CN107295352B - Video compression method, device, equipment and storage medium - Google Patents

Video compression method, device, equipment and storage medium Download PDF

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Publication number
CN107295352B
CN107295352B CN201710447169.5A CN201710447169A CN107295352B CN 107295352 B CN107295352 B CN 107295352B CN 201710447169 A CN201710447169 A CN 201710447169A CN 107295352 B CN107295352 B CN 107295352B
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video
compressed
compression
key
playing time
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CN107295352A (en
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佟野
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Beijing Milaiwu Network Technology Co ltd
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Beijing Milaiwu Network Technology Co ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/172Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a picture, frame or field
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

The embodiment of the invention discloses a video compression method, a video compression device, video compression equipment and a storage medium. The video compression method comprises the following steps: splitting a video to be compressed according to the key frames to obtain at least two video clips; compressing each video clip according to a preset compression rule to obtain at least two video compressed clips with the same playing time; and synthesizing the video compression fragments to obtain a compressed video. The embodiment of the invention compresses according to the preset compression rule to obtain the video compression fragment, synthesizes the video compression fragment to obtain the compressed video, and solves the problems that the playing time of key information in the compressed video is short or the playing time of the transition information is long due to the fact that the number of transition frames between key frames is fixed by the conventional video compression method, so that the playing time of the key information is selectively increased, the playing time of the transition information is reduced, and more key information is displayed in the same playing time.

Description

Video compression method, device, equipment and storage medium
Technical Field
The present invention relates to multimedia information processing technologies, and in particular, to a video compression method, apparatus, device, and storage medium.
Background
With the development of mobile devices such as smart phones, tablet computers and electronic readers, multimedia data is widely used in mobile terminals.
Since the network environment of the mobile terminal is variable and complex, and the available bandwidth is easily limited, when the mobile terminal needs to download or upload a video file with a large data volume to the network side, the video file is usually compressed.
The existing video compression method can fix the number of transition frames between key frames, so that the problem that the playing time of key information in a compressed video is short or the playing time of transition information is long is caused.
Disclosure of Invention
The invention provides a video compression method, a video compression device, video compression equipment and a storage medium, which are used for playing more effective contents in a video.
In a first aspect, an embodiment of the present invention provides a video compression method, which specifically includes:
splitting a video to be compressed according to the key frames to obtain at least two video clips;
compressing each video clip according to a preset compression rule to obtain at least two video compressed clips with the same playing time;
and synthesizing the video compression fragments to obtain a compressed video.
Further, before splitting the video to be compressed according to the key frame to obtain at least two video segments, the method further includes:
the method comprises the steps of obtaining a video to be compressed uploaded by a user, and extracting key frames from the video to be compressed through key frame identification.
Further, before splitting the video to be compressed according to the key frame to obtain at least two video segments, the method further includes:
the method comprises the steps of obtaining a video to be compressed uploaded by a user, and identifying key frames in the video to be compressed by using a mode identification method.
Further, the splitting of the video to be compressed according to the key frame to obtain at least two video segments specifically includes:
and splitting the transition frame into at least two transition frame groups by taking the key frame as a splitting node, and taking each transition frame group and the key frame corresponding to the splitting node at the front side of the transition frame group as a video clip.
Further, before splitting the video to be compressed according to the key frame to obtain at least two video segments, the method further includes:
determining the standard playing time length and the number of key frames of the video to be compressed;
and calculating the playing time length of the video compressed segment according to the standard playing time length and the number of the key frames.
In a second aspect, an embodiment of the present invention further provides a video compression apparatus, where the video compression apparatus includes:
the video splitting module is used for splitting a video to be compressed according to the key frames to obtain at least two video clips;
the video compression module is used for compressing each video clip according to a preset compression rule to obtain at least two video compression clips with the same playing time length;
and the video synthesis module is used for synthesizing the video compression fragments to obtain a compressed video.
Further, the video compression apparatus further includes: and the key frame extraction module is used for acquiring a video to be compressed uploaded by a user and extracting key frames from the video to be compressed through key frame identification.
Further, the video compression apparatus further includes: and the key frame identification module is used for acquiring the video to be compressed uploaded by the user and identifying the key frames in the video to be compressed by using a mode identification method.
