CN110611789A - Video streaming transmission control method and device, electronic equipment and storage medium - Google Patents
Video streaming transmission control method and device, electronic equipment and storage medium Download PDFInfo
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- CN110611789A CN110611789A CN201810614847.7A CN201810614847A CN110611789A CN 110611789 A CN110611789 A CN 110611789A CN 201810614847 A CN201810614847 A CN 201810614847A CN 110611789 A CN110611789 A CN 110611789A
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- video stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/637—Control signals issued by the client directed to the server or network components
- H04N21/6373—Control signals issued by the client directed to the server or network components for rate control, e.g. request to the server to modify its transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
Abstract
The application provides a video streaming control method, a video streaming control device, an electronic device and a storage medium, wherein the method comprises the following steps: receiving a stream switching instruction sent by a client, wherein the stream switching instruction carries a video stream receiving rate sampling result; and when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream, reducing the code rate of the current video stream, and transmitting the video stream to the client according to the reduced code rate. The method can optimize the video preview and playback effects of the client.
Description
Technical Field
The present disclosure relates to video monitoring technologies, and in particular, to a method and an apparatus for controlling video stream transmission, an electronic device, and a storage medium.
Background
With the rapid development of communication technology and monitoring technology, video monitoring is more and more widely applied.
In a video monitoring system, when a user needs to preview or playback a monitored video, a video preview or playback request may be sent to a video source device through a video stream request client (herein, simply referred to as a client), and the video source device sends a video stream to the client for preview or playback.
However, practice finds that during video preview or playback, when the network state is poor, the fluency of video playing may be affected.
Disclosure of Invention
In view of the above, the present application provides a video streaming control method, an apparatus, an electronic device, and a storage medium.
Specifically, the method is realized through the following technical scheme:
according to a first aspect of embodiments of the present application, there is provided a video streaming control method applied to a video source device in a video monitoring system, the method including:
receiving a stream switching instruction sent by a client, wherein the stream switching instruction carries a video stream receiving rate sampling result;
and when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream, reducing the code rate of the current video stream, and transmitting the video stream to the client according to the reduced code rate.
Optionally, a plurality of video stream transmission channels exist between the video source device and the client; the stream switching instruction carries video stream receiving rate sampling results corresponding to all channels;
when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream, reducing the code rate of the current video stream, including:
for any channel, when the receiving rate sampling result of the video stream corresponding to the channel does not meet the rate requirement corresponding to the code rate of the video stream transmitted in the channel, the code rate of the video stream transmitted in the channel is reduced.
Optionally, before reducing the bitrate of the video stream transmitted in the channel, the method further includes:
judging whether the code rate of the video stream transmitted in the channel is the lowest code rate or not;
if yes, the code rate of the video stream transmitted in the channel is kept;
otherwise, determining to perform the reducing of the bitrate of the video stream transmitted in the channel.
Optionally, the method further includes:
for any channel, when the receiving rate sampling result of the video stream corresponding to the channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel, judging whether the code rate of the video stream transmitted in the channel is the highest code rate;
if yes, the code rate of the video stream transmitted in the channel is kept;
otherwise, the code rate of the video stream transmitted in the channel is increased, and the video stream is transmitted to the client according to the increased code rate.
Optionally, the stream switching instruction further carries a client configuration parameter, where the client configuration parameter includes the number of video streams with different code rates supported by the client;
the improving the code rate of the video stream transmitted in the channel includes:
judging whether the number of the video streams with various code rates between the video source equipment and the client meets the requirement that the client supports the number of the video streams with different code rates after the code rate of the video stream transmitted in the channel is increased to a target code rate;
and if so, increasing the code rate of the video stream transmitted in the channel to the target code rate.
Optionally, after reducing the bitrate of the current video stream, the method further includes:
and sending a code rate adjustment notification message to the client.
According to a second aspect of the embodiments of the present application, there is provided a video streaming control method applied to a client in a video surveillance system, the method including:
carrying out receiving rate sampling on a received video stream transmitted by video source equipment to obtain a video stream receiving rate sampling result;
and sending a stream switching instruction to the video source equipment, wherein the stream switching instruction carries the video stream receiving rate sampling result.
Optionally, a plurality of video stream transmission channels exist between the video source device and the client;
the receiving rate sampling of the received video stream transmitted by the video source device comprises:
and respectively carrying out receiving rate sampling on the video streams transmitted in the channels to obtain the video stream receiving rate sampling results corresponding to the channels.
According to a third aspect of the embodiments of the present application, there is provided a video streaming control apparatus applied to a video source device in a video monitoring system, the apparatus comprising:
the receiving unit is used for receiving a stream switching instruction sent by a client, wherein the stream switching instruction carries a video stream receiving rate sampling result;
the judging unit is used for judging whether the video stream receiving rate sampling result meets the rate requirement corresponding to the code rate of the current video stream;
the control unit is used for reducing the code rate of the current video stream when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream;
and the sending unit is used for carrying out video stream transmission to the client according to the reduced code rate.
