience quality decline of receiving terminal.For operator and content supplier can monitor the multimedia service quality of receiving terminal, multimedia service quality how to monitor and estimate receiving terminal effectively becomes the research focus of field of multimedia communication.
Estimating receiving terminal multimedia service method for quality is at receiving terminal the multimedia messages of receiving to be monitored, contain wrong multimedia data information by decoding processing, and the position (as RTP Bale No.) of error message in multi-medium data fed back to server end.Rebuild according to the multi-medium data of the error feedback information butt joint receiving end that receives at server end, utilize reconstruction video and reference video to compare then, thereby the multimedia service performance of the receiving end that achieves a butt joint is monitored and estimated.
The shortcoming of this method is and need decodes to the multi-medium data bag at monitored receiving terminal, then the error message in the decode procedure is fed back to server end by feedback channel, again carry out once complete decoding at server end, just can obtain reconstruction video.Under the situation of a plurality of receiving terminals of server service, when each receiving terminal is carried out the multimedia service quality evaluation, all need to carry out once complete decoding, this just need carry out repeatedly complete video and audio decoder handles, and this performance to server has proposed very high requirement.
Summary of the invention
Technical problem solved by the invention provides a kind of method of measurement of the multi-medium data based on index, the process of reconstruction of the multi-medium data when having simplified the multimedia service quality evaluation helps at server end a plurality of receiving terminals being carried out monitoring multimedia service performance.
A kind of method of measurement of the multi-medium data based on index comprises:
(1) makes up the multi-medium data bag, the index between the bag sequence number of setting up described multi-medium data bag and the corresponding multi-medium data;
(2) return the mistake zone and the non-mistake zone of the data separation mistake place frame of preserving in the packet loss information of coming and the index file according to receiving terminal; The described Bale No. of losing obtains by the receiving terminal decoding;
(3) utilize described mistake zone and the non-mistake zone of finding out, and the index data of preserving in the described index file makes up the mistake multi-medium data;
(4) utilize mistake multi-medium data that makes up and the multi-medium data that is correctly decoded to compare, draw comparative result.
Further, in the step (1), when packing sends multimedia code stream, carry out normal decode operation, set up index, and write index data, comprise data length, segment information, macro block, block message or the residual information of sequence number, index entry in the indexed file structure of foundation to index file.
Further, in the step (2), search multi-medium data residing zone in error frame that this bag comprises in the bag sequence number indexed file according to packet loss.
Further, in the step (2), in the multi-medium data transmission course, set up sampled point, described sampled point is judged the sequence number of the multi-medium data bag of reception, the sequence number of wrong multi-medium data bag is sent to monitor server by feedback channel, obtains carrying out the multimedia messages lost in the decode procedure at receiving terminal according to call number.
The method of measurement of the multi-medium data based on index according to claim 7, it is characterized in that, in the step (3), feed back the packet loss information and the index file of coming according to sampled point, obtain receiving terminal drop-out residing position in multi-medium data, make up the mistake multi-medium data.
Further, in the step (3), return the next multi-medium data of losing Bale No., index file and being correctly decoded, make up the multi-medium data that has mistake of receiving terminal in the monitor server simulation according to sampled point; Have in the process of multi-medium data of mistake at structure, only partial decoding of h carried out in the zone that influenced by mistake, be not subjected to zone that mistake influences directly from the multi-medium data that has been correctly decoded copy comes to fill; Described partial decoding of h is to utilize the information of preserving in the index file to carry out the reconstruction of multi-medium data, and readout code stream does not carry out complete decode operation from ASCII stream file ASCII.
Further, in the step (4),, to the mistake multi-medium data rebuild be correctly decoded multi-medium data and calculate the video quality measurement value, utilize described video quality measurement value to compare with effective peak signal to noise ratio method.
Another technical problem solved by the invention provides a kind of method that makes up the mistake multi-medium data, can utilize index file and packet loss information architecture mistake multimedia file.
Technical scheme is as follows:
A kind of method that makes up the mistake multi-medium data comprises:
(1) makes up the multi-medium data bag, the index between the bag sequence number of setting up described multi-medium data bag and the corresponding multi-medium data;
(2) return the mistake zone and the non-mistake zone of the data separation mistake place frame of preserving in the packet loss information of coming and the index file according to receiving terminal; The described Bale No. of losing obtains by receiving terminal decoding or sampled point, and sends to monitor server by feedback channel;
(3) utilize described mistake zone and the non-mistake zone of finding out, and the index data of preserving in the described index file makes up the mistake multi-medium data.
