CN113938619A - Video synthesis method, system and storage device based on browser - Google Patents
Video synthesis method, system and storage device based on browser Download PDFInfo
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- CN113938619A CN113938619A CN202111261651.2A CN202111261651A CN113938619A CN 113938619 A CN113938619 A CN 113938619A CN 202111261651 A CN202111261651 A CN 202111261651A CN 113938619 A CN113938619 A CN 113938619A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/265—Mixing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
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- Television Signal Processing For Recording (AREA)
Abstract
The invention relates to a video synthesis method, a system and a storage module based on a browser, which comprises the following steps: creating a canvas element in a browser, and importing an image set to be synthesized into the canvas element; creating an audio element in a browser, and setting an audio source of the audio element or importing the audio source to the audio element; capturing an image stream from the canvas element, an audio stream from the audio element; merging the audio stream and the image stream to obtain a media stream; and calling a recording function of the browser to record the media stream to obtain a synthesized video. According to the method and the device, the canvas element is created, the image set to be synthesized is led into the canvas element, one image can be spliced into one video in the browser, and meanwhile, the audio element is created and the audio is obtained, so that the audio can be obtained. And finally, combining the video and the audio and importing the video and the audio into a recording function, thereby solving the technical problem that the existing browser cannot synthesize the video.
Description
Technical Field
The invention relates to the field of browser video synthesis, in particular to a video synthesis method, a video synthesis system and a storage device based on a browser.
Background
Browsers are application programs used to retrieve, present, and deliver Web information resources. A Web information Resource is tagged by a Uniform Resource Identifier (URI), which is a Web page, a picture, a piece of video, or any content presented on the Web. The user can browse the information associated with each other through a browser by means of Hyperlinks (Hyperlinks).
Existing browsers offer a variety of multimedia capabilities, such as using the HTML5 native video tag to invoke a corresponding decoder to play video, or to record content in a web page by invoking the MediaRecorder function. However, existing browsers do not provide the ability to compose/generate video.
The present invention is directed to a method, a system, and a storage device for video synthesis based on a browser, which are designed to solve the above problems in the prior art.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a video synthesis method, system and storage device based on a browser, which can effectively solve the above problems in the prior art.
The technical scheme of the invention is as follows:
a video synthesis method based on a browser comprises the following steps:
creating a canvas element in a browser, and importing an image set to be synthesized into the canvas element;
creating an audio element in a browser, and setting an audio source of the audio element or importing the audio source to the audio element;
capturing an image stream from the canvas element, an audio stream from the audio element;
merging the audio stream and the image stream to obtain a media stream;
and calling a recording function of the browser to record the media stream to obtain a synthesized video.
Further, said merging the audio stream and the image stream comprises:
extracting an audio track of the audio stream, and merging the audio track and the image stream;
or extracting an image track of the image stream and combining the image track with the audio stream.
Furthermore, the image set to be synthesized comprises a plurality of images to be synthesized, and the images to be synthesized are arranged according to a time sequence.
Further, the creating an audio element in the browser comprises:
an Audio Element is created in the browser through the HTML Audio Element interface.
Further, said capturing an image stream from said canvas element, and capturing an audio stream from said audio element comprises:
obtaining a preset starting time, starting to capture an image stream from the canvas element from the starting time, and starting to capture an audio stream from the audio element from the starting time.
Further, a canvas.
Further, an audio track of the audio stream is extracted by calling an audio.
Further, the recording of the media stream by the browser includes:
constructing a recorder in a browser;
inputting the media stream into the recorder;
recording the media stream by the recorder.
There is further provided a system for browser-based video compositing, comprising the following modules:
the canvas element constructing module: the system comprises a browser and a server, wherein the browser is used for creating a canvas element in the browser and importing an image set to be synthesized into the canvas element;
the audio element construction module: the browser is used for creating an audio element in the browser, and setting an audio source of the audio element or leading the audio source to the audio element;
a capture module: for capturing an image stream from the canvas element and an audio stream from the audio element;
a synthesis module: the audio stream and the image stream are merged to obtain a media stream;
a recording module: and the browser is used for recording the media stream to obtain a composite video.
