CN114339426A - Live video encoding and decoding forwarding system - Google Patents
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Abstract
The invention discloses a live video encoding, decoding and forwarding system which comprises a video source switching module, a video content mixing module, a video encoding module and a video recording module, wherein the video content mixing module is in signal connection with the video source switching module, and the video encoding module and the video recording module are in signal connection with the video content mixing module and are used for carrying out video stream processing on video source switching, video content mixing, video encoding and recording related modules. The scheme realizes automatic (or manual) switching of video streams, can avoid pause or interruption of a video picture switching process, and can reduce the requirement of a program director process on hardware; the video content is added, so that the efficiency of the processing process of the video filter is improved; the dynamic frame rate coding of the video is realized, and the playing of the client can be uninterrupted; the video recording is realized, the network bandwidth during the independent recording can be saved, and the performance consumption in the decoding and encoding processes can be reduced.
Description
Technical Field
The invention relates to the technical field of computer application, in particular to a live video encoding and decoding forwarding system.
Background
With the rapid development of informatization and networking, various live videos become visible everywhere; the existing video live broadcast platform generally provides a management platform for a user, the user issues live broadcast activities, push streaming is generally provided by OBS software or a platform side, the content splicing process is basically performed at a push streaming end, the platform side provides a streaming media server and Content Distribution (CDN) services, the platform side performs multi-resolution and multi-protocol support processing on received video streams, and the process uses a video coding and decoding technology; for example, in a live event, different shot pictures need to be switched, a plurality of stream pushing ends push video streams to streaming media, most of the stream pushing ends are camera devices, a viewer only sees one video, different shot video streams are switched and operated by a director, the director generally adopts special software to match with a highly-matched PC (personal computer) for support, an output picture can be mixed with various banners, logo icons and the like for decoration in the picture, and the process can use various complex functions such as video coding and decoding, video mixing, video filters and the like.
Now, because the request of the director to hardware equipment, network is higher, the individual is difficult to provide the director hardware environment, third party's director service will require within 1080P video resolution in the market, and the video restriction inserts the way number simultaneously, when the director high resolution (4K, 8K), require very high to the director end hardware, if do not reduce video resolution, the hardware is difficult to support its normal work, the video picture switching process appears blocking or interrupting easily, but reduce resolution and will reduce the live broadcast real-time, increase system stability risk, influence live broadcast efficiency and effect.
Disclosure of Invention
The invention mainly aims to provide a live video encoding and decoding forwarding system, which aims to solve the problems that in the related technology, in the live video encoding and decoding forwarding process, the requirement on the hardware of a director is very high, the video resolution is high, the video picture switching process is easy to be blocked or interrupted, and when the video resolution is low, the live broadcast real-time performance is reduced, the system stability risk is increased, and the live broadcast efficiency and effect are influenced.
In order to achieve the above object, the present invention provides a live video encoding and decoding forwarding system, including:
the video source switching module, the video content mixing module, the video coding module and the video recording module;
the video content mixing module is in signal connection with the video source switching module, the video source switching module is used for receiving a video source address controlled and switched by a scheduling service instruction, initializing a decoder and replacing the decoder for taking a video frame, the video content mixing module is used for acquiring configuration information, reading image and audio data, processing the configuration information into video frame data, performing mixed flow processing on the video frame data and the video frame data through a video filter, taking out the video frame data from the video filter and storing the video frame data in a cache;
the video coding module and the video recording module are in signal connection with the video content mixing module, the video coding module is used for acquiring configuration information, reading cached video frame data, coding through the coder, pushing a video stream back to streaming media service after coding, and the video recording module multiplexes the coded video frame data through the recorder and directly converts the coded video frame data into a recorded file.
In an embodiment of the present invention, the video source switching module includes a control unit and a decoder unit, the control unit is configured to receive a video source address for controlling switching by a scheduling service instruction, and the decoder unit is configured to initialize a decoder to replace the decoder for fetching a video frame.
In an embodiment of the present invention, the control unit is configured to perform video source switching according to configuration information read by the scheduling server.
In an embodiment of the present invention, the decoder unit reads a video source address according to the scheduling server, and the video codec service acquires the video stream pushed by the stream pushing device from the streaming media service through the video source address, and initializes the decoder.
In an embodiment of the present invention, the video content mixing module includes an obtaining unit and a processing unit, the obtaining unit is configured to obtain configuration information and read image and audio data, and the processing unit is configured to process the information and the data obtained by the obtaining unit into video frame data, perform mixed flow processing with the video frame data through a video filter, take out the video frame data from the video filter, and store the video frame data in a cache.