Further, in the step (1), when sending multimedia code stream, carry out normal decode operation, set up index, and write index data, comprise data length, segment information, macro block, block message or the residual information of sequence number, index entry in the indexed file structure of foundation to index file.
Further, in the step (3), return the next multi-medium data of losing Bale No., index file and being correctly decoded, make up the multi-medium data that has mistake of receiving terminal in the monitor server simulation according to sampled point; Have in the process of multi-medium data of mistake at structure, only partial decoding of h carried out in the zone that influenced by mistake, be not subjected to zone that mistake influences directly from the multi-medium data that has been correctly decoded copy comes to fill; Described partial decoding of h is to utilize the information of preserving in the index file to carry out the reconstruction of multi-medium data, and readout code stream does not carry out complete decode operation from ASCII stream file ASCII.
In the process of rebuilding the mistake video, only partial decoding of h being carried out in the zone that influenced by mistake operates, do not need that readout code stream carries out complete decode operation from ASCII stream file ASCII, be not subjected to area pixel value that mistake influences directly from the video that has been correctly decoded copy comes to fill.Therefore need not carry out extra multimedia decoding process at server end handles, thereby reduced the resource requirement of server end, help the multimedia service performance of a plurality of sampled points being monitored, thereby significantly reduced the resource consumption of server end at server end.
Description of drawings
Fig. 1 is based on the multimedia service quality assessment system diagram of index and feedback information;
Fig. 2 is the structural representation of index file;
Fig. 3 is the method for reconstructing flow chart of mistake video sequence.
Embodiment
The present invention is by the packet numbers of foundation transmission and the index between the multi-medium data, by the index reconstruction video, the process of reconstruction of the multi-medium data when having simplified the multimedia service quality evaluation helps at server end a plurality of receiving terminals being carried out monitoring multimedia service performance.
With reference to the accompanying drawings, the preferred embodiments of the present invention are described in detail.
With reference to shown in Figure 1, transmitting terminal is packed to multi-medium data, and sends it to receiving terminal, during to pass through the plurality of network node.Transmitting terminal will be set up the multi-medium data Bale No. of transmission and the index between the multi-medium data in carrying out packing process, promptly set up to send the index between Data Identification number and the corresponding multi-medium data.
In the transport process of multi-medium data, the multi-medium data bag may take place to postpone or lose, and causes receiving terminal can not correctly receive all multi-medium data bags.At this moment, receiving terminal is handled by multimedia decoding, finds the bag sequence number of packet loss, and it is fed back to server end.Monitor server is again according to the feedback error information that receives, search multi-medium data that this bag comprises zone in the bag sequence number indexed file according to packet loss at the error frame place, utilize multimedia decoder to estimate monitored receiving terminal multi-medium data, rebuild the mistake multi-medium data and with reference to multi-medium data (multi-medium data that is correctly decoded), with monitored multi-medium data with compare with reference to multi-medium data, realize the monitoring of multimedia service performance.
With reference to shown in Figure 2, index structure is described in detail.
In existing block-based hybrid video coding standard, index structure should comprise (being not limited to) following information:
(1) bag sequence number.
Be index key, be used to indicate the multi-medium data that is comprised in this bag.
(2) data length of index entry (optional).
Indicate the index entry data that comprise what bytes in this index entry, it can not comprise sequence number and the data length of itself, and it is mainly used in searching fast and index of bag.
(3) segment information (Segment information), Segment represents the different meanings in different audio/video encoding standards, as the macro block group (GOB, Group of Blocks) in h.263, burst in other video standard (Slice) and band.
It mainly includes, but is not limited to: comprise the starting position of the type of the sum of Segment, the number of current Segment (Index), the frame number at current Segment place, current Segment, macro block that current Segment comprised, the end position of macro block that current Segment comprised in each bag.
(4) macro block and block message.
It mainly includes, but is not limited to: the address of macro block, the type of macro block, motion vector, reference frame number.
(5) residual information.
Represent the residual error of each piece after inverse discrete cosine transformation (IDCT) conversion.
Below the method for measurement based on the multi-medium data of index is described in detail.
1, structure is set up index, and is write index file based on the multi-medium data bag of index.
Transmitting terminal carries out normal decode operation when sending multimedia code stream, transmitting terminal will be set up the multi-medium data Bale No. of transmission and the index between the multi-medium data in carrying out packing process, promptly set up to send the index between Data Identification number and the corresponding multi-medium data.Index file comprises the index data that writes, the final indexed file structure of setting up as shown in Figure 2, but the field name in also might index file and in proper order different.Sending Data Identification number is the sequence number that coding back multi-medium data sends, and in the Streaming Media transport process based on the bag host-host protocol, sending Data Identification number is bag sequence number and the needed information of some other reconstruction multi-medium data.
