CN115720257B - Communication security management method and system for video conference system - Google Patents
Communication security management method and system for video conference system Download PDFInfo
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- CN115720257B CN115720257B CN202211251527.2A CN202211251527A CN115720257B CN 115720257 B CN115720257 B CN 115720257B CN 202211251527 A CN202211251527 A CN 202211251527A CN 115720257 B CN115720257 B CN 115720257B
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Abstract
The invention discloses a communication safety management method and a system of a video conference system, and relates to the technical field of communication video, wherein the method comprises the steps of presetting a multi-level ip network unit, setting authority of the multi-level ip network unit, and obtaining conference channel conditions according to the authority and conference requirements; judging whether the video transmission mode is in the same channel according to the conference channel condition, and if the video transmission mode is not in the same channel, selecting the first video transmission mode to carry out video transmission; if the video is in the same channel, selecting a second video transmission mode for video transmission, and when the second video transmission mode is transmitted, predicting QoE scores of the video according to a preset QoE prediction model, and switching the second video transmission mode into the first video transmission mode or controlling video transmission basic parameters according to the QoE scores. The adaptability of video parameters and bandwidth is improved through the control of the first video transmission mode and the second video transmission mode, so that the reliability of the video conference is improved.
Description
Technical Field
The present disclosure relates to the field of video communication technologies, and in particular, to a communication security management method and system for a video conference system.
Background
Video conferencing refers to a conference in which people located at two or more sites are talking face-to-face through a communication device and a network. Video conferences can be divided into point-to-point conferences and multipoint conferences, depending on the number of sites involved. Individuals in daily life have no requirements on conversation content safety, conference quality and conference scale, and video chat can be performed by adopting video software such as messenger QQ. In contrast, in business video conferences of government authorities and enterprises, conditions such as stable and safe network, reliable conference quality, formal conference environment and the like are required, professional video conference equipment is required to be used, and a special video conference system is required to be built. Such video conference systems are also called video conferences and video conferences because they are displayed using a television. By using the video conference system, a participant can hear the sound of other meeting places, see the images, actions and expressions of the participants of other meeting places, and can also send electronic demonstration contents, so that the participant has the feeling of being personally on the scene.
In the existing video conference technology, the conference mainly shows two types, one is a face speech of a participant, the spirit or indication content of the conference is conveyed through personnel lectures, and the other is electronic content display such as electronic document demonstration. When the electronic content is displayed and transmitted, the occupied resources are less, and the communication reliability is higher. However, when the participants speak, because the real-time video is transmitted, the video occupies larger resources, and the communication channels among different ip levels are different, so that the bandwidth resources are different, and the requirements of video communication transmission cannot be met, thereby causing the problems of lower definition of the transmitted video, high video code rate and the like, and poor adaptability of the video and the channel bandwidth.
Therefore, how to improve the suitability of video parameters and bandwidth of a video conference is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a communication security management method of a video conference system, which is used for solving the technical problem of poor adaptability of video and channel bandwidth in the prior art. The method comprises the following steps:
the method comprises the steps of presetting a multi-level ip network unit, wherein the multi-level ip network unit comprises a first-level unit, a second-level unit and a third-level unit, the first-level unit is provided with a plurality of second-level units, the second-level unit is provided with a plurality of third-level units, the first preset communication means are adopted for communication between the first-level unit and the second-level unit, the second preset communication means are adopted for communication between the second-level unit and the third-level unit, the authority of the multi-level ip network unit is set, and the conference channel condition is obtained according to the authority and conference requirements;
judging whether the video transmission mode is in the same channel according to the conference channel condition, and if the video transmission mode is not in the same channel, selecting the first video transmission mode to carry out video transmission;
if the video is in the same channel, selecting a second video transmission mode for video transmission, and when the second video transmission mode is transmitted, predicting QoE scores of the video according to a preset QoE prediction model, and switching the second video transmission mode into the first video transmission mode or controlling video transmission basic parameters according to the QoE scores.
In some embodiments of the present application, the first video transmission mode is:
determining a transmitting end and a receiving end in a multi-level ip network unit;
the method comprises the steps that a sending end obtains a video stream, encodes the video stream into low-code-rate information, and sends the low-code-rate information to a receiving end;
the receiving end decodes the low code rate information to reconstruct the video stream.
In some embodiments of the present application, a transmitting end obtains a video stream, encodes the video stream into low-bitrate information, and transmits the low-bitrate information to a receiving end, which specifically includes:
the video stream is composed of a plurality of sections of GOP and a plurality of sections of GOV, wherein the GOP is a group of continuous pictures, and the GOV is a group of continuous audios;
taking the first frame image of each GOP section as a reference frame, substituting the reference frame into a first preset neural network, a second preset neural network and a third preset neural network to obtain characterization information, and transmitting the characterization information to a receiving end;
taking a frame image after the first frame image of each GOP section as a key frame, extracting head characteristic information of the key frame through a second preset neural network, and transmitting the head characteristic information to a receiving end;
the GOV is sent to the receiving end based on timing synchronization with the GOP.
