CN117750138A - Control method and system for double-speed playing of video monitoring on-demand file - Google Patents
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Abstract
The invention relates to the technical field of video monitoring, and provides a control method for double-speed playing of video monitoring on-demand files, which comprises the following steps: s1: the service end issues a speed doubling control command to the FFmpeg library; s2: the FFmpeg library analyzes the received double-speed control command, adjusts the double speed of the on-demand file of the monitoring video to be played according to the double-speed parameter in the double-speed control command, and returns the task execution state to the service end; s3: the FFmpeg library pushes the on-demand file with the speed adjusted to the streaming media server; s4: the service end requests stream pulling to the stream media server, and the stream media server returns the on-demand file to the service end in a video transmission mode. The technical scheme effectively solves the problem that the playing end consumes CPU resources in a mode that the service end directly uses video transparent transmission, and increases the multi-channel concurrency quantity of the playing end. The realization of the function of double-speed playing control is placed at the server side and is pushed to the streaming media in the form of stream, so that the multi-user remote stream pulling playing can be supported.
Description
Technical Field
The invention relates to the technical field of video monitoring, in particular to a double-speed playing control of video monitoring on-demand files, and specifically relates to a control method and a system for double-speed playing of video monitoring on-demand files.
Background
In a video monitoring system, the double-speed play function refers to a characteristic that can speed up or slow down the video playback speed. This feature is useful for fast looking at video recordings, fast locating key events, or slow playback to more carefully examine details, etc. The double-speed playing can improve the efficiency of the monitoring system, and allow a user to manage and analyze video data more flexibly.
In the prior art, a video monitoring system mainly takes a video frame queue by a client in a video decoding mode, sequentially takes each frame from the frame queue, judges whether the display time is reached by comparing display time stamps pts of the video frames, and renders the frame data in a player if the display time is reached. The display time in the player can be changed by changing the presentation timestamp pts value of the video frame, thereby controlling the playing speed. For the audio frames, the audio frame pair is also obtained through decoding, each frame is taken out in sequence, and then the sampling point of the audio is changed through a resampling technology, so that the playing speed at the playing end is changed.
The existing double-speed playing function is mainly realized at a service end serving as a playing end, so that the following problems exist:
(1) The function is realized by decoding at the playing end, which increases the consumption of CPU resources at the playing end.
(2) Decoding at the playback end is difficult to achieve multiple concurrency.
(3) Remote multicast playback by multiple users is not supported.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a control method and a system for double-speed playing of video monitoring on-demand files, which effectively solve the problem that the playing end consumes CPU resources in a mode of directly using video transmission by a service end serving as the playing end and increase the multi-channel concurrence quantity of the playing end. The realization of the function of double-speed playing control is placed at the server side and is pushed to the streaming media in the form of stream, so that the multi-user remote stream pulling playing can be supported.
The above object of the present invention is achieved by the following technical solutions:
a control method for double-speed playing of video monitoring on-demand files comprises the following steps:
s1: the service end where the player is located issues a double-speed control command to the FFmpeg library of the service end, and double-speed parameters to be controlled are transmitted through the double-speed control command;
s2: the FFmpeg library executes the task of adjusting the double speed of the on-demand file of the monitoring video to be played according to the double speed parameter in the double speed control command, and returns the task execution state to the service end;
s3: the FFmpeg library pushes the on-demand file with the speed adjusted to a streaming media server;
s4: the service end requests the streaming media server to pull streaming, and the streaming media server returns the on-demand file to the service end in a video transparent transmission mode.
Further, before step S1, the method further includes:
and the service end starts the FFmpeg library through a command line, and the FFmpeg library is used for reading and processing the on-demand file and pushing the on-demand file to the streaming media server.
Further, in step S1, the method further includes:
a monitoring thread is arranged on the FFmpeg library of the server side, and the monitoring thread is used for monitoring instructions from the service side;
after monitoring the instruction from the service end, the monitoring thread returns a response message to the service end to inform the service end that the instruction from the service end is successfully received.