Further, the video splitting module further includes:
and the video clip selecting unit divides the transition frame into at least two transition frame groups by taking the key frame as a dividing node, and takes each transition frame group and the key frame corresponding to the dividing node at the front side of the transition frame group as a video clip.
Further, the video compression apparatus further includes: the video compression associated information determining module is used for determining the standard playing time length and the number of key frames of the video to be compressed;
and the playing time length calculating module is used for calculating the playing time length of the video compressed segment according to the standard playing time length and the number of the key frames.
In a third aspect, an embodiment of the present invention further provides an apparatus, which specifically includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a video compression method as described in embodiments of the invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, specifically including: the program, when executed by a processor, implements a video compression method as described in any of the embodiments of the present invention.
The embodiment of the invention compresses according to the preset compression rule to obtain the video compression fragment, synthesizes the video compression fragment to obtain the compressed video, and solves the problems that the playing time of key information in the compressed video is short or the playing time of the transition information is long due to the fact that the number of transition frames between key frames is fixed by the conventional video compression method, so that the playing time of the key information is selectively increased, the playing time of the transition information is reduced, and more key information is displayed in the same playing time.
Drawings
Fig. 1 is a flow chart of a video compression method according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a video compression method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a video compression apparatus according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a video compression apparatus in a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a video compression method according to an embodiment of the present invention, where the present embodiment is applicable to a situation of compressing a video, the method may be executed by a video compression apparatus, and specifically includes the following steps:
and S110, splitting the video to be compressed according to the key frame to obtain at least two video clips.
The video to be compressed is an operation object of the video compression method in this embodiment, and the video to be compressed can be uploaded to a server by a user, where the video compression method in this embodiment is executed in the server; optionally, the video with compression may also be a video file downloaded to the terminal by the user through the network, and at this time, the video compression method described in this embodiment may be executed at the terminal.
The key frame is a picture in the video with compression. Specifically, the video to be compressed includes a key frame and a transition frame, where the key frame is also called an i frame, and is the most important frame of inter-frame compression coding, and is used to represent a key picture (effective content) in the video to be compressed, and may be a transition of an action in the picture; the frame image between the key frames is a transition frame, which is used to connect the key pictures in the compressed video, and can be a connection picture of action break.
The key frames comprise a plurality of transition frames, and can be set according to the action turning amplitude between adjacent key frame images; optionally, the action turning amplitude between adjacent key frame images may be identified by using a pattern identification method, so as to determine the number of transition frames between each key frame.
And S120, compressing each video clip according to a preset compression rule to obtain at least two video compression clips with the same playing time length.
The video compression fragment is obtained by compressing the video fragment. The preset compression rule is used for compressing the video clip into a video compression clip; different compression rules may be selected according to specific requirements in specific embodiments.
Illustratively, the video can be compressed by a compression rule of reducing the number of frame images in the video clip, so as to shorten the playing time of the video; the number of frame images in the video clip can be reduced, and meanwhile, the compression rule of pixel data in each frame image is reduced to compress the video, so that the data volume and the playing time of the video are reduced.
When compressing a video clip in the video compression method described in this embodiment, the video clip is split according to a key frame in the video clip to obtain at least two intermediate frame clips, and the intermediate frame clips are compressed respectively to obtain at least two video compression clips.
And S130, synthesizing the video compression fragments to obtain a compressed video.
Wherein, the compressed video is the result video obtained by the video compression method. In the synthesizing process, the present embodiment may synthesize the video compression segments in the display period of the expected synthesis result according to specific requirements, and specifically, add a transition special effect in the display period of the video compression segments in an overlapping manner, so as to increase the continuity between the video compression segments and improve the ornamental property of the compressed video.
The embodiment of the invention compresses according to the preset compression rule to obtain the video compression fragment, synthesizes the video compression fragment to obtain the compressed video, and solves the problems that the playing time of key information in the compressed video is short or the playing time of the transition information is long due to the fact that the number of transition frames between key frames is fixed by the conventional video compression method, so that the playing time of the key information is selectively increased, the playing time of the transition information is reduced, and more key information is displayed in the same playing time.
Example two
Fig. 2 is a flowchart of a video compression method according to an embodiment of the present invention, where the embodiment identifies a frame image of a key frame by using a pattern recognition method based on the above embodiment, and specifically includes the following steps:
s210, obtaining a video to be compressed uploaded by a user, and extracting a key frame from the video to be compressed through a key frame identifier.