There is further provided a computer readable storage medium storing a computer program which, when executed by a processor, implements a browser-based video compositing method as described above.
Accordingly, the present invention provides the following effects and/or advantages:
according to the method and the device, the canvas element is created, the image set to be synthesized is led into the canvas element, one image can be spliced into one video in the browser, and meanwhile, the audio element is created and the audio is obtained, so that the audio can be obtained. And finally, combining the video and the audio and importing the video and the audio into a recording function, thereby solving the technical problem that the existing browser cannot synthesize the video.
The application provides two methods for merging an audio stream and an image stream, one is to extract an audio track of the audio stream and merge the audio track and the image stream; and the other one extracts the image track of the image stream and combines the image track with the audio stream. By acquiring one of the tracks and merging the tracks into the other stream, a media stream can be directly generated, and the media stream contains audio data and picture data, so that the implementation of the application is facilitated.
The method includes the steps that a recorder is built in a browser through a MediaRecorder function; inputting the media stream into the recorder. By importing the media stream into the recorder, parameters to be recorded, such as bit rate, can be set efficiently, thereby generating a desired video file.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a diagram of creating a canvas element.
FIG. 3 is a diagram illustrating the result of importing the image set to be synthesized into the canvas element.
Fig. 4 is a schematic diagram of creating audio elements.
Fig. 5 is a schematic diagram of an image stream and an audio stream.
Fig. 6 is a schematic diagram of extracting an audio track of the audio stream and merging the audio track and the image stream.
Fig. 7 is a schematic diagram of extracting an image track of the image stream and merging the image track with the audio stream.
Fig. 8 is a schematic diagram of the introduction of a media stream to a recorder.
Fig. 9 is a schematic diagram of playing the generated result video.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings:
referring to fig. 1, a method for synthesizing a browser-based video includes the following steps:
s1, creating the canvas element in the browser through a canvas interface, and importing the image set to be synthesized into the canvas element.
In this embodiment, as used herein, the term "canvas element" may be considered synonymous with and/or referred to as: the canvas element provides a resolution-dependent bitmap canvas that can be used to draw graphics, make games, or other dynamic images using JavaScript scripts. The canvas element is completed based on the canvas element of HTML 5.
In this embodiment, as used herein, the term "canvas" may be considered synonymous with and/or referred to as: canvas is a pixel-based drawing, equivalent to the HTML5 node of a palette, that allows users to draw various graphics in the Web.
In this step, a canvas element is created in the browser through the canvas interface to obtain the canvas shown in fig. 2, and then the image set to be synthesized is imported into the canvas element. The image set to be synthesized may be pictures corresponding to consecutive frames in a video, or may be other images, which is not limited herein. For convenience of description, in this embodiment, pictures corresponding to consecutive frames in a video are used as an image set to be synthesized, where the image set to be synthesized is arranged in a frame order. The image set to be synthesized may also be named frame 1, frame 2 … frame i in terms of the sequence of frames. Then, the image sets to be synthesized are imported into the canvas element one by one according to the frame sequence, as shown in fig. 3, the 1 st frame is arranged at the bottom, the ith frame is arranged at the top, and all the image sets to be synthesized are sequentially superposed in the canvas element.
S2, as shown in fig. 4, creating an audio element in the browser, and setting or importing an audio source of the audio element to the audio element.
In this embodiment, as used herein, the term "audio element" may be considered synonymous with and/or referred to as: for embedding audio content in a browser, an audio element may contain one or more audio assets, which may be described using an src attribute or a < source > element: the browser will select the most appropriate one to use. This element can also be used for streaming media using MediaStream. The audio element may play audio according to the user's settings.