Optionally, a plurality of video stream transmission channels exist between the video source device and the client; the stream switching instruction carries video stream receiving rate sampling results corresponding to all channels;
the determining unit is specifically configured to determine, for any channel, whether a video stream receiving rate sampling result corresponding to the channel meets a rate requirement corresponding to a code rate of a video stream transmitted in the channel;
the control unit is specifically configured to, for any channel, reduce a bitrate of a video stream transmitted in the channel when a video stream receiving rate sampling result corresponding to the channel does not meet a rate requirement corresponding to the bitrate of the video stream transmitted in the channel.
Optionally, the determining unit is further configured to determine whether the code rate of the video stream transmitted in the channel is the lowest code rate when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream;
the control unit is further configured to maintain the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is the lowest bitrate;
the control unit is further specifically configured to reduce the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is not the lowest bitrate.
Optionally, the determining unit is further configured to, for any channel, determine whether the code rate of the video stream transmitted in the channel is the highest code rate when the video stream receiving rate sampling result corresponding to the channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel;
the control unit is further configured to maintain the bitrate of the video stream transmitted in the channel when whether the bitrate of the video stream transmitted in the channel is the highest bitrate;
the control unit is further configured to increase the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is not the highest bitrate;
and the sending unit is also used for carrying out video stream transmission to the client according to the improved code rate.
Optionally, the stream switching instruction further carries a client configuration parameter, where the client configuration parameter includes the number of video streams with different code rates supported by the client;
the determining unit is further configured to determine whether the number of the video streams with different code rates between the video source device and the client meets a requirement that the client supports the number of the video streams with different code rates after the code rate of the video stream transmitted in the channel is increased to a target code rate;
the control unit is specifically configured to increase the code rate of the video stream transmitted in the channel to the target code rate when the number of the video streams with different code rates between the video source device and the client meets the requirement that the client supports the number of the video streams with different code rates after increasing the code rate of the video stream transmitted in the channel to the target code rate.
Optionally, the sending unit is further configured to send a rate adjustment notification message to the client.
According to a fourth aspect of the embodiments of the present application, there is provided an electronic device, including a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus;
a memory for storing a computer program;
and a processor, configured to implement the steps of the video streaming control method according to the first aspect when executing the program stored in the memory.
According to a fifth aspect of embodiments of the present application, a computer-readable storage medium is provided, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the video streaming control method provided by the first aspect.
According to a sixth aspect of the embodiments of the present application, there is provided a video streaming control apparatus applied to a client in a video surveillance system, the apparatus including:
the receiving unit is used for receiving a video stream transmitted by the video source equipment;
the sampling unit is used for sampling the receiving rate of the video stream transmitted by the video source equipment received by the receiving unit to obtain a video stream receiving rate sampling result;
and the sending unit is used for sending a stream switching instruction to the video source equipment, wherein the stream switching instruction carries the video stream receiving rate sampling result.
Optionally, a plurality of video stream transmission channels exist between the video source device and the client;
the sampling unit is specifically configured to perform receiving rate sampling on the video streams transmitted in the channels respectively to obtain video stream receiving rate sampling results corresponding to the channels.
According to a seventh aspect of the embodiments of the present application, there is provided an electronic device, including a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus;
a memory for storing a computer program;
and the processor is used for realizing the steps of the video stream transmission control method provided by the second aspect when executing the program stored in the memory.
According to an eighth aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored therein a computer program, which when executed by a processor, implements the steps of the video streaming control method provided by the second aspect described above.
According to the video stream transmission control method, a client carries out receiving rate sampling on a received video stream transmitted by video source equipment, and sends the obtained receiving rate sampling result of the video stream to the video source equipment; when the video source equipment determines that the video stream receiving rate sampling result of the client does not meet the rate requirement corresponding to the code rate of the current video stream, the code rate of the current video stream is reduced, and video stream transmission is carried out on the client according to the reduced code rate, so that the video playing fluency of the client is ensured, and the video preview and playback effect of the client is optimized.
Drawings
Fig. 1 is a schematic flow chart diagram illustrating a video streaming control method according to an exemplary embodiment of the present application;
fig. 2 is a schematic flow chart diagram illustrating a video streaming control method according to an exemplary embodiment of the present application;
FIG. 3 is an architectural diagram illustrating a specific application scenario according to an exemplary embodiment of the present application;
FIG. 4 is a diagram illustrating a dynamic window sampling in accordance with an exemplary embodiment of the present application;
FIG. 5 is a diagram illustrating bitrate adjustment of a video stream according to an exemplary embodiment of the present application;
fig. 6 is a schematic structural diagram of a video streaming control apparatus according to an exemplary embodiment of the present application;
FIG. 7 is a diagram illustrating a hardware configuration of an electronic device according to an exemplary embodiment of the present application;
fig. 8 is a schematic structural diagram of a video streaming control apparatus according to an exemplary embodiment of the present application;
fig. 9 is a schematic diagram of a hardware structure of an electronic device according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In order to make the technical solutions provided in the embodiments of the present application better understood and make the above objects, features and advantages of the embodiments of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a schematic flow chart of a video streaming control method provided in an embodiment of the present application is shown, where the video streaming control method may be applied to a client in a video monitoring system, and as shown in fig. 1, the video streaming control method may include the following steps:
it should be noted that the client may include, but is not limited to, a Web client (requesting a video stream through a browser), a PC (Personal Computer) client (requesting a video stream through a specific application installed in a PC), or a mobile client (requesting a video stream through a specific application installed in a mobile terminal (e.g., a mobile phone)), and the like, and the description of the embodiment of the present application will not be repeated later.
