WO2011144181A2

WO2011144181A2 - Method and network node for video quality evaluation

Info

Publication number: WO2011144181A2
Application number: PCT/CN2011/075497
Authority: WO
Inventors: 杨友庆; 刘济涛; 胡寅亮; 于文晓
Original assignee: 华为技术有限公司
Priority date: 2011-06-09
Filing date: 2011-06-09
Publication date: 2011-11-24
Also published as: CN102257831A; CN102257831B; WO2011144181A3

Abstract

A method and network node for video quality evaluation which belong to the communication field are disclosed in the present invention. The method includes the following steps that: the network node which is located at the network side obtains the video frame property information and decoder characteristic parameter of a video stream to be evaluated, wherein the video frame property information includes at least the video frame type and Quality Parameter (QP) of each video package of the video stream to be evaluated; the network node receives the damaged information of the video stream to be evaluated from a terminal; the network node evaluates the video quality of the video to be evaluated according to the video frame property information, decoder characteristic parameter and damaged information. The network node includes an obtaining module, a receiver and an evaluation module. The present invention can improve the accuracy of the video quality evaluation and reduce the effect of using terminals normally by users.

Description

Method and network node for video quality assessment

The present invention relates to the field of communications, and in particular, to a video quality assessment method and a network node. Background art

In the services transmitted on the Internet today, video services are increasingly becoming a major component of future network traffic. Because the video service has the characteristics of large data volume, high real-time requirements, and strong user sensitivity, the operator needs to monitor the quality of the transmitted video service to ensure the user's experience of the video service.

Among them, the method of evaluating the video quality can be used to monitor the quality of the book video service. A common video quality evaluation method is to deploy a video quality evaluation module in a user's set top box. After the set top box receives the video stream, the video quality evaluation module parses the network layer of the video stream to obtain the damaged information of the video stream, and then The application layer of the video stream is parsed, the video frame attribute information is obtained, and the obtained video frame attribute information, the damaged information, and the characteristic parameters of the decoder in the set top box are evaluated, and the evaluated result is sent to the network management center. .

Network faults or line faults mostly occur in the location close to the user side. The video stream received by the set-top box is often a damaged video stream, so that the video frame attribute information acquired by the video quality assessment module is often incomplete video frame attribute information, thereby Reduce the accuracy of the assessment. It is a very complicated process to analyze the video stream at the application layer and obtain the video frame attribute information. Therefore, it is necessary to consume a large amount of resources of the set top box, thereby affecting the normal use of the set top box by the user. Summary of the invention

In order to improve the accuracy of video quality assessment and reduce the impact on the user's normal use of the terminal, the present invention provides a method and network node for video quality assessment. The technical solution is as follows:

A method of video quality assessment, the method comprising:

The network node located at the network side acquires video frame attribute information of the video stream to be evaluated and characteristic parameters of the decoder, where the video frame attribute information includes at least a video frame type and QP of each video frame in the video stream to be evaluated. (Quality Parameter, quantization parameter);

Receiving, by the network node, the damaged information of the video stream to be evaluated sent by the terminal;

The network node performs video quality evaluation on the video stream to be evaluated according to the video frame attribute information, the characteristic parameter of the decoder, and the damaged information. A network node, the network node comprising:

An acquiring module, configured to acquire video frame attribute information of the video stream to be evaluated and a feature parameter of the decoder, where the video frame attribute information includes at least a video frame type and a QP of each video frame in the video stream to be evaluated;

a receiver, configured to receive, by the terminal, the damaged information of the video stream to be evaluated;

And an evaluation module, configured to perform video quality assessment on the video stream to be evaluated according to the video frame attribute information, the feature parameter of the decoder, and the damaged information.