The key frame identification is used for identifying key frames in frame images in the video to be compressed. Specifically, in this embodiment, a key frame image in the video to be compressed may be marked by using a key frame identifier, a mapping relationship between the key frame identifier and the key frame image is established, and the key frame identifier, the mapping relationship between the key frame identifier and the key frame image are stored together in the video to be detected and uploaded to the server.
Optionally, the key frame acquisition method may also be performed by a pattern recognition method, specifically: before splitting the video to be compressed according to the key frame to obtain at least two video clips, the method further comprises the following steps: the method comprises the steps of obtaining a video to be compressed uploaded by a user, and identifying key frames in the video to be compressed by using a mode identification method.
Illustratively, when the motion turning between the adjacent frame images is recognized to be large by using the pattern recognition method, the original number of the transition frames between the adjacent frame images is maintained, and when the motion turning between the adjacent frame images is recognized to be small, the number of the transition frames between the adjacent frame images is reduced. The method has the advantages that the action turning between the key frame images can be more accurately identified, and the proportion of effective contents in the compressed video is improved by changing the number of the transition frames, so that the playing effect of the compressed video is more smooth.
S220, determining the standard playing time length and the number of key frames of the video to be compressed.
In order to calculate the playing time of the video compression segments more accurately, the present embodiment may determine in advance that the video to be compressed uploaded by the user is the standard playing time and the number of the key frames, and further calculate the playing time of each video compression segment.
Optionally, the number of the key frames may be obtained by counting the number of the key frame identifiers, and the standard playing time may also be obtained by counting the total number of the images of the video to be compressed.
And S230, calculating the playing time length of the video compressed segment according to the standard playing time length and the number of the key frames.
Specifically, the playing duration of the compressed video is obtained through calculation according to the standard playing duration and the preset compression ratio, and the video compressed segment is obtained through calculation according to the playing duration of the compressed video and the number of key frames.
Optionally, the playing time of the compressed video may also be preset by the user. Preferably, the playing time of the compressed video is 15 s.
And S240, splitting the transition frame into at least two transition frame groups by taking the key frame as a splitting node, and taking each transition frame group and the key frame corresponding to the splitting node at the front side of the transition frame group as a video clip.
Wherein, all transition frames between adjacent key frames can be included in the transition frame group. A plurality of transition frames are included between every two adjacent key frames, and the detection video is compressed by reducing the transition frames between the key frames in the embodiment. Each video segment includes at least one transition frame and a split node.
And S250, compressing each video clip according to a preset compression rule to obtain at least two video compression clips with the same playing time length.
And S260, synthesizing the video compression fragments to obtain a compressed video.
In the synthesizing process, the embodiment may first arrange the identifiers of the frame images in the video compressed segment, and then synthesize the compressed video according to the arrangement result and the mapping relationship between the frame images and the frame identifiers.
According to the technical scheme of the embodiment, the adjacent frame images are identified by using the pattern identification method, the action turning between the key frame images can be identified more accurately, and the ratio of effective contents in the compressed video is improved by changing the number of the transition frames, so that the playing effect of the compressed video is ensured to be smoother.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a video compression apparatus according to a third embodiment of the present invention, and as shown in fig. 3, the video compression apparatus includes: a video splitting module 310, a video compression module 320, and a video compositing module 330.
The video splitting module 310 is configured to split a video to be compressed according to the key frame to obtain at least two video segments;
the video compression module 320 is configured to compress each video segment according to a preset compression rule to obtain at least two video compression segments with the same playing time duration;
and the video synthesizing module 330 is configured to synthesize the video compression segments to obtain a compressed video.
The embodiment of the invention compresses according to the preset compression rule to obtain the video compression fragment, synthesizes the video compression fragment to obtain the compressed video, and solves the problems that the playing time of key information in the compressed video is short or the playing time of the transition information is long due to the fact that the number of transition frames between key frames is fixed by the conventional video compression method, so that the playing time of the key information is selectively increased, the playing time of the transition information is reduced, and more key information is displayed in the same playing time.
On the basis of the foregoing embodiments, the video compression apparatus further includes:
and the key frame extraction module is used for acquiring a video to be compressed uploaded by a user and extracting key frames from the video to be compressed through key frame identification.