Step S100, carrying out receiving rate sampling on the received video stream transmitted by the video source equipment to obtain a video stream receiving rate sampling result.
In the embodiment of the application, when the monitoring video needs to be previewed or played back, the client may send a video preview or playback request to the video source device, and the video source device sends a video stream to the client for previewing or playing back.
In consideration of network instability, in the transmission process of a video stream, the smoothness of video playing of a client may be deteriorated due to the deterioration of a network state, so that in order to improve the video playing effect, the client can monitor the network performance and the video stream transmission performance, notify a video source device of the monitoring result, and perform code rate adjustment by the video source device according to the monitoring result, so that the code rate of the video stream is more matched with the network performance.
It should be noted that, in the embodiment of the present application, the Video source device may include, but is not limited to, a Video capture device (such as an IPC (Internet Protocol Camera)) or a Video storage device (such as an NVR (network Video Recorder) or a DVR (Digital Video Recorder)), and the embodiment of the present application will not be described again in the following.
Accordingly, in the embodiment of the present application, the client may perform receiving rate sampling on the received video stream transmitted by the video source device to obtain a video stream receiving rate sampling result.
For example, the client may perform receiving rate sampling on a received video stream transmitted from a video source device by using a dynamic window sampling method.
In one embodiment of the present application, when there are multiple video stream transmission channels between a video source device and a client, the above sampling a receiving rate of a received video stream transmitted by the video source device may include:
and respectively carrying out receiving rate sampling on the video streams transmitted in the channels to obtain the video stream receiving rate sampling results corresponding to the channels.
In this embodiment, the client may request the video source device for previewing or playing back the multiple video streams, at this time, the video source device may transmit the multiple video streams to the client through the multiple video stream transmission channels; wherein, a video stream transmission channel corresponds to a video stream.
In this case, the client may perform receiving rate sampling on the video streams transmitted in the channels respectively to obtain a video stream receiving rate sampling result corresponding to each channel.
Step S110, sending a stream switching instruction to the video source equipment, wherein the stream switching instruction carries a video stream receiving rate sampling result.
In the embodiment of the application, after the client obtains the video stream receiving rate sampling result, the video stream receiving rate sampling result can be sent to the video source device through the stream switching instruction.
When a plurality of video stream transmission channels exist between a video source and a client, the client can send video stream receiving rate sampling results corresponding to the channels to video source equipment through a stream switching instruction.
In the embodiment of the present application, reference may be made to relevant description in the method flow shown in fig. 2 for a processing flow when the video source device receives the stream switching instruction, and details of the embodiment of the present application are not repeated herein.
Referring to fig. 2, a schematic flow chart of a video streaming control method according to an embodiment of the present disclosure is shown, where the video streaming control method can be applied to a video source device in a video monitoring system, and as shown in fig. 2, the video streaming control method can include the following steps:
step S200, receiving a stream switching instruction sent by a client, wherein the stream switching instruction carries a video stream receiving rate sampling result.
In the embodiment of the present application, specific implementation of sending the stream switching instruction to the video source device by the client may refer to related description in the method flow shown in fig. 1, and details of the embodiment of the present application are not described herein again.
And step S210, when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream, reducing the code rate of the current video stream, and transmitting the video stream to the client according to the reduced code rate.
In the embodiment of the application, when the video source device receives a stream switching instruction sent by a client, the video source device can obtain a video stream receiving sampling result carried in the stream switching instruction, and judge whether the video stream receiving rate sampling result meets a rate requirement corresponding to the code rate of the current video stream.
In order to ensure the fluency of video playing of the client, a lowest receiving rate needs to be set for a video stream with any bitrate, that is, when the receiving rate of the client to the video stream with the bitrate is less than the lowest receiving rate, the video playing of the client is not smooth, for example, a jam occurs.
Correspondingly, when the video source device obtains a video stream receiving rate sampling result of the client, whether the video stream receiving rate sampling result is greater than or equal to the lowest receiving rate of the preset code rate of the video stream can be judged, and if yes, the video stream receiving rate sampling result is determined to meet the rate requirement corresponding to the code rate of the current video stream; otherwise, determining that the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream.
In the embodiment of the application, when the sampling result of the receiving rate of the video stream does not meet the rate requirement corresponding to the code rate of the current video stream, the client can reduce the code rate of the current video stream and transmit the video stream to the client according to the reduced code rate, so that the fluency of video playing of the client is ensured, and the video preview and playback effect of the client is optimized.