In the present invention, the network node located at the network side acquires the video frame attribute information of the video stream to be evaluated and the characteristic parameter of the decoder, and the receiving terminal sends the damaged information of the video stream to be evaluated according to the video stream to be evaluated. Video frame attribute information, characteristic parameters of the decoder, and impairment information of the video stream are subjected to video quality evaluation of the video stream to be evaluated. Since the network node is located on the network side, the network node obtains the video frame attribute information of the video stream to be evaluated, so that the accuracy of the video quality assessment can be improved. In addition, since the network node acquires the video frame attribute information of the video stream to be evaluated, The terminal does not need to obtain the video frame attribute information, thereby reducing the consumption of the system resources of the terminal and reducing the impact on the user using the terminal. DRAWINGS

1 is a flowchart of a method for video quality evaluation according to Embodiment 1 of the present invention;

2 is a flowchart of a method for video quality evaluation according to Embodiment 2 of the present invention;

3 is a schematic diagram of a grid structure of an application of Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of a network node according to Embodiment 3 of the present invention. detailed description

In order to make the objects, the technical solutions and the advantages of the present invention more apparent, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Example 1

As shown in FIG. 1, an embodiment of the present invention provides a video quality assessment method, including:

Step 101: The network node located at the network side acquires video frame attribute information of the video stream to be evaluated and a characteristic parameter of the decoder, where the video frame attribute information includes at least each video frame type and QP in the video stream to be evaluated;

Step 102: The network node receives the damaged information of the video stream to be evaluated sent by the terminal.

Step 103: The network node performs video quality evaluation on the video stream to be evaluated according to the acquired video frame attribute information, the characteristic parameter of the decoder, and the damaged information. In the embodiment of the present invention, the network node located on the network side acquires the video frame attribute information of the video stream to be evaluated and the feature parameter of the decoder, and the receiving terminal sends the damaged information of the video stream to be evaluated according to the video stream to be evaluated. The video frame attribute information, the characteristic parameters of the decoder, and the impairment information of the video stream are evaluated for video quality of the video stream to be evaluated. The network node obtains the video frame attribute information of the video stream to be evaluated, so that the network node can obtain the video frame attribute information of the video to be evaluated. The terminal does not need to obtain the video frame attribute information of the video stream to be evaluated, thereby reducing the consumption of system resources of the terminal and reducing the impact on the user using the terminal. Example 2

As shown in FIG. 2, an embodiment of the present invention provides a video quality assessment method, including:

Step 201: The network node receives a video quality assessment initial setting message sent by the terminal.

When the terminal needs to perform video quality assessment, the terminal sends a video quality assessment initial setting message to the network node located at the network side, and the video quality assessment initial setting message is used to request the network node to perform video quality evaluation on the video stream to be evaluated.

The terminal can be a device such as a set top box, a television set, a mobile phone, a computer or a tablet that can decode the video stream.

According to the planning and deployment of the network, the MQMC (Media Quality Monitoring Centre) can inform the terminal of the address of the network node in advance and the network node is the edge network node of the access network where the terminal is located; or, the terminal is transmitting Send a request message for obtaining a network node to the video quality evaluation initial setting message

MQMC, MQMC selects a network node among the network nodes through which the video stream path between the video server and the terminal passes, and informs the terminal of the address of the selected network node. The MQMC can preferentially select network nodes whose idle resources are capable of satisfying the resources required for video quality assessment. The terminal then sends a video quality assessment initial setup message to the corresponding network node based on the address of the network node notified by the MQMC.

Wherein, when the terminal downloads the video stream, the downloaded video stream passes through the edge network node of the access network where the terminal is located, so

The MQMC can inform the terminal of the address of the edge network node of the access network where the terminal is located in advance.

Optionally, the network node in the network may periodically send the status of the idle resource to the MQMC, and the MQMC may know the idle resource in each network node in real time, and the MQMC may preferentially select the idle resource for the terminal to satisfy the video quality. A network node that evaluates the resources required.

Step 202: The network node returns a video quality assessment confirmation setting message to the terminal when the idle resource of the network meets the resources required for the video quality assessment.

For example, the idle resource of a network node refers to the remaining computing resources of the network node, such as CPU (Central)

Processing Unit, CPU, usage, free memory, free bandwidth, etc. When the preset conditions are met, such as The CPU usage of the network node does not exceed the preset usage rate. If the free memory is larger than the preset space and the idle bandwidth is greater than the preset bandwidth, it is determined that the network node has enough free resources for video quality assessment. .