After the audio element is created, an audio source or an import audio source of the audio element needs to be set, so that the audio element is informed of the audio to be played. In this embodiment, the audio source of the audio element is set for explanation, first, the audio source may be a piece of music or a piece of sound, and the address of the audio source may be written and set through the src attribute or the < source > element, so that the audio source may be played by the element.
S3, capturing an image stream from the canvas element and an audio stream from the audio element.
In this embodiment, frame 1, frame 2, frame i-1, and frame i of … may be captured continuously by the canvas element. So that a continuous animation-like picture, i.e. a stream of images, will be generated. There is also a need to capture an audio stream from an audio element. At this point, we obtain an image stream and an audio stream. The image stream and the audio stream are binary files with one continuous end, respectively contain image information and audio information, and can be played or analyzed through a browser or other players to respectively obtain corresponding animations and audios. The results shown in fig. 5 were obtained.
And S4, merging the audio stream and the image stream to obtain a media stream.
In this embodiment, the audio stream is used to provide a sound source file for a subsequent media stream, the image stream is used to provide an image source file for the subsequent media stream, and the audio stream and the image stream are combined to obtain a media stream that can be played in the browser, where the audio stream and the image stream correspond to each other after being played.
Specifically, the merging of the audio stream and the image stream may be implemented by the following two methods:
the first method, referring to fig. 6, extracts the audio track of the audio stream, and combines the audio track and the image stream to obtain an image stream containing audio track data.
The second method, referring to fig. 7, extracts the image track of the image stream, and combines the image track with the audio stream to obtain an audio stream containing image track data.
At this time, the image stream containing the audio track data or the audio stream containing the image track data is collectively referred to as a media stream.
In this embodiment, the first method and the second method do not affect the implementation of the present application, and the audio stream and the image stream can be combined to obtain the media stream. Video is generally divided into two parts, animation and audio, with images on an image track and audio on an audio track. That is, the audio track is used to place audio and the image track is used to place animation. The audio track of the audio stream is extracted, the audio track and the image stream are combined, or the image track of the image stream is extracted, the image track and the audio stream are combined, so that a corresponding track is obtained, the corresponding track is combined into another stream, the combination of the two is realized, and a combined stream is obtained. In this case, the merged stream is an animation with audio and video.
Each stream may contain a plurality of different types of tracks.
And S5, recording the media stream through the browser to obtain a composite video.
The method specifically comprises the following steps: the browser records the media stream through a recording function, the recording function is a MediaRecorder function, and the recording the media stream through the browser includes:
s5.1, constructing a recorder in the browser through the MediaRecorder function;
s5.2, inputting the media stream into the recorder;
and S5.3, recording the media stream through the recorder.
In this embodiment, as used herein, the term "MediaRecorder function" can be considered synonymous with and/or referred to as: is an interface provided by the browser for easy recording of media. Any media form of elements, including < audio >, < video >, < canvas >, where < audio >, < video > may be from a network media file or may be from a local device collection.
In order to use the MediaRecorder function, a recorder generally needs to be constructed by the MediaRecorder function, and simultaneously, the code rates of audio and video or both of the audio and video need to be set. Constructing a recorder may be accomplished by the following code:
const recorder＝new MediaRecorder(stream)。
at this time, a recorder is obtained, and then the media stream obtained in S4 is introduced into the recorder, and referring to fig. 8, for example, a combined video stream (media stream) of an audio track and a video stream is introduced into a new media recorder, that is, the media stream can be recorded in the recorder. The media stream data recorded by the standard encoding may be packaged to generate a video file, and a resulting video as shown in fig. 9 is obtained.
Furthermore, the image set to be synthesized comprises a plurality of images to be synthesized, and the images to be synthesized are arranged according to a time sequence.
Further, the creating an audio element in the browser comprises:
an Audio Element is created in the browser through the HTML Audio Element interface.
