CN115720257A - Communication security management method and system of video conference system - Google Patents
Communication security management method and system of video conference system Download PDFInfo
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Abstract
The invention discloses a communication safety management method and a system of a video conference system, relating to the technical field of communication videos, wherein the method comprises the steps of presetting multistage ip network units, setting the authority of the multistage ip network units, and obtaining the conference channel condition according to the authority and conference requirements; judging whether the conference channels are in the same channel or not according to the conference channel condition, and if not, selecting a first video transmission mode to carry out video transmission; and if the video transmission mode is in the same channel, selecting a second video transmission mode for video transmission, predicting the QoE score of the video according to a preset QoE prediction model when the video is transmitted in the second video transmission mode, and switching the second video transmission mode into the first video transmission mode or controlling the video transmission basic parameters according to the QoE score. The first video transmission mode and the second video transmission mode are controlled, so that the adaptability of video parameters and bandwidth is improved, and the reliability of a video conference is improved.
Description
Technical Field
The present application 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 at two or more locations have a face-to-face conversation via a communication device and a network. Video conferences can be divided into point-to-point conferences and multipoint conferences according to different numbers of participating places. Individuals in daily life have no requirements on conversation content safety, meeting quality and meeting scale, and video software such as Tencent QQ can be adopted for video chatting. And the commercial video conference of government organs and enterprise institutions requires conditions such as stable and safe network, reliable conference quality, formal conference environment and the like, and professional video conference equipment is required to be used for establishing a special video conference system. Such video conference systems are also called video conferences and video conferences because they all use television to display. By using the video conference system, the participants can hear the sound of other meeting places, see the image, the action and the expression of the participants in other meeting places, and also can send electronic demonstration contents, so that the participants have the feeling of being personally on the scene.
In the existing video conference technology, the conference is mainly represented in two forms, one is face speech of participants and conveys conference spirit or instruction content through the speech of the participants, and the other is electronic content display such as electronic document presentation. When the electronic content is displayed and transmitted, the occupied resources are less, and the communication reliability is higher. However, when the participants speak, the resources occupied by the video are large because the real-time video is transmitted, and the communication channels between different ip levels are different, so that the bandwidth resources are different, and the requirements of video communication transmission cannot be met, so that the problems of low definition of the transmitted video, high video code rate and the like are solved, and the adaptability of the video and the channel bandwidth is poor.
Therefore, how to improve the adaptability between the video parameters and the bandwidth of the 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:
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 subordinate to the plurality of second-level units, the second-level unit is subordinate to the 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 a conference channel condition is obtained according to the authority and conference requirements;
judging whether the conference channels are in the same channel or not according to the conference channel condition, and if not, selecting a first video transmission mode to carry out video transmission;
and if the video transmission mode is in the same channel, selecting a second video transmission mode for video transmission, predicting the QoE score of the video according to a preset QoE prediction model when the video is transmitted in the second video transmission mode, and switching the second video transmission mode into the first video transmission mode or controlling the video transmission basic parameters according to the QoE score.
In some embodiments of the present application, the first video transmission mode is:
determining a sending end and a receiving end in a multi-stage ip network unit;
a sending end acquires a video stream, encodes the video stream into low-bit-rate information and sends the low-bit-rate information to a receiving end;
the receiving end decodes the low-rate information to reconstruct the video stream.
In some embodiments of the present application, a sending end obtains a video stream, encodes the video stream into low-bit-rate information, and sends the low-bit-rate information to a receiving end, specifically:
the video stream consists of a plurality of sections of GOPs (group of pictures) and a plurality of sections of GOVs (video object), wherein the GOPs are a group of continuous pictures, and the GOVs are a group of continuous audios;
taking the first frame image of each GOP 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 frame images after the first frame image of each section of GOP as key frames, extracting the head characteristic information of the key frames 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 the time sequence synchronization with the GOP.
