CN113207021A - Audio and video synchronization method and device, terminal equipment and storage medium - Google Patents
Audio and video synchronization method and device, terminal equipment and storage medium Download PDFInfo
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- CN113207021A CN113207021A CN202110355309.2A CN202110355309A CN113207021A CN 113207021 A CN113207021 A CN 113207021A CN 202110355309 A CN202110355309 A CN 202110355309A CN 113207021 A CN113207021 A CN 113207021A
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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
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR 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]
- H04N21/40—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
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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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
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4344—Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
Abstract
The invention discloses an audio and video synchronization method, an audio and video synchronization device, a storage medium and a terminal device, wherein the method comprises the following steps: determining the first time of the input audio and video according to a preset standard time track; acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video; and adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous. The invention compares and analyzes the audio frame playing time and the video frame display time in the audio and video, thereby adjusting the video frame display time, synchronizing the audio time and the display time and realizing the audio and video synchronization.
Description
Technical Field
The invention relates to the technical field of audio and video processing, in particular to an audio and video synchronization method, an audio and video synchronization device, terminal equipment and a storage medium.
Background
With the development of the existing internet of things technology, more and more intelligent devices with screens need screen recording, such as application scenes of television screen recording, intelligent security and protection, conference relay and the like, but video sources of the scenes are realized according to different platforms and different frames, so that quite large differences may exist, but for the scenes of screen recording and screen relay, audio and video synchronization is an important judgment factor, if the adaptation conditions of some video sources are not good, the situation that the videos do not have stable timestamps occurs, so that the situation that sound and pictures are not synchronized can be caused, and effective audio and video synchronization can not be realized.
Thus, there is a need for improvements and enhancements in the art.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an audio and video synchronization method, apparatus, terminal device and storage medium, aiming at solving the problem that effective audio and video synchronization cannot be realized in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides an audio and video synchronization method, where the method includes:
determining the first time of the input audio and video according to a preset standard time track;
acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video;
and adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous.
In one implementation, the determining a first time of the input audio and video according to a preset standard time track includes:
acquiring the input time of the audio and video;
and comparing the input time with the standard time of the standard time track to determine the initial of the audio and video, wherein the standard time track is a preset time axis.
In one implementation, the comparing the input time with a standard time of the standard time track to determine a first time of the audio-video includes:
if the input time is greater than the standard time, moving the audio and video track backward for a preset time;
and determining the first time of the audio and video according to the audio and video track shifted backwards by the preset time.
In one implementation, the comparing the input time with a standard time of the standard time track to determine a first time of the audio-video includes:
if the input time is less than the standard time, accelerating the audio and video track for a preset time;
and determining the first time of the audio and video according to the audio and video track after the preset time is accelerated.
In one implementation manner, the acquiring, according to the first time of the audio and video, the display time of a video frame and the play time of an audio frame corresponding to the video frame includes:
when the first time of the audio and video is determined, acquiring the relative position between the video frame and the audio frame;
and determining the display time of the video frame and the playing time of the audio frame corresponding to the video frame according to the relative position.
In one implementation, the adjusting the display time of the video frame according to the display time and the play time so that the display time is synchronized with the play time includes:
when the display time is longer than the playing time, compressing the display time of the video frame;
and when the display time is less than the playing time, prolonging the display time of the video frame.
In one implementation, the adjusting the display time of the video frame according to the display time and the play time so that the display time is synchronized with the play time includes:
and when the display time is less than the playing time, discarding a plurality of frames in the video frames to ensure that the display time is synchronous with the playing time.
In a second aspect, an embodiment of the present invention further provides an audio and video synchronization apparatus, where the apparatus includes:
the first time determining module is used for determining the first time of the input audio and video according to a preset standard time track;
the audio and video time determining module is used for acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video;
and the audio and video synchronization module is used for adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time to be synchronous with the playing time.
In a third aspect, an embodiment of the present invention further provides a terminal device, where the terminal device includes a memory, a processor, and an audio/video synchronization program that is stored in the memory and is executable on the processor, and when the processor executes the audio/video synchronization program, the steps of the audio/video synchronization method in any one of the above schemes are implemented.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where an audio and video synchronization program is stored on the computer-readable storage medium, and when the audio and video synchronization program is executed by a processor, the steps of the audio and video synchronization method in any of the above schemes are implemented.
