CN116248890A - Video coding method, device, computer equipment and storage medium - Google Patents

Abstract

The invention discloses a video coding method, a video coding device, computer equipment and a storage medium. Acquiring a key frame image, and determining a key frame group matched with the key frame image and a key frame refreshing group; the key frame refreshing group comprises a target number of forward reference frame images; dividing the key frame image into a target number of key frame macro blocks, and encoding each forward reference frame image in the key frame refreshing group according to each key frame macro block; and generating an encoded frame image according to each key frame macro block, and encoding other forward reference frame images except each forward reference frame image in the key frame refreshing group in the key frame group according to the encoded frame image. By using the technical scheme of the invention, the frame data code stream is smoother while the video coding quality is ensured.

Description

A video coding method, device, computer equipment and storage medium

technical field

Embodiments of the present invention relate to the technical field of data transmission and intelligent monitoring, and in particular to a video encoding method, device, computer equipment and storage medium.

Background technique

With the development of smart monitoring technology, people are pursuing a higher quality visual experience, and the clarity of images captured by shooting equipment has also been comprehensively improved.

In the video coding of the traditional IPPP structure, due to the existence of I frames, or IDR (Instantaneous Decoding Refresh, instant decoding refresh) frames, if the data volume of I frames is too large, the network burden will be increased during the transmission of video data, and the The packet loss rate affects the video effect presented by the decoder after decoding. However, reducing the packet loss rate by reducing the amount of I-frame data will result in a decrease in the definition of the I-frame image, increasing the encoding error between the I-frame and the farther P-frame from the I-frame, making the entire video data stream, There are periodic clear to blurred mutations, that is, obvious breathing effects.

Contents of the invention

Embodiments of the present invention provide a video encoding method, device, computer equipment, and storage medium, so as to achieve a smoother frame data stream while ensuring video encoding quality.

In a first aspect, an embodiment of the present invention provides a video encoding method, the method comprising:

Acquiring a key frame image, determining a key frame group and a key frame refresh group matching the key frame image; wherein, the key frame refresh group includes a target number of forward reference frame images;

Divide the key frame image into a target number of key frame macroblocks, and encode each forward reference frame image in the key frame refresh group according to each key frame macroblock;

A coded frame image is generated according to each key frame macroblock, and other forward reference frame images in the key frame group except the forward reference frame images in the key frame refresh group are coded according to the coded frame image.

In a second aspect, an embodiment of the present invention also provides a video encoding device, which includes:

A key frame image acquisition module, configured to acquire a key frame image, and determine a key frame group and a key frame refresh group matching the key frame image; wherein, the key frame refresh group includes a target number of forward reference frame images;

A key frame macroblock encoding module, configured to divide the key frame image into a target number of key frame macroblocks, and encode each forward reference frame image in the key frame refresh group according to each key frame macroblock;

The coded frame image coding module is used to generate coded frame images according to each key frame macroblock, and according to the coded frame images, other forward direction reference frame images in the key frame group except each forward reference frame image in the key frame refresh group The reference frame image is encoded.

In the third aspect, the embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor implements the computer program according to the present invention when executing the program. The video encoding method described in any one of the embodiments.

In the fourth aspect, the embodiment of the present invention also provides a storage medium containing computer-executable instructions, and the computer-executable instructions are used to execute the video as described in any one of the embodiments of the present invention when executed by a computer processor. encoding method.

In the embodiment of the present invention, by determining the key frame group and the key frame refresh group, the key frame image is divided into a target number of key frame macroblocks, and the target number of forward reference frame images in the key frame refresh group are compared by each key frame macroblock. Perform encoding, generate coded frame images according to each key frame macroblock, and code other forward reference frame images in the key frame group except the forward reference frame images in the key frame refresh group according to the coded frame images. In the traditional video coding technology, if the I frame data volume is too large, the problem of increasing the packet loss rate, and reducing the I frame data volume, the problem of obvious breathing effect is easy to occur, and realizes the problem of ensuring the video coding quality. At the same time, it makes the frame data stream smoother.