In some embodiments of the present application, the reference frame is substituted into the first preset neural network, the second preset neural network, and the third preset neural network to obtain the characterization information, and the characterization information is transmitted to the receiving end, specifically:
the representation 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 characteristic information of the reference frame through a first preset neural network based on the reference frame, extracting head characteristic information of the reference frame through a second preset neural network based on the reference frame, extracting character identity characteristic information of the reference frame through a third preset neural network based on the reference frame, and sending the general characteristic information, the head characteristic information of the reference frame and the character identity characteristic information of the reference frame to a receiving end;
the low-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 bit rate information to reconstruct the video stream, specifically:
and substituting the representation 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 the 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 a second video transmission mode is switched to a first video transmission mode or a 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 a second video transmission mode;
if the QoE score is not larger than a first preset score value and the QoE score is larger than a second preset score value, controlling a video transmission basic parameter;
if the QoE score is not larger than a second preset score value, switching the second video transmission mode to the first video transmission mode;
wherein the first predetermined fraction value is greater than the second predetermined fraction value.
In some embodiments of the present application, the controlling video basic parameters specifically include:
acquiring the quantity of videos in a channel, and controlling basic video transmission parameters according to the quantity of the videos in the channel, wherein the basic video transmission parameters comprise video code rate, video resolution and video frame rate;
when controlling the video code rate according to the video data quantity in the channel, setting the video quantity in the channel as A, and presetting a video quantity array A0 (A1, A2, A3, A4) in the channel, wherein the video quantity in the first preset channel is A1, the video quantity in the second preset channel is A2, the video quantity in the third preset channel is A3, the video quantity in the fourth preset channel is A4, and A1 is more than A2 and more 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 greater than B2 and greater than B3 and less than B4;
controlling the video code rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is not less than A and less than A2, selecting a second preset video code rate B2 as a video code rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video code rate B3 as a video code rate;
and if A3 is more than or equal to A and less than 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 an intra-channel video amount;
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 the video resolution according to the relation between the number in the channel 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 more than or equal to A and less than A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is more than or equal to A and less than A3, selecting a third preset video resolution C3 as the video resolution;
and if A3 is more than or equal to A and less than 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 video data amount in the channel;
the method comprises the steps that a preset video frame rate array D0 (D1, D2, D3 and D4) is provided, 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 is larger than D2 and larger than D3 and larger than D4;
controlling the video frame rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video frame rate D1 as a video frame rate;
if A1 is more than or equal to A and less than A2, selecting a second preset video frame rate D2 as a video frame rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video frame rate D3 as a video frame rate;
and if A3 is more than or equal to A and less than A4, selecting a fourth preset video frame rate D4 as the video frame rate.
Correspondingly, the present application also provides a communication security management system of a video conference system, the system including:
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 subordinate to a plurality of second-level units, the second-level unit is subordinate to 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 the conference requirement;
the transmission module is used for judging whether the conference channels are in the same channel or not according to the conference channel condition, and if not, selecting a first video transmission mode to carry out video transmission;
and the control module is used for selecting a second video transmission mode for video transmission if the second video transmission mode is in the same channel, predicting the QoE score 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 the basic parameters of video transmission according to the QoE score.
By applying the technical scheme, a multi-level ip network unit is preset and comprises a first-level unit, a second-level unit and a third-level unit, wherein the first-level unit is subordinate to the plurality of second-level units, the second-level unit is subordinate to the 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 the conference requirement; judging whether the conference channels are in the same channel or not according to the conference channel condition, and if not, selecting a first video transmission mode to carry out video transmission; and if the video transmission mode is in the same channel, selecting a second video transmission mode for video transmission, predicting the QoE score of the video according to a preset QoE prediction model when the video is transmitted in the second video transmission mode, and switching the second video transmission mode into the first video transmission mode or controlling the basic parameters of the video transmission according to the QoE score. According to the method, the channel condition is determined through the conference condition by setting the ip units at different levels, the bandwidth can be changed through different channels, the first video transmission mode is selected for the conference, namely, the video characteristic information is extracted, and then the video is reconstructed, so that the 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 the change of the video mode or the change of the basic parameters of video transmission is controlled according to the QoE score. The first video transmission mode can effectively reduce transmission code rate, reduce bandwidth pressure and improve figure image definition and figure action precision. By the first video transmission mode and the control of the second video transmission mode, the adaptability of video parameters and bandwidth is improved, and the reliability of a video conference is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 illustrates a schematic structural diagram of multiple levels of 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 flowchart illustrating a communication security management method of a video conference system according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating video transmission in a first video transmission mode according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating a communication security management system of a video conference system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides a communication security management method for a video conference system, as shown in fig. 2, the method includes the following steps:
and 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 subordinate to the plurality of second-level units, the second-level unit is subordinate to the 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 the conference requirement.