In some embodiments of the present application, substituting the reference frame into the first preset neural network, the second preset neural network, and the third preset neural network to obtain the characterization information, and transmitting the characterization information to the receiving end specifically includes:
The characterization information comprises general characteristic information of the reference frame, head characteristic information of the reference frame and character identity characteristic information of the reference frame;
extracting general feature information of the reference frame through a first preset neural network based on the reference frame, extracting head feature information of the reference frame through a second preset neural network based on the reference frame, extracting character identity feature information of the reference frame through a third preset neural network based on the reference frame, and transmitting the general feature information, the head feature information of the reference frame and the character identity feature information of the reference frame to a receiving end;
the low code rate information includes characterization information and header feature information of the key frame.
In some embodiments of the present application, the receiving end decodes the low code rate information to reconstruct the video stream, specifically:
substituting the characterization information into a fourth preset neural network to obtain motion characteristic information, and substituting the motion characteristic information and the head characteristic information of the key frame into a fifth preset neural network to obtain a video stream.
In some embodiments of the present application, a QoE score of a video is predicted according to a preset QoE prediction model, and the second video transmission mode is switched to the first video transmission mode or the control video transmission basic parameter according to the QoE score, specifically:
If the QoE score is larger than the first preset score value, continuing to transmit the video through the second video transmission mode;
if the QoE score is not greater than the first preset score value and the QoE score is greater than the second preset score value, controlling the video transmission basic parameters;
if the QoE score is not greater than a second preset score value, switching the second video transmission mode to the first video transmission mode;
wherein the first preset score value is greater than the second preset score value.
In some embodiments of the present application, the control video basic parameters are specifically:
the method comprises the steps of obtaining the number of videos in a channel, and controlling video transmission basic parameters according to the number of the videos in the channel, wherein the video transmission basic parameters comprise video code rate, video resolution and video frame rate;
when the video code rate is controlled according to the video quantity in a channel, setting the video quantity in the channel as A, presetting an array A0 (A1, A2, A3 and A4) of the video quantity in the channel, wherein the video quantity in a first preset channel is A1, the video quantity in a second preset channel is A2, the video quantity in a third preset channel is A3, the video quantity in a fourth preset channel is A4, and A1 is more than A2 and less than A3 and less than A4;
a preset video code rate array B0 (B1, B2, B3, B4), wherein the first preset video code rate is B1, the second preset video code rate is B2, the third preset video code rate is B3, the fourth preset video code rate is B4, and B1 is more than B2 and less than B3 and less than B4;
Controlling video code rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is less than or equal to A2, selecting a second preset video code rate B2 as the video code rate;
if A2 is less than or equal to A3, selecting a third preset video code rate B3 as the video code rate;
if A3 is less than or equal to A4, selecting a fourth preset video code rate B4 as the video code rate.
In some embodiments of the present application, when controlling video resolution according to the number of videos in a channel;
a preset video resolution array C0 (C1, C2, C3, C4), wherein the first preset video resolution is C1, the second preset video resolution is C2, the third preset video resolution is C3, the fourth preset video resolution is C4, and C1 > C2 > C3 > C4;
controlling video resolution according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video resolution C1 as the video resolution;
if A1 is less than or equal to A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is less than or equal to A3, selecting a third preset video resolution C3 as the video resolution;
if A3 is less than or equal to A4, selecting a fourth preset video resolution C4 as the video resolution.
In some embodiments of the present application, when controlling the video frame rate according to the number of videos in a channel;
a preset video frame rate array D0 (D1, D2, D3, D4), wherein the first preset video frame rate is D1, the second preset video frame rate is D2, the third preset video frame rate is D3, the fourth preset video frame rate is D4, and D1 > D2 > D3 > D4;
controlling video frame rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video frame rate D1 as the video frame rate;
if A1 is less than or equal to A2, selecting a second preset video frame rate D2 as the video frame rate;
if A2 is less than or equal to A3, selecting a third preset video frame rate D3 as the video frame rate;
if A3 is less than or equal to A4, selecting a fourth preset video frame rate D4 as the video frame rate.
Correspondingly, the application also provides a communication security management system of the video conference system, which comprises:
the communication module is used for presetting a multi-level ip network unit, the multi-level ip network unit comprises a first-level unit, a second-level unit and a third-level unit, the first-level unit is provided with a plurality of second-level units, the second-level unit is provided with a plurality of third-level units, the first-level unit and the second-level unit are communicated by adopting a first preset communication means, the second-level unit and the third-level unit are communicated by adopting a second preset communication means, the authority of the multi-level ip network unit is set, and the conference channel condition is obtained according to the authority and conference requirements;
The transmission module is used for judging whether the video transmission mode is in the same channel according to the conference channel condition, and if the video transmission mode is not in the same channel, selecting the first video transmission mode to carry out video transmission;
the control module is used for selecting a second video transmission mode to transmit video if the second video transmission mode is in the same channel, predicting QoE scores of the video according to a preset QoE prediction model when the second video transmission mode is transmitted, and switching the second video transmission mode into the first video transmission mode or controlling video transmission basic parameters according to the QoE scores.