On the basis of the foregoing embodiments, the video compression apparatus further includes:
and the key frame identification module is used for acquiring the video to be compressed uploaded by the user and identifying the key frames in the video to be compressed by using a mode identification method.
On the basis of the foregoing embodiments, the video splitting module 310 further includes:
and the video clip selecting unit divides the transition frame into at least two transition frame groups by taking the key frame as a dividing node, and takes each transition frame group and the key frame corresponding to the dividing node at the front side of the transition frame group as a video clip.
On the basis of the foregoing embodiments, the video compression apparatus further includes:
the video compression associated information determining module is used for determining the standard playing time length and the number of key frames of the video to be compressed;
and the playing time length calculating module is used for calculating the playing time length of the video compressed segment according to the standard playing time length and the number of the key frames.
The video compression device provided by the embodiment of the invention can execute the video compression method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 4 is a schematic structural diagram of a server according to a fourth embodiment of the present invention, as shown in fig. 4, the server includes a processor 40, a memory 41, an input device 42, and an output device 43; the number of the processors 40 in the server may be one or more, and one processor 40 is taken as an example in fig. 4; the processor 40, the memory 41, the input device 42 and the output device 43 in the server may be connected by a bus or other means, and the bus connection is exemplified in fig. 4.
The memory 41, which is a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules, such as program modules corresponding to the video compression method in the embodiment of the present invention (for example, the video splitting module 310, the video compression module 320, and the video compositing module 330 in the video compression apparatus). The processor 40 executes various functional applications of the device/terminal/server and data processing, i.e., implements the above-described video compression method, by running software programs, instructions, and modules stored in the memory 41.
The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to a server over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 42 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the server. The output device 43 may include a display device such as a display screen.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a video compression method, the method including:
splitting a video to be compressed according to the key frames to obtain at least two video clips;
compressing each video clip according to a preset compression rule to obtain at least two video compressed clips with the same playing time;
and synthesizing the video compression fragments to obtain a compressed video.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method described above, and may also perform related operations in the video compression method provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the above search apparatus, each included unit and module are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (6)

1. A method of video compression, comprising:
acquiring a video to be compressed uploaded by a user, and extracting a key frame from the video to be compressed through a key frame identifier;
splitting the transition frame into at least two transition frame groups by taking the key frame as a splitting node, and taking each transition frame group and the key frame corresponding to the splitting node at the front side of the transition frame group as a video clip;
compressing each video clip according to a preset compression rule to obtain at least two video compressed clips with the same playing time;
synthesizing the video compression fragments to obtain a compressed video;
before splitting a video to be compressed according to a key frame to obtain at least two video segments, the method further comprises the following steps:
determining the standard playing time length and the number of key frames of the video to be compressed;
and calculating the playing time length of the video compressed segment according to the standard playing time length and the number of the key frames.
2. The video compression method according to claim 1, wherein the splitting of the key frame into at least two transition frame groups for the splitting node, and before the key frame corresponding to the splitting node in front of each transition frame group is taken as a video segment, further comprising:
the method comprises the steps of obtaining a video to be compressed uploaded by a user, and identifying key frames in the video to be compressed by using a mode identification method.
3. A video compression apparatus, comprising:
the key frame extraction module is used for acquiring a video to be compressed uploaded by a user and extracting key frames from the video to be compressed through key frame identifiers;
the video clip selecting unit divides the transition frame into at least two transition frame groups by taking the key frame as a dividing node, and takes each transition frame group and the key frame corresponding to the dividing node at the front side of the transition frame group as a video clip;
the video compression module is used for compressing each video clip according to a preset compression rule to obtain at least two video compression clips with the same playing time length;
the video synthesis module is used for synthesizing the video compression fragments to obtain a compressed video;
the video compression associated information determining module is used for determining the standard playing time length and the number of key frames of the video to be compressed;
and the playing time length calculating module is used for calculating the playing time length of the video compressed segment according to the standard playing time length and the number of the key frames.
4. The video compression apparatus of claim 3, further comprising:
and the key frame identification module is used for acquiring the video to be compressed uploaded by the user and identifying the key frames in the video to be compressed by using a mode identification method.
5. An apparatus, characterized in that the apparatus comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the video compression method of any of claims 1-2.
6. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a video compression method as claimed in any one of claims 1-2.
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