WO2020155913A1

WO2020155913A1 - Video transmission method, device, apparatus, and storage medium

Info

Publication number: WO2020155913A1
Application number: PCT/CN2019/126714
Authority: WO
Inventors: 田建超
Original assignee: 广州视源电子科技股份有限公司; 广州视臻信息科技有限公司
Priority date: 2019-02-01
Filing date: 2019-12-19
Publication date: 2020-08-06
Also published as: CN109660826A; CN109660826B

Abstract

The present disclosure provides a video transmission method, device, apparatus, and a computer readable storage medium, wherein the method comprises: when the current uplink code rate update is detected, and a subscribed video stream with the first resolution is not sent to a subscription apparatus at the previous moment, acquiring video subscription information of the subscription apparatus; acquiring the lowest code rate and a code rate threshold corresponding to the first resolution; if the current uplink code rate is less than the sum of the lowest code rate and the code rate threshold corresponding to the first resolution, and the video stream comprises a second resolution which is unsubscribed and lower than the first resolution, acquiring the lowest code rate and a code rate threshold corresponding to the second resolution; if the current uplink code rate is greater than or equal to the sum of the lowest code rate and the code rate threshold corresponding to the second resolution, sending the video stream corresponding to the second resolution to the subscription apparatus. The present disclosure implements the control of switching between the resolution levels, avoids the frequent switching of the resolution levels due to the influence of the uplink code rate, and realizes the comprehensive utilization of the uplink bandwidth.

Description

Video transmission method, device, equipment and storage medium

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office with application number 201910106110.9 on February 1, 2019. The entire content of the above application is incorporated into this application by reference.

Technical field

The present disclosure relates to the field of communication transmission technology, for example, to a video transmission method, device, device, and computer-readable storage medium.

Background technique

In the publisher/subscriber model based on events (such as video), the needs of subscribers are also very different. Taking video subscription as an example, different subscribers expect different content, such as terminals with different sizes of screens. The video resolution will be different. Therefore, when the video source of the publishing end is multicast, it often needs to support sending multiple video streams of the same or different resolutions. The most common ones are sending 180p, 360p, 720p and 1080p, etc. For each video stream with different levels of resolution, the video stream information that needs to be sent is determined according to the subscription status of the subscriber.

After receiving the subscription information from the subscriber, the video source as the publisher first needs to assign a bit rate to the resolution level subscribed by the subscriber. The current conventional practice of related technologies is to set a minimum bit rate for each level of division. , The target bit rate and the highest bit rate, and then when the upstream bit rate of the video source end is sufficient, assign the lowest bit rate, target bit rate and highest bit rate to each level in turn until all the upstream bit rates are allocated. At the same time, in order to improve the quality of video transmission, related technologies usually perform adaptive bit rate control at the video source, and adjust the subscriber's subscription level according to the real-time situation of the uplink bit rate. For example, when the uplink bit rate of the video source is reduced, Then, send the video stream lower than the subscription level to the subscriber to ensure the smoothness of the video; when the upstream bit rate of the video source end is sufficient, send the subscribed video stream of this level to the subscriber to ensure the video Clarity.

In the process of implementing the present disclosure, the inventor found that when the network fluctuates greatly, if the bit rate allocated to a certain level fluctuates just above the minimum bit rate, the source will always send the video stream and Switching between not sending the video stream of this level, because every time it is never sent to the beginning of the transmission, the key frame corresponding to this level needs to be re-sent, thus occupying more uplink bandwidth, which not only causes a waste of resources, but also frequent videos The switching of the resolution also affects the user's viewing experience.

Summary of the invention

In view of the above problems, the purpose of the present disclosure is to provide a video transmission method, device, equipment, and computer-readable storage medium, to avoid frequent switching of frequency levels due to the influence of the uplink code rate, and to achieve comprehensive use of uplink bandwidth.

In the first aspect, embodiments of the present disclosure provide a video transmission method, including the following steps:

When it is detected that the current uplink bit rate is updated, and the subscribed video stream of the first resolution is not sent to the subscribing device at the last moment, the video subscription information of the subscribing device is acquired; wherein the video subscription information includes the subscribed video The first resolution of the stream;

Acquiring, according to the first resolution, the lowest bit rate and the bit rate threshold corresponding to the first resolution;

If the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, sending a video stream corresponding to the first resolution to the subscription device;

If the current uplink bit rate is less than the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream includes an unsubscribed second resolution lower than the first resolution , Obtaining the lowest bit rate and the bit rate threshold corresponding to the second resolution according to the second resolution;

If the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, sending the video stream corresponding to the second resolution to the subscription device.

In the first implementation manner of the first aspect, if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, use the first resolution to The sending of the video stream by the subscription device includes:

If the current allocable code rate is greater than or equal to the sum of the minimum code rate corresponding to the first resolution and the code rate threshold, determine the transmission code rate according to the minimum code rate corresponding to the first resolution;

Sending a video stream corresponding to the first resolution to the subscription device at the transmission bit rate.

In a second implementation manner of the first aspect, if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, sending to the subscription device corresponds to The video stream of the second resolution includes:

If the current allocable code rate is greater than or equal to the sum of the minimum code rate corresponding to the second resolution and the code rate threshold, determine the transmission code rate according to the minimum code rate corresponding to the second resolution;

Sending a video stream corresponding to the second resolution to the subscription device at the transmission code rate.

According to the first implementation manner or the second implementation manner of the first aspect, in the third implementation manner of the first aspect, the current allocable code rate is the difference between the uplink code rate and the transmission code rate .

According to the third implementation manner of the first aspect, the fourth implementation manner of the first aspect further includes:

When it is detected that the current uplink bit rate is updated, and the video stream of the first resolution has been sent to the subscribing device at the previous moment, obtain the lowest code corresponding to the first resolution of the video stream subscribed by the subscribing device Rate and bit rate threshold;

If the current allocable bit rate is greater than or equal to the difference between the lowest bit rate corresponding to the first resolution and the bit rate threshold, sending the video stream corresponding to the first resolution to the subscription device.