It can be seen that, in the method flows shown in fig. 1 and fig. 2, the client samples the video stream receiving rate, and sends the video stream receiving rate sampling result to the video source device, and when it is determined that the video stream receiving rate sampling result of the client does not meet the rate requirement corresponding to the rate of the video stream, the video source device reduces the rate of the video stream, so as to ensure the fluency of video playing of the client, and optimize the video preview and playback effects of the client.
In one embodiment of the present application, when a plurality of video stream transmission channels exist between a video source device and a client, and a stream switching instruction carries a video stream receiving rate sampling result corresponding to each channel, and when the video stream receiving rate sampling result does not meet a rate requirement corresponding to a code rate of a current video stream, reducing the code rate of the current video stream may include:
for any channel, when the receiving rate sampling result of the video stream corresponding to the channel does not meet the rate requirement corresponding to the code rate of the video stream transmitted in the channel, the code rate of the video stream transmitted in the channel is reduced.
In this embodiment, when there are multiple video stream transmission channels between the video source device and the client, a specific implementation that the client samples the receiving rate of the video stream transmitted in each channel and sends the video stream receiving rate sampling result corresponding to each channel to the video source device may refer to related description in the method flow shown in fig. 1, and details of the embodiment of the present application are not repeated here.
In this embodiment, when the video source device obtains the video stream receiving rate sampling result corresponding to each channel, it may be respectively determined whether the video stream receiving rate sampling result corresponding to each channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel.
For example, the video source device may poll each channel, and sequentially determine whether the video stream receiving rate sampling result corresponding to each channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel.
In this embodiment, for any channel, the video source device may determine whether a video stream receiving rate sampling result corresponding to the channel is greater than or equal to a lowest receiving rate that presets a code rate of a video stream transmitted in the channel; if so, determining that the video stream receiving rate sampling result corresponding to the channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel; otherwise, determining that the video stream receiving rate sampling result corresponding to the channel does not meet the rate requirement corresponding to the code rate of the video stream transmitted in the channel.
When the video source device determines that the receiving rate sampling result of the video stream corresponding to the channel does not meet the rate requirement corresponding to the code rate of the video stream transmitted in the channel, the video source device can reduce the code rate of the video stream transmitted in the channel and transmit the video stream in the channel according to the reduced code rate.
Further, in consideration of the fact that in practical applications, a video source device may transmit a video stream to a client according to the lowest supported bitrate, but the receiving rate of the client to the video stream still does not meet the requirement (i.e. is less than the lowest receiving rate corresponding to the lowest bitrate), at this time, the video source device cannot reduce the bitrate of the video stream again.
Accordingly, in an implementation manner of this embodiment, before reducing the bitrate of the video stream transmitted in the channel, the method may further include:
judging whether the code rate of the video stream transmitted in the channel is the lowest code rate or not;
if yes, the code rate of the video stream transmitted in the channel is kept;
otherwise, determining to execute the above-mentioned reduction of the code rate of the video stream transmitted in the channel.
In this embodiment, for any channel, when the video source device determines that the receiving rate sampling result of the video stream corresponding to the channel does not meet the rate requirement corresponding to the code rate of the video stream transmitted in the channel, the video source device may determine whether the code rate of the video stream transmitted in the channel is the lowest code rate (the lowest code rate supported by the video source device); if yes, the video source device can keep the code rate of the video stream transmitted in the channel; otherwise, the video source device may reduce the bitrate of the video stream transmitted in the channel.
Further, in consideration of the fact that in practical application, the network performance may be better, but the bitrate of the video stream is lower, at this time, in order to further optimize the video playing effect of the client, for example, to improve the video image quality of the client, the bitrate of the video stream may be improved.
Accordingly, in one implementation of this embodiment, the video streaming control scheme may further include:
for any channel, when the receiving rate sampling result of the video stream corresponding to the channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel, judging whether the code rate of the video stream transmitted in the channel is the highest code rate;
if yes, the code rate of the video stream transmitted in the channel is kept;
otherwise, the code rate of the video stream transmitted in the channel is increased, and the video stream is transmitted to the client according to the increased code rate.
In this embodiment, for any channel, when the video source device determines that the video stream receiving rate sampling result corresponding to the channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel, the video source device may further determine whether the code rate of the video stream transmitted in the channel is the highest code rate; if yes, the video source device can keep the code rate of the video stream transmitted in the channel; otherwise, the video source device may increase the bitrate of the video stream transmitted in the channel to increase the picture definition of the video preview and playback of the client.
Further, in consideration of performance limitation of the client, in practical applications, there is often a limitation on the number of video streams with different bit rates supported by the client, for example, at most 8-way 1080P-capable video playback, at most 16-way 720P-capable video playback, at most 4-way 1080P-capable video playback and 8-way 720-capable video playback. Therefore, when increasing the bitrate of the video stream, the video source device also needs to consider the number of the video streams with different bitrates supported by the client.
Optionally, the number of the video streams with different bit rates supported by the client may be configured in the client in a form of a client configuration parameter, and when the client sends a video stream receiving rate sampling result to the video source device, the client configuration parameter may also be carried in the stream switching instruction and sent to the video source device.