Further, in step S2, the double speed of the on-demand file of the monitoring video to be played is adjusted according to the double speed parameter in the double speed control instruction, which specifically includes:
s21: reading each frame in the on-demand file according to the time stamp of each frame in the on-demand file;
s22: when the read current frame is a video frame, adjusting a video timestamp value of the video frame according to the speed doubling parameter;
s23: when the current frame is read as an audio frame, resampling the audio frame according to the speed-doubling parameter;
s24: and synchronizing the video frames and the audio frames in the on-demand file in a mode of adjusting output time stamps according to the change of the speed-doubling parameters.
Further, in step S21, each frame in the on-demand file is read according to the timestamp of each frame in the on-demand file, specifically:
when the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, comparing a timestamp pts of the current frame with a program running time now, when the timestamp pts > the program running time now, indicating that the current frame is not yet read, returning a program, and when the timestamp pts < = the program running time now, reading the current frame;
when the FFmpeg library receives the double speed control command and the double speed parameter in the double speed control command is not 1, dividing the time stamp pts by a double speed to obtain a time stamp pts ', namely pts' =pts/speed, adding the time stamp pts 'to a program, and obtaining a program running time now' from the accumulated execution time now2, namely now '=pts' +now2, when the time stamp pts '> the program running time now' indicates that the time for reading the current frame is not yet reached, returning the program, and when the time stamp pts '<=the program running time now', reading the current frame.
Further, in step S22, when the read current frame is the video frame, the video timestamp value of the video frame is adjusted according to the multiple speed parameter, specifically:
when the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, the frame interval duration value of the video frame is unchanged, and the video timestamp value dts of the output video frame=the video timestamp value dts of the last frame+the frame interval duration value;
when the FFmpeg library receives the double-speed control command and the double-speed parameter in the double-speed control command is not 1, calculating a frame interval duration value=original frame interval duration/double-speed of the video frame, wherein the video timestamp value dts of the output video frame=the video timestamp value dts of the last frame+the frame interval duration value.
Further, in step S23, when the read current frame is the audio frame, resampling the audio frame according to the multiple speed parameter is specifically:
when the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, decoding the audio frame, calling an atempo filter, updating a value in the atempo filter for controlling the double speed of the audio frame, namely, tempo=1, changing a state value in the atempo filter into a read state, reloading a data packet of the audio frame, resampling the audio frame, and encoding and outputting;
when the FFmpeg library receives the double-speed control command and the double-speed parameter in the double-speed control command is not 1, decoding the audio frame, calling the atempo filter, updating a value in the atempo filter for controlling the double speed of the audio frame, namely, tempo=double-speed, changing a state value in the atempo filter into a reload state, reloading a data packet of the audio frame, resampling the audio frame, and encoding and outputting.
A control system for double-speed playing of video-on-demand files for performing the control method for double-speed playing of video-on-demand files for video monitoring as described above, comprising:
the control command issuing module is used for issuing a double-speed control command to the FFmpeg library of the server side by the service side where the player is located, and transmitting double-speed parameters to be controlled through the double-speed control command;
the speed doubling task processing module is used for providing the FFmpeg library with a task for executing the task of adjusting the speed doubling of the video-on-demand file of the monitoring video to be played according to the speed doubling parameter in the speed doubling control command and returning the task execution state to the service end;
the FFmpeg library push streaming module is used for providing the FFmpeg library with push streaming of the on-demand file with the speed adjusted to a streaming media server;
and the service request stream pulling module is used for providing the service end with a request stream pulling to the streaming media server, and the streaming media server returns the on-demand file to the service end in a video transmission mode.
A computer device comprising a memory and one or more processors, the memory having stored therein computer code which, when executed by the one or more processors, causes the one or more processors to perform a method as described above.
A computer readable storage medium storing computer code which, when executed, performs a method as described above.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) The control method for double-speed playing of the video monitoring on-demand file comprises the following steps: s1: the service end where the player is located issues a double-speed control command to the FFmpeg library of the service end, and double-speed parameters to be controlled are transmitted through the double-speed control command; s2: the FFmpeg library executes the task of adjusting the double speed of the on-demand file of the monitoring video to be played according to the double speed parameter in the double speed control command, and returns the task execution state to the service end; s3: the FFmpeg library pushes the on-demand file with the speed adjusted to a streaming media server; s4: the service end requests the streaming media server to pull streaming, and the streaming media server returns the on-demand file to the service end in a video transparent transmission mode. According to the technical scheme, the step of performing double-speed playing processing on the video monitoring on-demand file is placed on the FFmpeg library of the server, the processed on-demand file is directly pushed to the streaming media server, the service end directly reads the on-demand file on the streaming media server in a video transmission mode, the resource consumption of a CPU (Central processing Unit) serving as the service end of the playing end is reduced, and the concurrency quantity of multiple on-demand files of the playing end can be increased.