2, at server end, if want a certain receiving terminal is carried out the multimedia service quality when monitoring and estimating, return the mistake zone and the non-mistake zone of the data separation mistake place frame of preserving in the Bale No. of the packet loss that comes and the index file according to this receiving terminal.
3, rebuild the mistake multi-medium data.
Return Bale No., index file and the correct decoded video file of the packet loss that comes according to receiving terminal, have the multi-medium data of mistake in server end simulation receiving terminal Fast Reconstruction.In the process of rebuilding the mistake multi-medium data, only partial decoding of h to be carried out in the zone that influenced by mistake and operate, the zone that not influenced by mistake directly copies from the multi-medium data that has been correctly decoded comes to fill.So-called partial decoding of h is meant that utilizing the information of preserving in the index file to carry out multi-medium data rebuilds, and does not need that readout code stream carries out complete decode operation from ASCII stream file ASCII.Therefore need not carry out extra multimedia decoding process processing, thereby reduce the resource requirement of server end, help the multimedia service performance of a plurality of sampled points being monitored at server end at server end.
4, service quality evaluation.
Mistake multi-medium data of rebuilding and the multi-medium data that is correctly decoded are compared, obtain evaluation result.
Be example with typical performance monitoring below, further describe performance monitoring principle of the present invention and implementation method, but be not limited to this application based on the H.264 multimedia video service of video encoding standard.
In the embodiment shown in fig. 1, video data is broken into the RTP bag after the encoder encodes of transmitting terminal through meeting video encoding standard H.264, behind network node 1 and network node 2, arrive receiving terminal.Because data transport network can't guarantee service quality, the multi-medium data that receiving terminal obtains may be inconsistent with the data of transmitting terminal.Transmitting terminal between the network node 1, network node 1 between the network node 2 or network node 2 to all exist between the receiving terminal data-bag lost may.
In order to realize that to monitoring a kind of implementation method of the present invention is as follows to the media video service performance.
1, structure is set up index, and is write index file based on the multi-medium data bag of index.
Transmitting terminal carries out normal decode operation when sending multimedia code stream, set up index and write index data to index file.
RTP (RTP, Real-time Transport Protocol) is to be used for the last a kind of host-host protocol at multimedia data stream of Internet.
Sending Data Identification number is the sequence number that coding back multimedia data information sends, and in Real-time Transport Protocol, sending Data Identification number is RTP bag sequence number.The multimedia messages that is used to set up index comprises the multimedia data information of packet correspondence, and the index file after the foundation as shown in Figure 2.
2, return the information of preserving in the Bale No. of the packet loss that comes and the index file according to this receiving terminal, distinguish the mistake zone and the non-mistake zone of mistake place frame, method is to search multi-medium data that this bag comprises in the bag sequence number indexed file according to packet loss in the error frame region.
In the multimedia video data transmission course, set up several sampled points.In the example of Fig. 1, set up sampled point 1, sampled point 2 and sampled point 3 in network node 1, network node 2 and receiving terminal position respectively.In actual applications, sampled point can be in network node position arbitrarily.Each sampled point is judged the sequence number (for example RTP bag sequence number) of the video packets of data of reception, sequence number with the erroneous video packet is sent to reference point by feedback channel then, has so just known lost which video information when receiving terminal is decoded according to call number.
3, rebuild the mistake video.
Feed back the Bale No. of the packet loss of coming and the position that index file just can be known receiving terminal drop-out place in video according to sampled point, rebuild the mistake video.
With reference to shown in Figure 3, be the index of reference file, be correctly decoded the process that error message analogue difference parablepsia that file and sampled point feedback come is rebuild frequently.
Suppose two frame of video (comprise previous I frame, do not comprise a back I frame) between the I frame as a set of pictures (GOP, Group Of Picture), as shown in the figure, with 1I, 2P, 3B, 4B, 5P ..., before the next I frame as a GOP.In current GOP, find the frame (as the 3P among Fig. 2) at first packet loss place among this GOP according to the Bale No. of index file and packet loss, there is not mistake (as 1I Fig. 2 and 2B) from the I frame of this GOP to all frames before this packet loss place frame, can be from being correctly decoded the corresponding frame of video of document copying to the corresponding position of reconstruction video file.Then, frame carries out general fault processing at the packet loss place, for example the simplest method is to copy corresponding piece to bit-error locations (as the black part in the 3P frame Fig. 2) from former frame, does not have wrong position for other, then fills up from being correctly decoded the corresponding image block of document copying.At last, to the error section in the subsequent frame that is subjected to this erroneous effects (as the black part among 4B among Fig. 2 and the 5P), according to the motion vector of relevant block wherein and and reference frame predict the predicted value that obtains the respective image piece, add the value that is the block of pixels of reconstruction after the residual error, this is the method for partial decoding of h.To other part that not influenced by wrong reference frame in this frame, then copy comes to fill from the video that is correctly decoded, thus the decode procedure that has mistake of simulation receiving terminal.