By applying the technical scheme, the multi-level ip network unit is preset, the multi-level ip network unit comprises a first-level unit, a second-level unit and a third-level unit, the first-level unit is provided with a plurality of second-level units, the second-level unit is provided with a plurality of third-level units, the first-level unit and the second-level unit are communicated by adopting a first preset communication means, the second-level unit and the third-level unit are communicated by adopting a second preset communication means, the authority of the multi-level ip network unit is set, and the conference channel condition is obtained according to the authority and conference requirements; judging whether the video transmission mode is in the same channel according to the conference channel condition, and if the video transmission mode is not in the same channel, selecting the first video transmission mode to carry out video transmission; if the video is in the same channel, selecting a second video transmission mode for video transmission, and when the second video transmission mode is transmitted, predicting QoE scores of the video according to a preset QoE prediction model, and switching the second video transmission mode into the first video transmission mode or controlling video transmission basic parameters according to the QoE scores. According to the video transmission method, firstly, through setting different levels of ip units, channel conditions are determined through conference conditions, different channels and bandwidths can change, a first video transmission mode is selected for conference, namely video characteristic information is extracted, video reconstruction is carried out, and therefore video transmission is completed. In the same channel, a second video transmission mode is adopted for transmission, namely a normal transmission means is adopted, and video mode change or video transmission basic parameter change is controlled according to QoE scores. The first video transmission mode can effectively reduce the transmission code rate, reduce the bandwidth pressure and improve the definition of the figure image and the figure action precision. The adaptability of video parameters and bandwidth is improved through the control of the first video transmission mode and the second video transmission mode, so that the reliability of the video conference is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a multi-level ip in a communication security management method of a video conference system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a communication security management method of a video conference system according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a first video transmission mode according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication security management system of a video conference system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The embodiment of the application provides a communication security management method of a video conference system, as shown in fig. 2, the method comprises the following steps:
step S101, presetting a multi-level ip network unit, wherein the multi-level ip network unit comprises a first-level unit, a second-level unit and a third-level unit, the first-level unit is provided with a plurality of second-level units, the second-level unit is provided with a plurality of third-level units, the first-level unit and the second-level unit are communicated by adopting a first preset communication means, the second-level unit and the third-level unit are communicated by adopting a second preset communication means, the authority of the multi-level ip network unit is set, and the conference channel condition is obtained according to the authority and conference requirements.
As shown in fig. 1, in this embodiment, in order to satisfy a complex conference service, multiple levels of ip network elements are set in advance. The first preset communication means comprises an optical fiber and a satellite, namely, the primary unit and the secondary unit adopt optical fiber and satellite communication, so that wired and wireless mutual backup is realized. The three-level unit is a maneuvering unit, and different communication means are adopted according to the distance between the three-level unit and the two-level unit. The second preset communication means comprises optical fibers, satellites, scattering and the like, namely, one or more means of the optical fibers, the satellites, the scattering and the like are adopted to communicate between the secondary unit and the tertiary unit, and all the means are mutually backed up. Because different communication means have larger differences in networking, bandwidth, time delay and the like, the network environment is complex, and different video transmission modes are needed to improve the adaptability.
The authority of each level of network elements is set to organize various types of conferences. The first level unit authority is high, the second level unit authority is medium, and the third level unit authority is low. Conference types include, but are not limited to, the following four:
1. the first-level unit organizes conferences participated by all subordinate second-level and third-level units, and is a large-scale conference;
2. the first-level unit organizes the conference in which only subordinate second-level units participate into a multi-unit conference;
3. the first-level unit organizes conferences participated by the subordinate third-level unit, and the conferences are cross-level conferences;
4. the secondary unit independently organizes conferences of subordinate tertiary units, which are subordinate conferences.
It is understood that the primary unit, the secondary unit, and the tertiary unit correspond to different units, mechanisms, organizations, and the like. The units of each level can organize conferences with units of each level, and the conferences generally adopt the same communication means and the same channels. And obtaining the conference channel condition according to the authority and the specific conference requirement.
Step S102, judging whether the video transmission mode is in the same channel according to the conference channel condition, and if the video transmission mode is not in the same channel, selecting the first video transmission mode to carry out video transmission.
In this embodiment, whether the video conference adopts the same channel is determined according to the conference channel condition, and different video transmission modes are adopted according to different channel conditions. If the video transmission mode is not in the same channel, the data difference of bandwidth and the like is large, and the first video transmission mode is selected for video transmission. The first video transmission mode, namely, the video stream (image stream) is coded and converted into low-code rate information, and the receiving end decodes the low-code rate information and restores the original video (original image).
For example, when the same video source is watched between units of different channels, optical fiber communication is adopted between the first-stage unit and the second-stage unit, the video of the first-stage unit is watched by the second-stage unit and the third-stage unit is high-definition video, satellite and scattering communication are adopted between the second-stage unit and the third-stage unit, parameters such as video image quality and the like need to be reduced for watching when the third-stage unit watches the video of the first-stage unit under normal conditions, for example, standard definition video or lower resolution video, and for the problem, a first video transmission mode is established.
In order to improve the reliability of video transmission, in some embodiments of the present application, as shown in fig. 3, the first video transmission mode includes the following steps:
step S201, determining a transmitting end and a receiving end in a multi-level ip network unit;
step S202, a transmitting end acquires a video stream, encodes the video stream into low-code-rate information, and transmits the low-code-rate information to a receiving end;
in step S203, the receiving end decodes the low code rate information to reconstruct the video stream.