According to the fourth implementation manner of the first aspect, in the fifth implementation manner of the first aspect, the method further includes:

If the current allocable bit rate is less than the difference between the lowest bit rate corresponding to the first resolution and the bit rate threshold, determine whether the video stream includes an unsubscribed second resolution lower than the first resolution rate;

If the video stream includes an unsubscribed second resolution lower than the first resolution, obtaining the lowest bit rate and the bit rate threshold of the second resolution according to the second resolution;

If the current allocable bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, sending the video stream corresponding to the second resolution to the subscription device.

According to any one of the foregoing implementation manners of the first aspect, in the sixth implementation manner of the first aspect, the method further includes:

Receive video subscription information of the subscription device; wherein the video subscription information includes the first resolution of the subscribed video stream.

In a second aspect, the present disclosure provides a video transmission device, including:

The video subscription information obtaining unit is configured to obtain the video subscription information of the subscribing device when it is detected that the current uplink bit rate is updated and the subscribed video stream of the first resolution is not sent to the subscribing device at the previous moment; The video subscription information includes the first resolution of the subscribed video stream;

The first code rate parameter determination unit is configured to obtain the minimum code rate corresponding to the first resolution and the code rate threshold according to the first resolution;

The first video stream sending unit is configured to, if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, send to the subscribing device corresponding to the first resolution Rate of video streaming;

The second bit rate parameter determination unit is configured to: if the current uplink bit rate is less than the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream includes a bit rate lower than the first resolution When the second resolution is not subscribed to, obtain the lowest bit rate and the bit rate threshold corresponding to the second resolution according to the second resolution;

The second video stream sending unit is configured to send a signal corresponding to the second resolution to the subscription device if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold. Rate of the video stream.

In a first implementation manner of the second aspect, the first video stream sending unit includes:

The first transmission code rate determination module is configured to, if the current allocable code rate is greater than or equal to the sum of the lowest code rate corresponding to the first resolution and the code rate threshold, according to the lowest code rate corresponding to the first resolution Rate determines the transmission code rate;

The first video stream sending module is configured to send the video stream corresponding to the first resolution to the subscription device at the transmission bit rate.

In a second implementation manner of the second aspect, the second video stream sending unit includes:

The second transmission code rate determining unit is configured to, if the current allocable code rate is greater than or equal to the sum of the lowest code rate corresponding to the second resolution and the code rate threshold, according to the lowest code rate corresponding to the second resolution Rate determines the transmission code rate;

The second video stream sending module is configured to send the video stream corresponding to the second resolution to the subscription device at the transmission bit rate.

According to the first implementation manner or the second implementation manner of the second aspect, in the third implementation manner of the second aspect, the current allocable code rate is the difference between the uplink code rate and the transmission code rate .

According to the third implementation manner of the second aspect, the fourth implementation manner of the second aspect further includes:

The third bit rate parameter determination module is used to obtain the video subscribed by the subscribing device when the current uplink bit rate update is detected and the video stream of the first resolution has been sent to the subscribing device at the last moment The lowest bit rate and the bit rate threshold corresponding to the first resolution of the stream;

The third video stream sending unit is configured to send to the subscription device the difference between the lowest bit rate corresponding to the first resolution and the bit rate threshold if the current allocable bit rate is greater than or equal to the Resolution of the video stream.

According to the fourth implementation manner of the second aspect, the fifth implementation manner of the second aspect further includes:

The second resolution determining module is configured to determine whether the video stream includes a bit rate lower than the first bit rate if the current allocable bit rate is less than the minimum bit rate corresponding to the first resolution and the bit rate threshold. The unsubscribed second resolution of the resolution;

The fourth code rate parameter determination module is configured to, if the video stream includes an unsubscribed second resolution lower than the first resolution, obtain the lowest code of the second resolution according to the second resolution Rate and bit rate threshold;

The fourth video stream sending unit is configured to send to the subscription device corresponding to the second bit rate if the current allocable bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold. Resolution of the video stream.

According to any one of the foregoing implementation manners of the second aspect, in the sixth implementation manner of the second aspect, the method further includes:

The subscription information receiving module is configured to receive the video subscription information of the subscription device; wherein the video subscription information includes the first resolution of the subscribed video stream.

In a third aspect, embodiments of the present disclosure provide a video transmission device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor executes the The computer program implements the video transmission method as described in any one of the first aspect.

In a fourth aspect, an embodiment of the present disclosure provides a computer-readable storage medium, the computer-readable storage medium includes a stored computer program, wherein the device where the computer-readable storage medium is located is controlled when the computer program is running Perform the video transmission method as described in any one of the first aspect.

The above embodiments have the following beneficial effects:

When it is detected that the current uplink bit rate is updated, and the subscribed video stream of the first resolution is not sent to the subscribing device at the last moment, obtain the video subscription information of the subscribing device and determine the minimum corresponding to the first resolution of the subscribed video stream The code rate and the code rate threshold, if the current uplink code rate is greater than or equal to the sum of the lowest code rate corresponding to the first resolution and the code rate threshold, send to the subscription device the data corresponding to the first resolution Video stream, if the current uplink bit rate is less than the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream includes an unsubscribed second bit rate lower than the first resolution For resolution, obtain the lowest bit rate and the bit rate threshold corresponding to the second resolution according to the second resolution, if the current uplink bit rate is greater than or equal to the lowest bit rate corresponding to the second resolution and the bit rate threshold The sum of the rate thresholds, the video stream corresponding to the second resolution is sent to the subscription device, where the condition for switching from the first resolution to the second resolution is determined by the lowest bit rate of the second resolution and the switching If the threshold is determined, the sending conditions of the first resolution and the second resolution are dynamically adjusted through the corresponding minimum bit rate and switching threshold, so that the switching between video stream levels of different resolutions is no longer based on each video stream The lowest bit rate of the level, so as to realize the control of switching between resolutions, which is helpful to reduce the frequent switching of video streams of different resolutions caused by the influence of the upstream bit rate, thereby reducing the transmission of key frames and reducing excessive The occupancy of the uplink bandwidth realizes the comprehensive use of operating resources, while also ensuring a good subscription experience for subscribers.

