CN113055733A - Method, device and equipment for generating video data with stable frame rate and storage medium - Google Patents
Method, device and equipment for generating video data with stable frame rate and storage medium Download PDFInfo
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- CN113055733A CN113055733A CN202110276261.6A CN202110276261A CN113055733A CN 113055733 A CN113055733 A CN 113055733A CN 202110276261 A CN202110276261 A CN 202110276261A CN 113055733 A CN113055733 A CN 113055733A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4334—Recording operations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
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Abstract
The invention provides a method, a device, equipment and a storage medium for generating video data with a stable frame rate, wherein the method comprises the following steps: determining a mode of acquiring the acquired video data by the system; if the mode of acquiring the acquired video data by the system is acquired through a callback interface, a cache for storing only one frame of video picture is preset before the video data is acquired; when the picture of the collected video data changes, calling back to obtain the latest collected frame of video picture and storing the latest collected frame of video picture into the cache; when video data is generated, a thread is started to acquire video frames required by the video data from the cache at fixed time intervals. According to the method for generating the video data with the stable frame rate, when the acquired video data is acquired through the callback interface, one frame of video picture acquired through callback is stored in the special cache for being acquired by the thread generating the video data, so that stable and continuous video frames can be acquired, and the video playing effect is better.
Description
Technical Field
The present invention relates to the field of screen projection technologies, and in particular, to a method, an apparatus, a device, and a storage medium for generating video data with a stable frame rate.
Background
At present, in screen projection, the sources of video data mainly include camera acquisition, equipment desktop data acquisition and the like, different system platforms provide different acquisition modes, call-back is triggered only when the video data changes through a call-back interface, and an interface is provided to allow a user to actively call the video data and desktop snapshot data acquired by the camera, so that video frame rates acquired by the user on different equipment are different, and the instability of frame rate acquisition can influence the subsequent video display effect.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention mainly aims to solve the technical problem that the video display effect is poor due to unstable frame rates of video data acquired by different acquisition modes in the prior art.
The first aspect of the present invention provides a method for generating video data with a stable frame rate, where the method for generating video data with a stable frame rate includes:
determining a mode of acquiring the acquired video data by the system;
if the mode of acquiring the acquired video data by the system is acquired through a callback interface, a cache for storing only one frame of video picture is preset before the video data is acquired;
when the picture of the collected video data changes, calling back to obtain the latest collected frame of video picture and storing the latest collected frame of video picture into the cache;
when video data is generated, a thread is started to acquire video frames required by the video data from the cache at fixed time intervals.
In an optional implementation manner of the first aspect of the present invention, the method for generating stable frame rate video data further includes:
if the mode of acquiring the collected video data by the system is to acquire the video data by actively calling the interface, each frame of video picture acquired in real time is directly used as a video frame of the video data.
In an alternative embodiment of the first aspect of the present invention, the cache is read-only or write-only at the same time.
In an optional implementation manner of the first aspect of the present invention, before the callback acquiring and storing the latest captured frame of video picture in the cache when there is a change in the captured video picture, the method includes: and registering the callback in advance.
In an alternative implementation manner of the first aspect of the present invention, the manner of acquiring the video data includes a camera acquisition and a screen recording acquisition.
In an alternative embodiment of the first aspect of the present invention, the frame rate of the captured video data is 10-60 frames per second.
In an alternative embodiment of the first aspect of the present invention, the time interval is 1 to 3 milliseconds.
The second aspect of the present invention further provides a device for generating video data with a stable frame rate, the device comprising:
the determining module is used for determining the mode of the system for acquiring the acquired video data;
the setting module is used for presetting a cache for storing only one frame of video image before the video data is acquired if the mode of acquiring the acquired video data by the system is acquired through the callback interface;
the callback module is used for calling back to acquire the latest collected frame of video image and storing the latest collected frame of video image into the cache when the image of the collected video data changes;
and the acquisition module is used for starting a thread when video data are generated, and acquiring the video frames required by the video data from the cache at a fixed time interval.
A third aspect of the present invention provides a device for generating stable frame rate video data, comprising: a memory having instructions stored therein and at least one processor, the memory and the at least one processor interconnected by a line;
the at least one processor invoking the instructions in the memory to cause the apparatus for generating stable frame rate video data to perform a method of generating stable frame rate video data as described in any one of the above.
A fourth aspect of the present invention provides a computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for generating video data with a stable frame rate as described in any one of the above.
Has the advantages that: the invention provides a method, a device, equipment and a storage medium for generating video data with a stable frame rate, wherein the method comprises the following steps: determining a mode of acquiring the acquired video data by the system; if the mode of acquiring the acquired video data by the system is acquired through a callback interface, a cache for storing only one frame of video picture is preset before the video data is acquired; when the picture of the collected video data changes, calling back to obtain the latest collected frame of video picture and storing the latest collected frame of video picture into the cache; when video data is generated, a thread is started to acquire video frames required by the video data from the cache at fixed time intervals. According to the method for generating the video data with the stable frame rate, when the acquired video data is acquired through the callback interface, one frame of video picture acquired through callback is stored in the special cache for being acquired by the thread generating the video data, so that stable and continuous video frames can be acquired, and the playing effect is better.