As shown in fig. 1, in the present embodiment, in order to satisfy complex conference traffic, multiple levels of ip network elements are set in advance. The first preset communication means comprises an optical fiber and a satellite, namely, the optical fiber and the satellite are adopted for communication between the primary unit and the secondary unit, and wired and wireless mutual backup is realized. The third-level unit is a maneuvering unit and adopts different communication means according to the distance between the third-level unit and the second-level unit. The second preset communication means comprises optical fibers, satellites, scattering and the like, namely, the secondary unit and the tertiary unit are communicated by one or more means of the optical fibers, the satellites, the scattering and the like, and all the means are mutually backed up. Because different communication means have larger difference in the aspects of networking, bandwidth, time delay and the like, the network environment is more complex, and different video transmission modes are required to improve the adaptability.
And setting the authority of each level of network unit 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 all the conferences participated by the subordinate second-level and third-level units, and is a large conference;
2. the first-level unit organizes the conference in which only the subordinate second-level unit participates, and the conference is a multi-unit conference;
3. the first-level unit organizes the conference in which only the subordinate third-level units participate, and the conference is a cross-level conference;
4. the second-level unit independently organizes the conference of the subordinate third-level unit as a subordinate conference.
It is to be understood that the primary, secondary, and tertiary units described above correspond to different units, mechanisms, organizational structures, etc. Each level unit can also organize the conference with each level unit, and the conference generally adopts the same communication means and the same channel. And obtaining the conference channel condition according to the authority and the specific conference requirement.
And step S102, judging whether the conference channels are in the same channel or not according to the conference channel condition, and selecting a first video transmission mode to carry out video transmission if the conference channels are not in the same channel.
In this embodiment, whether the same channel is used for the video conference is determined according to the conference channel conditions, and different video transmission modes are used according to different channel conditions. If the data difference such as the bandwidth is larger than the data difference of the data in the same channel, the first video transmission mode is selected for video transmission. The first video transmission mode, i.e., the video stream (image stream), is encoded and converted into low-bit-rate information, and the receiving end decodes the low-bit-rate information to restore the original video (original image).
For example, the same video source is watched among units with different channels, optical fiber communication is adopted between the primary unit and the secondary unit, the video watched by the secondary unit is high-definition video, and satellite and scattering communication is adopted between the secondary unit and the tertiary unit, so that in the normal situation, when the tertiary unit watches the video of the primary unit, parameters such as video image quality and the like need to be reduced for watching, such as standard definition 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 sending end and a receiving end in a multi-stage ip network unit;
step S202, a sending end obtains a video stream, encodes the video stream into low-bit-rate information, and sends the low-bit-rate information to a receiving end;
in step S203, the receiving end decodes the low bit rate information to reconstruct the video stream.
In this embodiment, it is determined who is the sending end and who is the receiving end in the three level units. The method for encoding the video stream into the low bit rate information by the sending end comprises two parts, wherein one part is used for acquiring the characteristic information (characteristic information) of the reference frame, and the other part is used for acquiring the characteristic information (head characteristic information) of the key frame. And the receiving end processes the representation 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 one frame are presented according to a time sequence. However, in practical applications, not every frame is a complete picture, because if every frame is a complete picture, the volume of a video is large. This is too costly for network transmission or video data storage, so a part of the pictures in the video stream is usually compressed (encoded). The encoder encodes a plurality of Pictures to produce a section of GOP (Group of Pictures). The audio Group is GOV (Group of Voice).
In order to further improve the reliability of video transmission, in some embodiments of the present application, a sending end obtains a video stream, encodes the video stream into low-bit-rate information, and sends the low-bit-rate information to a receiving end, specifically: the video stream consists of a plurality of sections of GOPs (group of pictures) and a plurality of sections of GOVs (group of videos), wherein the GOPs are a group of continuous pictures, and the GOVs are a group of continuous audios; taking the first frame image of each GOP 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 frame images after the first frame image of each section of GOP as key frames, extracting the head characteristic information of the key frames 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 the time sequence 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 directional features. The second preset neural network is used for acquiring the head feature information of the person in the reference frame, wherein the head feature information comprises posture 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 the frames except the first frame in the GOP as key frames, and extracting the head characteristic information of the key frames. The audio group GOV is sent to the receiving end with the time synchronization of the GOP frames.