(2) The processed on-demand file is directly pushed to the streaming media server, so that the service of simultaneously and remotely pulling the on-demand file by multiple users can be supported, and the double-speed control of hundreds of channels of monitoring video streams can be simultaneously supported through experiments.
Drawings
FIG. 1 is a flowchart illustrating a method for controlling double-speed playing of video-on-demand files according to the present invention;
FIG. 2 is a block diagram of a control method for double-speed playing of video-on-demand files according to the present invention;
FIG. 3 is a chart showing the control of the double speed in the control method for double speed playing of video monitoring on-demand files according to the present invention;
fig. 4 is an overall structure diagram of a control system for double-speed playing of video-on-demand files according to the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
First embodiment
As shown in fig. 1-3, the present embodiment provides a control method for double-speed playing of video monitoring on-demand files, which includes the following steps:
s1: and the service end where the player is located transmits a double-speed control command to the FFmpeg library of the service end, and the double-speed parameter to be controlled is transmitted through the double-speed control command.
Specifically, in this embodiment, the manner of processing the on-demand file in the FFmpeg library disposed at the server side is used to replace the original manner of processing the on-demand file at the service side where the player is located. And issuing a double-speed control command to an FFmpeg library of a server by a player, wherein the FFmpeg library is started by the service end through a command line and is used for reading and processing the on-demand file and pushing the on-demand file to the streaming media server.
Meanwhile, a monitoring thread is arranged on the FFmpeg library of the service end, the monitoring thread is used for monitoring instructions from the service end, and after the instructions from the service end are monitored, the monitoring thread returns a response message to the service end to inform that the service end has successfully received the instructions from the service end.
In addition, the invention does not limit the communication mode between the service end and the service end. In this embodiment, the http interface communication may be used.
S2: and the FFmpeg library executes the task of adjusting the double speed of the on-demand file of the monitoring video to be played according to the double speed parameter in the double speed control command, and returns the task execution state to the service end.
In step S2, the double speed of the on-demand file of the monitoring video to be played is adjusted according to the double speed parameter in the double speed control instruction, specifically:
s21: and reading each frame in the on-demand file according to the time stamp of each frame in the on-demand file.
When the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, comparing a timestamp pts of the current frame with a program running time now, when the timestamp pts > the program running time now, indicating that the current frame is not yet read, returning a program, and when the timestamp pts < = the program running time now, reading the current frame;
when the FFmpeg library receives the double speed control command and the double speed parameter in the double speed control command is not 1, dividing the time stamp pts by a double speed to obtain a time stamp pts ', namely pts' =pts/speed, adding the time stamp pts 'to a program, and obtaining a program running time now' from the accumulated execution time now2, namely now '=pts' +now2, when the time stamp pts '> the program running time now' indicates that the time for reading the current frame is not yet reached, returning the program, and when the time stamp pts '<=the program running time now', reading the current frame.
S22: and when the read current frame is a video frame, adjusting the video timestamp value of the video frame according to the speed doubling parameter.
The realization of double-speed reading and monitoring of the video on demand file is a premise that a playing end can play at double speed, and the value of the frame interval duration needs to be changed for video.
When the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, the frame interval duration value of the video frame is unchanged, and the video timestamp value dts of the output video frame=the video timestamp value dts of the last frame+the frame interval duration value;
when the FFmpeg library receives the double-speed control command and the double-speed parameter in the double-speed control command is not 1, calculating a frame interval duration value=original frame interval duration/double-speed of the video frame, wherein the video timestamp value dts of the output video frame=the video timestamp value dts of the last frame+the frame interval duration value.
S23: and when the current frame is read as an audio frame, resampling the audio frame according to the speed-doubling parameter.
The atempo filter is an FFmpeg self-contained filter, mainly uses resampling technology, and changes the sampling rate of the audio by inserting or deleting sampling points, so that the double-speed adjusting function of the audio is realized. And deleting some sampling points when the double speed becomes larger, and inserting some sampling points when the double speed becomes smaller so as to control the playing speed of the audio. Because the atempo filter can only change the audio doubling speed statically and cannot be adjusted dynamically according to actual needs, a mechanism for dynamically informing and loading data in real time is added on the basis, so that the audio doubling speed can be adjusted in real time.