Description of the drawings

In order to explain the technical solutions of the present disclosure more clearly, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure, which are common in the art. As far as technical personnel are concerned, they can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic flowchart of a video transmission method provided by the first embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a video transmission device provided by a second embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a video transmission device provided by a third embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

Referring to Fig. 1, the first embodiment of the present disclosure provides a video transmission method, which can be executed by a video transmission device, and the video transmission device may be composed of two or more physical entities, or may be composed of one physical entity. , The video transmission device can be a computing device such as a computer, mobile phone, tablet, smart tablet, or server. The video transmission device serves as the publisher's video source terminal in the publish-subscribe mode, and transmits the subscribed video stream to the subscribing device according to the subscription status of the subscribing device. The subscribing device may be a computer, a mobile phone, a tablet, a smart tablet or a server Such as computing devices, the subscription device may subscribe to a video stream of one resolution level according to its actual situation, or may subscribe to video streams of multiple resolution levels.

Referring to Figure 1, the video transmission method includes the following steps:

S11: When it is detected that the current uplink bit rate is updated, and the subscribed video stream of the first resolution is not sent to the subscribing device at the previous moment, obtain the video subscription information of the subscribing device; wherein, the video subscription information includes The first resolution of the subscribed video stream.

In the embodiment of the present disclosure, in the video transmission device as a video source publisher, the video stream is set with several resolutions. For example, the video stream is set with 4 resolution levels, namely 180p, 360p, 720p and 1080p, etc., the subscribing device will subscribe the desired video stream to the video transmission device as the publisher of the video source. When subscribing to the video transmission device, the subscriber needs to carry resolution information to inform the The video transmission device itself expects to receive the resolution. After receiving the video subscription information of the subscription device, the video transmission device obtains the first resolution of the subscribed video stream included in the video subscription information, and then according to the The first resolution expected by the subscribing device determines the video stream to be sent. It should be noted that the subscribing device may subscribe to a video stream of one resolution level, or may subscribe to multiple video streams of different resolution levels. The resolution level subscribed by the subscribing device is distinguished from the non-subscribed resolution level, the resolution level of the video stream subscribed by the subscribing device is defined as the first resolution, and the subscriber is not subscribed The resolution level of the video stream is defined as the second resolution.

In the embodiment of the present disclosure, when it is detected that the current uplink bit rate is updated, and the subscribed video stream of the first resolution is not sent to the subscribed device at the last moment, it may be that the video transmission device has just received the subscriber's In the case of a subscription request, the first video stream level was not allocated a bit rate during the last uplink bit rate update, or it may be that the last allocable bit rate during the last uplink bit rate update did not meet the requirements of the first resolution. The code rate range, therefore, either the second resolution is determined by the downward switching, or the second resolution is not met and the second resolution is not met, and the video transmission device acquires the video subscription information of the subscription receiving device.

S12: Obtain a minimum bit rate and a bit rate threshold corresponding to the first resolution according to the first resolution.

In the embodiments of the present disclosure, it should be noted that, in the video transmission device as the video source publisher, the video stream is set with several resolutions, for example, the video stream is set with 4 resolution levels, respectively For 180P, 360P, 720P, 1080P, etc., each resolution level is set with the corresponding minimum bit rate and switching threshold, where the minimum bit rate represents the minimum transmission bit rate required to transmit to the video stream of that resolution level For example, setting the minimum bit rate required for a 180P resolution video stream is 30k, and the corresponding switching threshold is 0K; a 360P resolution video stream requires a minimum bit rate of 200k, and the corresponding switching threshold is 50K; 720P resolution video The minimum bit rate required for a stream is 600k, and the corresponding switching threshold is 100K; the minimum bit rate required for a 1080P resolution video stream is 800k, and the corresponding switching threshold is 150K, etc.; it should be noted that the present disclosure is for the resolution level The division of the resolution and the specific values of the minimum bit rate and switching threshold are not limited in any way. The above values are only examples. Those skilled in the art can understand that the division of the resolution levels and the minimum bit rate and switching threshold The setting of the specific value can be set according to actual conditions. To further send the video stream subscribed by the subscription device, first, the video transmission device obtains the lowest bit rate corresponding to the first resolution according to the first resolution, and The bit rate threshold is used to further determine whether to send the video stream of the first resolution.

S13: If the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, send a video stream corresponding to the first resolution to the server.

In the embodiment of the present disclosure, the subscription device may subscribe to a video stream of one resolution level, or may subscribe to multiple video streams of different resolution levels. When the subscription device subscribes to a video stream of a resolution level, the current The assignable code rate is the difference between the uplink code rate and the transmission code rate. If the assigned transmission code rate is 0, then the current assignable code rate is equal to the current uplink code rate. The video transmission device determines that the current assignable code rate (that is, the current Uplink code rate) The relationship between the minimum code rate corresponding to the first resolution and the sum of the code rate threshold, if the current allocable code rate is greater than or equal to the minimum code rate corresponding to the first resolution and the If the sum of the bit rate thresholds, the video transmission device determines the transmission bit rate according to the lowest bit rate corresponding to the first resolution, and then sends the transmission bit rate corresponding to the first resolution to the subscription device Rate of the video stream.

In the embodiment of the present disclosure, when the video transmission device subscribes to multiple video streams of different resolution levels, the video transmission device starts with the first resolution of the lowest level of subscription and starts with the highest level of subscription. The first resolution of traverses all the first resolutions subscribed to by the subscription device from low to high. Among the first resolutions of each level of traversal, if you traverse to the first resolution The first resolution with a lower level may have been traversed before and the corresponding transmission code rate may have been determined, then the transmission code rate is not 0, and the current allocable code rate is the uplink code rate and the transmission code rate The video transmission device determines the relationship between the current allocable bit rate and the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold. If the current allocable bit rate is greater than or equal to the The minimum bit rate corresponding to the first resolution and the sum of the bit rate threshold, the video transmission device determines the transmission bit rate according to the minimum bit rate corresponding to the first resolution, and then transmits the bit rate to the The subscription device sends a video stream corresponding to the first resolution.