Has the advantages that: compared with the prior art, the invention provides an audio and video synchronization method, which comprises the following steps: determining the first time of the input audio and video according to a preset standard time track; acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video; and adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous. The invention compares and analyzes the audio frame playing time and the video frame display time in the audio and video, thereby adjusting the video frame display time, synchronizing the audio time and the display time and realizing the audio and video synchronization.
Drawings
Fig. 1 is a flowchart of a specific implementation of an audio and video synchronization method according to an embodiment of the present invention.
Fig. 2 is an ideal state diagram of audio and video synchronization of the audio and video synchronization method provided by the embodiment of the present invention.
Fig. 3 is an audio and video synchronization effect diagram of the audio and video synchronization method provided by the embodiment of the invention.
Fig. 4 is a schematic block diagram of an audio and video synchronization apparatus provided in an embodiment of the present invention.
Fig. 5 is a schematic block diagram of an internal structure of a terminal device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in 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.
With the development of the existing internet of things technology, more and more intelligent devices with screens need screen recording, such as application scenes of television screen recording, intelligent security and protection, conference relay and the like, but video sources of the scenes are realized according to different platforms and different frames, so that quite large differences may exist, but for the scenes of screen recording and screen relay, audio and video synchronization is an important judgment factor, if the adaptation conditions of some video sources are not good, the situation that the videos do not have stable timestamps occurs, so that the situation that sound and pictures are not synchronized can be caused, and effective audio and video synchronization can not be realized.
In order to solve the problem of the prior art, the embodiment provides an audio and video synchronization method, and in specific implementation, the embodiment first determines a first time of an input audio and video according to a preset standard time track. And then according to the first time of the audio and video, acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame. And finally, adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous. In the embodiment, the playing time of the audio frame and the display time of the video frame in the audio and video are compared and analyzed, so that the display time of the video frame is adjusted, the audio time and the display time are synchronized, and the audio and video synchronization is realized.
Exemplary method
The audio and video synchronization method of the embodiment is applied to terminal equipment, and the terminal equipment is display equipment which can be used for playing audio and video, such as a television and a computer. The audio and video synchronization method comprises the following steps:
and S100, determining the first time of the input audio and video according to a preset standard time track.
In this embodiment, since human audio is sensitive to being toggled and audio output is stable, the audio is kept at a fixed output frequency, and then the video is adjusted according to the audio rate. For this purpose, the embodiment presets a standard time track, which is a preset time axis. When the audio and video are input, the embodiment acquires the input time of the audio and video, compares the input time with the standard time track, and then determines the first time. Because the standard time orbit in the embodiment is used for measuring whether the audio and video is integrally too fast or too slow, the audio and video needs to be integrally adjusted whether the audio and video is integrally too slow or too fast. Specifically, if the input time is greater than the standard time, it indicates that the whole audio and video is too fast at this time, and therefore the audio and video track is shifted backward by a preset time, and therefore the first time of the audio and video is determined according to the audio and video track shifted backward by the preset time in this embodiment. If the input time is less than the standard time, the audio and video is slow down integrally, so that the audio and video track is accelerated for a preset time, and the first time of the audio and video is determined according to the audio and video track accelerated for the preset time. In one implementation, the preset time may be an elastic time, that is, when the difference between the input time and the standard time is small, the audio and video is controlled to move for a small preset time, and if the difference between the input time and the standard time is large, the audio and video is controlled to move for a small preset time.
And S200, acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video.
In this embodiment, after determining the first time of the audio and video, the embodiment acquires the relative position between the video frame and the audio frame. And then determining the display time of the video frame and the playing time of the audio frame corresponding to the video frame according to the relative position. Since the audio in this embodiment is used as a reference and is a fixed output frequency, and the display time of the video frame is adjusted based on the playing time of the audio frame, after the first time of the audio and video, the embodiment starts to acquire the display time of the video frame and the playing time of the audio frame corresponding to the video frame, so as to adjust the display time of the video frame in the subsequent steps.
Step S300, adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous.