In order to improve the 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, specifically: the representation 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 characteristic information of the reference frame through a first preset neural network based on the reference frame, extracting head characteristic information of the reference frame through a second preset neural network based on the reference frame, extracting character identity characteristic information of the reference frame through a third preset neural network based on the reference frame, and sending the general characteristic information, the head characteristic information of the reference frame and the character identity characteristic information of the reference frame to a receiving end; the low-rate information includes characterization information and header feature information of the key frame.
In order to further improve the accuracy of feature extraction, in some embodiments of the present application, a receiving end decodes low-bit-rate information to reconstruct a video stream, specifically: and substituting the representation 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 the video stream.
In this embodiment, the fourth preset neural network is used to predict motion feature information before features extracted from the reference frame and features transmitted from the key frame, so as to improve the generation effect of the picture. And 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.
And step S103, if the video transmission modes are in the same channel, selecting a second video transmission mode to carry out video transmission, predicting a QoE score of the video according to a preset QoE prediction model when the video is transmitted in the second video transmission mode, and switching the second video transmission mode into the first video transmission mode or controlling basic parameters of the video transmission according to the QoE score.
In this embodiment, the conference is in the same channel, the data such as bandwidth and the like basically has no change, and a conventional video transmission mode (a sending end sends video and audio codes to a receiving end and decodes the video and audio codes) is adopted, that is, the second video transmission mode. In the process, a QoE prediction model is adopted to predict the QoE score of the video, and if the QoE score is too low, 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 within an acceptable range, and only the basic parameters of video transmission 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 resource of the satellite is limited, and at this time, a shared channel mode is generally adopted, so that better communication service is realized. Therefore, the quantity of the 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 quantity. The channel bandwidth is reasonably utilized, and the optimal balance of available bandwidth and video quality is realized.
Conventional methods for evaluating the Quality of Service of a network application usually focus on network-level parameters such as bandwidth, packet loss, delay, jitter, etc., which are called QoS (Quality of Service) parameters. However, for some applications, especially video applications, the QoS parameter only describes the data transmission situation of the network, and cannot directly reflect the experience of the user of the application program. The concept of QoE (Quality of Experience) is thus introduced to represent the overall Experience of a person for a web application.
And (3) presetting a QoE prediction model process: a Pseudo-Subjective evaluation algorithm (PSQA) is used to build the model. An application scene is first defined in PSQA, and the scene includes some characteristics of the video application and its operating environment, such as video resolution, encoding algorithm, video type, etc. In this context, a set of factors is defined that have an impact on the QoE of a video application, and these factors are typically a set of network or application parameters that can be measured, such as bitrate, frame rate, packet loss rate, etc. of the video. This is called the quality impact factor (QAF). And then establishing a distorted video database, wherein each distorted video corresponds to a QAF influence factor vector, and evaluating the user experience quality of the distorted videos by adopting a subjective testing method. And establishing a prediction model according to the subjective test data, wherein the model can evaluate the QoE score of the video according to the influence factor vector. A higher score indicates better video viewing quality.
In order to improve the 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 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 a second video transmission mode; if the QoE score is not larger than a first preset score value and the QoE score is larger than a second preset score value, controlling a video transmission basic parameter; if the QoE score is not larger than a second preset score value, switching the second video transmission mode to the first video transmission mode; wherein the first predetermined fractional value is greater than the second predetermined fractional value.
In this embodiment, if the QoE score is greater than the first preset score value, which indicates that the video transmission quality is better, the 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 basic parameters of video transmission can be controlled. If the QoE score is not greater than the second preset score value, which indicates that the video transmission quality is very poor, the video transmission mode needs to be changed, and the second video transmission mode is switched to the first video transmission mode.