Correspondingly, in an example, the stream switching instruction may further carry a client configuration parameter, where the client configuration parameter may include the number of video streams with different bit rates supported by the client;
the above increasing the bitrate of the video stream transmitted in the channel may include:
judging whether the number of the video streams with various code rates between the video source equipment and the client meets the requirement that the client supports the number of the video streams with different code rates after the code rate of the video stream transmitted in the channel is increased to the target code rate;
and if so, increasing the code rate of the video stream transmitted in the channel to the target code rate.
Specifically, for any channel, when the video source device determines that the video stream receiving rate sampling result corresponding to the channel meets the rate requirement corresponding to the bitrate of the video stream transmitted in the channel, the video source device may attempt to increase the bitrate of the video stream transmitted in the channel.
In this example, the video source device may determine the bitrate of the video stream after performing bitrate increase (referred to as a target bitrate herein), and then the video source device may count the number of video streams with different bitrates between the video source device and the client after increasing the bitrate of the video stream in the channel to the target bitrate, and determine whether the number of video streams with different bitrates between the video source device and the client meets the requirement that the client supports the number of video streams with different bitrates.
If so, the video source device may increase the code rate of the video stream transmitted in the channel to the target code rate.
It should be noted that, in this embodiment of the present application, for any channel, when the video source device determines that the bitrate of the video stream transmitted in the channel is increased to the target bitrate, and the number of the video streams with different bitrates between the video source device and the client does not meet the requirement that the client supports the number of the video streams with different bitrates, the video source device may determine whether there are other bitrates between the current bitrate of the video stream transmitted in the channel and the target bitrate; if the target code rate exists, updating the target code rate to the other code rate, judging again according to the mode until the target code rate meeting the requirement is found, and increasing the code rate of the video stream transmitted in the channel to the target code rate, or determining that the target code rate meeting the requirement does not exist, and keeping the code rate of the video stream transmitted in the channel.
Further, in the embodiment of the present application, in order to enable a user to better understand the bitrate adjustment situation, after the video source device adjusts the bitrate of the video stream, a bitrate adjustment notification message may also be sent to the client. The code rate adjustment notification message may carry a code rate adjustment condition (for example, the code rate is increased from the code rate 1 to the code rate 2, or the code rate is decreased from the code rate 2 to the code rate 1) or an adjusted code rate.
Accordingly, when the client receives the code rate adjustment notification message, the code rate adjustment condition carried in the message or the adjusted code rate can be displayed.
In order to enable those skilled in the art to better understand the technical solutions provided in the embodiments of the present application, the following describes the technical solutions provided in the embodiments of the present application with reference to specific application scenarios.
Referring to fig. 3, a schematic diagram of a specific application scenario provided in the embodiment of the present application is shown in fig. 3, where in the application scenario, a client is a Web client and a video source device is an NVR as an example.
Based on the application scenario shown in fig. 3, the video streaming control scheme provided in the embodiment of the present application is implemented as follows:
in this embodiment, taking video playback as an example, assume that there are N video transmission channels (channels 1 to N, respectively) between the Web client and the NVR.
In this embodiment, the Web client performs receiving rate sampling on the video stream transmitted by the NVR received by each channel by using a dynamic window sampling method.
For example, the Web client may sample the receiving rate of the video stream transmitted by the NVR received by each channel at regular time, and perform dynamic window average processing on the sampled data to obtain a video stream receiving rate sampling result corresponding to each channel.
The dynamic window average processing refers to moving the dynamic window end point to the current sampling point, and accumulating the sampling data in the dynamic window range to obtain an average value. The size of the dynamic window can be obtained from a configuration file preset by a Web client; for any channel, the dynamic window sampling diagram can be as shown in fig. 4.
In this embodiment, after obtaining the video stream receiving rate sampling result corresponding to each channel, the Web client may send a stream switching instruction to the NVR through a Web socket (socket), where the stream switching instruction may carry at least the video stream receiving rate sampling result corresponding to each channel and a configuration parameter of the Web client.
The configuration parameters of the Web client may include, but are not limited to, the number of videos with different code rates supported by the Web client at the same time; the code rate may include resolution, frame rate, and the like. The configuration parameters of the Web client can be acquired from a configuration file preset by the Web client.
The configuration file preset by the Web client exists in the Web client, and a user can dynamically adjust the configuration file according to actual requirements.
In this embodiment, when receiving a stream switching instruction sent by a Web client, the NVR acquires video stream receiving rate sampling results (hereinafter, referred to as sampling results) corresponding to each channel and configuration parameters of the Web client carried in the stream switching instruction, and polls each channel, where, for any channel (taking channel i as an example, i is greater than or equal to 1 and less than or equal to N):
and judging whether the sampling result corresponding to the channel i meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel i (hereinafter referred to as the rate requirement of the channel i).
And if the sampling result corresponding to the channel i meets the speed requirement of the channel i, judging whether the code rate of the video stream transmitted in the channel i (hereinafter referred to as the code rate of the channel i) is the highest code rate.
And if the code rate of the channel i is the highest code rate, keeping the code rate of the channel i.