In an embodiment of the present invention, the obtaining unit is configured to obtain user presets including a live streaming address, a coding configuration, a recording configuration, a mask configuration, and audio configuration information.
In an embodiment of the present invention, the processing unit mixes the video content first, and then stores the processed video frames in the buffer.
In an embodiment of the present invention, the video source switching module is in signal connection with a streaming media server and a stream pushing device, the streaming media server is in signal connection with the video source switching module through stream pulling, and the stream pushing device is in signal connection with the streaming media server through stream pushing.
In an embodiment of the present invention, the video encoding module and the video recording module are in signal connection with the streaming media server through stream pushing.
In one embodiment of the invention, the video encoding module and the video recording module are in signal connection with a file service, and the file service is in signal connection with the video content mixing module by reading.
Compared with the prior art, the invention has the beneficial effects that: when the system is used, firstly, a service provider provides a streaming media server for receiving a live video stream pushed by a stream pushing device, the coding and decoding service receives coding and decoding configuration information sent by a scheduling service, the analysis configuration information carries out video source switching, video content mixing, video coding and video recording related modules for carrying out video stream processing, then, a video source switching module carries out timing or real-time switching on the video source according to instruction information or coding and decoding configuration received from the scheduling service, a video content mixing module reads file content data in the configuration from a content server according to the coding configuration information for carrying out audio and video decoding mixing processing on the live stream, and finally, a video coding module and a video recording module transmit processed video frames to the video coding module according to the coding configuration information, coding the video frames and pushing the video frames to a streaming media server, wherein the video recording module stores the video frames coded according to the configuration information into a file server;
first, automatic (or manual) switching of video streams is achieved: in the switching process, the original decoder can continue to decode, and the target decoder starts to switch after initialization is completed, so that the blockage or interruption of the video picture switching process can be avoided;
secondly, video content addition is realized: the preprocessing process converts the contents of pictures, sounds and the like into video frame which can be directly used by the video filter, and is beneficial to improving the efficiency of the processing process of the video filter;
thirdly, realizing video dynamic frame rate coding: automatically calculating the coding speed, dynamically coding key frames and skip frames according to performance, preventing picture pause or stream pushing interruption caused by too slow coding, automatically pushing default pictures and silent video streams by a decoder when the decoder is interrupted due to network instability, waiting for the decoder to decode again, continuing coding, and enabling the client to play without interruption;
fourthly, video recording is realized: the video frame data coded by the coder is directly used and stored in the file server in real time, so that the network bandwidth during independent recording and the performance consumption in the decoding and coding processes can be saved.
Drawings
Fig. 1 is a schematic view of a video codec service flow of a live video codec forwarding system according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a video source switching module of a live video codec forwarding system according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a video content mixing module of a live video codec forwarding system according to an embodiment of the present invention;
fig. 4 is a schematic view of a video codec service workflow of a live video codec forwarding system according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating a video stream content adding and switching flow of a live video codec forwarding system according to an embodiment of the present invention;
fig. 6 is a schematic view of a main flow of video encoding of a live video codec forwarding system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Referring to fig. 1 to fig. 6, the present invention provides a live video encoding and decoding forwarding system, including:
the video source switching module, the video content mixing module, the video coding module and the video recording module;
the video content mixing module is in signal connection with the video source switching module;
the video source switching module is used for receiving a video source address controlled and switched by a scheduling service instruction, initializing a decoder, replacing the decoder for taking a video frame, and switching the video source in a timing or real-time manner according to instruction information or coding and decoding configuration received from the scheduling service;
the video source switching module comprises a control unit and a decoder unit;
the control unit is used for receiving a video source address for controlling switching by a scheduling service instruction and is used for reading configuration information according to the scheduling server to switch the video source;
the decoder unit is used for initializing a decoder, replacing the decoder for taking the video frame, reading a video source address according to the scheduling server, acquiring a video stream pushed by the stream pushing equipment from the streaming media service through the video source address by the video coding and decoding service, and initializing the decoder;
the video content mixing module is used for acquiring configuration information, reading image and audio data, processing the image and audio data into video frame data, performing mixed flow processing on the video frame data and the video frame data through a video filter, taking the video frame data out of the video filter and storing the video frame data in a cache, reading file content data in the configuration from a content server according to the encoding configuration information, and performing live streaming audio and video decoding and mixing processing;