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Fig. 1 is a schematic diagram of an embodiment of a method for generating video data with a stable frame rate according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a frame rate stabilized video data generating apparatus according to the present invention;
fig. 3 is a schematic diagram of an embodiment of a frame rate stabilized video data generating apparatus according to the present invention.
Detailed Description
The embodiment of the invention provides a method, a device, equipment and a storage medium for generating video data with a stable frame rate.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," or "having," and any variations thereof, are intended to cover non-exclusive inclusions, 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.
For facilitating understanding, a detailed flow of an embodiment of the present invention is described below, and with reference to fig. 1, a first aspect of the present invention provides a method for generating video data with a stable frame rate, where the method for generating video data with a stable frame rate includes:
s100, determining a mode of acquiring the acquired video data by the system;
in this embodiment, the technical solution of the present invention is mainly directed to the situation that the acquired video data is acquired through the callback interface, and specifically, if the acquired video data is acquired through the callback interface, the system will trigger the interface to acquire the updated frame of the video data only when it is detected that the frame of the acquired video data is changed, and the video data stored in this way will save storage space for a short time, but the problem that the finally acquired video data is not real video data on the one hand, and will be discontinuous after being played, which affects the impression is brought.
S200, if the mode of acquiring the acquired video data by the system is acquired through a callback interface, presetting a cache for storing only one frame of video image before acquiring the video data;
in this embodiment, the invention of the technical solution of the present invention does not only use each frame of picture that changes to form video data, but sets a buffer that stores only one frame of picture to temporarily store each frame of picture first, and if the picture does not change, the same picture can be obtained many times to complement the video frame within a time period, so that the generated video data is more real when played, and the frame rate is more stable;
s300, when the picture of the collected video data changes, calling back to obtain the latest collected frame of video picture and storing the latest collected frame of video picture into the cache;
in this embodiment, the way for the callback interface to acquire the acquired video data is to acquire the acquired video picture of the frame only in the acquired video picture change time zone, and according to the technical scheme of the invention, the video picture of the frame is firstly put into a cache for later thread acquisition, and when the video picture changes again, the changed video picture is updated and replaced into the cache;
s400, when video data are generated, starting a thread, and acquiring video frames required by the video data from the cache at a fixed time interval.
In this embodiment, in order to stabilize the frame rate of the generated video data, a thread is set to acquire each frame of picture of the generated video data from a buffer according to a fixed time interval, so that the video data with a stable frame rate can be obtained, and the video data can be played more smoothly and more truly due to the increase of the number of frames of the video.
In an optional implementation manner of the first aspect of the present invention, the method for generating stable frame rate video data further includes:
s500, if the mode of acquiring the collected video data by the system is to acquire the video data by actively calling an interface, directly taking each frame of video picture acquired in real time as a video frame of the video data.
In this embodiment, if the system actively acquires the acquired video data through the interface, the system can acquire each frame of completely acquired image, i.e., a real-time image, and the video data is naturally smooth and coherent, so that the video image acquired by each frame does not need to be stored through a buffer.
In an alternative embodiment of the first aspect of the present invention, the cache is read-only or write-only at the same time.
In this embodiment, after the collected changed video pictures are recalled and acquired, the collected changed video pictures are stored in the cache, and then the thread reads the video pictures from the cache, if the changed video pictures need to be updated into the cache, the thread must wait for the thread to read the video pictures in the cache, that is, the operations of cache reading and writing are mutually exclusive, so that the stability of system operation is improved, and the reliability of finally generated video data is also ensured.
In an optional implementation manner of the first aspect of the present invention, before the callback acquiring and storing the latest captured frame of video picture in the cache when there is a change in the captured video picture, the method includes: and registering the callback in advance. In this embodiment, the callback operation needs to be registered before the system callback acquires the latest frame of video picture, so as to ensure that the system can recognize the callback each time.
In an alternative implementation manner of the first aspect of the present invention, the manner of acquiring the video data includes a camera acquisition and a screen recording acquisition. In this embodiment, the video data generation method of the present invention is mainly applied to screen projection and video conferences, and common video data acquisition modes in screen projection and video conferences include camera acquisition and screen recording acquisition, but the modes of acquiring video data in the technical solution of the present invention include, but are not limited to, these two modes.
In an alternative embodiment of the first aspect of the present invention, the frame rate of the captured video data is 10-60 frames per second.
In an alternative embodiment of the first aspect of the present invention, the time interval is 1 to 3 milliseconds.