When the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, decoding the audio frame, calling an atempo filter, updating a value in the atempo filter for controlling the double speed of the audio frame, namely, tempo=1, changing a state value in the atempo filter into a read state, reloading a data packet of the audio frame, resampling the audio frame, and encoding and outputting;
when the FFmpeg library receives the double-speed control command and the double-speed parameter in the double-speed control command is not 1, decoding the audio frame, calling the atempo filter, updating a value in the atempo filter for controlling the double speed of the audio frame, namely, tempo=double-speed, changing a state value in the atempo filter into a reload state, reloading a data packet of the audio frame, resampling the audio frame, and encoding and outputting.
S24: and synchronizing the video frames and the audio frames in the on-demand file in a mode of adjusting output time stamps according to the change of the speed-doubling parameters.
Since the speed of the video needs to change the time stamp of the video, the change of the time stamp inevitably causes discontinuity of the output time stamp, and the change of the output time stamp needs to be adjusted according to the change of the speed.
S3: and the FFmpeg library pushes the on-demand file with the speed adjusted to a streaming media server.
Specifically, the FFmpeg library pushes the on-demand file with the speed adjusted to the streaming media server, and the subsequent service end directly obtains the on-demand file with the speed adjusted from the streaming media server without re-adjusting.
S4: the service end requests the streaming media server to pull streaming, and the streaming media server returns the on-demand file to the service end in a video transparent transmission mode.
Second embodiment
As shown in fig. 4, the present embodiment provides a control system for double-speed playing of video-on-demand files for performing the control method for double-speed playing of video-on-demand files as in the first embodiment, including:
the control command issuing module 1 is used for issuing a double-speed control command to an FFmpeg library of a server side by a service side where the player is located, and transmitting double-speed parameters to be controlled through the double-speed control command;
the double-speed task processing module 2 is used for providing the FFmpeg library with a task for executing the task of adjusting the double speed of the on-demand file of the monitoring video to be played according to the double-speed parameter in the double-speed control command and returning the task execution state to the service end;
the FFmpeg library push module 3 is configured to provide the FFmpeg library with push streaming of the on-demand file with the speed adjusted to a streaming media server;
and the service request stream pulling module 4 is used for providing the service end with a stream request stream pulling to the stream media server, and the stream media server returns the on-demand file to the service end in a video transmission mode.
A computer readable storage medium storing computer code which, when executed, performs a method as described above. Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The control method for double-speed playing of video monitoring on-demand files is characterized by comprising the following steps:
s1: the service end where the player is located issues a double-speed control command to the FFmpeg library of the service end, and double-speed parameters to be controlled are transmitted through the double-speed control command;
s2: the FFmpeg library executes the task of adjusting the double speed of the on-demand file of the monitoring video to be played according to the double speed parameter in the double speed control command, and returns the task execution state to the service end;
s3: the FFmpeg library pushes the on-demand file with the speed adjusted to a streaming media server;
s4: the service end requests the streaming media server to pull streaming, and the streaming media server returns the on-demand file to the service end in a video transparent transmission mode.
2. The method for controlling double-speed playing of video-on-demand files according to claim 1, further comprising, prior to step S1:
and the service end starts the FFmpeg library through a command line, and the FFmpeg library is used for reading and processing the on-demand file and pushing the on-demand file to the streaming media server.
3. The method for controlling double-speed playing of video-on-demand files according to claim 1, further comprising, in step S1:
a monitoring thread is arranged on the FFmpeg library of the server side, and the monitoring thread is used for monitoring instructions from the service side;
after monitoring the instruction from the service end, the monitoring thread returns a response message to the service end to inform the service end that the instruction from the service end is successfully received.
4. The method for controlling double-speed playing of video monitoring on-demand files according to claim 1, wherein in step S2, the double speed of the on-demand files of the monitoring video to be played is adjusted according to the double-speed parameter in the double-speed control command, specifically:
s21: reading each frame in the on-demand file according to the time stamp of each frame in the on-demand file;
s22: when the read current frame is a video frame, adjusting a video timestamp value of the video frame according to the speed doubling parameter;
s23: when the current frame is read as an audio frame, resampling the audio frame according to the speed-doubling parameter;
s24: and synchronizing the video frames and the audio frames in the on-demand file in a mode of adjusting output time stamps according to the change of the speed-doubling parameters.