In order to improve the accuracy of controlling the video basic parameters, in some embodiments of the present application, controlling the video basic parameters specifically includes:
acquiring the quantity of videos in a channel, and controlling basic video transmission parameters according to the quantity of the videos in the channel, wherein the basic video transmission parameters comprise video code rate, video resolution and video frame rate;
when controlling the video code rate according to the video data quantity in the channel, setting the video quantity in the channel as A, and presetting a video quantity array A0 (A1, A2, A3, A4) in the channel, wherein the video quantity in the first preset channel is A1, the video quantity in the second preset channel is A2, the video quantity in the third preset channel is A3, the video quantity in the fourth preset channel is A4, and A1 is more than A2 and more 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 greater than B2 and greater than B3 and less than B4;
controlling the video code rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is more than or equal to A and less than A2, selecting a second preset video code rate B2 as a video code rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video code rate B3 as a video code rate;
and if A3 is more than or equal to A and less than 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 intra-channel video data amount;
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 the video resolution according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video resolution C1 as the video resolution;
if A1 is more than or equal to A and less than A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is more than or equal to A and less than A3, selecting a third preset video resolution C3 as the video resolution;
and if A3 is more than or equal to A and less than 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 video data amount in the channel;
the method comprises the steps that a preset video frame rate array D0 (D1, D2, D3 and D4) is formed, 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 is larger than D2 and larger than D3 and larger than D4;
controlling the video frame rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video frame rate D1 as a video frame rate;
if A1 is more than or equal to A and less than A2, selecting a second preset video frame rate D2 as a video frame rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video frame rate D3 as the video frame rate;
and if A3 is more than or equal to A and less than A4, selecting a fourth preset video frame rate D4 as the video frame rate.
In this embodiment, the basic parameters of video transmission are controlled according to the number of videos transmitted in a channel, and the code rate, the frame rate, and the resolution of each path of video are dynamically adjusted according to the relationship 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, a multi-level ip network unit is preset and comprises a first-level unit, a second-level unit and a third-level unit, wherein the first-level unit is subordinate to the plurality of second-level units, the second-level unit is subordinate to the 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 the conference requirement; judging whether the conference channels are in the same channel or not according to the conference channel condition, and if not, selecting a first video transmission mode to carry out video transmission; and if the video transmission mode is in the same channel, selecting a second video transmission mode for video transmission, predicting the QoE score of the video according to a preset QoE prediction model when the video is transmitted in the second video transmission mode, and switching the second video transmission mode into the first video transmission mode or controlling the basic parameters of the video transmission according to the QoE score. According to the method, the channel condition is determined through the conference condition by setting the ip units at different levels, the bandwidth can be changed through different channels, the first video transmission mode is selected for the conference, namely, the video characteristic information is extracted, and then the video is reconstructed, so that the 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 the change of the video mode or the change of the basic parameters of video transmission is controlled according to the QoE score. The first video transmission mode can effectively reduce transmission code rate, reduce bandwidth pressure and improve figure image definition and figure action precision. The first video transmission mode and the second video transmission mode are controlled, so that the adaptability of video parameters and bandwidth is improved, and the reliability of a video conference is improved.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method according to the implementation scenarios of the present invention.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
Correspondingly, the present application further provides a communication security management system of a video conference system, as shown in fig. 4, the system includes:
the communication module 301 is used for 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 subordinate to the plurality of second-level units, the second-level unit is subordinate to the 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 a conference channel condition is obtained according to the authority and conference requirements;
the transmission module 302 is configured to determine whether the conference channels are located in the same channel according to the conference channel condition, and select a first video transmission mode to perform video transmission if the conference channels are not located in the same channel;
the control module 303 is configured to select a second video transmission mode for video transmission if the second video transmission mode is in the same channel, predict a QoE score of the video according to a preset QoE prediction model when the second video transmission mode is transmitted, and switch the second video transmission mode to the first video transmission mode or control a basic video transmission parameter according to the QoE score.