4, with effective peak signal to noise ratio (EPSNR, Effective Peak Signal Noise Ratio) method, to the mistake video rebuild be correctly decoded video and calculate video quality measurement (VQM) value, with this VQM value as final evaluation result.
From top narration as can be seen, process described in the invention and traditional comparing based on complete decoding first difference parablepsia process frequently, can reduce following calculating:
1, do not need to handle chrominance information.
2, do not need to read code stream and VLC decoding.
3, do not need the prediction of motion vector.
4, do not need to do idct transform.
5, computation complexity is relevant with packet loss position and quantity, and packet loss is far away more from the I frame for the first time, and amount of calculation is low more.
In sum, the present invention need not carry out extra multimedia decoding process at server end and handle, thereby reduced the resource requirement of server end, helped the multimedia service performance of a plurality of sampled points being monitored, thereby significantly reduced the resource consumption of server end at server end.
Claims (10)
1, a kind of method of measurement of the multi-medium data based on index comprises:
(1) makes up the multi-medium data bag, the index between the bag sequence number of setting up described multi-medium data bag and the corresponding multi-medium data;
(2) return the next information of preserving in Bale No. and the index file of losing according to receiving terminal, distinguish the mistake zone and the non-mistake zone of mistake place frame; The described Bale No. of losing obtains by the receiving terminal decoding;
(3) utilize described mistake zone and the non-mistake zone of finding out, and the index data of preserving in the described index file makes up the mistake multi-medium data;
(4) utilize mistake multi-medium data that makes up and the multi-medium data that is correctly decoded to compare, draw comparative result.
2, the method for measurement of the multi-medium data based on index according to claim 1, it is characterized in that, in the step (1), when packing sends multimedia code stream, carry out normal decode operation, set up index, and write index data, comprise data length, segment information, macro block, block message or the residual information of sequence number, index entry in the indexed file structure of foundation to index file.
3, the method for measurement of the multi-medium data based on index according to claim 1 is characterized in that, in the step (2), searches multi-medium data residing zone in error frame that this bag comprises in the bag sequence number indexed file according to packet loss.
4, the method for measurement of the multi-medium data based on index according to claim 1, it is characterized in that, in the step (2), in the multi-medium data transmission course, set up sampled point, described sampled point is judged the sequence number of the multi-medium data bag of reception, the sequence number of wrong multi-medium data bag is sent to monitor server by feedback channel, obtains carrying out the multimedia messages lost in the decode procedure at receiving terminal according to call number.
5, the method for measurement of the multi-medium data based on index according to claim 1, it is characterized in that, in the step (3), feed back the packet loss information and the index file of coming according to sampled point, obtain receiving terminal drop-out residing position in multi-medium data, make up the mistake multi-medium data.
6, the method for measurement of the multi-medium data based on index according to claim 1, it is characterized in that, in the step (3), return the next multi-medium data of losing Bale No., index file and being correctly decoded according to sampled point, make up the multi-medium data that has mistake of receiving terminal in the monitor server simulation; Have in the process of multi-medium data of mistake at structure, only partial decoding of h carried out in the zone that influenced by mistake, be not subjected to zone that mistake influences directly from the multi-medium data that has been correctly decoded copy comes to fill; Described partial decoding of h is to utilize the information of preserving in the index file to carry out the reconstruction of multi-medium data, and readout code stream does not carry out complete decode operation from ASCII stream file ASCII.
7, the method for measurement of the multi-medium data based on index according to claim 1, it is characterized in that, in the step (4), with effective peak signal to noise ratio method, to the mistake multi-medium data rebuild be correctly decoded multi-medium data and calculate the video quality measurement value, utilize described video quality measurement value to compare.