S14: If the current uplink bit rate is less than the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream includes an unsubscribed second resolution lower than the first resolution In the case of data rate, the minimum bit rate and the bit rate threshold corresponding to the second resolution are obtained according to the second resolution.

In the embodiment of the present disclosure, the video transmission device determines the relationship between the current allocable bit rate and the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold. If the current allocable bit rate is less than the total bit rate, The sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold indicates that the current allocable bit rate does not support sending the video stream of the first resolution, and the video transmission device determines whether the video stream is Including an unsubscribed second resolution lower than the first resolution to perform a resolution switching process, if the video stream includes an unsubscribed second resolution lower than the first resolution , The video transmission device obtains the lowest bit rate and the bit rate threshold of the second resolution according to the second resolution.

S15: If the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, send a video stream corresponding to the second resolution to the server.

In the embodiment of the present disclosure, the video transmission device determines the magnitude relationship between the current allocable bit rate and the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold. If the current allocable bit rate is greater than or Equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, the video transmission device determines the transmission bit rate according to the lowest bit rate corresponding to the second resolution, and uses the transmission code Send the video stream corresponding to the second resolution to the subscription device; if the current allocable bit rate is less than the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, the video The transmission device does not send the video stream; it should be noted that if the video transmission device acquires multiple unsubscribed second resolutions, and the second resolutions all meet the current allocable bit rate greater than or equal to all When the minimum bit rate corresponding to the second resolution and the sum of the bit rate threshold are selected, the second resolution with the highest level is selected. For example, a subscription device subscribes to a video stream with a first resolution of 720P. To meet the bit rate requirements of this level, the transmission code rate cannot be determined for the first video stream level, but the 180P level and 360P level of the second resolution that are not subscribed meet the conditions, then the higher level 360P level is selected to determine the transmission code rate.

In the embodiment of the present disclosure, the video transmission device encodes and sends the video stream whose transmission bit rate is determined, because the resolution of the video stream whose transmission bit rate is determined is different from that of the subscription device to the video transmission device. The expected resolution of the subscribed video stream may be different. If the upstream bit rate meets the sum of the minimum bit rate corresponding to the subscribed first resolution and the bit rate threshold, the video transmission device sends the first subscribed to the subscribed device. Video streams with the same resolution and quality, but when the upstream bit rate is low, that is, the minimum bit rate corresponding to the first resolution subscribed and the sum of the bit rate threshold are not met, the video transmission device will send according to the conditions The subscriber is not subscribed to the second resolution quality video stream, the first resolution level is higher than the second resolution level, when the video transmission device starts to send a certain resolution video stream First, it is necessary to send the key frame corresponding to the resolution level. When the subscribing device receives the key frame corresponding to the resolution level of the video stream, it can start to decode the received video stream according to the received key frame.

In the embodiment of the present disclosure, for example, the video transmission device sets a total of 4 resolution levels of 180P, 360P, 720P, and 1080P. The minimum bit rate required to set a video stream with a resolution of 180P is 30k, and the corresponding switching threshold is 0K; The minimum bit rate required for a 360P resolution video stream is 200k, and the corresponding switching threshold is 50K; the minimum bit rate required for a 720P resolution video stream is 600k, and the corresponding switching threshold is 100K; the 1080P resolution video stream requires The minimum bit rate is 800k, and the corresponding switching threshold is 150K; for example, the subscription device subscribes to the video transmission device for a 360P-level video stream, at the first moment, the upstream bit rate of the video transmission device as the video publishing source is 210k , Video transmission equipment The video transmission equipment needs to determine the current allocable bit rate at this time, that is, whether the uplink bit rate at this moment meets the sum of the minimum bit rate corresponding to the first resolution greater than or equal to 360P and the switching threshold, because 210K It is less than 250k, so the transmission bit rate is not determined for the subscribed 360P first video stream level. Next, determine whether the down switching condition is met: determine that there is a non-subscribed 180P lower than the subscribed 360P first resolution level The second resolution, and the uplink bit rate at this moment is greater than the sum of the minimum bit rate and the switching threshold corresponding to the second resolution, 210K is greater than 30K, and the downward switching conditions are met, according to the minimum code of the second resolution of 180P The transmission bit rate is determined by the transmission bit rate, and the video stream corresponding to the second resolution is sent to the subscriber at the transmission bit rate; at the second moment, the uplink bit rate of the video transmission device as the video publishing source is updated to 300k, because the video transmission device did not determine the transmission bit rate for the first video stream level of 360P at the first moment, it is necessary to determine the current allocable bit rate, that is, whether the uplink bit rate meets the corresponding first resolution greater than or equal to 360P The sum of the minimum bit rate and the switching threshold of 300k is higher than 250k. Therefore, the transmission bit rate is determined according to the minimum bit rate of the first resolution of 360P, and the transmission bit rate is used to send the transmission bit rate corresponding to the subscribed device The first resolution video stream; at the third moment, the upstream bit rate of the video transmission device as the video publishing source is 180k. Because the source at the second moment determines the transmission bit rate for the first video stream level of 360P, it needs Determine the current allocable bit rate, that is, whether the uplink bit rate at this moment meets the difference between the minimum bit rate corresponding to the first resolution greater than or equal to 360P and the switching threshold. Since 180k is higher than 150k, the third moment is still based on the 360P first resolution. The lowest bit rate of a resolution determines the transmission bit rate, and sends the video stream corresponding to the first resolution to the subscription device at the transmission bit rate, so that even if the uplink bit rate fluctuates near the lowest bit rate As long as the amplitude of the fluctuation does not exceed 2 times the switching threshold, frequent switching will not occur, thereby avoiding occupying too much upstream bandwidth and ensuring the transmission efficiency of the video stream.