the video content mixing module comprises an acquisition unit and a processing unit;
the acquisition unit is used for acquiring configuration information, reading image and audio data and acquiring user presets including live broadcast stream pushing addresses, coding configuration, recording configuration, mask image configuration and audio configuration information;
the processing unit is used for processing the information and the data acquired by the acquisition unit into video frame data, performing mixed flow processing on the video frame data and the video frame data through a video filter, taking the video frame data out of the video filter and storing the video frame data in a cache, mixing video contents, and storing the processed video frame in the cache;
the video coding module and the video recording module are in signal connection with the video content mixing module;
the video coding module and the video recording module transmit the processed video frames to the video coding module according to the coding configuration information, code the video frames and push the video frames to the streaming media server, and the video recording module stores the video frames coded according to the configuration information into the file server;
the video coding module is used for acquiring configuration information, reading cached video frame data, coding the cached video frame data through a coder, and pushing a video stream back to the streaming media service after coding;
the video recording module multiplexes the encoded video frame data through a recorder and directly converts the video frame data into a recorded file;
the video source switching module is in signal connection with a streaming media server and stream pushing equipment;
the stream media server is in signal connection with the video source switching module through stream pulling, and the stream pushing equipment is in signal connection with the stream media server through stream pushing;
the video coding module and the video recording module are in signal connection with the streaming media server through stream pushing;
the video coding module and the video recording module are in signal connection with a file service, and the file service is in signal connection with the video content mixing module through reading.
The invention is designed based on an FFMpeg tool, and the tool set is a powerful audio and video tool set and is used for a video encoder, a decoder, a filter and the like in the tool;
the server interaction process comprises the steps that a service provider deploys platform service, file service, coding and decoding scheduling service and coding and decoding service;
the platform provides a live broadcast activity configuration environment for a user, live broadcast related configuration data are stored in the server, a live broadcast watching end obtains a playing address from a platform service, the file server stores uploaded audio and picture related file resources, the coding and decoding scheduling service distributes and forwards coding and decoding messages to an idle coding and decoding server according to coding and decoding messages initiated by the platform, and the coding and decoding server carries out coding and decoding forwarding processes.
Referring to fig. 4, the video codec service workflow includes the following steps:
s1, the scheduling service acquires the live broadcast stream pushing address, coding configuration, recording configuration, mask map configuration and audio configuration information preset by the user from the platform, and forwards the information to the idle coding and decoding service;
s2, the coding and decoding service obtains a video source address according to the coding and decoding information received from the scheduling server, the video coding and decoding service obtains the video stream pushed by the stream pushing equipment from the streaming media service through the video source address, and a decoder is initialized;
s3, the coding and decoding service switches video sources and mixes video contents according to the coding and decoding configuration information and instructions received from the scheduling service, and stores the processed video frames into a cache;
s4, the coding and decoding service starts a video recorder and a video encoder group according to the coding and decoding configuration information received from the scheduling service, and the encoder takes out a video frame from the buffer for encoding processing;
and S5, when the video stream is pushed back to the streaming media server, the video file generated by the recorder is pushed to the file server, and the recorder and the decoder are also ended when the coding is ended.
Referring to fig. 5, the video stream content adding and switching process includes the following steps:
s1, acquiring a video stream address according to the coding and decoding configuration information, and acquiring a video stream from the streaming media server;
s2, initializing and initializing a video decoder according to the video stream;
s3, judging whether video stream switching processing is needed according to the coding and decoding configuration information or the scheduling instruction information, and if the video stream needs to be replaced, switching the video stream through the video source switching module;
s4, judging whether video content mixing processing is needed according to the coding and decoding configuration information, if so, loading related file streams from a content server through a content adding module, and performing video frame mixing processing;
s5, distributing the obtained video frame data to each encoder video frame data buffer queue to wait for subsequent processing;
after the process is finished, waiting for the video frames in the buffer queue to be completely processed, and then repeatedly executing subsequent steps from S3 until the encoder receives an encoding finishing instruction;
the following scenario will set the pull state to "failed": if an interruption occurs during the process of fetching the video stream, the execution will be retried from S1; if the reading of the live video stream fails at S1, the process of S1-S4 will be retried continuously until the reading is successful.