In this embodiment, it is determined who is the transmitting end and who is the receiving end in the three level units. The transmitting end encodes the video stream into low code rate information, which comprises two parts, wherein one part is used for acquiring the characteristic information (characterization information) of the reference frame, and the other part is used for acquiring the characteristic information (head characteristic information) of the key frame. The receiving end processes the characterization information and the head characteristic information to obtain an original image or an original video.
The existing video transmission principle: the video is composed of a frame image and a group of audios, and the playing process of the video can be simply understood as a process that pictures of a frame are presented according to time sequence. In practical applications, however, not every frame is a complete picture, because if every frame is a complete picture, the volume of a video is very large. This is too costly for network transmission or video data storage, so that a portion of the pictures in the video stream are typically compressed (encoded). The encoder encodes the multiple images to produce a segment-by-segment GOP (Group of Pictures). The audio group is GOV (Group of Voice).
In order to further improve reliability of video transmission, in some embodiments of the present application, a transmitting end obtains a video stream, encodes the video stream into low-bitrate information, and transmits the low-bitrate information to a receiving end, where the method specifically includes: the video stream is composed of a plurality of sections of GOP and a plurality of sections of GOV, wherein the GOP is a group of continuous pictures, and the GOV is a group of continuous audios; taking the first frame image of each GOP section as a reference frame, substituting the reference frame into a first preset neural network, a second preset neural network and a third preset neural network to obtain characterization information, and transmitting the characterization information to a receiving end; taking a frame image after the first frame image of each GOP section as a key frame, extracting head characteristic information of the key frame through a second preset neural network, and transmitting the head characteristic information to a receiving end; the GOV is sent to the receiving end based on timing synchronization with the GOP.
In this embodiment, the first preset neural network is configured to obtain general feature information of the reference frame, that is, basic features of the image, including basic features such as brightness, color, texture, and direction features. The second preset neural network is used for acquiring head characteristic information of the person in the reference frame, wherein the head characteristic comprises gesture information, expression information and the like. The third preset neural network is used for acquiring the identity characteristics of the person in the reference frame, wherein the identity characteristics of the person comprise identity information such as a face, an iris and the like. And taking frames except the first frame in the GOP as key frames, and extracting head characteristic information of the key frames. The GOV is sent to the receiving end along with the time synchronism of GOP frames.
In order to improve accuracy of feature extraction, in some embodiments of the present application, a reference frame is substituted into a first preset neural network, a second preset neural network, and a third preset neural network to obtain characterization information, and the characterization information is transmitted to a receiving end, where the method specifically includes: the characterization information comprises general characteristic information of the reference frame, head characteristic information of the reference frame and character identity characteristic information of the reference frame; extracting general feature information of the reference frame through a first preset neural network based on the reference frame, extracting head feature information of the reference frame through a second preset neural network based on the reference frame, extracting character identity feature information of the reference frame through a third preset neural network based on the reference frame, and transmitting the general feature information, the head feature information of the reference frame and the character identity feature information of the reference frame to a receiving end; the low code rate information includes characterization information and header feature information of the key frame.
In order to further improve accuracy of feature extraction, in some embodiments of the present application, the receiving end decodes the low code rate information to reconstruct the video stream, specifically: substituting the characterization information into a fourth preset neural network to obtain motion characteristic information, and substituting the motion characteristic information and the head characteristic information of the key frame into a fifth preset neural network to obtain a video stream.
In this embodiment, the fourth preset neural network is used to predict the motion feature information before the features extracted by the reference frame and the features transmitted by the key frame, so as to improve the generation effect of the picture. The fifth preset neural network is used for recovering the original image according to the motion characteristic information and the head characteristic information of the key frame.
Step S103, if the video is in the same channel, selecting a second video transmission mode for video transmission, and when the second video transmission mode is transmitted, predicting QoE scores of the video according to a preset QoE prediction model, and switching the second video transmission mode into the first video transmission mode or controlling video transmission basic parameters according to the QoE scores.
In this embodiment, the conference is in the same channel, and the bandwidth and other data are basically unchanged, and a conventional video transmission mode (the transmitting end transmits the video and audio codes to the receiving end and decodes the video and audio codes) is adopted, that is, the second video transmission mode. In the process, a QoE predictive model is adopted to predict the QoE score of the video, and the fact that the QoE score is too low indicates that the video quality is very poor, and a first video transmission mode is required to be adopted for transmission. The QoE score generally indicates that the quality is still within an acceptable range, and only the video transmission basic parameters need to be adjusted.
When the conference is in the same channel, for example, the primary unit, the secondary unit and the tertiary unit all adopt MF-TDMA satellite network networking, the available resources of satellites are limited, and a shared channel mode is generally adopted at the moment, so that better communication service is realized. Therefore, the number of videos transmitted in the shared channel is identified, and the code rate, the frame rate and the resolution of each video are dynamically controlled and adjusted according to the number. And the channel bandwidth is reasonably utilized, so that the optimal balance between the available bandwidth and the video quality is realized.
Conventional methods of evaluating network application quality of service typically focus on network-level parameters such as bandwidth, packet loss, delay, jitter, etc., which are referred to as QoS (Quality of Service) parameters. However, for some applications, especially video-type applications, qoS parameters merely describe the situation where the network is transmitting data, and do not directly reflect the experience of the application user. The concept of QoE (Quality of Experience) was introduced thereby to represent the overall experience of a person with a web application.