The system also comprises:
in some embodiments of the present application, the transmission module 302 is specifically configured to:
determining a sending end and a receiving end in a multi-stage ip network unit;
a sending end acquires a video stream, encodes the video stream into low-bit-rate information and sends the low-bit-rate information to a receiving end;
the receiving end decodes the low-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 consists of a plurality of sections of GOPs (group of pictures) and a plurality of sections of GOVs (group of videos), wherein the GOPs are a group of continuous pictures, and the GOVs are a group of continuous audios;
taking the first frame image of each GOP 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 frame images after the first frame image of each section of GOP as key frames, extracting head characteristic information of the key frames through a second preset neural network, and transmitting the head characteristic information to a receiving end;
the GOV is sent to a receiving end based on the time sequence synchronization with the GOP.
In some embodiments of the present application, the transmission module 302 is specifically configured to:
the representation 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 characteristic information of the reference frame through a first preset neural network based on the reference frame, extracting head characteristic information of the reference frame through a second preset neural network based on the reference frame, extracting character identity characteristic information of the reference frame through a third preset neural network based on the reference frame, and sending the general characteristic information, the head characteristic information of the reference frame and the character identity characteristic information of the reference frame to a receiving end;
the low-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:
and substituting the representation 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 the 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, video transmission is continuously carried out through a second video transmission mode;
if the QoE score is not larger than a first preset score value and the QoE score is larger than a second preset score value, controlling basic parameters of video transmission;
if the QoE score is not larger than a second preset score value, switching the second video transmission mode to the first video transmission mode;
wherein the first predetermined fraction value is greater than the second predetermined fraction value.
In some embodiments of the present application, the control module 303 is configured to:
acquiring the quantity of videos in a channel, and controlling basic video transmission parameters according to the quantity of the videos in the channel, wherein the basic video transmission parameters comprise a video code rate, a video resolution and a video frame rate;
when controlling the video code rate according to the video data quantity in the channel, setting the video quantity in the channel as A, and presetting a video quantity array A0 (A1, A2, A3, A4) in the channel, wherein the video quantity in the first preset channel is A1, the video quantity in the second preset channel is A2, the video quantity in the third preset channel is A3, the video quantity in the fourth preset channel is A4, and A1 is more than A2 and more 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 greater than B2 and greater than B3 and less than B4;
controlling the video code rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is more than or equal to A and less than A2, selecting a second preset video code rate B2 as a video code rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video code rate B3 as a video code rate;
and if A3 is more than or equal to A and less than 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:
when controlling the video resolution according to the video data amount 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 the video resolution according to the relation between the number in the channel 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 more than or equal to A and less than A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is more than or equal to A and less than A3, selecting a third preset video resolution C3 as the video resolution;
and if A3 is more than or equal to A and less than 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 video frequency quantity in the channel;
the method comprises the steps that a preset video frame rate array D0 (D1, D2, D3 and D4) is provided, 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 is larger than D2 and larger than D3 and larger than D4;
controlling the video frame rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video frame rate D1 as a video frame rate;
if A1 is more than or equal to A and less than A2, selecting a second preset video frame rate D2 as a video frame rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video frame rate D3 as a video frame rate;
and if A3 is more than or equal to A and less than 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 implementing the scenario may be distributed in the system implementing the scenario according to the description of the implementation scenario, or may be correspondingly changed in one or more systems different from the present 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 used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A communication security management method of a video conference system, the method comprising:
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 subordinate to the plurality of second-level units, the second-level unit is subordinate to the 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 a conference channel condition is obtained according to the authority and conference requirements;
judging whether the conference channels are in the same channel or not according to the conference channel condition, and if not, selecting a first video transmission mode to carry out video transmission;
and if the video transmission mode is in the same channel, selecting a second video transmission mode for video transmission, predicting the QoE score of the video according to a preset QoE prediction model when the video is transmitted in the second video transmission mode, and switching the second video transmission mode into the first video transmission mode or controlling the basic parameters of the video transmission according to the QoE score.
2. The method of claim 1, wherein the first video transmission mode is:
determining a sending end and a receiving end in a multi-stage ip network unit;
a sending end acquires a video stream, codes the video stream into low-bit-rate information and sends the low-bit-rate information to a receiving end;
the receiving end decodes the low-rate information to reconstruct the video stream.