In summary, the first embodiment of the present disclosure provides a video transmission method, which receives video subscription information of a subscription device and determines the lowest bit rate and bit rate threshold corresponding to the first resolution of the subscribed video stream. If the current uplink The bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream corresponding to the first resolution is sent to the subscription device, if the current uplink bit rate is less than the total bit rate. When the minimum bit rate corresponding to the first resolution and the sum of the bit rate threshold, and the video stream includes an unsubscribed second resolution lower than the first resolution, according to the second resolution Obtain the minimum bit rate corresponding to the second resolution and the bit rate threshold, and if the current uplink bit rate is greater than or equal to the sum of the minimum bit rate corresponding to the second resolution and the bit rate threshold, send a notification to the subscription device Send a video stream corresponding to the second resolution, where the condition for switching from the first resolution to the second resolution is determined by the lowest bit rate of the second resolution and the switching threshold, and the corresponding lowest bit rate And the switching threshold dynamically adjusts the sending conditions of the first resolution and the second resolution, so that the switching between video streams of different resolutions is no longer based on the lowest bit rate of each resolution, so that the resolution of the The control of inter-switching helps to reduce the frequent switching of video streams of different resolutions caused by the influence of the uplink bit rate, thereby reducing the transmission of key frames, reducing the occupation of excessive uplink bandwidth, and realizing the comprehensive use of operating resources. It also guarantees a good subscription experience for subscribers.

In order to facilitate the understanding of the present disclosure, some example embodiments of the present disclosure will be described below.

The first exemplary embodiment of the present disclosure:

Based on the first embodiment of the present disclosure, the video transmission method further includes:

When it is detected that the current uplink bit rate is updated, and the video stream has been sent to the subscribing device at the last moment, obtain the lowest bit rate and bit rate threshold corresponding to the first resolution of the video stream subscribed by the subscribing device .

In the embodiment of the present disclosure, the video transmission device detects the total bit rate of the uplink interface in real time, that is, the uplink bit rate to ensure the quality of the video stream sent to the subscription device. The video transmission device detects that the current When the uplink bit rate is updated, and the video stream has been sent to the subscription device at the last moment, the update condition can be set according to the actual situation, for example, the uplink bit rate of this time may be higher than the uplink code of the last time. Rate has changed, or this time the uplink bit rate has changed more than the previous uplink bit rate than the preset amplitude threshold, etc., the current video transmission device reconfirms all the data that can be sent according to the currently updated uplink bit rate. Regarding the resolution of the video stream, the subscribing device can subscribe to a video stream of one resolution level, or it can subscribe to multiple video streams of different resolution levels. When the subscribing device subscribes to a video stream of a resolution level, If the allocated transmission bit rate is 0, the current allocable bit rate is equal to the current uplink bit rate; when the video transmission device subscribes to multiple video streams of different resolution levels, the video transmission device subscribes to the lowest level of the subscription. A resolution starts and ends with the first resolution of the highest level subscribed. It traverses all the first resolutions subscribed by the subscription device from low to high, and the current allocable bit rate is the The difference between the uplink code rate and the transmission code rate. If the current traversal is the first resolution of the subscriber, the transmission code rate is 0, and the current allocable code rate is equal to the uplink code rate. Code rate, if the first resolution with a lower level may have been traversed before the first resolution is traversed and the corresponding transmission code rate has been determined, then the current allocable code rate is the same as the uplink code rate If the difference between the transmission bitrates, the video transmission device obtains the lowest bitrate and the bitrate threshold corresponding to the first resolution of the video stream subscribed by the subscription device, and the current allocable bitrate is the uplink The difference between the bit rate and the transmission bit rate, the video transmission device determines the magnitude relationship between the current allocable bit rate and the lowest bit rate corresponding to the first resolution and the difference between the bit rate threshold, and if the current allocable bit rate is The bit rate is greater than or equal to the difference between the lowest bit rate corresponding to the first resolution and the bit rate threshold, the video transmission device still determines the transmission bit rate according to the lowest bit rate corresponding to the first resolution, and The transmission code rate sends the video stream corresponding to the first resolution to the subscription device.

In the embodiment of the present disclosure, when the uplink bit rate is low, when the video transmission device switches down from the subscribed first resolution to the non-subscribed second resolution, it needs to satisfy that the current allocable bit rate is less than The difference between the lowest bit rate corresponding to the first resolution and the corresponding switching threshold. When the uplink bit rate is high, the video transmission device switches upwards from the second resolution to the subscribed first resolution. It is satisfied that the current allocable code rate is greater than or equal to the sum of the minimum code rate corresponding to the first resolution and the corresponding switching threshold, so that even if the uplink code rate fluctuates near the minimum code rate, as long as the amplitude of the fluctuation does not exceed The switching threshold is 2 times, and it will not switch frequently, thereby avoiding occupying too much upstream bandwidth and ensuring the transmission efficiency of the video stream.

The second exemplary embodiment of the present disclosure:

Based on the first exemplary embodiment of the present disclosure, the video transmission method further includes:

If the current allocable bit rate is less than the difference between the lowest bit rate corresponding to the first resolution and the bit rate threshold, determine whether the video stream includes an unsubscribed second resolution lower than the first resolution rate.

If the video stream includes an unsubscribed second resolution lower than the first resolution, obtain the lowest bit rate and the bit rate threshold of the second resolution according to the second resolution.

