CN109495742B - A video frame coding method, device and equipment - Google Patents

Abstract

The invention discloses a video frame coding method, which comprises the following steps: after receiving the pre-analysis instruction, sampling a frame to be coded in the video to be compressed to obtain a down-sampling frame, pre-analyzing the down-sampling frame to obtain a prediction mode of the down-sampling frame, and storing the prediction mode; after receiving an actual coding instruction, calling a prediction mode corresponding to the frame to be coded from the stored prediction modes to predict the frame to be coded; and after the prediction operation of all frames to be encoded in the video to be compressed is completed, carrying out subsequent encoding operation according to a prediction result to obtain video compression data of the video to be compressed. The invention directly utilizes the prediction mode obtained in the pre-analysis process in the actual coding stage to improve the utilization rate of computing resources and the coding efficiency. The invention also discloses a device, equipment and a computer readable storage medium based on the method.

Description

A video frame coding method, device and equipment

technical field

The invention relates to the technical field of video compression, in particular to a video frame encoding method. The present invention also relates to a video frame encoding device, device and computer-readable storage medium.

Background technique

H.264/AVC is currently the most widely used video compression format. The main means of video compression is to remove redundant information within or between frames through prediction. Prediction is one of the core technologies of video compression. Correspondingly, the two prediction methods of video compression are intra prediction and inter prediction. The intra-frame prediction of H.264 supports 4x4, 8x8, 16x16 and other sizes, and supports intra-frame prediction of luma and chroma.

Pre-analysis is a processing module commonly used by H.264 encoders to approximate the encoding process. For example, the most famous open-source H.264 encoder x264 implements the pre-analysis function collectively called lookahead. Its purpose is to Before the actual encoding, the video to be encoded is down-sampled, and then the down-sampled frame is simulated and analyzed to obtain the complexity of the down-sampled frame, etc.; the pre-analysis process includes frame type judgment, adaptive quantization AQ, mbtree, streamlining 8x8 intra-frame prediction, streamlined ME and other functions. As can be seen from the above, x264 implements simplified 8x8 intra-frame prediction in the lookahead part. After the pre-analysis is completed, the encoder will start the actual encoding process. During this process, intra-frame prediction and other operations must be performed again to determine the intra-frame prediction mode. The calculation process is complicated and the encoding efficiency is low.

Therefore, how to provide a video frame coding scheme with high coding efficiency is a problem that those skilled in the art need to solve.

Contents of the invention

The purpose of the present invention is to provide a video frame coding method, which directly uses the prediction mode obtained in the pre-analysis process in the actual coding stage to improve the utilization rate of computing resources and the efficiency of coding; another purpose of the present invention is to provide a An apparatus, device, and computer-readable storage medium based on the above method.

In order to solve the above technical problems, the present invention provides a video frame encoding method, comprising:

After receiving the pre-analysis instruction, sampling the frame to be encoded in the video to be compressed to obtain a down-sampled frame, performing pre-analysis on the down-sampled frame, obtaining the prediction mode of the down-sampled frame and saving it;

After receiving the actual encoding instruction, call the prediction mode corresponding to the frame to be encoded from the saved prediction mode to predict the frame to be encoded;

After the prediction operation on all the frames to be encoded in the video to be compressed is completed, a subsequent encoding operation is performed according to the prediction result to obtain video compression data of the video to be compressed.

Preferably, the obtained prediction mode of the downsampled frame is stored in the data structure of the frame to be encoded corresponding to the downsampled frame.

Preferably, the obtained prediction mode of the down-sampled frame and the identifier of the frame to be encoded corresponding to the down-sampled frame are correspondingly stored in the prediction mode list.

Preferably, the prediction mode includes an intra prediction mode.

Preferably, the prediction mode includes an intra prediction mode and an inter prediction mode.

Preferably, the down-sampled frame is divided in an 8×8 block division manner.