3. The method of claim 2, wherein the sending end obtains a video stream, encodes the video stream into low bit rate information, and sends the low bit rate information to the receiving end, and the method specifically comprises:
the video stream consists of a plurality of sections of GOPs (group of pictures) and a plurality of sections of GOVs (group of videos), wherein the GOPs are a group of continuous pictures, and the GOVs are a group of continuous audios;
taking the first frame image of each GOP 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 frame images after the first frame image of each section of GOP as key frames, extracting the head characteristic information of the key frames through a second preset neural network, and transmitting the head characteristic information to a receiving end;
the GOV is sent to a receiving end based on the time sequence synchronization with the GOP.
4. The method of claim 3, wherein the step of 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 comprises:
the representation 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 characteristic information of the reference frame through a first preset neural network based on the reference frame, extracting head characteristic information of the reference frame through a second preset neural network based on the reference frame, extracting character identity characteristic information of the reference frame through a third preset neural network based on the reference frame, and sending the general characteristic information, the head characteristic information of the reference frame and the character identity characteristic information of the reference frame to a receiving end;
the low-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 rate information to reconstruct the video stream, specifically:
and substituting the representation 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 the 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 switching of the second video transmission mode to the first video transmission mode or the controlling of the video transmission basic parameters according to the QoE score is specifically performed by:
if the QoE score is larger than the first preset score value, continuing to transmit the video through a second video transmission mode;
if the QoE score is not larger than a first preset score value and the QoE score is larger than a second preset score value, controlling a video transmission basic parameter;
if the QoE score is not larger than a second preset score value, switching the second video transmission mode to the first video transmission mode;
wherein the first predetermined fraction value is greater than the second predetermined fraction value.
7. The method of claim 6, wherein the controlling the video basic parameters comprises:
acquiring the quantity of videos in a channel, and controlling basic video transmission parameters according to the quantity of the videos in the channel, wherein the basic video transmission parameters comprise video code rate, video resolution and video frame rate;
when controlling the video code rate according to the video data quantity in the channel, setting the video quantity in the channel as A, and presetting a video quantity array A0 (A1, A2, A3, A4) in the channel, wherein the video quantity in the first preset channel is A1, the video quantity in the second preset channel is A2, the video quantity in the third preset channel is A3, the video quantity in the fourth preset channel is A4, and A1 is more than A2 and more 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 greater than B2 and greater than B3 and less than B4;
controlling the video code rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video code rate B1 as a video code rate;
if A1 is not less than A and less than A2, selecting a second preset video code rate B2 as a video code rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video code rate B3 as a video code rate;
and if A3 is more than or equal to A and less than A4, selecting a fourth preset video code rate B4 as the video code rate.
8. The method of claim 7, wherein in controlling video resolution according to intra-channel video data amount;
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 the video resolution according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video resolution C1 as the video resolution;
if A1 is more than or equal to A and less than A2, selecting a second preset video resolution C2 as the video resolution;
if A2 is more than or equal to A and less than A3, selecting a third preset video resolution C3 as the video resolution;
and if A3 is more than or equal to A and less than A4, selecting a fourth preset video resolution C4 as the video resolution.
9. The method of claim 6, wherein when controlling a video frame rate according to an intra-channel video amount;
the method comprises the steps that a preset video frame rate array D0 (D1, D2, D3 and D4) is provided, 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 is larger than D2 and larger than D3 and larger than D4;
controlling the video frame rate according to the relation between the number in the channel and the number of videos in each preset channel;
if A is smaller than A1, selecting a first preset video frame rate D1 as a video frame rate;
if A1 is more than or equal to A and less than A2, selecting a second preset video frame rate D2 as a video frame rate;
if A2 is more than or equal to A and less than A3, selecting a third preset video frame rate D3 as a video frame rate;
and if A3 is more than or equal to A and less than A4, selecting a fourth preset video frame rate D4 as the video frame rate.
10. A communication security management system of a video conference 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 subordinate to the plurality of second-level units, the second-level unit is subordinate to the 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 a conference channel condition is obtained according to the authority and conference requirements;
the transmission module is used for judging whether the conference channels are in the same channel or not according to the conference channel condition, and if not, selecting a first video transmission mode to carry out video transmission;
and the control module is used for selecting a second video transmission mode for video transmission if the second video transmission mode is positioned in the same channel, predicting the QoE score 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 the basic parameters of the video transmission according to the QoE score.
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