Referring to fig. 6, the main process of video encoding includes the following steps:
s1, initializing one or more video coding flows according to the coding and decoding configuration information, wherein each flow occupies one thread;
s2, creating default audio and image frame data which can be defined by self, wherein the default audio and the image are both required to be decoded into video frame data which can be used directly;
s3, judging whether video recording is needed according to the coding configuration information, and if the video recording is configured, initializing a recorder;
s4, judging whether the buffer queue has video frame data or not, and if so, taking out the video frame data from the video frame buffer queue;
s5, transmitting the video frame data into an encoder for video encoding;
s6, the encoder generates video frame data;
s7, judging whether recording is needed or not according to the coding configuration information, if recording is configured, transmitting the coded video frame data into a recorder, and the recorder generates a video file and stores the video file in a file server in real time;
after the process is finished, the subsequent process of S4 is repeated, before the process of S4 is executed, whether the pull stream state is 'failure' or not is judged, if the pull stream state is 'failure', the pull stream state is directly replaced by a default audio/video frame, the pull stream state is taken from the buffer queue until the state is not 'failure', and when a scheduled stop coding instruction is received, the encoder and the recorder are stopped.
Specifically, the working principle of the live video encoding and decoding forwarding system is as follows: when in use, firstly, a service provider provides a streaming media server for receiving a live video stream pushed by a stream pushing device, an encoding and decoding service receives encoding and decoding configuration information sent by a scheduling service, the encoding and decoding configuration information is analyzed to perform video source switching, video content mixing, video encoding and video stream processing by a relevant module, then, the video source switching module carries out timing or real-time switching on the video source according to instruction information or coding and decoding configuration received from the scheduling service, the video content mixing module reads file content data in the configuration from the content server according to the coding configuration information and carries out live streaming audio and video decoding and mixing processing, finally, the video coding module and the video recording module transmit processed video frames to the video coding module according to the coding configuration information and code and push the video frames to the streaming media server, and the video recording module stores the video frames coded according to the configuration information into the file server.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A live video encoding and decoding forwarding system is characterized by comprising:
the video source switching module, the video content mixing module, the video coding module and the video recording module;
the video content mixing module is in signal connection with the video source switching module, the video source switching module is used for receiving a video source address controlled and switched by a scheduling service instruction, initializing a decoder and replacing the decoder for taking a video frame, the video content mixing module is used for acquiring configuration information, reading image and audio data, processing the configuration information into video frame data, performing mixed flow processing on the video frame data and the video frame data through a video filter, taking out the video frame data from the video filter and storing the video frame data in a cache;
the video coding module and the video recording module are in signal connection with the video content mixing module, the video coding module is used for acquiring configuration information, reading cached video frame data, coding through the coder, pushing a video stream back to streaming media service after coding, and the video recording module multiplexes the coded video frame data through the recorder and directly converts the coded video frame data into a recorded file.
2. The system as claimed in claim 1, wherein the video source switching module comprises a control unit and a decoder unit, the control unit is configured to receive a video source address for controlling switching by a scheduling service command, and the decoder unit is configured to initialize a decoder to replace a decoder for fetching a video frame.
3. The system as claimed in claim 2, wherein the control unit is configured to perform video source switching according to the configuration information read by the scheduling server.
4. The system as claimed in claim 2, wherein the decoder unit reads a video source address according to the scheduling server, and the video codec service obtains the video stream pushed by the stream pushing device from the streaming service via the video source address to initialize the decoder.
5. The system as claimed in claim 1, wherein the video content mixing module includes an obtaining unit and a processing unit, the obtaining unit is configured to obtain the configuration information and read the image and audio data, the processing unit is configured to process the information and data obtained by the obtaining unit into video frame data, mix the video frame data with the video frame data through a video filter, take out the video frame data from the video filter and store the video frame data in the buffer.
6. The system as claimed in claim 5, wherein the obtaining unit is configured to obtain user presets including live streaming address, coding configuration, recording configuration, mask configuration, and audio configuration information.
7. The system as claimed in claim 5, wherein the processing unit mixes the video content first and stores the processed video frames in the buffer.
8. The system as claimed in claim 1, wherein the video source switching module is in signal connection with a streaming media server and a stream pushing device, the streaming media server is in signal connection with the video source switching module through a stream pulling, and the stream pushing device is in signal connection with the streaming media server through a stream pushing.
9. The system as claimed in claim 8, wherein the video encoding module and the video recording module are connected to the streaming media server via push streaming.
10. A live video codec forwarding system as claimed in claim 1, wherein the video encoding module and the video recording module are in signal connection with a file service, and the file service is in signal connection with the video content mixing module by reading.
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