8, a kind of method that makes up the mistake multi-medium data comprises:
(1) makes up the multi-medium data bag, the index between the bag sequence number of setting up described multi-medium data bag and the corresponding multi-medium data;
(2) return the regional and non-mistake zone of the mistake of losing the data separation mistake place frame of preserving in Bale No. and the index file of coming according to receiving terminal; The described Bale No. of losing obtains by receiving terminal decoding or sampled point, and sends to monitor server by feedback channel;
(3) utilize described mistake zone and the non-mistake zone of finding out, and the index data of preserving in the described index file makes up the mistake multi-medium data.
9, the method for structure mistake multi-medium data according to claim 8, it is characterized in that, in the step (1), when sending multimedia code stream, carry out normal decode operation, set up index, and write index data, comprise data length, segment information, macro block, block message or the residual information of sequence number, index entry in the indexed file structure of foundation to index file.
10, the method for structure mistake multi-medium data according to claim 8, it is characterized in that, in the step (3), return the next multi-medium data of losing Bale No., index file and being correctly decoded, make up the multi-medium data that has mistake of receiving terminal in the monitor server simulation according to sampled point; Have in the process of multi-medium data of mistake at structure, only partial decoding of h carried out in the zone that influenced by mistake, be not subjected to zone that mistake influences directly from the multi-medium data that has been correctly decoded copy comes to fill; Described partial decoding of h is to utilize the information of preserving in the index file to carry out the reconstruction of multi-medium data, and readout code stream does not carry out complete decode operation from ASCII stream file ASCII.
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| CN2007100977929A CN101296166B (en) | 2007-04-29 | 2007-04-29 | Method for measuring multimedia data based on index |
| PCT/CN2008/000421 WO2008131636A1 (en) | 2007-04-29 | 2008-03-03 | A method for measuring the multimedia data |
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| CN2007100977929A CN101296166B (en) | 2007-04-29 | 2007-04-29 | Method for measuring multimedia data based on index |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012083737A1 (en) * | 2010-12-21 | 2012-06-28 | 中兴通讯股份有限公司 | Method, system and media client for detecting packet loss |
| CN104737518A (en) * | 2012-10-22 | 2015-06-24 | 华为技术有限公司 | Systems and methods for data representation and transportation |
| CN105379267A (en) * | 2013-07-11 | 2016-03-02 | 思科技术公司 | Endpoint information for network VQM |
| WO2018036483A1 (en) * | 2016-08-23 | 2018-03-01 | 华为技术有限公司 | Method, device and system implementing video quality evaluation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005192073A (en) * | 2003-12-26 | 2005-07-14 | Matsushita Electric Ind Co Ltd | Multimedia data communication method and apparatus |
| KR100541526B1 (en) * | 2004-01-30 | 2006-01-10 | 에스케이 텔레콤주식회사 | Methods and apparatus for multimedia data transmission quality measurement |
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2007
- 2007-04-29 CN CN2007100977929A patent/CN101296166B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012083737A1 (en) * | 2010-12-21 | 2012-06-28 | 中兴通讯股份有限公司 | Method, system and media client for detecting packet loss |
| CN104737518A (en) * | 2012-10-22 | 2015-06-24 | 华为技术有限公司 | Systems and methods for data representation and transportation |
| US9894421B2 (en) | 2012-10-22 | 2018-02-13 | Huawei Technologies Co., Ltd. | Systems and methods for data representation and transportation |
| CN104737518B (en) * | 2012-10-22 | 2018-11-16 | 华为技术有限公司 | The system and method for indicating and transmitting for data |
| CN105379267A (en) * | 2013-07-11 | 2016-03-02 | 思科技术公司 | Endpoint information for network VQM |
| CN105379267B (en) * | 2013-07-11 | 2019-06-07 | 思科技术公司 | For providing the method and apparatus of video quality management |
| WO2018036483A1 (en) * | 2016-08-23 | 2018-03-01 | 华为技术有限公司 | Method, device and system implementing video quality evaluation |
| CN107770617A (en) * | 2016-08-23 | 2018-03-06 | 华为技术有限公司 | A kind of methods, devices and systems for realizing video quality assessment |
| JP2019528635A (en) * | 2016-08-23 | 2019-10-10 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | Method, apparatus and system for performing video quality assessment |
| CN107770617B (en) * | 2016-08-23 | 2020-07-14 | 华为技术有限公司 | Method, device and system for realizing video quality evaluation |
| US10834383B2 (en) | 2016-08-23 | 2020-11-10 | Huawei Technologies Co., Ltd. | Method and apparatus for implementing video quality assessment of a GOP |
| US11310489B2 (en) | 2016-08-23 | 2022-04-19 | Huawei Technologies Co., Ltd. | Method, apparatus, and system for implementing video quality assessment |
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