Description of drawings

FIG. 1 is a flowchart of a video encoding method in Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a video encoding method in Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a video encoding device in Embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram of a computer device in Embodiment 4 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Embodiment one

Fig. 1 is a flow chart of a video encoding method provided by Embodiment 1 of the present invention. This embodiment is applicable to the case where the video encoding party encodes the video data to be transmitted, and the method can be executed by a video encoding device. It can be implemented by software and/or hardware, and is generally integrated in a video encoding device.

As shown in Figure 1, the technical solution of the embodiment of the present invention specifically includes the following steps:

S110. Acquire a key frame image, and determine a key frame group and a key frame refresh group matching the key frame image.

Wherein, the key frame refresh group includes a target number of forward reference frame images.

The key frame image is an I-frame image, that is, an Intra-coded picture (intra-coded image frame). In traditional video coding, an I-frame image is the first frame of a key frame group GOP (Group of Pictures, Group of Pictures), and its function is to compress and encode the key frame group.

In the embodiment of the present invention, the video encoding method is improved by taking the IPPP frame structure as an example. Therefore, the key frame group in this embodiment includes a plurality of forward reference frame images, that is, P frame images, Predictive-coded Picture (forward predictive coded image frame).

The key frame refresh group consists of the target number of P frame images selected in sequence from front to back in the key frame group. For example, if the key frame group contains 200 P frame images and the target number is 5, then the key frame group Select 5 P-frame images from the front to the back as the key frame refresh group.

Optionally, an upper limit and a lower limit of the number of targets may be preset, and the value of the number of targets is determined according to the data amount of the key frame image.

S120. Divide the key frame image into a target number of key frame macroblocks, and encode each forward reference frame image in the key frame refresh group according to each key frame macroblock.

Key frame macroblocks are also I macroblocks, and the number of I macroblocks needs to be consistent with the number of P frame images in the key frame refresh group, so as to encode P frame images through I macroblocks. Similarly, the upper limit and lower limit of the size of the I macroblock can be preset, and the size of the I macroblock can be determined according to the data amount of the I frame image, and the sizes of the I macroblocks can be the same or different.

Correspondingly, the key frame image can be divided into a target number of key frame macroblocks, and the key frame image can also be divided into a target number of key frame macroblocks according to the motion area and the non-motion area. In this embodiment, the key frame macro block The division method is not limited.

When the divided key frame macroblocks are allocated to each forward reference frame image in the key frame refresh group, they can be allocated according to the division order of each key frame macroblock, or can be randomly allocated. When the key frame macroblock is based on motion When dividing an area and a non-moving area, allocation may also be performed according to whether the key frame macroblock includes a moving area, which is not limited in this embodiment.

In the embodiment of the present invention, the I frame image originally inserted into the key frame group is divided, and the divided I macroblock is assigned to the P frame image in the key frame refresh group for encoding, which can avoid the I frame image being too large or too large. Small problems caused by network packet loss or poor video quality reduce bit rate fluctuations and make video bit streams smoother.

S130. Generate coded frame images according to each key frame macroblock, and code other forward reference frame images in the key frame group except the forward reference frame images in the key frame refresh group according to the coded frame images.

Each I macroblock that the key frame refresh group is encoded is filled into a coded frame image, and the next forward reference frame image in the key frame group except each forward reference frame image in the key frame refresh group is generated by generating The coded frame image is inter-frame reference coded.

In the embodiment of the present invention, in order to ensure the accuracy of decoding, the filling order of each I macroblock in the coded frame image needs to be maintained with the order in which each I macroblock is assigned to the P frame image in the key frame refresh group for encoding unanimous.

Subsequent forward reference frame images can be encoded using the existing encoding method until all forward reference frame images of this key frame group are encoded. Exemplarily, an MCP (Motion Compensation Prediction, motion compensation prediction) algorithm may be used to encode subsequent forward reference frame images, but this embodiment does not limit the specific encoding manner.

