CN110290143B - Video online editing method and device, electronic equipment and storage medium - Google Patents
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- 230000002194 synthesizing effect Effects 0.000 claims abstract description 7
- 230000001360 synchronised effect Effects 0.000 claims description 37
- 238000004590 computer program Methods 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000003786 synthesis reaction Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
- H04N21/2187—Live feed
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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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64746—Control signals issued by the network directed to the server or the client
- H04N21/64761—Control signals issued by the network directed to the server or the client directed to the server
- H04N21/64769—Control signals issued by the network directed to the server or the client directed to the server for rate control
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Abstract
The embodiment of the invention provides a video online editing method and device, electronic equipment and a storage medium. The video online editing method comprises the following steps: receiving a video material which contains a video frame sequence and an audio frame sequence and is sent by a front end; determining the video frame sequence and the audio frame sequence, and the time offset on a given time axis; aligning the sequence of video frames and the sequence of audio frames according to the time offset; and synthesizing the video based on the aligned video frame sequence and audio frame sequence.
Description
Technical Field
The present invention relates to the field of video technologies, and in particular, to a method and an apparatus for online editing of a video, an electronic device, and a storage medium.
Background
Currently, a technical framework for online editing of online videos generally performs preview in a front-end browser, transmits corresponding materials and parameters such as time points and special effects related to editing to a back-end server after storage and submission, and finally performs corresponding video synthesis by a back end. The front-end browser is typically visible in the terminal.
The method for keeping the front end and the back end consistent at present mainly comprises the steps of transcoding a material video before the material video enters an editor, so that timestamps of the material video are unified from zero, and images obtained by the front end and the back end are consistent when the front end and the back end obtain the images at the same time point; it has been found that the preview content and the final composite content are not consistent even after transcoding. And if the material time length of video online editing is long, the required transcoding time will also become long, resulting in slow whole engineering efficiency.
Disclosure of Invention
In view of the above, the present invention provides a video online editing method, a video online editing device, an electronic device, and a storage medium video online editing method.
The technical scheme of the invention is realized as follows:
in a first aspect of the embodiments of the present invention, a method for editing a video online is provided, including:
receiving a video material which contains a video frame sequence and an audio frame sequence and is sent by a front end;
determining the video frame sequence and the audio frame sequence, and the time offset on a given time axis;
aligning the sequence of video frames and the sequence of audio frames according to the time offset;
and synthesizing the video based on the aligned video frame sequence and audio frame sequence.
Based on the above scheme, the method further comprises:
and synchronizing the frame rate of the video with the front end, wherein the frame rate is the frame rate of the front end video preview.
Based on the above scheme, the method further comprises:
when the actual frame rate of the received video frame sequence is different from the synchronous frame rate, adjusting the frame rate of the video frame sequence;
said aligning the sequence of video frames and the sequence of audio frames according to the time offset comprises:
and aligning the video frame sequence and the audio frame sequence which are adjusted to synchronous frame rates according to the time offset.
Based on the above solution, when the actual frame rate of the received video frame sequence is different from the synchronized frame rate, adjusting the frame rates of the video frame sequence includes:
when the actual frame rate of the received video frame sequence is larger than the synchronous frame rate, the frame rate of the video frame sequence is adjusted in a frame extraction mode.
Based on the above solution, when the actual frame rate of the received video frame sequence is different from the synchronized frame rate, adjusting the frame rates of the video frame sequence includes:
and when the actual frame rate of the received video frame sequence is less than the synchronous frame rate, adjusting the frame rate of the video frame sequence in a frame supplementing mode.
In a second aspect of the embodiments of the present invention, there is provided a video online editing apparatus, including:
the receiving module is used for receiving a video material which contains a video frame sequence and an audio frame sequence and is sent by a front end;
a determining module for determining the video frame sequence and the audio frame sequence, a time offset on a given time axis; an alignment module for aligning the video frame sequence and the audio frame sequence according to the time offset;
and the synthesis module is used for synthesizing the video based on the aligned video frame sequence and audio frame sequence.
Based on the above scheme, the apparatus further comprises:
and the synchronization module is used for synchronizing the frame rate of the video with the front end, wherein the frame rate is the frame rate of the front end video preview.
Based on the above scheme, the apparatus further comprises:
the adjusting module is used for adjusting the frame rates of the video frame sequences when the actual frame rates of the received video frame sequences are different from the synchronous frame rates;
the alignment module is specifically configured to align the video frame sequence and the audio frame sequence adjusted to the synchronous frame rate according to the time offset.
Based on the above scheme, the adjusting module is specifically configured to adjust the frame rates of the video frame sequences in a frame extraction manner when the actual frame rate of the received video frame sequences is greater than the synchronous frame rate.
Based on the above scheme, the adjusting module is specifically configured to adjust the frame rates of the video frame sequences in a frame complementing manner when the actual frame rates of the received video frame sequences are less than the synchronous frame rate.