If the network node itself does not have sufficient free resources for video quality assessment, the network node may send a notification message to the terminal, the notification message being used to instruct the terminal to reselect the network node. The terminal receives the notification message and sends a network node reselection request message to the MQMC. The MQMC selects a network node from the remaining network nodes of the video stream path of the video server and the terminal, transmits a reselection network node response message to the terminal, and the reselection network node response message carries the address of the selected network node. The MQMC can preferentially select network nodes whose idle resources are capable of satisfying the resources required for video quality assessment. The terminal then sends a video quality assessment initial setting message to the corresponding network node according to the address of the network node selected by the MQMC. The network node receives the video quality assessment initial setting message, and determines that the idle resource meets the resources required for the video quality assessment, and returns a video quality assessment setting message to the terminal.

Alternatively, if the network node itself does not have sufficient free resources for video quality assessment, the network node may send a notification message to the MQMC, which is used to instruct the MQMC to reselect the network node. The MQMC selects a network node from the remaining network nodes of the video stream path of the video server and the terminal, transmits a reselection network node response message to the terminal, and the reselection network node response message carries the address of the selected network node. The MQMC can preferentially select network nodes whose idle resources are capable of satisfying the resources required for video quality assessment. The terminal then sends a video quality assessment initial setting message to the corresponding network node according to the address of the network node selected by the MQMC. The network node receives the video quality assessment initial setting message, and determines that the idle resource meets the resources required for the video quality assessment, and returns a video quality assessment setting message to the terminal.

Step 203: The network node receives the video quality assessment setting request message sent by the terminal, and the video quality assessment setting request message carries the feature information of the decoder of the terminal and the video feature information of the video stream to be evaluated.

After receiving the video quality assessment confirmation setting message sent by the network node, the terminal acquires the feature information of the decoder and the video feature information of the video stream to be evaluated, and sends the feature information carrying the decoder and the video feature information of the video stream to be evaluated. The video quality assessment sets the request message to the network node.

The feature information of the decoder includes the model number of the decoder or information that can represent the model of the decoder. The video feature information of the video stream to be evaluated includes at least the destination address of the video stream to be evaluated. The video feature information of the video stream to be evaluated may also include a destination port number.

The terminal manufacturer can configure the feature information or the feature parameter of the decoder in the terminal in advance, so that the terminal can directly obtain the feature information or the feature parameter of the decoder configured by the terminal manufacturer.

Step 204: The network node acquires a feature parameter of the corresponding decoder according to the feature information of the decoder.

The network node may acquire the feature parameters of the corresponding decoder from the parameter database according to the feature information of the decoder. The operator can set the parameter database in the network in advance, and the parameter database is used to store the characteristic information of the decoder and the decoder. Correspondence of feature parameters. If the feature information of the decoder already contains the feature parameters of all the decoders required by the network node, the network node may also obtain the feature parameters of the decoder directly from the feature information of the decoder.

Step 205: The network node acquires video frame attribute information of the video stream to be evaluated according to the video feature information of the video stream to be evaluated, where the video frame attribute information includes at least the video frame type of each video frame in the video stream to be evaluated. And specifically, the network node obtains the video stream to be evaluated from the video stream that is to be evaluated according to the video feature information of the video stream to be evaluated, analyzes the video stream to be evaluated, and extracts video frame attribute information, where the extracted video The frame attribute information includes at least a video frame type and a QP of each video frame in the video stream to be evaluated.

The network node parses the application layer of the buffered video stream to be evaluated, and analyzes the buffered video stream to be evaluated at the application layer and extracts video frame attribute information.

The embodiment is applied to the network architecture shown in FIG. 3, in which the video server sends the video stream to be evaluated to the terminal, and the network node selected by the MQMC for the terminal is the video between the video server and the terminal. The network node through which the flow path passes, so the video stream sent by the video server to the terminal passes through the network node selected by the MQMC for the terminal.

After receiving the video quality assessment setting request message sent by the terminal, the network node may further determine, according to the video quality, the video feature information of the video stream to be evaluated carried in the request message, to determine whether the video stream to be evaluated is started to perform video quality assessment. If yes, the parsing operation is ended, and the video quality of the video stream to be evaluated is evaluated according to the parsed video frame attribute information. If not, the operation of acquiring the video frame attribute information of the video stream to be evaluated is continued. In this way, when multiple terminals simultaneously request the network node to perform video quality assessment on the same video stream, the network node can be parsed once for the video stream, which avoids repeatedly parsing the same video stream and saves resources.