In the present embodiment, since the video frame and the audio frame do not correspond one-to-one, and the audio frame corresponds to the standard time track and serves as a reference, the playing time of the audio frame is consistent with the time of the standard time track. Therefore, when the display time of the video frame is different from the playing time of the audio frame, the display time of the video frame needs to be adjusted, so that the display time of the video frame is synchronized with the playing time of the audio frame. Specifically, when the display time is longer than the playing time, the display time of the video frame is compressed; when the display time is shorter than the playing time, the display time of the video frame is extended, and when the display time is extended, the display time is extended in an equal proportion extension mode, and similarly, when the display time is compressed, the display time is shortened in an equal proportion compression mode. In this embodiment, the display time of the video frame is represented by the frame number of the video frame, and when the difference between the video frame number of the display time and the video frame number of the standard time track is large, the display time of the video frame needs to be adjusted, as shown in table 1.
In this embodiment, the proportional values of the proportional algorithm shortening and the proportional extension are obtained according to the actual motherboard, and the parameters are dynamically adjusted according to the proportional values, where a positive value is the video frame number of the current video frame whose display time frame output speed is faster than the standard time track, and a negative value is the video frame number of the current video frame whose display time frame output speed is slower than the standard time track. According to the measurement and calculation of experimental data, data is put into a player coding efficiency curve (namely a relation curve between the size of a frame and coding time), the size of the frame can be associated with scaling, and the adjustment parameters of each frame are set in advance. In one implementation, when the display time is less than the play time, several of the video frames are discarded to ensure that the display time is synchronized with the play time.
As shown in fig. 2, by adopting the ideal state of the audio and video synchronization method in the embodiment, audio and video frames are output at a certain rate, but the actual situation cannot reach the ideal state, so that the stability of display and the synchronization of sound and picture are realized by compressing the frame time and prolonging the frame time. After audio and video synchronization is performed on the sound and the picture, the sound and the picture are re-driven into the audio and video track, as shown in fig. 3, which is equivalent to using a certain amount of audio and video as a chunk to ensure small fluctuation in the chunk, but maintain the stability of the audio and video and the synchronization of the sound and the picture as a whole.
In summary, in this embodiment, the first time of the input audio/video is determined according to the preset standard time track; acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video; and adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous. In the embodiment, the playing time of the audio frame and the display time of the video frame in the audio and video are compared and analyzed, so that the display time of the video frame is adjusted, the audio time and the display time are synchronized, and the audio and video synchronization is realized.
Exemplary devices
As shown in fig. 4, the present embodiment also provides an audio and video synchronization apparatus, including: the device comprises a first time determining module 10, an audio and video time determining module 20 and an audio and video synchronization module 30. Specifically, the first time determining module 10 is configured to determine a first time of the input audio and video according to a preset standard time track. The audio and video time determining module 20 is configured to obtain a display time of a video frame and a playing time of an audio frame corresponding to the video frame according to the first time of the audio and video. The audio and video synchronization module 30 is configured to adjust the display time of the video frame according to the display time and the play time, so that the display time is synchronized with the play time. .
In one implementation, the first time determination module 10 includes:
the input time acquisition unit is used for acquiring the input time of the audio and video;
and the first time acquisition unit is used for comparing the input time with the standard time of the standard time track to determine the first time of the audio and video, wherein the standard time track is a preset time axis.
In one implementation, the audio/video time determination module 20 includes:
the relative position determining unit is used for acquiring the relative position between the video frame and the audio frame after the first time of the audio and video is determined;
and the playing time determining unit is used for determining the display time of the video frame and the playing time of the audio frame corresponding to the video frame according to the relative position.
In one implementation, the audio and video synchronization module 30 includes:
the time compression unit is used for compressing the display time of the video frame when the display time is greater than the playing time;
and the time prolonging unit is used for prolonging the display time of the video frame when the display time is less than the playing time.
In one implementation, the audio and video synchronization module 30 includes:
and the frame discarding unit is used for discarding a plurality of frames in the video frames when the display time is less than the playing time so as to ensure that the display time is synchronous with the playing time.
Based on the above embodiments, the present invention further provides a terminal device, and a schematic block diagram thereof may be as shown in fig. 5. The terminal equipment comprises a processor, a memory, a network interface, a display screen and a temperature sensor which are connected through a system bus. Wherein the processor of the terminal device is configured to provide computing and control capabilities. The memory of the terminal equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the terminal device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement an audio-video synchronization method. The display screen of the terminal equipment can be a liquid crystal display screen or an electronic ink display screen, and the temperature sensor of the terminal equipment is arranged in the terminal equipment in advance and used for detecting the operating temperature of the internal equipment.