And if the code rate of the channel i is not the highest code rate, determining the code rate which is one level higher than the code rate of the channel i as a target code rate, and judging whether the number of the video streams with the code rates between the NVR and the Web client side meets the requirement that the Web client side supports the number of the video streams with different code rates (hereinafter referred to as the number requirement of the Web client side for short) after the code rate of the channel i is increased to the target code rate.
And if the number of the video streams with each code rate between the NVR and the Web client meets the number requirement of the Web client, the code rate of the channel i is increased to the target code rate.
And if the number of the video streams with each code rate between the NVR and the Web client does not meet the number requirement of the Web client, maintaining the code rate of the channel i.
And if the sampling result corresponding to the channel i does not meet the speed requirement of the channel i, judging whether the code rate of the channel i is the lowest code rate.
And if the code rate of the channel i is the lowest code rate, keeping the code rate of the channel i.
If the code rate of the channel i is not the lowest code rate, the code rate of the channel i is reduced to a code rate one step lower (i.e., a code rate one step lower than the current code rate of the channel i), and a schematic diagram thereof may be as shown in fig. 5.
After the NVR completes the code rate adjustment of the video stream of each channel, the video stream transmission can be performed according to the adjusted code rate.
When the NVR performs code rate adjustment (including increasing or decreasing) on the channel i, the NVR may notify the Web client of the adjusted code rate, and the Web client displays the adjusted code rate.
In addition, when the bitrate of the channel i is the lowest bitrate and the rate requirement of the channel i is still not met, the NVR may send a prompt message to the Web client, where the prompt message is used to prompt that the current network state cannot support the fluency requirement of the video stream with the lowest bitrate.
In this embodiment, when receiving the video stream transmitted by the NVR, the Web client may decode the video stream, and perform video playback according to the decoded video data.
In the embodiment of the application, a client carries out receiving rate sampling results on received video streams transmitted by video source equipment, and sends the obtained receiving rate sampling results of the video streams to the video source equipment; when the video source equipment determines that the video stream receiving rate sampling result of the client does not meet the rate requirement corresponding to the code rate of the current video stream, the code rate of the current video stream is reduced, and video stream transmission is carried out on the client according to the reduced code rate, so that the video playing fluency of the client is ensured, and the video preview and playback effect of the client is optimized.
The methods provided herein are described above. The following describes the apparatus provided in the present application:
referring to fig. 6, a schematic structural diagram of a video streaming control apparatus according to an embodiment of the present disclosure is provided, where the video streaming control apparatus may be applied to a video source device in the foregoing method embodiment, as shown in fig. 6, the video streaming control apparatus may include:
a receiving unit 610, configured to receive a stream switching instruction sent by a client, where the stream switching instruction carries a video stream receiving rate sampling result;
a determining unit 620, configured to determine whether the video stream receiving rate sampling result meets a rate requirement corresponding to a code rate of a current video stream;
a control unit 630, configured to reduce a bitrate of the current video stream when the video stream receiving rate sampling result does not meet a rate requirement corresponding to the bitrate of the current video stream;
a sending unit 640, configured to perform video streaming transmission to the client according to the reduced bitrate.
In an alternative embodiment, there are multiple video streaming channels between the video source device and the client; the stream switching instruction carries video stream receiving rate sampling results corresponding to all channels;
the determining unit 620 is specifically configured to determine, for any channel, whether a video stream receiving rate sampling result corresponding to the channel meets a rate requirement corresponding to a code rate of a video stream transmitted in the channel;
the control unit 630 is specifically configured to, for any channel, reduce the bitrate of the video stream transmitted in the channel when the video stream receiving rate sampling result corresponding to the channel does not meet the rate requirement corresponding to the bitrate of the video stream transmitted in the channel.
In an optional implementation manner, the determining unit 620 is further configured to determine whether a bitrate of a video stream transmitted in the channel is a lowest bitrate when the video stream receiving rate sampling result does not meet a rate requirement corresponding to a bitrate of a current video stream;
the control unit 630 is further configured to, when the bitrate of the video stream transmitted in the channel is the lowest bitrate, maintain the bitrate of the video stream transmitted in the channel;
the control unit 630 is further specifically configured to reduce the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is not the lowest bitrate.
In an optional implementation manner, the determining unit 620 is further configured to determine, for any channel, whether a bitrate of a video stream transmitted in the channel is a highest bitrate when a receiving rate sampling result of the video stream corresponding to the channel meets a rate requirement corresponding to a bitrate of the video stream transmitted in the channel;
the control unit 630 is further configured to, when the bitrate of the video stream transmitted in the channel is the highest bitrate, maintain the bitrate of the video stream transmitted in the channel;
the control unit 630 is further configured to increase the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is not the highest bitrate;
the sending unit 640 is further configured to perform video streaming transmission to the client according to the increased bitrate.