In a third aspect of the embodiments of the present invention, there is provided an electronic device, including: a processor and a memory for storing a computer program capable of running on the processor;
when the processor is used for running the computer program, the video online editing method according to any embodiment of the invention is realized.
A fourth aspect of the embodiments of the present invention provides a computer storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the video online editing method according to any one of the embodiments of the present invention.
According to the technical scheme provided by the embodiment of the invention, when the video is edited on line, the back end determines the time offset between the video frame sequence and the audio frame sequence, and the video is synthesized after the video frame sequence and the audio frame sequence are aligned. Therefore, transcoding operation is not needed to be carried out on the material before online editing is carried out in order to match the subsequent back-end synthesis and the front-end preview to keep the content consistent, so that on one hand, the preview effect of the front end on the video to be synthesized is ensured to be consistent with the video effect actually synthesized by the back end; on the other hand, time consumption of transcoding before editing is reduced, and overall efficiency is improved.
Drawings
Fig. 1 is a schematic flow chart according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a time offset according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a video online editing method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a frame extraction method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a frame complementing method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a video online editing apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Before further detailed description of the present invention, terms and expressions referred to in the embodiments of the present invention are described, and the terms and expressions referred to in the embodiments of the present invention are applicable to the following explanations.
As shown in fig. 1, the present embodiment provides a video online editing method, including:
step S110: receiving a video material which contains a video frame sequence and an audio frame sequence and is sent by a front end;
step S120: determining the video frame sequence and the audio frame sequence, and the time offset on a given time axis;
step S130: aligning the sequence of video frames and the sequence of audio frames according to the time offset;
step S140: and synthesizing the video based on the aligned video frame sequence and audio frame sequence.
The front end and the back end in this embodiment are connected through a network, which may be a local area network or the internet.
The front end comprises various terminal devices; these front-end devices may be run with online tools for video online editing, including but not limited to browsers, for example.
The back-end includes one or more servers.
The terminal includes but is not limited to: a mobile phone, a tablet computer, or a wearable device, etc.
In the process of video online editing, a front end selects materials based on user operation, previews videos, and finally synthesizes the final videos through a rear end.
The sequence of video frames comprises: a plurality of images, which are sequentially ordered according to the playing order of the video frames.
The sequence of frames includes: a plurality of audio frames, the audio frames being sequentially ordered according to an audio playback order.
In this embodiment, the time offset is: the amount of temporal offset of the video frame sequence and the audio frame sequence on the same time axis.
Fig. 2 is a diagram showing the time offsets of a video frame sequence and an audio frame sequence on the same time axis.
In some embodiments, as shown in fig. 2, the time offset is: an amount of time offset between a first video frame of the sequence of video frames and a first audio frame of the sequence of audio frames.
In this embodiment, after receiving the video material, the back end determines the time offset in the same manner as the front end performs the time offset between the video frame sequence and the audio frame sequence during the preview. The back end aligns the video frame and the audio frame based on the time offset, so as to ensure that the actual playing effect and the preview effect of the finally synthesized video are consistent, reduce the dislocation phenomenon of the video frame and the audio frame and ensure the online editing effect of the video.
In summary, in the present embodiment, in the online video editing process, the backend does not need to perform transcoding, so that various problems caused by transcoding are reduced.
In some embodiments, a time offset between the sequence of video frames and the sequence of audio frames is determined on a time scale of a given timeline as the video frames are rendered by the front end frame by frame in a preview window.
A given timeline herein may be a timeline known to both the front end and the back end. If the given time axes with the same time precision value are adopted for the front-end preview and the rear-end video synthesis, the consistency of the video preview effect and the final synthesized effect can be further ensured.
The method comprises the steps of unfolding each video frame and each audio frame of the audio frames in a video frame sequence on a time axis, obtaining time scales of the audio frames in the video frames and the audio frames in the video frame sequence on a given time axis, and determining the time offsets by combining the offsets of the corresponding video frames and the audio frames on the given time axis when the video frames and the audio frames need to be aligned.
Receiving a video material containing a video frame sequence and an audio frame sequence sent by a front end, aligning the video frame sequence and the audio frame sequence on a given time axis according to a time offset, so that a video frame and an audio frame played at the same time point are synthesized in step S140 after being aligned; the phenomena of dislocation of video frames, audio frames and the like caused by misalignment are reduced, and the online video editing effect is ensured. Due to the received time offset in this embodiment, transcoding of at least one of the sequence of video frames and the sequence of audio frames is not required, reducing various problems due to transcoding.
In the embodiment of the present invention, the time offset may be: the absolute time offset amount on a given time axis may also be based on the number of offset frames to which the frame rate is converted, or the like.