The network node is located on the network side, and the network environment on the network side is better. When the video stream is transmitted in the network side, no damage or small damage occurs. Therefore, the video stream and the video server to be evaluated captured by the network node are obtained. The original video streams sent are the same or substantially the same, so the network node obtains the video frame attribute information of the video stream to be evaluated more complete than the video frame attribute information acquired by the terminal, thereby improving the accuracy of the video evaluation.

Further, the network node sends a video quality assessment setting response message to the terminal.

Step 206: The network node receives the damaged information of the video stream to be evaluated sent by the terminal.

The damaged information may include a packet sequence number of the vacated video packet and a PCR (Program Clock Reference) information; or, the damaged information may include a packet loss rate.

The terminal receives the video quality assessment setting response message, obtains the damaged information of the video stream to be evaluated, and then sends the damaged information of the video stream to be evaluated.

Further, the terminal may periodically send the damaged information of the video stream to be evaluated to the network node. The terminal obtains the damaged information of the video stream to be evaluated before sending the damaged information of the video stream to be evaluated. In this embodiment, the packet sequence number and the PCR information of the video packet with the damaged information including the vacant information are The example is explained.

The video stream includes video frames, each video frame includes one or more video packets, and the header of each video packet includes a packet sequence number of the video packet. Each video frame in the video stream is distinguished by a frame boundary marker in the video stream, and the frame boundary marker is located in the header of the first or last video packet of each video frame. When the video server transmits the video stream, the packet sequence number of each video packet included in each video frame in the video stream is continuous. In addition, the video stream further includes a TS PCR packet, and the TS PCR packet has PCR information in the header of the packet, and the video server periodically transmits the TS PCR packet when transmitting the video stream.

Correspondingly, the operation of the terminal acquiring the damaged information of the video stream to be evaluated may be: setting a cache queue in advance in the terminal. Extracting a packet included in the video stream to be evaluated, and determining the packet, if the packet is a TS PCR packet, extracting PCR information from the TS PCR packet; if the packet is a video packet, extracting a packet header of the video packet, and The extracted headers are sequentially cached in the buffer queue, and the terminal reads the header of one frame from the buffer queue according to the decoder decoding time interval, and analyzes the packet sequence number in the header of the read one frame, if the read one is analyzed. If the packet sequence number in the packet header is not continuous, the packet sequence number of the vacancy is obtained, and the obtained packet sequence number is the packet sequence number of the vacant video packet.

Step 207: The network node performs video quality assessment according to the damaged information of the video stream to be evaluated, the characteristic parameter of the decoder, the video frame type in the video frame attribute information, and the video stream to be evaluated by the QP.

The network node selects a corresponding calculation model according to the characteristic parameters of the decoder, and then performs video quality evaluation on the video stream to be evaluated according to the usual video quality evaluation method.

In this embodiment, the packet information and the PCR information of the vacancy video packet are taken as an example, and the network node may perform video quality assessment on the video stream to be evaluated according to the following steps, including:

The network node calculates a compression quality score for each video frame in the video stream to be evaluated based on the QP of each video frame.

The video stream to be evaluated sent by the video server is a compression-encoded video stream. And the video stream to be evaluated During the compression encoding, each video frame in the video stream to be evaluated is damaged. The compression quality score of each video frame in the video stream to be evaluated may reflect the extent to which each video frame is damaged during compression encoding.

The network node sequentially reads the included video frame from the video stream to be evaluated, according to the packet sequence number of the vacant video packet.

PCR information, obtaining the damage score of the currently read video frame.

Specifically, according to the packet sequence number of the vacant video packet and the PCR information and the PCR information of the currently read video frame, it is determined whether the currently read video frame has a damaged video packet, and if there is a damaged video packet and the damaged video packet For the first video packet of the current read video, set the percentage of the damaged area of the currently read video frame to the first fixed value; if there is a damaged video packet and the damaged video packet is not the currently read video frame The first video package, according to the size of the damaged video package, the percentage of damaged area of the damaged video package is set, and the percentage of damaged area of the damaged video package in the currently read video frame is performed. Superimposed to obtain the percentage of the damaged area of the currently read video frame; if there is no damaged video packet, set the percentage of the damaged area of the currently read video frame to a second fixed value; according to the damage of the currently read video frame Area Percent sets the damage score of the currently read video frame.