It will be understood by those skilled in the art that the block diagram of fig. 5 is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation to the terminal device to which the solution of the present invention is applied, and a specific terminal device may include more or less components than those shown in the figure, or may combine some components, or have different arrangements of components.
In one embodiment, a terminal device is provided, where the terminal device includes a memory, a processor, and an audio/video synchronization program stored in the memory and executable on the processor, and when the processor executes the audio/video synchronization program, the following operation instructions are implemented:
determining the first time of the input audio and video according to a preset standard time track;
acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video;
and adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
In summary, the present invention discloses an audio and video synchronization method, an apparatus, a storage medium and a terminal device, wherein the method comprises: determining the first time of the input audio and video according to a preset standard time track; acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video; and adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous. The invention compares and analyzes the audio frame playing time and the video frame display time in the audio and video, thereby adjusting the video frame display time, synchronizing the audio time and the display time and realizing the audio and video synchronization.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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. An audio and video synchronization method, characterized in that the method comprises:
determining the first time of the input audio and video according to a preset standard time track;
acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video;
and adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time and the playing time to be synchronous.
2. The audio-video synchronization method according to claim 1, wherein the determining a first time of the input audio-video according to a preset standard time trajectory comprises:
acquiring the input time of the audio and video;
and comparing the input time with the standard time of the standard time track to determine the first time of the audio and video, wherein the standard time track is a preset time axis.
3. The audio-video synchronization method of claim 2, wherein the comparing the input time with a standard time of the standard time track to determine a first time of the audio-video comprises:
if the input time is greater than the standard time, moving the audio and video track backward for a preset time;
and determining the first time of the audio and video according to the audio and video track shifted backwards by the preset time.
4. The audio-video synchronization method of claim 2, wherein the comparing the input time with a standard time of the standard time track to determine a first time of the audio-video comprises:
if the input time is less than the standard time, accelerating the audio and video track for a preset time;
and determining the first time of the audio and video according to the audio and video track after the preset time is accelerated.
5. The audio and video synchronization method according to claim 1, wherein the obtaining of the display time of the video frame and the playing time of the audio frame corresponding to the video frame according to the first time of the audio and video comprises:
when the first time of the audio and video is determined, acquiring the relative position between the video frame and the audio frame;
and determining the display time of the video frame and the playing time of the audio frame corresponding to the video frame according to the relative position.
6. The audio and video synchronization method according to claim 1, wherein the adjusting the display time of the video frame according to the display time and the play time so that the display time is synchronized with the play time comprises:
when the display time is longer than the playing time, compressing the display time of the video frame;
and when the display time is less than the playing time, prolonging the display time of the video frame.
7. The audio and video synchronization method according to claim 6, wherein the adjusting the display time of the video frame according to the display time and the play time so that the display time is synchronized with the play time comprises:
and when the display time is less than the playing time, discarding a plurality of frames in the video frames to ensure that the display time is synchronous with the playing time.
8. An audio-video synchronization apparatus, characterized in that the apparatus comprises:
the first time determining module is used for determining the first time of the input audio and video according to a preset standard time track;
the audio and video time determining module is used for acquiring the display time of a video frame and the playing time of an audio frame corresponding to the video frame according to the first time of the audio and video;
and the audio and video synchronization module is used for adjusting the display time of the video frame according to the display time and the playing time so as to enable the display time to be synchronous with the playing time.
9. A terminal device, characterized in that the terminal device comprises a memory, a processor and an audio/video synchronization program stored in the memory and operable on the processor, and the processor implements the steps of the audio/video synchronization method according to any one of claims 1 to 7 when executing the audio/video synchronization program.
10. A computer-readable storage medium, having stored thereon an audio-video synchronization program which, when executed by a processor, performs the steps of the audio-video synchronization method according to any one of claims 1 to 7.
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| CN111063376A (en) * | 2019-12-13 | 2020-04-24 | 厦门市美亚柏科信息股份有限公司 | Method, terminal equipment and storage medium for audio and video synchronization in MP4 repairing |
| CN111641858A (en) * | 2020-04-29 | 2020-09-08 | 上海推乐信息技术服务有限公司 | Audio and video synchronization method and system |
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