Presetting a QoE prediction model process: a Pseudo-subjective assessment algorithm (Pseudo-Subjective Quality Assessment methods, PSQA) was used to build the model. In PSQA, an application scene is first defined, where the scene includes some features of the video application and its running environment, such as video resolution, coding algorithm, video type, etc. In this context, a set of factors are defined that have an impact on the QoE of a video application, which are typically a set of network or application parameters that can be measured, such as the code rate, frame rate, packet loss rate, etc. of the video. This is called quality impact factor (QAF). And then establishing a distorted video database, wherein each distorted video corresponds to one QAF influence factor vector, and evaluating the user experience quality of the distorted videos by adopting a subjective test method. A predictive model is built based on the subjective test data, and the model can evaluate QoE scores of the video according to the influence factor vectors. Higher scores represent better video viewing quality.
In order to improve video transmission reliability, in some embodiments of the present application, a QoE score of a video is predicted according to a preset QoE prediction model, and a second video transmission mode is switched to a first video transmission mode or a control video transmission basic parameter according to the QoE score, which specifically includes: if the QoE score is larger than the first preset score value, continuing to transmit the video through the second video transmission mode; if the QoE score is not greater than the first preset score value and the QoE score is greater than the second preset score value, controlling the video transmission basic parameters; if the QoE score is not greater than a second preset score value, switching the second video transmission mode to the first video transmission mode; wherein the first preset score value is greater than the second preset score value.
In this embodiment, if the QoE score is greater than the first preset score value, it indicates that the video transmission quality is better, and video transmission is continued through the second video transmission mode. If the QoE score is not greater than the first preset score value and the QoE score is greater than the second preset score value, the video transmission quality is general, and the video transmission basic parameters are controlled. If the QoE score is not greater than the second preset score value, it indicates that the video transmission quality is very poor, and the video transmission mode needs to be changed, so that the second video transmission mode is switched to the first video transmission mode.
In order to improve accuracy of video basic parameter control, in some embodiments of the present application, the video basic parameters are controlled by:
the method comprises the steps of obtaining the number of videos in a channel, and controlling video transmission basic parameters according to the number of the videos in the channel, wherein the video transmission basic parameters comprise video code rate, video resolution and video frame rate;
when the video code rate is controlled according to the video quantity in a channel, setting the video quantity in the channel as A, presetting an array A0 (A1, A2, A3 and A4) of the video quantity in the channel, wherein the video quantity in a first preset channel is A1, the video quantity in a second preset channel is A2, the video quantity in a third preset channel is A3, the video quantity in a fourth preset channel is A4, and A1 is more than A2 and less than A3 and less than A4;
a preset video code rate array B0 (B1, B2, B3, B4), wherein the first preset video code rate is B1, the second preset video code rate is B2, the third preset video code rate is B3, the fourth preset video code rate is B4, and B1 is more than B2 and less than B3 and less than B4;
controlling video code rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is less than or equal to A2, selecting a second preset video code rate B2 as the video code rate;
If A2 is less than or equal to A3, selecting a third preset video code rate B3 as the video code rate;
if A3 is less than or equal to A4, selecting a fourth preset video code rate B4 as the video code rate.
In some embodiments of the present application, when controlling video resolution according to the number of videos in a channel;
a preset video resolution array C0 (C1, C2, C3, C4), wherein the first preset video resolution is C1, the second preset video resolution is C2, the third preset video resolution is C3, the fourth preset video resolution is C4, and C1 > C2 > C3 > C4;
controlling video resolution according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video resolution C1 as the video resolution;
if A1 is less than or equal to A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is less than or equal to A3, selecting a third preset video resolution C3 as the video resolution;
if A3 is less than or equal to A4, selecting a fourth preset video resolution C4 as the video resolution.
In some embodiments of the present application, when controlling the video frame rate according to the number of videos in a channel;
a preset video frame rate array D0 (D1, D2, D3, D4), wherein the first preset video frame rate is D1, the second preset video frame rate is D2, the third preset video frame rate is D3, the fourth preset video frame rate is D4, and D1 > D2 > D3 > D4;
Controlling video frame rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video frame rate D1 as the video frame rate;
if A1 is less than or equal to A2, selecting a second preset video frame rate D2 as the video frame rate;
if A2 is less than or equal to A3, selecting a third preset video frame rate D3 as the video frame rate;
if A3 is less than or equal to A4, selecting a fourth preset video frame rate D4 as the video frame rate.
In this embodiment, the video transmission basic parameters are controlled according to the number of videos transmitted in the channel, and the code rate, the frame rate and the resolution of each path of video are dynamically adjusted according to the relation between the number of videos and the code rate, the frame rate and the resolution. An optimal balance of available bandwidth and video quality is achieved.