In order to solve the above technical problems, the present invention also provides a video frame encoding device, including:

The pre-analysis module is used to sample the frame to be encoded in the video to be compressed to obtain a down-sampled frame after receiving the pre-analysis instruction, perform pre-analysis on the down-sampled frame, obtain the prediction mode of the down-sampled frame and save it;

The predictive encoding module is configured to call the prediction mode corresponding to the frame to be encoded from the saved prediction modes to predict the frame to be encoded after receiving the actual encoding instruction;

The subsequent encoding module is configured to perform subsequent encoding operations according to the prediction results after completing the prediction operation on all the frames to be encoded in the video to be compressed, so as to obtain video compression data of the video to be compressed.

In order to solve the above technical problems, the present invention also provides a video frame encoding device, the device includes a memory and a processor, the memory stores a video frame encoding program that can run on the processor, the video When the frame coding program is executed by the processor, the video frame coding method described in any one of the above items is realized.

Preferably, the device is a node forming a content distribution network CDN network or a blockchain network.

In order to solve the above technical problems, the present invention also provides a computer-readable storage medium, on which a video frame coding program is stored, and the video frame coding program can be executed by one or more processors, To realize the video frame encoding method described in any one of the above.

The present invention provides a method for encoding video frames. In this method, during the pre-analysis process, the prediction mode of each frame to be encoded is obtained, and then the prediction mode obtained during the previous pre-analysis is directly used for actual encoding. Each frame to be encoded is predicted, and after the prediction is completed, a subsequent encoding operation is performed to obtain compressed video data. It can be seen that in the present invention, in the actual encoding process, the prediction mode of each frame to be encoded obtained in the previous pre-analysis process is directly used, so that the calculation operation of the prediction mode does not need to be performed again in the actual encoding process, which not only improves the calculation resource The utilization efficiency, and reduce the amount of calculation in the actual encoding process, improve the encoding efficiency. The present invention also provides a device, equipment and computer-readable storage medium based on the above method.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the prior art and the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the flowchart of the process of a kind of video frame encoding method provided by the present invention;

FIG. 2 is a schematic diagram of a 4×4 intra-frame prediction luma block and prediction direction;

FIG. 3 is a schematic diagram of a 4×4 intra-frame prediction mode;

Fig. 4 is a schematic flow chart of a refinement of the pre-analysis process;

FIG. 5 is a schematic structural diagram of a video frame encoding device provided by the present invention.

Detailed ways

The core of the present invention is to provide a video frame encoding method, which directly uses the prediction mode obtained in the pre-analysis process in the actual encoding stage to improve the utilization rate of computing resources and the efficiency of encoding; another core of the present invention is to provide a An apparatus, device, and computer-readable storage medium based on the above method.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

It should be noted that the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features . Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The present invention provides a video frame encoding method, as shown in FIG. 1, and FIG. 1 is a flow chart of the process of a video frame encoding method provided by the present invention; the method includes:

Step s11: After receiving the pre-analysis instruction, sample the frame to be encoded in the video to be compressed to obtain a down-sampled frame, perform pre-analysis on the down-sampled frame, obtain the prediction mode of the down-sampled frame and save it;

Among them, a sample sequence is sampled every few samples, so that the new sequence obtained is the downsampling of the original sequence. Therefore, the downsampled frame is much smaller than the original frame, but the downsampled frame can retain the original frame as much as possible. The distribution characteristics of the element points in the frame, the picture content of the downsampled frame is basically the same as that of the original frame. By analyzing the downsampled frame similar to the original frame in advance, some information based on the characteristics of the original frame, such as complexity, can be obtained in advance, which is convenient for subsequent use.

However, in the current pre-analysis process, although the prediction mode of the downsampled frame is also obtained, this part of the prediction mode is not applied to the subsequent actual encoding process, resulting in a waste of computing resources. Therefore, after the pre-analysis is completed, the present invention saves the obtained prediction modes of the down-sampled frames, and directly uses these prediction modes for encoding in subsequent actual encoding. Since the pictures of the downsampled frame and the frame to be encoded are basically the same, the prediction mode calculated by the downsampled frame has a high correlation with the prediction process in the subsequent actual encoding process, so the pre-analysis module has been calculated directly The introduction of the prediction mode into the subsequent actual encoding prediction process not only improves the utilization of computing resources, but also eliminates the need to calculate the prediction mode in the actual process, thereby simplifying the actual encoding prediction process.