In the embodiment of the present disclosure, the current allocable bit rate is the difference between the uplink bit rate and the transmission bit rate, and the video transmission device determines that the current allocable bit rate corresponds to the lowest value of the first resolution. The relationship between the size of the difference between the bit rate and the bit rate threshold. If the current allocable bit rate is less than the minimum bit rate corresponding to the first resolution and the difference between the bit rate threshold, and the video stream includes a bit rate lower than When the second resolution of the first resolution is not subscribed, the lowest bit rate and the bit rate threshold of the second resolution are acquired according to the second resolution, and the video transmission device determines that the current allocable bit rate is the same as the The relationship between the minimum bit rate corresponding to the second resolution and the sum of the bit rate threshold. If the current allocable bit rate is greater than or equal to the sum of the minimum bit rate corresponding to the second resolution and the bit rate threshold, The video transmission device determines the transmission bit rate according to the lowest bit rate corresponding to the second resolution, and sends the video stream corresponding to the second resolution to the subscription device at the transmission bit rate; The assignable bit rate is less than the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, then the video transmission device does not send the video stream.

In the embodiment of the present disclosure, for example, the video transmission device sets a total of 4 resolution levels of 180P, 360P, 720P, and 1080P. The minimum bit rate required to set a video stream with a resolution of 180P is 30k, and the corresponding switching threshold is 0K; The minimum bit rate required for a 360P resolution video stream is 200k, and the corresponding switching threshold is 50K; the minimum bit rate required for a 720P resolution video stream is 600k, and the corresponding switching threshold is 100K; the 1080P resolution video stream requires The minimum bit rate is 800k, and the corresponding switching threshold is 150K; for example, the subscribing device subscribes to the video transmission device for 180P-level and 720P-level video streams, at time t0, the upstream bit rate of the video transmission device as the video publishing source It is 20k, traverses all the first resolutions from low to high, first traverses the first resolution of 180P, due to the current assignable bit rate, the current uplink bit rate is less than the lowest bit rate corresponding to the first resolution of 180P and switch The sum of the thresholds is 20k<30k. Therefore, the transmission code rate is not determined for the first resolution of 180P. Since there is no second resolution lower than the level of the first resolution of 180P, the downward switching condition is not met and the end is over. At time t1, the upstream bit rate of the video transmission device as the video publishing source is updated to 30k. All first resolutions are traversed from low to high, and the first resolution of 180P is traversed first. Since the current bit rate can be allocated, it is now The uplink bit rate meets the sum of the minimum bit rate corresponding to the first resolution greater than or equal to 180P and the switching threshold, 30k≥30k, so the transmission bit rate is determined for the first resolution of 180P, and the determined minimum bit rate is 30k, the remaining current assignable code rate is the difference between the uplink code rate and the transmission code rate, that is, the remaining current assignable code rate is 0, end. At t2, the upstream bit rate of the resolution video transmission device as the video publishing source is updated to 400k, traversing all the first resolutions from low to high, and first traversing the first resolution of 180P. Because of the current allocable bit rate, The uplink bit rate at the moment meets the sum of the minimum bit rate corresponding to the first resolution greater than or equal to 180P and the switching threshold, 400k≥30k, so the transmission bit rate is determined for the first resolution of 180P, and the determined transmission bit rate The minimum is 30k, the remaining current allocable bit rate is 370K (400K-30K=370K), continue to traverse, take the first resolution of the next subscribed 720P, because the current allocable bit rate is less than the first resolution of 720P The sum of the corresponding minimum bit rate and switching threshold is 370k<750k. Therefore, the transmission bit rate is not determined for the first resolution of 720P. The following judges whether the down-switching conditions are met: Determine the non-subscribed second resolution of 360P, no allocation Over the bit rate, and the current allocable bit rate meets the minimum bit rate and switching threshold corresponding to the second resolution greater than or equal to 360P, 370k ≥ 300k, so the second resolution of 360P meets the down-switching condition, giving 360P The transmission code rate is determined by the second resolution, and the video stream corresponding to the second resolution is sent to the subscription device at the transmission code rate. At t3, the upstream bit rate of the video transmission device as the video distribution source is updated to 800k, traversing all the first resolutions from low to high, first traversing the first resolution of 180P, because the current bit rate can be allocated, that is The uplink bit rate meets the sum of the minimum bit rate corresponding to the first resolution greater than or equal to 180P and the switching threshold, and 800k≥30k. Therefore, the transmission bit rate is determined for the first resolution of 180P, and the determined minimum bit rate is 30k, the remaining current allocable code rate is 770K (800K-30K=770K), continue to traverse, and take the first resolution of the next subscribed 720P, because the current allocable code rate meets the treatment or is equal to the first resolution of 720P The sum of the lowest bit rate corresponding to the data rate and the switching threshold, therefore, the transmission bit rate is determined for the first resolution of 720P, and the video stream corresponding to the first resolution is sent to the subscription device at the transmission bit rate, After the traversal is over, return.

In the embodiments of the present disclosure, it should be noted that each resolution of the video transmission device is set with the highest bit rate corresponding to the resolution, for example, the resolution video transmission device is set to 180P, 360P, 720P, 1080P There are 4 resolutions in total. The minimum bit rate corresponding to the 180P resolution is 30k, the highest bit rate is 200K, and the corresponding switching threshold is 0K; the 360P resolution corresponds to the minimum bit rate of 200k and the highest bit rate of 700K, corresponding The switching threshold is 50K; the resolution of 720P corresponds to the lowest bit rate of 600k, the highest bit rate is 1800K, and the corresponding switching threshold is 100K; the resolution of 1080P corresponds to the lowest bit rate of 800k and the highest bit rate of 3000K, corresponding to the switch The threshold is 150K; for example, the subscription device subscribes to the video transmission device for 360P-level and 720P-level video streams, at t0, the upstream bit rate of the resolution video transmission device as the video publishing source is 600k, traversing from low to high For all first resolutions, first traverse the first resolution of 360P. Because the current assignable bit rate, that is, the uplink bit rate at this moment meets the sum of the minimum bit rate corresponding to the first resolution greater than or equal to 360P and the switching threshold, 600k ≥250k, so determine the transmission code rate for the first resolution of 360P, and the determined transmission code rate is at least 200k, and the remaining current assignable code rate is 400K (600K-200K=400K), continue to traverse, and take the next one The subscribed first resolution of 720P, because the current allocable bit rate is less than the sum of the lowest bit rate corresponding to the first resolution of 720P and the switching threshold, 400k<750k, so the transmission bit rate is not determined for the first resolution of 720P , The following judge whether the down-switching conditions are met: Determine the non-subscribed second resolution 180P, no bit rate has been allocated, and the current allocable bit rate meets the minimum bit rate and switching threshold corresponding to the second resolution greater than or equal to 180P The sum is 400k≥30k, so the second resolution of 180P satisfies the down-switching condition, and 400K≥200k, according to the highest bit rate of the second resolution of 180P, determine the transmission rate for the second resolution of 180P, and the remaining The bit rate is no longer allocated, and the video stream corresponding to the second video level is sent to the subscriber at the transmission bit rate. It should be noted that each resolution setting of the resolution video transmission device There is the highest bit rate corresponding to the resolution, which represents the maximum allowable bit rate of the resolution. The transmission bit rate determined by the resolution video transmission device for any resolution cannot be greater than the highest bit rate of the resolution. The assignable code rate is greater than the determined highest code rate of one of the resolutions, then the transmission code rate is determined according to the highest code rate of the resolution, and the remaining code rates are no longer allocated.