By applying the technical scheme, the multi-level ip network unit is preset, the multi-level ip network unit comprises a first-level unit, a second-level unit and a third-level unit, the first-level unit is provided with a plurality of second-level units, the second-level unit is provided with a plurality of third-level units, the first-level unit and the second-level unit are communicated by adopting a first preset communication means, the second-level unit and the third-level unit are communicated by adopting a second preset communication means, the authority of the multi-level ip network unit is set, and the conference channel condition is obtained according to the authority and conference requirements; judging whether the video transmission mode is in the same channel according to the conference channel condition, and if the video transmission mode is not in the same channel, selecting the first video transmission mode to carry out video transmission; if the video is in the same channel, selecting a second video transmission mode for video transmission, and when the second video transmission mode is transmitted, predicting QoE scores of the video according to a preset QoE prediction model, and switching the second video transmission mode into the first video transmission mode or controlling video transmission basic parameters according to the QoE scores. According to the video transmission method, firstly, through setting different levels of ip units, channel conditions are determined through conference conditions, different channels and bandwidths can change, a first video transmission mode is selected for conference, namely video characteristic information is extracted, video reconstruction is carried out, and therefore video transmission is completed. In the same channel, a second video transmission mode is adopted for transmission, namely a normal transmission means is adopted, and video mode change or video transmission basic parameter change is controlled according to QoE scores. The first video transmission mode can effectively reduce the transmission code rate, reduce the bandwidth pressure and improve the definition of the figure image and the figure action precision. The adaptability of video parameters and bandwidth is improved through the control of the first video transmission mode and the second video transmission mode, so that the reliability of the video conference is improved.
From the above description of the embodiments, it will be clear to those skilled in the art that the present invention may be implemented in hardware, or may be implemented by means of software plus necessary general hardware platforms. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.), and includes several instructions for causing a computer device (may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective implementation scenario of the present invention.
In order to further explain the technical idea of the invention, the technical scheme of the invention is described with specific application scenarios.
Correspondingly, the application also provides a communication security management system of the video conference system, as shown in fig. 4, the system comprises:
the communication module 301 is configured to preset a multi-level ip network unit, where the multi-level ip network unit includes a first level unit, a second level unit and a third level unit, the first level unit is subordinate to the first level unit, the second level unit is subordinate to the second level unit, a first preset communication means is adopted to communicate between the first level unit and the second level unit, a second preset communication means is adopted to communicate between the second level unit and the third level unit, a permission of the multi-level ip network unit is set, and a conference channel condition is obtained according to the permission and a conference requirement;
The transmission module 302 is configured to determine whether the video transmission mode is in the same channel according to the conference channel condition, and if the video transmission mode is not in the same channel, select the first video transmission mode to perform video transmission;
the control module 303 is configured to, if the second video transmission mode is selected for video transmission if the second video transmission mode is in the same channel, predict QoE scores of the video according to a preset QoE prediction model, and switch the second video transmission mode to the first video transmission mode or control video transmission basic parameters according to the QoE scores.
The system also comprises:
in some embodiments of the present application, the transmission module 302 is specifically configured to:
determining a transmitting end and a receiving end in a multi-level ip network unit;
the method comprises the steps that a sending end obtains a video stream, encodes the video stream into low-code-rate information, and sends the low-code-rate information to a receiving end;
the receiving end decodes the low code rate information to reconstruct the video stream.
In some embodiments of the present application, the transmission module 302 is specifically configured to:
the video stream is composed of a plurality of sections of GOP and a plurality of sections of GOV, wherein the GOP is a group of continuous pictures, and the GOV is a group of continuous audios;
taking the first frame image of each GOP section as a reference frame, substituting the reference frame into a first preset neural network, a second preset neural network and a third preset neural network to obtain characterization information, and transmitting the characterization information to a receiving end;
Taking a frame image after the first frame image of each GOP section as a key frame, extracting head characteristic information of the key frame through a second preset neural network, and transmitting the head characteristic information to a receiving end;
the GOV is sent to the receiving end based on timing synchronization with the GOP.
In some embodiments of the present application, the transmission module 302 is specifically configured to:
the characterization information comprises general characteristic information of the reference frame, head characteristic information of the reference frame and character identity characteristic information of the reference frame;
extracting general feature information of the reference frame through a first preset neural network based on the reference frame, extracting head feature information of the reference frame through a second preset neural network based on the reference frame, extracting character identity feature information of the reference frame through a third preset neural network based on the reference frame, and transmitting the general feature information, the head feature information of the reference frame and the character identity feature information of the reference frame to a receiving end;
the low code rate information includes characterization information and header feature information of the key frame.
In some embodiments of the present application, the transmission module 302 is specifically configured to:
substituting the characterization information into a fourth preset neural network to obtain motion characteristic information, and substituting the motion characteristic information and the head characteristic information of the key frame into a fifth preset neural network to obtain a video stream.
In some embodiments of the present application, the control module 303 is configured to:
if the QoE score is larger than the first preset score value, continuing to transmit the video through the second video transmission mode;
if the QoE score is not greater than the first preset score value and the QoE score is greater than the second preset score value, controlling the video transmission basic parameters;
if the QoE score is not greater than a second preset score value, switching the second video transmission mode to the first video transmission mode;
wherein the first preset score value is greater than the second preset score value.