Step s12: After receiving the actual encoding instruction, call the prediction mode corresponding to the frame to be encoded from the saved prediction mode to predict the frame to be encoded;

After receiving the actual encoding instruction, the actual encoding of the frame to be encoded in the video to be compressed will start.

It can be understood that the prediction mode is based on macroblocks, and each frame to be encoded will contain multiple macroblocks, and each macroblock corresponds to a prediction mode. Therefore, the prediction corresponding to the frame to be encoded mentioned in the present invention The mode actually refers to the prediction mode corresponding to each macroblock in the frame to be encoded. Moreover, the prediction mode invoked by each frame to be encoded is the prediction mode calculated from the downsampled frame corresponding to the frame to be encoded during pre-analysis.

Step s13: After the prediction operation of all frames to be encoded in the video to be compressed is completed, subsequent encoding operations are performed according to the prediction results to obtain video compression data of the video to be compressed.

The above-mentioned video frame encoding method provided by the present invention, in this method, in the pre-analysis process, the prediction mode of each frame to be encoded is obtained, and then in the actual encoding, the prediction mode obtained during the previous pre-analysis is directly used for each frame. The frame to be coded is predicted. It can be seen that in the present invention, in the actual encoding process, the prediction mode of each frame to be encoded obtained in the previous pre-analysis process is directly used. This way of multiplexing the calculation results of the prediction mode of the pre-analysis module makes the actual encoding process The calculation operation of the prediction mode does not need to be performed again, which not only improves the utilization efficiency of calculation resources, but also reduces the calculation amount in the actual encoding process, and improves the encoding efficiency.

It can be understood that, since there is a front-rear correlation between consecutive pixels in a frame of image, the predictive coding method can be used for image prediction. At this time, the output after predictive coding is no longer the original pixel value. It is the difference between the predicted value of the pixel and the actual value. The starting point of the design of predictive coding is that due to the correlation between the front and back, there are a lot of the same or similar phenomena in adjacent pixels. By calculating the difference, a large amount of data volume used to save and transmit the value of the original pixel can be reduced. The predictive coding includes inter-frame prediction and intra-frame prediction. Intra-frame prediction refers to the comparison between pixels in the same frame image, and the final output coding is obtained according to the difference; inter-frame prediction refers to the difference between consecutive different frames. The pixel points are compared, and the final output code is obtained according to the difference value. In addition, intra-frame prediction includes luma and chroma. Although the sizes of luma and chroma are different, the principle of intra-frame prediction is the same. The present invention is directed to intra prediction of luma.

Specifically, the prediction mode in the present invention refers to whether intra-frame prediction or inter-frame prediction should be used for an image frame, and which intra-frame prediction mode is specifically adopted for each macroblock during intra-frame prediction. In the following, 4x4 intra-frame prediction is taken as an example. The intra-frame prediction processes of 8x8 and 16x16 are basically the same and will not be described separately. The implementation principle of intra prediction is as follows:

Referring to FIG. 2 and FIG. 3 , FIG. 3 is a schematic diagram of a 4×4 intra-frame prediction mode.

A frame of image is divided into multiple macroblocks. For 4x4 mode, the luminance component of each macroblock in the frame image is divided into 4x4 luminance points (that is, 16 luminance points), and each macroblock is used as a The basic unit of intra prediction is to perform prediction and coding for each macroblock. Intra prediction refers to the neighboring pixels of each pixel to construct prediction data. For a certain 4×4 macroblock, a total of 13 pixels will be used as reference pixels to build a prediction block (ie macroblock to be predicted). The positional relationship between the prediction block and the reference pixel is shown in Figure 2, which is a schematic diagram of the 4×4 intra-frame prediction brightness block and the prediction direction; in Figure 2, a~p represent the pixels in the prediction block, A/B/C /D indicates the upper reference pixel, E/F/G/H indicates the upper right reference pixel, I/J/K/L indicates the left reference pixel, and Q indicates the upper left reference pixel. For intra-frame prediction of 4×4 luma components, 9 different prediction modes are defined. In addition to the DC mode, the direction descriptions of the other eight modes are shown in Table 1, Figure 2(b) and Figure 3. The direction here refers to: in this mode, the predicted value of the pixel in each prediction block is determined by The values of adjacent pixels in this direction are predicted. In the DC mode, the average value of the upper and left adjacent pixels is used to represent the prediction value of the entire prediction block.