In an optional implementation manner, the stream switching instruction further carries a client configuration parameter, where the client configuration parameter includes the number of video streams with different code rates supported by the client;
the determining unit 620 is further configured to determine whether the number of the video streams with different code rates between the video source device and the client meets the requirement that the client supports the number of the video streams with different code rates after the code rate of the video stream transmitted in the channel is increased to the target code rate;
the control unit 630 is specifically configured to increase the bitrate of the video stream transmitted in the channel to the target bitrate when the number of the video streams with different bitrates between the video source device and the client meets the requirement that the client supports the number of the video streams with different bitrates after increasing the bitrate of the video stream transmitted in the channel to the target bitrate.
In an optional implementation manner, the sending unit 640 is further configured to send a rate adjustment notification message to the client.
Fig. 7 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present disclosure. The electronic device may include a processor 701, a communication interface 702, a memory 703, and a communication bus 704. The processor 701, the communication interface 702, and the memory 703 communicate with each other via a communication bus 704. Wherein, the memory 703 is stored with a computer program; the processor 701 may execute the video streaming control method described in the method flow shown in fig. 2 by executing a program stored on the memory 703.
The memory 703, as referred to herein, may be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like. For example, the memory 702 may be: RAM (random access memory), volatile memory, non-volatile memory, flash memory, a storage drive (e.g., a hard drive), a solid state drive, any type of storage disk (e.g., an optical disk, dvd, etc.), or similar storage medium, or a combination thereof.
Embodiments of the present application also provide a machine-readable storage medium, such as the memory 703 in fig. 7, storing a computer program, which can be executed by the processor 701 in the electronic device shown in fig. 7 to implement the video streaming control method described above.
Referring to fig. 8, a schematic structural diagram of a video streaming control apparatus according to an embodiment of the present disclosure is provided, where the video streaming control apparatus may be applied to a client in the foregoing method embodiment, and as shown in fig. 8, the video streaming control apparatus may include:
a receiving unit 810, configured to receive a video stream transmitted by a video source device;
a sampling unit 820, configured to perform receiving rate sampling on the video stream transmitted by the video source device received by the receiving unit to obtain a video stream receiving rate sampling result;
a sending unit 830, configured to send a stream switching instruction to the video source device, where the stream switching instruction carries the video stream receiving rate sampling result.
In an alternative embodiment, there are multiple video streaming channels between the video source device and the client;
the sampling unit 820 is specifically configured to perform receiving rate sampling on the video streams transmitted in each channel respectively to obtain a video stream receiving rate sampling result corresponding to each channel.
Fig. 9 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present disclosure. The electronic device may include a processor 901, a communication interface 902, a memory 903, and a communication bus 904. The processor 901, the communication interface 902, and the memory 903 communicate with each other via a communication bus 904. Wherein, the memory 903 is stored with a computer program; the processor 901 can execute the video streaming control method described in the method flow shown in fig. 1 by executing a program stored on the memory 903.
The memory 903 referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like. For example, the memory 902 may be: RAM (random access memory), volatile memory, non-volatile memory, flash memory, a storage drive (e.g., a hard drive), a solid state drive, any type of storage disk (e.g., an optical disk, dvd, etc.), or similar storage medium, or a combination thereof.
Embodiments of the present application also provide a machine-readable storage medium, such as the memory 903 in fig. 9, storing a computer program, which can be executed by the processor 901 in the electronic device shown in fig. 9 to implement the video streaming control method described above.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (20)
1. A video streaming control method is applied to a video source device in a video monitoring system, and is characterized by comprising the following steps:
receiving a stream switching instruction sent by a client, wherein the stream switching instruction carries a video stream receiving rate sampling result;
and when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream, reducing the code rate of the current video stream, and transmitting the video stream to the client according to the reduced code rate.
2. The method of claim 1, wherein there are multiple video streaming channels between the video source device and the client; the stream switching instruction carries video stream receiving rate sampling results corresponding to all channels;
when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream, reducing the code rate of the current video stream, including:
for any channel, when the receiving rate sampling result of the video stream corresponding to the channel does not meet the rate requirement corresponding to the code rate of the video stream transmitted in the channel, the code rate of the video stream transmitted in the channel is reduced.
3. The method of claim 2, wherein before reducing the bitrate of the video stream transmitted in the channel, further comprising:
judging whether the code rate of the video stream transmitted in the channel is the lowest code rate or not;
if yes, the code rate of the video stream transmitted in the channel is kept;
otherwise, determining to perform the reducing of the bitrate of the video stream transmitted in the channel.
4. The method of claim 2, further comprising:
for any channel, when the receiving rate sampling result of the video stream corresponding to the channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel, judging whether the code rate of the video stream transmitted in the channel is the highest code rate;
if yes, the code rate of the video stream transmitted in the channel is kept;
otherwise, the code rate of the video stream transmitted in the channel is increased, and the video stream is transmitted to the client according to the increased code rate.
5. The method according to claim 4, wherein the stream switching instruction further carries a client configuration parameter, and the client configuration parameter includes the number of video streams with different bit rates supported by the client;
the improving the code rate of the video stream transmitted in the channel includes:
judging whether the number of the video streams with various code rates between the video source equipment and the client meets the requirement that the client supports the number of the video streams with different code rates after the code rate of the video stream transmitted in the channel is increased to a target code rate;
and if so, increasing the code rate of the video stream transmitted in the channel to the target code rate.