In the third exemplary embodiment of the present disclosure:

On the basis of any of the above embodiments, the video transmission method further includes:

In the embodiment of the present disclosure, in the video transmission device as a video source publisher, the video stream is set with several resolutions. For example, the video stream is set with 4 resolution levels, namely 180p, 360p, 720p and 1080p, etc., the subscribing device will subscribe the desired video stream to the video transmission device as the publisher of the video source. When subscribing to the video transmission device, the subscriber needs to carry resolution information to inform the The video transmission device itself expects to receive the resolution. After receiving the video subscription information of the subscription device, the video transmission device obtains the first resolution of the subscribed video stream included in the video subscription information, and then according to the The first resolution expected by the subscribing device determines the video stream sent.

Referring to FIG. 2, a second embodiment of the present disclosure provides a video transmission device, including:

The video subscription information obtaining unit 21 is configured to obtain the video subscription information of the subscribing device when it is detected that the current uplink bit rate is updated and the subscribed video stream of the first resolution is not sent to the subscribing device at the previous moment; wherein, The video subscription information includes the first resolution of the subscribed video stream.

The first code rate parameter determining unit 22 is configured to obtain the minimum code rate corresponding to the first resolution and the code rate threshold according to the first resolution.

The first video stream sending unit 23 is configured to, if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, send to the subscribing device corresponding to the first Resolution of the video stream.

The second bit rate parameter determination unit 24 is configured to: if the current uplink bit rate is less than the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream includes a bit rate lower than the first When the second resolution of the resolution is not subscribed, the lowest bit rate and the bit rate threshold corresponding to the second resolution are obtained according to the second resolution.

The second video stream sending unit 25 is configured to, if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, to the subscribing device corresponding to the second Resolution of the video stream.

In the first implementation manner of the second embodiment, the first video stream sending unit 23 includes:

The first transmission code rate determination module is configured to, if the current allocable code rate is greater than or equal to the sum of the lowest code rate corresponding to the first resolution and the code rate threshold, according to the lowest code rate corresponding to the first resolution The rate determines the transmission bit rate.

In a second implementation manner of the second embodiment, the second video stream sending unit 25 includes:

The second transmission code rate determining unit is configured to, if the current allocable code rate is greater than or equal to the sum of the lowest code rate corresponding to the second resolution and the code rate threshold, according to the lowest code rate corresponding to the second resolution The rate determines the transmission bit rate.

According to the first implementation manner or the second implementation manner of the second embodiment, in the third implementation manner of the second embodiment, the currently allocatable code rate is the uplink code rate and the transmission code rate Difference.

According to the third implementation manner of the second embodiment, in the fourth implementation manner of the second embodiment, the method further includes:

The third bit rate parameter determination module is used to obtain the video subscribed by the subscribing device when the current uplink bit rate update is detected and the video stream of the first resolution has been sent to the subscribing device at the last moment The lowest bit rate and the bit rate threshold corresponding to the first resolution of the stream.

According to the fourth implementation manner of the second embodiment, in the fifth implementation manner of the second embodiment, the method further includes:

The second resolution determining module is configured to determine whether the video stream includes a bit rate lower than the first bit rate if the current allocable bit rate is less than the minimum bit rate corresponding to the first resolution and the bit rate threshold. The second resolution of the unsubscribed resolution.

The fourth code rate parameter determination module is configured to, if the video stream includes an unsubscribed second resolution lower than the first resolution, obtain the lowest code of the second resolution according to the second resolution Rate and bit rate threshold.

According to any of the foregoing implementation manners of the second embodiment, in the sixth implementation manner of the second embodiment, the method further includes:

It should be noted that the device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physically separate. Units can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments. In addition, in the drawings of the device embodiments provided by the present disclosure, the connection relationship between the modules indicates that they have a communication connection between them, which can be implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without creative work.

Refer to FIG. 3, which is a schematic diagram of a video transmission device provided by a third embodiment of the present disclosure. The video transmission device of this embodiment includes: at least one processor 11, such as a CPU, at least one network interface 14 or other user interface 13, a memory 15, at least one communication bus 12, and the communication bus 12 is used to implement communication between these components. Connect communication. The user interface 13 may include a USB interface and other standard interfaces and wired interfaces. The network interface 14 may include a Wi-Fi interface and other wireless interfaces. The memory 15 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 15 may include at least one storage device located far away from the aforementioned processor 11.

In some embodiments, the memory 15 stores the following elements, executable modules or data structures, or their subsets, or their extended sets:

The operating system 151, including various system programs, is used to implement various basic services and process hardware-based tasks;

Procedure 152.