Direction Description of Intra Prediction Mode of Table 1H.264

Preferably, in step s11, the obtained prediction mode of the downsampled frame is stored in the data structure of the frame to be encoded corresponding to the downsampled frame.

It can be understood that each downsampled frame is in one-to-one correspondence with the frame to be encoded, so the prediction modes of the downsampled frame obtained in the pre-analysis process are also in one-to-one correspondence with the frame to be encoded. In order to facilitate calling these prediction modes in the subsequent actual encoding process, in this embodiment, the obtained prediction mode of each downsampled frame is stored in the data structure of the frame to be encoded corresponding to the downsampled frame, so that the subsequent frames to be encoded When performing actual coding, the previously saved prediction mode can be directly obtained from its own data structure for predictive coding, which ensures the accuracy of the prediction mode call and the speed of the prediction mode call. Here, storing in the data structure of the frame to be encoded may refer to storing in a storage location bound to the frame to be encoded, and the present invention does not limit the storage location referred to by the data structure of the frame to be encoded.

In another preferred embodiment, in step s11, the obtained prediction mode of the down-sampled frame and the identification of the frame to be encoded corresponding to the down-sampled frame are correspondingly stored in the prediction mode list.

It can be understood that, in this embodiment, a preset mode list is set, and the identifier of each frame to be encoded is saved in the list, and when the prediction mode of the downsampled frame is obtained by pre-analysis, the prediction mode can be saved to the The position corresponding to the identifier of the frame to be encoded in the list. Alternatively, instead of saving the identifier of the frame to be encoded in the list in advance, the prediction mode and the identifier of the frame to be encoded corresponding to it are uniformly stored in the list when the prediction mode of the downsampled frame is calculated. In this way, the prediction mode can be managed and saved in a unified manner, and it is also convenient to allocate storage space for the preservation of the prediction mode, and it is convenient for subsequent staff to trace the historical prediction mode records.

In addition, when saving the prediction mode, the obtained prediction mode can be cached first, and then saved uniformly after all the prediction modes of the downsampled frames are calculated; or it can be saved immediately every time the prediction mode of a downsampled frame is obtained , and then calculate the prediction mode for the next downsampled frame. Which method is used specifically is not limited in the present invention.

Among them, the main function of the pre-analysis is to calculate the complexity of the downsampled frame, realize the judgment of the frame type, mbtree, etc. Referring to shown in Figure 4, Figure 4 is a schematic diagram of a detailed flow chart of a pre-analysis process; the main principles of its realization are:

Step s21: Downsampling the input original frame to obtain the downsampled frame;

Step s22: divide the downsampled frame into 8x8 blocks, each 8x8 block corresponds to a 16x16 macroblock in the original frame; of course, 4x4 blocks can also be divided here, which is not limited in the present invention.

Step s23: Calculate the cost of the downsampled frame in each mode; if the downsampled frame is an I frame, calculate the cost of each 8x8 block it contains in different intra-frame modes; if the downsampled frame is a P, B frame, Then calculate the cost of each 8x8 block it contains in different intra-frame modes, and perform the motion estimation ME process to calculate the cost of each 8x8 block it contains in different inter-frame modes;

The cost here refers to the distortion cost, that is, in each intra-frame mode, the distortion rate after adopting the predictive coding method; the cost of the downsampled frame in each mode is equal to the sum of the costs of all 8x8 blocks contained in itself, forming The cost of a complete downsampled frame;

Step s24: From the above calculated costs, select the mode with the smallest cost as the prediction type of the original frame corresponding to the subsequent downsampled frame in the actual encoding process.