Wherein, the first fixed value may be 100%, and the second fixed value may be 0%. Since the first video packet in the video frame includes the sequence parameter set and the image parameter set of the video frame, if the first video packet is damaged, the image of the entire video frame is affected, so if the first video packet is damaged, The percentage of damaged area of the video frame is directly set to 100%.

The network node obtains the degree of influence of the currently read video frame on the reference frame according to the currently read video frame type, where the reference frame refers to a video frame that needs to be referenced or referenced when the currently read video frame is decoded.

Specifically, the network node determines, according to the video frame type of the currently read video frame, a reference frame of the currently read video frame, according to the image similarity between the currently read video frame and the reference frame, and the score of the reference frame. , determines the extent to which the currently read video frame is affected by the reference frame.

The network node calculates the score of the currently read video frame based on the characteristic parameters of the decoder, the compression quality score of the currently read video frame, the damage score, and the degree of influence of the reference frame.

The network node selects a corresponding calculation model according to the characteristic parameter of the decoder, and then calculates the current calculation result according to the compression quality score, the damage score and the influence degree of the reference frame of the currently read video frame, and the selected calculation model. The fraction of the video frame read. Wherein, the score of each video frame in the video stream to be evaluated is obtained as described above.

Since the network node receives the reference frame before receiving the currently read video frame, the score of the reference frame is calculated before calculating the score of the currently read video frame.

The network node calculates a score of the video stream to be evaluated based on the scores of the evaluated individual video frames.

Wherein, the network node may use the average of the scores of the respective video frames as the score of the video stream to be evaluated.

In the embodiment of the present invention, the network node located at the network side acquires the video stream to be evaluated sent by the video server, extracts video frame attribute information from the video stream to be evaluated, and the terminal obtains the received video stream to be evaluated. Loss information and PCR information, and send the obtained damaged information of the video stream to be evaluated to the network node, and the network node further evaluates according to the video frame attribute information of the video stream to be evaluated, the characteristic parameters of the decoder, and the damaged information. The video stream is evaluated. The network node obtains the video frame attribute information of the video stream to be evaluated, so that the network node can obtain the video frame attribute information of the video to be evaluated. Therefore, the terminal does not need to obtain the video frame attribute information of the video stream to be evaluated, thereby reducing the consumption of system resources of the terminal and reducing the impact on the normal use of the terminal by the user. Example 5

As shown in FIG. 4, an embodiment of the present invention provides a network node, including: The obtaining module 301 is configured to obtain video frame attribute information of the video stream to be evaluated and a feature parameter of the decoder, where the video frame attribute information includes at least a video frame type and a QP of each video frame in the video stream to be evaluated;

The receiver 302 is configured to receive the damaged information of the video stream to be evaluated sent by the terminal.

The evaluation module 303 is configured to perform video quality evaluation on the video stream to be evaluated according to the acquired video frame attribute information, the characteristic parameter of the decoder, and the damaged information.

The acquiring module 301 is specifically configured to receive a video quality assessment setting request message sent by the terminal, where the video quality assessment setting request message carries at least the feature information of the decoder and the video feature information of the video stream to be evaluated; Feature information, obtaining a feature parameter of the decoder from the parameter database; obtaining a video stream to be evaluated from the video stream passing through the network node according to the video feature information of the video stream to be evaluated; and buffering the obtained video stream to be evaluated, The cached video stream to be evaluated is analyzed and the video frame attribute information is extracted.

The obtaining module 301 parses the buffered video stream to be evaluated to the application layer, and analyzes the buffered video stream to be evaluated at the application layer and extracts video frame attribute information.

The obtaining module 301 can obtain the feature parameters of the corresponding decoder from the parameter database according to the feature information of the decoder. In addition, if the feature information of the decoder already includes the feature parameters of all the decoders required by the network node, the network node may also directly obtain the feature parameters of the decoder from the feature information of the decoder.