In some embodiments of the present application, the control module 303 is configured to:
the method comprises the steps of obtaining the number of videos in a channel, and controlling video transmission basic parameters according to the number of the videos in the channel, wherein the video transmission basic parameters comprise video code rate, video resolution and video frame rate;
when the video code rate is controlled according to the video quantity in a channel, setting the video quantity in the channel as A, presetting an array A0 (A1, A2, A3 and A4) of the video quantity in the channel, wherein the video quantity in a first preset channel is A1, the video quantity in a second preset channel is A2, the video quantity in a third preset channel is A3, the video quantity in a fourth preset channel is A4, and A1 is more than A2 and less than A3 and less than A4;
a preset video code rate array B0 (B1, B2, B3, B4), wherein the first preset video code rate is B1, the second preset video code rate is B2, the third preset video code rate is B3, the fourth preset video code rate is B4, and B1 is more than B2 and less than B3 and less than B4;
Controlling video code rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is less than or equal to A2, selecting a second preset video code rate B2 as the video code rate;
if A2 is less than or equal to A3, selecting a third preset video code rate B3 as the video code rate;
if A3 is less than or equal to A4, selecting a fourth preset video code rate B4 as the video code rate.
In some embodiments of the present application, the control module 303 is configured to:
controlling video resolution according to the number of videos in a channel;
a preset video resolution array C0 (C1, C2, C3, C4), wherein the first preset video resolution is C1, the second preset video resolution is C2, the third preset video resolution is C3, the fourth preset video resolution is C4, and C1 > C2 > C3 > C4;
controlling video resolution according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video resolution C1 as the video resolution;
if A1 is less than or equal to A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is less than or equal to A3, selecting a third preset video resolution C3 as the video resolution;
If A3 is less than or equal to A4, selecting a fourth preset video resolution C4 as the video resolution.
In some embodiments of the present application, the control module 303 is configured to: when controlling the video frame rate according to the number of videos in a channel;
a preset video frame rate array D0 (D1, D2, D3, D4), wherein the first preset video frame rate is D1, the second preset video frame rate is D2, the third preset video frame rate is D3, the fourth preset video frame rate is D4, and D1 > D2 > D3 > D4;
controlling video frame rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video frame rate D1 as the video frame rate;
if A1 is less than or equal to A2, selecting a second preset video frame rate D2 as the video frame rate;
if A2 is less than or equal to A3, selecting a third preset video frame rate D3 as the video frame rate;
if A3 is less than or equal to A4, selecting a fourth preset video frame rate D4 as the video frame rate.
Those skilled in the art will appreciate that the modules in the system in the implementation scenario may be distributed in the system in the implementation scenario according to the implementation scenario description, or that corresponding changes may be located in one or more systems different from the implementation scenario. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method for communication security management of a videoconference system, the method comprising:
the method comprises the steps of presetting a multi-level ip network unit, wherein the multi-level ip network unit comprises a first-level unit, a second-level unit and a third-level unit, the first-level unit is provided with a plurality of second-level units, the second-level unit is provided with a plurality of third-level units, the first preset communication means are adopted for communication between the first-level unit and the second-level unit, the second preset communication means are adopted for communication between the second-level unit and the third-level unit, the authority of the multi-level ip network unit is set, and the conference channel condition is obtained according to the authority and conference requirements;
judging whether the video streams are in the same channel or not according to the conference channel condition, and if the video streams are not in the same channel, selecting a first video transmission mode for video transmission, wherein the first video transmission mode is to convert the video streams into low-code-rate information between multi-level ip network units and decode the low-code-rate information to construct the video streams;
If the video transmission mode is in the same channel, selecting a second video transmission mode for video transmission, and when the video transmission mode is transmitted, predicting QoE scores of videos according to a preset QoE prediction model, and switching the second video transmission mode into a first video transmission mode or controlling video transmission basic parameters according to the QoE scores, wherein the controlling video transmission basic parameters are video code rate, video resolution and video frame rate are adjusted based on the relation correspondence between the number of videos in the channel and the number of videos in a plurality of preset channels, and the number of videos in the channel is the same number of videos in the channel.
2. The method of claim 1, wherein the first video transmission mode is:
determining a transmitting end and a receiving end in a multi-level ip network unit;
the method comprises the steps that a sending end obtains a video stream, encodes the video stream into low-code-rate information, and sends the low-code-rate information to a receiving end;
the receiving end decodes the low code rate information to reconstruct the video stream.
3. The method of claim 2, wherein the transmitting end obtains the video stream, encodes the video stream into the low code rate information, and transmits the low code rate information to the receiving end, specifically:
the video stream is composed of a plurality of sections of GOP and a plurality of sections of GOV, wherein the GOP is a group of continuous pictures, and the GOV is a group of continuous audios;
Taking the first frame image of each GOP section as a reference frame, substituting the reference frame into a first preset neural network, a second preset neural network and a third preset neural network to obtain characterization information, and transmitting the characterization information to a receiving end;
taking a frame image after the first frame image of each GOP section as a key frame, extracting head characteristic information of the key frame through a second preset neural network, and transmitting the head characteristic information to a receiving end;
the GOV is sent to the receiving end based on timing synchronization with the GOP.
4. The method of claim 3, wherein substituting the reference frame into the first preset neural network, the second preset neural network, and the third preset neural network to obtain the characterization information, and transmitting the characterization information to the receiving end, specifically:
the characterization information comprises general characteristic information of the reference frame, head characteristic information of the reference frame and character identity characteristic information of the reference frame;
extracting general feature information of the reference frame through a first preset neural network based on the reference frame, extracting head feature information of the reference frame through a second preset neural network based on the reference frame, extracting character identity feature information of the reference frame through a third preset neural network based on the reference frame, and transmitting the general feature information, the head feature information of the reference frame and the character identity feature information of the reference frame to a receiving end;
The low code rate information includes characterization information and header feature information of the key frame.