Further, said capturing an image stream from said canvas element, and capturing an audio stream from said audio element comprises:
obtaining a preset starting time, starting to capture an image stream from the canvas element from the starting time, and starting to capture an audio stream from the audio element from the starting time.
In order to synchronize the audio stream and the image stream, the present embodiment may further set a start time at which to synchronize the capture of the image stream from the canvas element and the capture of the audio stream from the audio element. The start time of the image stream and the start time of the audio stream are the same, and the video with synchronous images and audio can be generated in the subsequent playing and recording processes.
Further, a canvas.
Further, an audio track of the audio stream is extracted by calling an audio.
Example two
A system for browser-based video compositing, comprising the following modules:
the canvas element constructing module: the system comprises a browser and a server, wherein the browser is used for creating a canvas element in the browser and importing an image set to be synthesized into the canvas element;
the audio element construction module: the browser is used for creating an audio element in the browser, and setting an audio source of the audio element or leading the audio source to the audio element;
a capture module: for capturing an image stream from the canvas element and an audio stream from the audio element;
a synthesis module: the audio stream and the image stream are merged to obtain a media stream;
a recording module: and the browser is used for recording the media stream to obtain a composite video.
EXAMPLE III
A computer-readable storage medium storing a computer program which, when executed by a processor, implements a browser-based video compositing method according to an embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (10)
1. A video synthesis method based on a browser is characterized in that: comprises the following steps:
creating a canvas element in a browser, and importing an image set to be synthesized into the canvas element;
creating an audio element in the browser, and setting an audio source of the audio element or importing the audio source to the audio element;
capturing an image stream from the canvas element, an audio stream from the audio element;
merging the audio stream and the image stream to obtain a media stream;
and recording the media stream through the browser to obtain a composite video.
2. A method for browser-based video compositing according to claim 1, characterized by: said merging the audio stream and the image stream comprises:
extracting an audio track of the audio stream, and merging the audio track and the image stream;
or extracting an image track of the image stream and combining the image track with the audio stream.
3. A method for browser-based video compositing according to claim 1, characterized by: the image set to be synthesized comprises a plurality of images to be synthesized, and the images to be synthesized are arranged according to a time sequence.
4. A method for browser-based video compositing according to claim 1, characterized by: the creating an audio element in the browser comprises:
an Audio Element is created in the browser through the HTML Audio Element interface.
5. A method for browser-based video compositing according to claim 1, characterized by: said capturing an image stream from said canvas element, capturing an audio stream from said audio element comprising:
obtaining a preset starting time, starting to capture an image stream from the canvas element from the starting time, and starting to capture an audio stream from the audio element from the starting time.
6. A method for browser-based video compositing according to claim 1, characterized by:
call a canvas.
7. A method for browser-based video compositing according to claim 1, characterized by: invoking an audio. getaudiotracks function in a browser to extract an audio track of the audio stream.
8. A method for browser-based video compositing according to claim 1, characterized by: the recording the media stream through the browser comprises:
constructing a recorder in a browser;
inputting the media stream into the recorder;
recording the media stream by the recorder.
9. A system for browser-based video compositing, characterized by: the system comprises the following modules:
the canvas element constructing module: the system comprises a browser and a server, wherein the browser is used for creating a canvas element in the browser and importing an image set to be synthesized into the canvas element;
the audio element construction module: the browser is used for creating an audio element in the browser, and setting an audio source of the audio element or leading the audio source to the audio element;
a capture module: for capturing an image stream from the canvas element and an audio stream from the audio element;
a synthesis module: the audio stream and the image stream are merged to obtain a media stream;
a recording module: and the browser is used for recording the media stream to obtain a composite video.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements a browser-based video composition method as recited in claim 1.
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| CN115086717A (en) * | 2022-06-01 | 2022-09-20 | 北京元意科技有限公司 | Method and system for real-time editing, rendering and synthesizing of audio and video works |
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