After receiving the video quality assessment setting request message sent by the terminal, the obtaining module 301 may further determine, according to the video feature information of the video stream to be evaluated carried in the request message, whether the video stream to be evaluated has been parsed. If yes, the parsing operation is ended, and the video quality of the video stream to be evaluated is evaluated according to the parsed video frame attribute information. If not, the operation of acquiring the video frame attribute information of the video stream to be evaluated is continued. In this way, when multiple terminals simultaneously request the network node to perform video quality assessment on the same video stream, the network node can be parsed once, which avoids repeatedly parsing the same video stream and saves resources.

The terminal obtains the damaged information of the video stream to be evaluated before sending the damaged information. In this embodiment, the packet information and the PCR information of the vacant video packet are taken as an example, and the terminal obtains the corresponding information. The video feature information of the video stream to be evaluated may be: A buffer queue is set in advance in the terminal. Extracting a packet included in the video stream to be evaluated, and determining the packet, if the packet is a TS PCR packet, extracting PCR information from the TS PCR packet; if the packet is a video packet, extracting a packet header of the video packet, and The extracted packet headers are sequentially cached in the buffer queue, and the terminal reads the header of one frame from the buffer queue according to the decoder decoding time interval, and analyzes the packet sequence number in the header of the read one frame, if If the packet sequence number in the header of one frame of the readout is not continuous, the packet sequence number of the vacancy is obtained, and the obtained packet number of the vacancy is the packet sequence number of the vacant video packet.

Correspondingly, the evaluating module 303 is specifically configured to calculate, according to the QP of each video frame, a compression quality score of each video frame in the video stream to be evaluated; and sequentially read the included video from the video stream to be evaluated. a frame, obtaining a damaged score of the currently read video frame according to the packet sequence number and the PCR information of the vacant video packet; and acquiring, according to the video frame type of each video frame, the degree of influence of each video frame by the reference frame; The compression quality score of the video frames, the damage score and the degree of influence of the reference frame, and the characteristic parameters of the decoder, calculate the score of each video frame; calculate the video stream to be evaluated according to the score of each video frame The score.

Further, the network node further includes:

The first notification module is configured to receive a video quality assessment initial setting message sent by the terminal, and if the remaining idle resources of the terminal do not meet the resources required for the video quality assessment, send a notification message to the terminal, so that the terminal is reselected for video quality assessment. Network node.

Further, the network node further includes:

The second notification module is configured to receive a video quality assessment initial setting message sent by the terminal, and if the remaining idle resources of the terminal do not meet the resources required for the video quality assessment, send a notification message to the media quality monitoring center MQMC, so that the MQMC is the terminal. Reselect the network nodes used for video quality assessment.

Among them, the resources required for video quality assessment include CPU usage, free memory, and free bandwidth. If the CPU usage of the network node does not exceed the preset usage rate, the free memory is larger than the preset space size and idle. If the bandwidth is greater than the preset bandwidth, the first notification module or the second notification module determines that the network node has sufficient resources for performing video quality assessment. Otherwise, the first notification module or the second notification module determines that the network node does not have a network node. Sufficient resources for video quality assessment.

Further, the network node further includes:

a determining module, configured to determine, according to the video feature information of the video stream to be evaluated, whether the video frame attribute information of the video stream to be evaluated has been obtained, and if yes, perform video on the video stream to be evaluated according to the acquired video frame attribute information Quality assessment.

In the embodiment of the present invention, the network node located at the network side receives the video stream to be evaluated sent by the video server, and obtains the damage from the video stream attribute to be evaluated from the video stream to be evaluated. The information is sent to the network node, and the network node sends the damaged information of the video stream to be evaluated to the network node, and the network node performs the video stream to be evaluated according to the video frame attribute information of the video stream to be evaluated, the characteristic parameter of the decoder, and the damaged information. Evaluation. The network node is located on the network side, and the network node obtains the video frame attribute information of the video stream to be evaluated, so as to improve the accuracy of the video quality assessment. In addition, because the network node obtains the video frame attribute information of the video to be evaluated, The terminal does not need to acquire The video frame attribute information of the evaluated video stream, thereby reducing the consumption of system resources of the terminal and reducing the impact on the normal use of the terminal by the user. All or part of the technical solutions provided by the above embodiments may be implemented by software programming, and the software program is stored in a readable storage medium such as a hard disk, an optical disk or a floppy disk in a computer. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim

A method for video quality assessment, the method comprising:

The network node located at the network side acquires video frame attribute information of the video stream to be evaluated and characteristic parameters of the decoder, where the video frame attribute information includes at least a video frame type and quantization of each video frame in the video stream to be evaluated. a parameter QP; the network node receiving the damaged information of the video stream to be evaluated sent by the terminal;

And the network node performs video quality assessment on the video stream to be evaluated according to the video frame attribute information, the characteristic parameter of the decoder, and the damaged information.