In some embodiments, the method further comprises: and synchronizing the frame rate of the video with the front end, wherein the frame rate is the frame rate of video preview performed by the front end.
The frame rate of the video synchronized with the front end comprises: the front end sends the frame rate of video preview to the back end; or the back end sends the video composite frame rate to the front end.
In some embodiments, as shown in fig. 3, the method further comprises:
step S121: when the actual frame rate of the received video frame sequence is different from the synchronous frame rate, adjusting the frame rate of the video frame sequence;
the step S13-may specifically include:
and aligning the video frame sequence and the audio frame sequence which are adjusted to be synchronous frame rates according to the time offset.
In some embodiments, the step S121 may include: when the actual frame rate of the received video frame sequence is greater than the synchronous frame rate, adjusting the frame rate of the video frame sequence in a frame extraction mode; and/or when the actual frame rate of the received video frame sequence is less than the synchronous frame rate, adjusting the frame rate of the video frame sequence in a frame complementing mode.
As shown in fig. 4, the conversion of the actual frame rate of the video frame sequence into the synchronous frame rate is performed by a frame decimation method.
As shown in fig. 5, the actual frame rate of the video frame sequence is converted into the synchronous frame rate by the frame complementing method.
As shown in fig. 6, the present embodiment provides a video online editing apparatus, including:
a receiving module 61, configured to receive a video material that includes a video frame sequence and an audio frame sequence and is sent by a front end;
a determining module 62 for determining the video frame sequence and the audio frame sequence, time offsets on a given time axis;
an alignment module 63, configured to align the video frame sequence and the audio frame sequence according to the time offset;
and an alignment module 64 for synthesizing a video based on the aligned video frame sequence and audio frame sequence.
In some embodiments, the apparatus further comprises:
and the synchronization module is used for synchronizing the frame rate of the video with the front end, wherein the frame rate is the frame rate of the front end video preview.
In some embodiments, the apparatus further comprises:
the adjusting module is used for adjusting the frame rates of the video frame sequences when the actual frame rates of the received video frame sequences are different from the synchronous frame rates;
the alignment module is specifically configured to align the video frame sequence and the audio frame sequence adjusted to the synchronous frame rate according to the time offset.
In some embodiments, the adjusting module is specifically configured to adjust the frame rates of the received sequence of video frames by frame decimation when the actual frame rates of the sequence of video frames are greater than the synchronous frame rate.
In some embodiments, the adjusting module is specifically configured to adjust the frame rates of the sequence of video frames by using a frame complementing manner when the actual frame rate of the received sequence of video frames is less than the synchronous frame rate.
Several specific examples are provided below in connection with any of the embodiments described above:
example 1:
the present example provides a method for online video editing that keeps online video editing front-end previews and back-end composite content consistent without transcoding video material. Under the existing framework comprising a front end and a back end, the time offset added to the video frame sequence by the front end is calculated and increased in a composition server (namely the back end), and then the same set of time axis standards are adopted for front end rendering and back end composition so as to achieve the effect of consistent preview and composition.
Example 2:
the present example provides a video online editing method, including:
when a browser at the front end plays a video material, for audio and video synchronization, a time offset is added to the front end when a timestamp of a video image is analyzed, and the time offset needs to be calculated by the synthesis server in a manner similar to that of the time offset calculated by the front end, so that images at the same time point of the front end and the rear end are consistent.
The front-end preview and the back-end composition use the same frame rate. The frame rate refers to a frame rate (rate) at which bitmap images appear continuously on the display in units of frames. Different materials may have different frame rates.
The method provided by the present example may specifically include the following steps:
(1) determining a time axis time precision value: calculating a time interval between two frames of data according to the frame rate of the composite video, and using the time interval as a precision value of a time axis;
(2) front end preview: rendering the preview window frame by frame according to the time scale on a given time axis;
(3) back-end synthesis: and adjusting the frame rate of the material, extracting frames when the original frame rate is higher than the target frame rate, and supplementing frames when the original frame rate is lower than the target frame rate. As shown in fig. 4 and 5.
Through the above operation, the front-end preview and the back-end synthesized content are kept consistent.
Calculating and adding a front-end consistent time offset in a back-end composition service
In short, the back-end composition service calculates and adds a time offset that is consistent with the front end, and previews and adjusts the material frame sequence by using a uniform time-accurate time axis.
The present embodiment further provides a computer storage medium, wherein a computer program is stored in the computer storage medium, and when being executed by a processor, the computer program implements the video online editing method provided in any of the foregoing technical solutions; for example, at least one of the methods shown in fig. 1 and 3.
The present embodiment also provides an electronic device, including: a processor and a memory for storing a computer program capable of running on the processor; when the processor is used to run the computer program, the video mosaic generating method provided by any of the foregoing technical solutions is implemented, for example, at least one of the methods shown in fig. 1 and fig. 3.