That is, for example, when calculating the cost of intra-frame prediction, simulate and calculate the distortion rate between the finally calculated predictive encoding and restored image and the actual image under the 9 intra-frame prediction modes respectively. The distortion rate here is the cost, and the distortion The larger the rate is, the greater the cost is, indicating that the effect of this prediction model is worse. Therefore, after the simulation calculation, the model with the smallest cost is selected as the final prediction model obtained from the pre-analysis. Of course, inter prediction is the same process. Moreover, in the above comparison, one is selected from the cost of all calculated inter-frame prediction modes and intra-frame prediction modes. Therefore, the prediction mode selected for the final down-sampled frame may be the intra-frame prediction mode, or it may be The mode of inter prediction. Since the video to be compressed contains multiple frames to be encoded, among the frames to be encoded contained in a video to be compressed, the prediction mode of some frames to be encoded is intra-frame prediction mode, and the prediction mode of some frames to be encoded is inter-frame prediction predictive model. That is, all prediction modes of frames to be coded that are finally obtained may include intra-frame prediction modes and inter-frame prediction modes at the same time, or may all be intra-frame prediction modes, which is not limited in the present invention.

Preferably, the down-sampling frame is divided in an 8×8 block division manner.

It is understandable that if the downsampling frame adopts the 4×4 block division method, it indicates that each 4×4 block corresponds to an 8×8 block in the frame to be encoded, because the 8×8 block cannot cover 16x16 blocks, so if the subsequent frames to be encoded are divided according to 16x16 in actual encoding, the prediction mode in the pre-analysis process cannot be used, that is, in the subsequent actual encoding, only 4×4 or 8×8 division methods can be supported. This results in less limitations. In this embodiment, if the downsampling frame is divided into 8×8 blocks, it indicates that each 8×8 block corresponds to a 16×16 block in the frame to be encoded, that is, in the subsequent actual encoding process, each downsampling The frame prediction mode can be applied to a 16x16 block in a frame to be encoded. Since 16x16 can cover blocks of three sizes: 4x4, 8x8, and 16x16, in the actual encoding process, three blocks of 4x4, 8x8, and 16x16 can be supported at the same time. The division method, that is, the frame to be encoded can be configured as any one of 4x4, 8x8, and 16x16, which facilitates the macroblock division process of the frame to be encoded in the actual encoding process. Of course, the above is only a preferred solution, and the present invention does not limit a specific block division method.

The present invention also provides a video frame coding device, as shown in FIG. 5 , which is a schematic structural diagram of a video frame coding device provided by the present invention. The unit includes:

The pre-analysis module 1 is used to sample the frame to be encoded in the video to be compressed to obtain a down-sampled frame after receiving the pre-analysis instruction, and perform pre-analysis on the down-sampled frame to obtain a prediction mode of the down-sampled frame and save it;

The predictive encoding module 2 is configured to call the prediction mode corresponding to the frame to be encoded from the saved prediction mode to predict the frame to be encoded after receiving the actual encoding instruction;

The subsequent encoding module 3 is configured to perform subsequent encoding operations according to the prediction results after completing the prediction operation of all the frames to be encoded in the video to be compressed to obtain compressed video data of the video to be compressed.

The above modules may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network modules. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The present invention also provides a video frame coding device, the device includes a memory and a processor, the memory stores a video frame coding program that can run on the processor, and when the video frame coding program is executed by the processor, any of the above The video frame encoding method.

The video frame encoding device may include a memory, a processor and a bus.

Wherein, the memory includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory may be an internal storage unit of the video frame encoding device, such as a hard disk of the video frame encoding device. The memory may also be an external storage device of the device in other embodiments, such as a plug-in hard disk equipped on a video frame encoding device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, Flash card (Flash Card), etc. Further, the memory may also include both an internal storage unit of the video frame encoding device and an external storage device. The memory can not only be used to store application software and various data installed in the video frame coding device, such as the code of the video frame coding program, but also can be used to temporarily store the data that has been output or will be output.

In some embodiments, the processor can be a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor or other data processing chips for running program codes stored in the memory or processing data, For example, execute a video frame encoding program, etc.

The bus is used to connect the processor and the memory, and the bus may be a peripheral component interconnect standard (PCI for short) bus or an extended industry standard architecture (EISA for short) bus or the like. The bus can be divided into address bus, data bus, control bus and so on.