The method of claim 1, wherein the acquiring video frame attribute information and the characteristic parameters of the decoder of the video stream to be evaluated includes:

Receiving, by the network node, a video quality assessment setting request message sent by the terminal, where the video quality assessment setting request message carries at least feature information of the decoder and video feature information of the video stream to be evaluated;

The network node acquires a feature parameter of the decoder according to the feature information of the decoder;

And obtaining, by the network node, the video stream to be evaluated from the video stream that passes through the network node according to the video feature information of the video stream to be evaluated;

The network node caches the obtained video stream to be evaluated, analyzes the buffered video stream to be evaluated, and extracts video frame attribute information.

The method according to claim 1 or 2, wherein before the obtaining the video frame attribute information of the video stream to be evaluated and the characteristic parameters of the decoder, the method further includes:

Receiving, by the network node, a video quality assessment initial setting message sent by the terminal, if the remaining idle resources of the terminal do not meet the resources required for the video quality assessment, sending a notification message to the terminal, so that the terminal is reselected for the terminal Network node for video quality assessment.

The method according to claim 1 or 2, wherein before the acquiring the video frame attribute information of the video stream to be evaluated and the characteristic parameters of the decoder, the method further includes:

Receiving, by the network node, a video quality assessment initial setting message sent by the terminal, if the remaining idle resources of the terminal do not meet the resources required for the video quality assessment, sending a notification message to the media quality monitoring center MQMC, so that the MQMC is The terminal reselects a network node for video quality assessment.

The method according to any one of claims 2 to 4, wherein, after receiving the video quality assessment setting request message sent by the terminal, the method further includes:

Determining, according to the video feature information of the video stream to be evaluated, whether the video frame attribute information of the video stream to be evaluated has been acquired, and if yes, the to-be-obtained video frame attribute information The evaluated video stream is evaluated for video quality.

6. A network node, wherein the network node comprises:

And an acquiring module, configured to acquire video frame attribute information of the video stream to be evaluated and a feature parameter of the decoder, where the video frame attribute information includes at least a video frame type and a quantization parameter of each video frame in the video stream to be evaluated. QP;

7. The network node of claim 6 wherein:

The acquiring module is specifically configured to receive a video quality assessment setting request message sent by the terminal, where the video quality assessment setting request message carries at least feature information of the decoder and video feature information of the video stream to be evaluated; The feature information of the decoder is obtained from the parameter database, and the video stream to be evaluated is obtained from the video stream passing through the network node according to the video feature information of the video stream to be evaluated. And buffering the obtained video stream to be evaluated, analyzing the buffered video stream to be evaluated, and extracting video frame attribute information.

The network node according to claim 6 or 7, wherein the network node further comprises: a first notification module, configured to receive a video quality assessment initial setting message sent by the terminal, if the remaining idle If the resource does not satisfy the resources required for video quality assessment, a notification message is sent to the terminal, causing the terminal to reselect the network node for video quality assessment.

The network node according to claim 6 or 7, wherein the network node further comprises: a second notification module, configured to receive a video quality assessment initial setting message sent by the terminal, if the remaining idle If the resource does not meet the resources required for the video quality assessment, the notification message is sent to the media quality monitoring center MQMC, so that the MQMC reselects the network node for the video quality assessment for the terminal.

The network node according to any one of claims 7 to 9, wherein the network node further comprises:

a determining module, configured to determine, according to the video feature information of the video stream to be evaluated, whether the video frame attribute information of the video stream to be evaluated has been acquired, and if yes, according to the acquired video frame attribute information The video stream to be evaluated is evaluated for video quality.