The electronic device may further include: at least one network interface. The various components in the electronic device are coupled together by a bus system. It will be appreciated that a bus system is used to enable communications among the components. The bus system includes a power bus, a control bus, and a status signal bus in addition to a data bus. But for clarity of illustration.
The memory may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic random access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical disk, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), Synchronous Dynamic Random Access Memory (SLDRAM), Direct Memory (DRmb Access), and Random Access Memory (DRAM). The described memory for embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
The memory in embodiments of the present invention is used to store various types of data to support the operation of the electronic device. Examples of such data include: any computer program for operating on an electronic device, such as an operating system and application programs. The operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application programs may include various application programs for implementing various application services. Here, the program that implements the method of the embodiment of the present invention may be included in an application program.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (12)
1. A video online editing method is applied to a back end connected with a front end network, and comprises the following steps:
receiving a video material which contains a video frame sequence and an audio frame sequence and is sent by a front end;
after receiving a video material, determining the time offset of the video frame sequence and the audio frame sequence on a given time axis according to the same way of calculating the time offset between the video frame sequence and the audio frame sequence during front-end preview; wherein the front end determines the time offset in a manner that: determining a time offset between the sequence of video frames and the sequence of audio frames according to a time scale of a given time axis when the video frames are rendered frame by frame in a preview window, wherein the given time axis is as follows: a timeline known to both the front end and the back end;
aligning the sequence of video frames and the sequence of audio frames on the given timeline according to the time offset to keep the front-end preview and the back-end synthesized content consistent; and synthesizing the video based on the aligned video frame sequence and audio frame sequence.
2. The method of claim 1, further comprising:
and synchronizing the frame rate of the video with the front end, wherein the frame rate is the frame rate of the front end video preview.
3. The method of claim 2, further comprising:
when the actual frame rate of the received video frame sequence is different from the synchronous frame rate, adjusting the frame rate of the video frame sequence;
said aligning the sequence of video frames and the sequence of audio frames according to the time offset comprises:
and aligning the video frame sequence and the audio frame sequence which are adjusted to synchronous frame rates according to the time offset.
4. The method of claim 3, wherein adjusting the frame rates of the sequence of video frames when the actual frame rates of the sequence of received video frames are different from the synchronized frame rates comprises:
when the actual frame rate of the received video frame sequence is larger than the synchronous frame rate, the frame rate of the video frame sequence is adjusted in a frame extraction mode.
5. The method of claim 3 or 4, wherein adjusting the frame rates of the sequence of video frames when the actual frame rates of the received sequence of video frames are different from the synchronized frame rates comprises:
and when the actual frame rate of the received video frame sequence is less than the synchronous frame rate, adjusting the frame rate of the video frame sequence in a frame supplementing mode.
6. An apparatus for video online editing, applied to a backend connected to a front-end network, the apparatus comprising:
the receiving module is used for receiving a video material which contains a video frame sequence and an audio frame sequence and is sent by a front end;
the determining module is used for determining the time offset of the video frame sequence and the audio frame sequence on a given time axis according to the same mode of calculating the time offset between the video frame sequence and the audio frame sequence during front-end preview after receiving the video material; wherein the front end determines the time offset in a manner that: determining a time offset between the sequence of video frames and the sequence of audio frames according to a time scale of a given time axis when the video frames are rendered frame by frame in a preview window, wherein the given time axis is as follows: a timeline known to both the front end and the back end;
an alignment module for aligning the sequence of video frames and the sequence of audio frames on the given time axis according to the time offset so that the front-end preview and the back-end synthesized content remain consistent;
and the synthesis module is used for synthesizing the video based on the aligned video frame sequence and audio frame sequence.
7. The apparatus of claim 6, further comprising:
and the synchronization module is used for synchronizing the frame rate of the video with the front end, wherein the frame rate is the frame rate of the front end video preview.
8. The apparatus of claim 7, further comprising:
the adjusting module is used for adjusting the frame rates of the video frame sequences when the actual frame rates of the received video frame sequences are different from the synchronous frame rates;
the alignment module is specifically configured to align the video frame sequence and the audio frame sequence adjusted to the synchronous frame rate according to the time offset.
9. The apparatus according to claim 8, wherein the adjusting module is specifically configured to adjust the frame rates of the received sequence of video frames by frame decimation when the actual frame rates are greater than the synchronous frame rate.
10. The apparatus according to claim 8 or 9, wherein the adjusting module is specifically configured to adjust the frame rates of the received sequence of video frames by frame-complementing when the actual frame rates of the sequence of video frames are smaller than the synchronized frame rate.
11. An electronic device, comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is configured to implement the video online editing method according to any one of claims 1 to 5 when running the computer program.
12. A computer storage medium having a computer program stored therein, wherein the computer program, when executed by a processor, implements the video online editing method of any of claims 1 to 5.
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