5. The method for controlling double-speed playing of video surveillance video-on-demand files according to claim 4, wherein in step S21, each frame in the video-on-demand file is read according to a timestamp of each frame in the video-on-demand file, specifically:
when the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, comparing a timestamp pts of the current frame with a program running time now, when the timestamp pts > the program running time now, indicating that the current frame is not yet read, returning a program, and when the timestamp pts < = the program running time now, reading the current frame;
when the FFmpeg library receives the double speed control command and the double speed parameter in the double speed control command is not 1, dividing the time stamp pts by a double speed to obtain a time stamp pts ', namely pts' =pts/speed, adding the time stamp pts 'to a program, and obtaining a program running time now' from the accumulated execution time now2, namely now '=pts' +now2, when the time stamp pts '> is not the program running time now', indicating that the time of reading the current frame is not reached, returning the program, and when the time stamp pts '<=the program running time now', reading the current frame.
6. The method for controlling double-speed playing of video-on-demand files according to claim 4, wherein in step S22, when the current frame read is the video frame, the video timestamp value of the video frame is adjusted according to the double-speed parameter, specifically:
when the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, the frame interval duration value of the video frame is unchanged, and the video timestamp value dts of the output video frame=the video timestamp value dts of the last frame+the frame interval duration value;
when the FFmpeg library receives the double-speed control command and the double-speed parameter in the double-speed control command is not 1, calculating a frame interval duration value=original frame interval duration/double-speed of the video frame, wherein the video timestamp value dts of the output video frame=the video timestamp value dts of the last frame+the frame interval duration value.
7. The method for controlling double-speed playing of video-on-demand files according to claim 4, wherein in step S23, when the current frame read is the audio frame, resampling the audio frame according to the double-speed parameter is performed, specifically:
when the FFmpeg library does not receive the double speed control command or the double speed parameter in the double speed control command is 1, decoding the audio frame, calling an atempo filter, updating a value in the atempo filter for controlling the double speed of the audio frame, namely, tempo=1, changing a state value in the atempo filter into a read state, reloading a data packet of the audio frame, resampling the audio frame, and encoding and outputting;
when the FFmpeg library receives the double-speed control command and the double-speed parameter in the double-speed control command is not 1, decoding the audio frame, calling the atempo filter, updating a value in the atempo filter for controlling the double speed of the audio frame, namely, tempo=double-speed, changing a state value in the atempo filter into a reload state, reloading a data packet of the audio frame, resampling the audio frame, and encoding and outputting.
8. A control system for double-rate playing of video-on-demand files for performing the control method for double-rate playing of video-on-demand files for video monitoring as claimed in any one of claims 1 to 7, characterized by comprising:
the control command issuing module is used for issuing a double-speed control command to the FFmpeg library of the server side by the service side where the player is located, and transmitting double-speed parameters to be controlled through the double-speed control command;
the speed doubling task processing module is used for providing the FFmpeg library with a task for executing the task of adjusting the speed doubling of the video-on-demand file of the monitoring video to be played according to the speed doubling parameter in the speed doubling control command and returning the task execution state to the service end;
the FFmpeg library push streaming module is used for providing the FFmpeg library with push streaming of the on-demand file with the speed adjusted to a streaming media server;
and the service request stream pulling module is used for providing the service end with a request stream pulling to the streaming media server, and the streaming media server returns the on-demand file to the service end in a video transmission mode.
9. A computer device comprising a memory and one or more processors, the memory having stored therein computer code that, when executed by the one or more processors, causes the one or more processors to perform the method of any of claims 1-7.
10. A computer readable storage medium storing computer code which, when executed, performs the method of any one of claims 1 to 7.
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| CN202311738185.1A CN117750138A (en) | 2023-12-18 | 2023-12-18 | Control method and system for double-speed playing of video monitoring on-demand file |
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| CN202311738185.1A CN117750138A (en) | 2023-12-18 | 2023-12-18 | Control method and system for double-speed playing of video monitoring on-demand file |
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