Further, the video frame encoding device may also include a network interface, configured to receive input video to be compressed and output compressed video data. The network interface here may optionally include a wired interface and/or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which are generally used to establish a communication connection between the device and other electronic devices.

Optionally, the device may further include a user interface. The user interface may include a display (Display) and an input unit such as a keyboard (Keyboard). Optional user interfaces may also include standard wired interfaces and wireless interfaces. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode, organic light-emitting diode) touch device, and the like. Wherein, the display may also be properly referred to as a display screen or a display unit, and is used for displaying information processed in the video frame encoding device and for displaying a visualized user interface.

In this embodiment, the video frame encoding device may be a PC (Personal Computer, personal computer), and may also be a terminal device such as a smart phone, a tablet computer, a palmtop computer, or a portable computer. Preferably, the device is a node forming a content distribution network CDN network or a blockchain network.

The present invention also provides a computer-readable storage medium, on which a video frame coding program is stored, and the video frame coding program can be executed by one or more processors, so as to realize any of the above video frame encoding method.

If the modules in the video frame encoding device provided above in the present invention are realized in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

The present invention also provides a computer program product, which is characterized in that it includes computer instructions, and when it is run on a computer, the computer can execute the video frame coding method described in any one of the above.

The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions according to the embodiments of the present invention will be generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server, or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be stored by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a Solid State Disk (SSD)).

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described device, device, and computer-readable storage medium can refer to the corresponding process in the foregoing method embodiment, which is not repeated here. repeat.

In the several embodiments provided in this application, it should be understood that the disclosed devices, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or modules, and may be in electrical, mechanical or other forms.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product.

It should also be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or order between the operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (8)

1. A video frame encoding method, applied to an h.264 encoder, comprising:

after receiving a pre-analysis instruction, sampling a frame to be coded in a video to be compressed to obtain a down-sampling frame, pre-analyzing the down-sampling frame to obtain a prediction mode of the down-sampling frame, and storing the prediction mode;

after receiving an actual coding instruction, calling a prediction mode corresponding to the frame to be coded from the stored prediction modes to predict the frame to be coded;

after the prediction operation of all frames to be encoded in the video to be compressed is completed, carrying out subsequent encoding operation according to a prediction result to obtain video compression data of the video to be compressed;

wherein the prediction modes include a plurality of modes of intra prediction and a plurality of modes of inter prediction.

2. The video frame coding method according to claim 1, wherein the obtained prediction mode of the downsampled frame is stored in a data structure of a frame to be coded corresponding to the downsampled frame.

3. The video frame coding method according to claim 1, wherein the obtained prediction mode of the downsampled frame and the identification of the frame to be coded corresponding to the downsampled frame are stored correspondingly in a prediction mode list.

4. The video frame coding method of claim 1, wherein the downsampled frames are partitioned using an 8x8 block partition.

5. A video frame encoding apparatus for use with an h.264 encoder, comprising:

the pre-analysis module is used for sampling a frame to be coded in the video to be compressed to obtain a down-sampling frame after receiving a pre-analysis instruction, pre-analyzing the down-sampling frame to obtain a prediction mode of the down-sampling frame and storing the prediction mode;

the prediction coding module is used for calling a prediction mode corresponding to the frame to be coded from the stored prediction modes to predict the frame to be coded after receiving the actual coding instruction;

the subsequent encoding module is used for performing subsequent encoding operation according to a prediction result after finishing the prediction operation of all frames to be encoded in the video to be compressed, so as to obtain video compression data of the video to be compressed;

wherein the prediction modes include a plurality of modes of intra prediction and a plurality of modes of inter prediction.

6. A video frame encoding device comprising a memory and a processor, the memory having stored thereon a video frame encoding program executable on the processor, the video frame encoding program when executed by the processor implementing the video frame encoding method of any of claims 1-4.

7. The video frame coding device of claim 6, wherein the device is a node that forms a content delivery network, CDN, network or a blockchain network.

8. A computer-readable storage medium having stored thereon a video frame encoding program executable by one or more processors to implement the video frame encoding method of any of claims 1-4.

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