5. The method of claim 4, wherein the receiving end decodes the low code rate information to reconstruct the video stream, in particular:
substituting the characterization information into a fourth preset neural network to obtain motion characteristic information, and substituting the motion characteristic information and the head characteristic information of the key frame into a fifth preset neural network to obtain a video stream.
6. The method of claim 1, wherein the QoE score of the video is predicted according to a preset QoE prediction model, and the second video transmission mode is switched to the first video transmission mode or the control video transmission basic parameter is controlled according to the QoE score, specifically:
if the QoE score is larger than the first preset score value, continuing to transmit the video through the second video transmission mode;
if the QoE score is not greater than the first preset score value and the QoE score is greater than the second preset score value, controlling the video transmission basic parameters;
if the QoE score is not greater than a second preset score value, switching the second video transmission mode to the first video transmission mode;
wherein the first preset score value is greater than the second preset score value.
7. The method according to claim 6, wherein the control of the video basic parameters is in particular:
The method comprises the steps of obtaining the number of videos in a channel, and controlling video transmission basic parameters according to the number of the videos in the channel, wherein the video transmission basic parameters comprise video code rate, video resolution and video frame rate;
when the video code rate is controlled according to the video quantity in a channel, setting the video quantity in the channel as A, presetting an array A0 (A1, A2, A3 and A4) of the video quantity in the channel, wherein the video quantity in a first preset channel is A1, the video quantity in a second preset channel is A2, the video quantity in a third preset channel is A3, the video quantity in a fourth preset channel is A4, and A1 is more than A2 and less than A3 and less than A4;
a preset video code rate array B0 (B1, B2, B3, B4), wherein the first preset video code rate is B1, the second preset video code rate is B2, the third preset video code rate is B3, the fourth preset video code rate is B4, and B1 is more than B2 and less than B3 and less than B4;
controlling video code rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is less than or equal to A2, selecting a second preset video code rate B2 as the video code rate;
if A2 is less than or equal to A3, selecting a third preset video code rate B3 as the video code rate;
if A3 is less than or equal to A4, selecting a fourth preset video code rate B4 as the video code rate.
8. The method of claim 7, wherein in controlling the video resolution according to the number of videos in the channel;
a preset video resolution array C0 (C1, C2, C3, C4), wherein the first preset video resolution is C1, the second preset video resolution is C2, the third preset video resolution is C3, the fourth preset video resolution is C4, and C1 > C2 > C3 > C4;
controlling video resolution according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video resolution C1 as the video resolution;
if A1 is less than or equal to A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is less than or equal to A3, selecting a third preset video resolution C3 as the video resolution;
if A3 is less than or equal to A4, selecting a fourth preset video resolution C4 as the video resolution.
9. The method of claim 6, wherein when controlling the video frame rate according to the number of videos in the channel;
a preset video frame rate array D0 (D1, D2, D3, D4), wherein the first preset video frame rate is D1, the second preset video frame rate is D2, the third preset video frame rate is D3, the fourth preset video frame rate is D4, and D1 > D2 > D3 > D4;
Controlling video frame rate according to the relation between the number of channels and the number of videos in each preset channel;
if A is less than A1, selecting a first preset video frame rate D1 as the video frame rate;
if A1 is less than or equal to A2, selecting a second preset video frame rate D2 as the video frame rate;
if A2 is less than or equal to A3, selecting a third preset video frame rate D3 as the video frame rate;
if A3 is less than or equal to A4, selecting a fourth preset video frame rate D4 as the video frame rate.
10. A communication security management system for a video conferencing system, the system comprising:
the communication module is used for presetting a multi-level ip network unit, the multi-level ip network unit comprises a first-level unit, a second-level unit and a third-level unit, the first-level unit is provided with a plurality of second-level units, the second-level unit is provided with a plurality of third-level units, the first-level unit and the second-level unit are communicated by adopting a first preset communication means, the second-level unit and the third-level unit are communicated by adopting a second preset communication means, the authority of the multi-level ip network unit is set, and the conference channel condition is obtained according to the authority and conference requirements;
the transmission module is used for judging whether the video streams are in the same channel according to the conference channel condition, and selecting a first video transmission mode to carry out video transmission if the video streams are not in the same channel, wherein the first video transmission mode is to convert the video streams into low-code-rate information between the multi-level ip network units and decode the low-code-rate information to construct the video streams;
The control module is used for selecting a second video transmission mode to transmit video if the second video transmission mode is in the same channel, predicting QoE scores of the video according to a preset QoE prediction model when the second video transmission mode is transmitted, and switching the second video transmission mode into the first video transmission mode or controlling video transmission basic parameters according to the QoE scores, wherein the controlling video transmission basic parameters are video code rate, video resolution and video frame rate are adjusted based on the relation correspondence between the number of videos in the channel and the number of videos in a plurality of preset channels, and the number of videos in the channel is the number of videos in the same channel.
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