In an implementation manner, the processor 11 is configured to call the program 152 stored in the memory 15 to execute the video transmission method described in the foregoing embodiment, for example, step S11 shown in FIG. 1. Alternatively, when the processor executes the computer program, the function of each module/unit in the above-mentioned device embodiments, such as a video subscription information receiving unit, is realized.

Exemplarily, the computer program may be divided into one or more modules/units, and the one or more modules/units are stored in the memory and executed by the processor to complete the present disclosure. The one or more modules/units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the video transmission device.

The video transmission device may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The video transmission device may include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the schematic diagram is only an example of the video transmission device, and does not constitute a limitation on the video transmission device. It may include more or less components than those shown in the figure, or combine certain components. , Or different parts.

The so-called processor 11 may be a central processing unit (Central Processing Unit, CPU), other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Ready-made programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The processor 11 is the control center of the video transmission equipment, and various interfaces and lines are used to connect each of the entire video transmission equipment. section.

The memory 15 may be used to store the computer program and/or module, and the processor 11 executes or executes the computer program and/or module stored in the memory 15 and calls data stored in the memory to achieve Various functions of the video transmission device. The memory may mainly include a program storage area and a data storage area. The program storage area may store an operating system, an application program required by at least one function, and the like; the data storage area may store data created according to the use of a mobile phone. In addition, the memory 15 may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), and a Secure Digital (SD) Card, Flash Card, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.

The fourth embodiment of the present disclosure provides a computer-readable storage medium. If the integrated module/unit of the video transmission device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer Read the storage medium. Based on this understanding, the present disclosure implements all or part of the processes in the above-mentioned embodiments and methods, and can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the program is executed by the processor, it can implement the steps of the foregoing method embodiments. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file, or some intermediate forms. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electrical carrier signal, telecommunications signal, and software distribution media, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased in accordance with the requirements of the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to the legislation and patent practice, the computer-readable medium Does not include electrical carrier signals and telecommunication signals.

Claims

A video transmission method includes the following steps:

When it is detected that the current uplink bit rate is updated, and the subscribed video stream of the first resolution is not sent to the subscribing device at the last moment, the video subscription information of the subscribing device is acquired; wherein the video subscription information includes the subscribed video The first resolution of the stream;

Acquiring, according to the first resolution, the lowest bit rate and the bit rate threshold corresponding to the first resolution;

If the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, sending a video stream corresponding to the first resolution to the subscription device;

If the current uplink bit rate is less than the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream includes an unsubscribed second resolution lower than the first resolution , Obtaining the lowest bit rate and the bit rate threshold corresponding to the second resolution according to the second resolution;

If the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, sending the video stream corresponding to the second resolution to the subscription device.
The video transmission method according to claim 1, wherein if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, the first resolution Sending the video stream to the subscription device includes:

If the current allocable code rate is greater than or equal to the sum of the minimum code rate corresponding to the first resolution and the code rate threshold, determine the transmission code rate according to the minimum code rate corresponding to the first resolution;

Sending a video stream corresponding to the first resolution to the subscription device at the transmission bit rate.
The video transmission method according to claim 1, wherein if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, the corresponding bit rate is sent to the subscription device The video stream at the second resolution includes:

If the current allocable code rate is greater than or equal to the sum of the minimum code rate corresponding to the second resolution and the code rate threshold, determine the transmission code rate according to the minimum code rate corresponding to the second resolution;

Sending a video stream corresponding to the second resolution to the subscription device at the transmission code rate.
The video transmission method according to claim 2 or 3, wherein the current allocable bit rate is the difference between the uplink bit rate and the transmission bit rate.
The video transmission method according to claim 4, further comprising:

When it is detected that the current uplink bit rate is updated, and the video stream of the first resolution has been sent to the subscribing device at the previous moment, obtain the lowest code corresponding to the first resolution of the video stream subscribed by the subscribing device Rate and bit rate threshold;

If the current allocable bit rate is greater than or equal to the difference between the lowest bit rate corresponding to the first resolution and the bit rate threshold, sending the video stream corresponding to the first resolution to the subscription device.
The video transmission method according to claim 5, further comprising:

If the current allocable bit rate is less than the difference between the lowest bit rate corresponding to the first resolution and the bit rate threshold, determine whether the video stream includes an unsubscribed second resolution lower than the first resolution rate;

If the video stream includes an unsubscribed second resolution lower than the first resolution, obtaining the lowest bit rate and the bit rate threshold of the second resolution according to the second resolution;

If the current allocable bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold, sending the video stream corresponding to the second resolution to the subscription device.
The video transmission method according to any one of claims 1 to 6, further comprising:

Receive video subscription information of the subscription device; wherein the video subscription information includes the first resolution of the subscribed video stream.
A video transmission device includes:

The video subscription information obtaining unit is configured to obtain the video subscription information of the subscribing device when it is detected that the current uplink bit rate is updated and the subscribed video stream of the first resolution is not sent to the subscribing device at the previous moment; The video subscription information includes the first resolution of the subscribed video stream;

The first code rate parameter determination unit is configured to obtain the minimum code rate corresponding to the first resolution and the code rate threshold according to the first resolution;

The first video stream sending unit is configured to, if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, send to the subscribing device corresponding to the first resolution Rate of video streaming;

The second bit rate parameter determination unit is configured to: if the current uplink bit rate is less than the sum of the lowest bit rate corresponding to the first resolution and the bit rate threshold, and the video stream includes a bit rate lower than the first resolution When the second resolution is not subscribed to, obtain the lowest bit rate and the bit rate threshold corresponding to the second resolution according to the second resolution;

The second video stream sending unit is configured to send a signal corresponding to the second resolution to the subscription device if the current uplink bit rate is greater than or equal to the sum of the lowest bit rate corresponding to the second resolution and the bit rate threshold. Rate of the video stream.
A video transmission device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. The processor executes the computer program as claimed in claims 1 to 7 The video transmission method described in any one of.
A computer-readable storage medium, the computer-readable storage medium includes a stored computer program, wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any one of claims 1 to 7 The video transmission method described in item.