Referring to fig. 2, a second aspect of the present invention provides an apparatus for generating stable frame rate video data, including:
a determining module 10, configured to determine a manner in which the system acquires the acquired video data;
the setting module 20 is configured to, if the mode of acquiring the acquired video data by the system is acquired through the callback interface, preset a cache for storing only one frame of video image before acquiring the video data;
the callback module 30 is used for calling back to acquire the latest collected frame of video image and storing the latest collected frame of video image into the cache when the image of the collected video data changes;
the obtaining module 40 is configured to start a thread when video data is generated, and obtain video frames required by the video data from the buffer at a fixed time interval.
In an optional implementation manner of the second aspect of the present invention, the apparatus for generating stable frame rate video data further includes:
and the second acquisition module is used for directly taking each frame of video image acquired in real time as a video frame of the video data if the mode of acquiring the video data by the system is actively acquired through an interface.
In an optional implementation manner of the second aspect of the present invention, the apparatus for generating stable frame rate video data further includes:
and the registration module is used for registering the call-back in advance.
In an alternative embodiment of the second aspect of the invention, the cache is read-only or write-only at the same time.
In an alternative embodiment of the second aspect of the present invention, the manner of acquiring the video data includes a camera acquisition and a screen recording acquisition.
In an alternative embodiment of the second aspect of the present invention, the frame rate of the captured video data is 10-60 frames per second.
In an alternative embodiment of the second aspect of the present invention, the time interval is 1 to 3 milliseconds.
Fig. 3 is a schematic structural diagram of a frame rate stabilized video data generating apparatus according to an embodiment of the present invention, which may have a relatively large difference due to different configurations or performances, and may include one or more processors 50 (CPUs) (e.g., one or more processors) and a memory 60, and one or more storage media 70 (e.g., one or more mass storage devices) for storing applications or data. The memory and storage medium may be, among other things, transient or persistent storage. The program stored on the storage medium may include one or more modules (not shown), each of which may include a sequence of instructions for operating on the wireless projection device. Still further, the processor may be configured to communicate with a storage medium, and execute a series of instruction operations in the storage medium on a generating device of the stable frame rate video data.
The apparatus for generating frame rate stabilized video data according to the present invention may further comprise one or more power supplies 80, one or more wired or wireless network interfaces 90, one or more input/output interfaces 100, and/or one or more operating systems, such as Windows server, Mac OS X, Unix, Linux, FreeBSD, etc. It will be appreciated by those skilled in the art that the structure of the stable frame rate video data generating apparatus shown in fig. 3 does not constitute a limitation of the stable frame rate video data generating apparatus, and may include more or less components than those shown, or some components may be combined, or a different arrangement of components may be used.
The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium, and may also be a volatile computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the instructions cause the computer to execute the steps of the method for generating stable frame rate video data.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for generating stable frame rate video data, the method comprising:
determining a mode of acquiring the acquired video data by the system;
if the mode of acquiring the acquired video data by the system is acquired through a callback interface, a cache for storing only one frame of video picture is preset before the video data is acquired;
when the picture of the collected video data changes, calling back to obtain the latest collected frame of video picture and storing the latest collected frame of video picture into the cache;
when video data is generated, a thread is started to acquire video frames required by the video data from the cache at fixed time intervals.
2. The method of claim 1, wherein the method further comprises:
if the mode of acquiring the collected video data by the system is to acquire the video data by actively calling the interface, each frame of video picture acquired in real time is directly used as a video frame of the video data.
3. The method of claim 1, wherein the buffer is only read or only written at the same time.
4. The method of claim 1, wherein the calling back, when there is a change in the captured video frames, before acquiring and storing the latest captured video frame into the cache, comprises: and registering the callback in advance.
5. The method for generating video data with stable frame rate according to claim 1, wherein the manner of collecting video data includes camera collection and screen recording collection.
6. The method of claim 1, wherein the frame rate of the captured video data is 10-60 frames per second.
7. The method of claim 1, wherein the time interval is 1-3 ms.
8. An apparatus for generating stable frame rate video data, the apparatus comprising:
the determining module is used for determining the mode of the system for acquiring the acquired video data;
the setting module is used for presetting a cache for storing only one frame of video image before the video data is acquired if the mode of acquiring the acquired video data by the system is acquired through the callback interface;
the callback module is used for calling back to acquire the latest collected frame of video image and storing the latest collected frame of video image into the cache when the image of the collected video data changes;
and the acquisition module is used for starting a thread when video data are generated, and acquiring the video frames required by the video data from the cache at a fixed time interval.
9. A generating device of stable frame rate video data, characterized in that the generating device of stable frame rate video data comprises: a memory having instructions stored therein and at least one processor, the memory and the at least one processor interconnected by a line;
the at least one processor invoking the instructions in the memory to cause the apparatus for generating stable frame rate video data to perform a method of generating stable frame rate video data according to any one of claims 1 to 7.
10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for generating video data with a stable frame rate according to any one of claims 1 to 7.
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Application publication date: 20210629 |