6. The method of claim 1, wherein after reducing the bitrate of the current video stream, further comprising:
and sending a code rate adjustment notification message to the client.
7. A video streaming control method is applied to a client in a video monitoring system, and is characterized by comprising the following steps:
carrying out receiving rate sampling on a received video stream transmitted by video source equipment to obtain a video stream receiving rate sampling result;
and sending a stream switching instruction to the video source equipment, wherein the stream switching instruction carries the video stream receiving rate sampling result.
8. The method of claim 7, wherein there are multiple video streaming channels between the video source device and the client;
the receiving rate sampling of the received video stream transmitted by the video source device comprises:
and respectively carrying out receiving rate sampling on the video streams transmitted in the channels to obtain the video stream receiving rate sampling results corresponding to the channels.
9. A video streaming control apparatus for a video source device in a video surveillance system, the apparatus comprising:
the receiving unit is used for receiving a stream switching instruction sent by a client, wherein the stream switching instruction carries a video stream receiving rate sampling result;
the judging unit is used for judging whether the video stream receiving rate sampling result meets the rate requirement corresponding to the code rate of the current video stream;
the control unit is used for reducing the code rate of the current video stream when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream;
and the sending unit is used for carrying out video stream transmission to the client according to the reduced code rate.
10. The apparatus of claim 9, wherein there are multiple video streaming channels between the video source device and the client; the stream switching instruction carries video stream receiving rate sampling results corresponding to all channels;
the determining unit is specifically configured to determine, for any channel, whether a video stream receiving rate sampling result corresponding to the channel meets a rate requirement corresponding to a code rate of a video stream transmitted in the channel;
the control unit is specifically configured to, for any channel, reduce a bitrate of a video stream transmitted in the channel when a video stream receiving rate sampling result corresponding to the channel does not meet a rate requirement corresponding to the bitrate of the video stream transmitted in the channel.
11. The apparatus of claim 10,
the judging unit is further configured to judge whether the code rate of the video stream transmitted in the channel is the lowest code rate when the video stream receiving rate sampling result does not meet the rate requirement corresponding to the code rate of the current video stream;
the control unit is further configured to maintain the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is the lowest bitrate;
the control unit is further specifically configured to reduce the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is not the lowest bitrate.
12. The apparatus of claim 10,
the judging unit is further configured to, for any channel, judge whether the code rate of the video stream transmitted in the channel is the highest code rate when the video stream receiving rate sampling result corresponding to the channel meets the rate requirement corresponding to the code rate of the video stream transmitted in the channel;
the control unit is further configured to maintain the bitrate of the video stream transmitted in the channel when whether the bitrate of the video stream transmitted in the channel is the highest bitrate;
the control unit is further configured to increase the bitrate of the video stream transmitted in the channel when the bitrate of the video stream transmitted in the channel is not the highest bitrate;
and the sending unit is also used for carrying out video stream transmission to the client according to the improved code rate.
13. The apparatus according to claim 12, wherein the stream switching instruction further carries a client configuration parameter, and the client configuration parameter includes a number of video streams with different bit rates supported by the client;
the determining unit is further configured to determine whether the number of the video streams with different code rates between the video source device and the client meets a requirement that the client supports the number of the video streams with different code rates after the code rate of the video stream transmitted in the channel is increased to a target code rate;
the control unit is specifically configured to increase the code rate of the video stream transmitted in the channel to the target code rate when the number of the video streams with different code rates between the video source device and the client meets the requirement that the client supports the number of the video streams with different code rates after increasing the code rate of the video stream transmitted in the channel to the target code rate.
14. The apparatus of claim 9,
the sending unit is further configured to send a code rate adjustment notification message to the client.
15. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any of claims 1-6 when executing a program stored in the memory.
16. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of claims 1 to 6.
17. A video streaming control device applied to a client in a video monitoring system is characterized by comprising:
the receiving unit is used for receiving a video stream transmitted by the video source equipment;
the sampling unit is used for sampling the receiving rate of the video stream transmitted by the video source equipment received by the receiving unit to obtain a video stream receiving rate sampling result;
and the sending unit is used for sending a stream switching instruction to the video source equipment, wherein the stream switching instruction carries the video stream receiving rate sampling result.
18. The apparatus of claim 17, wherein there are multiple video streaming channels between the video source device and the client;
the sampling unit is specifically configured to perform receiving rate sampling on the video streams transmitted in the channels respectively to obtain video stream receiving rate sampling results corresponding to the channels.
19. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of claim 7 or 8 when executing a program stored in the memory.
20. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of claim 7 or 8.
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| CN201810614847.7A CN110611789A (en) | 2018-06-14 | 2018-06-14 | Video streaming transmission control method and device, electronic equipment and storage medium |
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| CN201810614847.7A CN110611789A (en) | 2018-06-14 | 2018-06-14 | Video streaming transmission control method and device, electronic equipment and storage medium |
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Application publication date: 20191224 |