In the technical solution of this embodiment, by determining the key frame group and the key frame refresh group, the key frame image is divided into a target number of key frame macroblocks, and each key frame macroblock forwards the target number of key frame refresh groups. The reference frame image is encoded, the encoded frame image is generated according to each key frame macroblock, and the other forward reference frame images in the key frame group except the forward reference frame image in the key frame refresh group are encoded according to the encoded frame image. In the traditional video coding technology, if the I frame data volume is too large, the problem of increasing the packet loss rate, and reducing the I frame data volume, the problem of obvious breathing effect is easy to occur, and realizes the problem of ensuring the video coding quality. At the same time, it makes the frame data stream smoother.

Embodiment two

Fig. 2 is a flow chart of a video encoding method provided by Embodiment 2 of the present invention. On the basis of the above-mentioned embodiments, the embodiment of the present invention divides key frame macroblocks and refreshes each forward direction in the key frame group. The process of encoding the reference frame image, the process of generating the encoded frame image according to each key frame macroblock, and the process of encoding other forward reference frame images in the key frame group are further specified, and the generation of custom information, and the steps to insert a starting keyframe image flow.

Correspondingly, as shown in Figure 2, the technical solution of the embodiment of the present invention specifically includes the following steps:

S210. Acquire a key frame image, and determine a key frame group and a key frame refresh group matching the key frame image.

In the embodiment of the present invention, the length of the key frame refresh group is determined according to the data amount of the key frame image, that is, the number of forward reference frame images in the key frame refresh group. The length of the key frame refresh group can be written into the custom information, which is SEI (Supplemental Enhancement Information, Supplemental Enhancement Information) information, which provides a method of adding additional information to the video code stream. The custom information is carried by the video code stream and sent to the video decoder for decoding by the video decoder.

S220. Determine a motion area in the key frame image, and divide the key frame image into a preset number of key frame macroblocks according to the motion area and a preset macroblock size interval.

Wherein, the moving area is an area containing moving objects, and the macroblock size range is used to determine the upper limit and lower limit of the macroblock size. Optionally, the motion area in the key frame image may be detected according to the target detection algorithm, but this embodiment does not limit the manner of determining the motion area in the key frame image. After dividing the moving area and the non-moving area in the key frame image, the key frame macroblocks can be divided according to the size range of the macroblocks.

Exemplarily, if the preset number is 4, the moving object detection is performed on the key frame image to obtain two moving regions A and B, then the other regions in the key frame image except A and B are equally divided into two parts, Obtain non-motion regions C and D. If the sizes of A, B, C and D are all within the macroblock size interval, then A, B, C and D are directly determined as four key frame macroblocks. If the size of the motion area A is smaller than the lower limit value of the macroblock size, and the sizes of the motion area B and the non-motion areas C and D are all within the macroblock size range, then it can be divided into the motion area A in the area of C and/or D Part of the area connected to the motion area A, so that the sizes of the divided motion area A, non-motion area C and D can all be within the macroblock size range. In this embodiment, there is no limitation on the method of dividing the key frame image into key frame macroblocks according to the motion area, macroblock size interval and preset number.

S230. Sort each key frame macroblock according to whether each key frame macroblock includes a motion area and the position of each key frame macroblock.

In the embodiment of the present invention, after the key frame macroblocks are divided into the macroblocks containing the motion area and the macroblocks not containing the motion area, the key frame macroblocks can be further sorted by using the attention model. The essence of the attention model is to locate the information of interest and suppress useless information. Specifically, in this embodiment of the present invention, the central position of the key frame image can be used as the region of interest to diffuse to the surroundings through the Gaussian model. Therefore, the order of each key frame can be divided into a central motion area, a surrounding motion area, a central non-motion area and a surrounding non-motion area.

In the embodiment of the present invention, each key frame macroblock is divided into motion areas and positions, and sorted sequentially, the purpose of which is to encode each forward reference frame image sequentially according to the order of each key frame macroblock, so that It can reduce the coding error and make the coded stream smoother.

S240. According to the sequence of each key frame macroblock, sequentially allocate each key frame macroblock to each forward reference frame image in the key frame refresh group for encoding.

Since the number of key frame macroblocks is consistent with the number of forward reference frame images in the key frame refresh group, after sorting each key frame macroblock, each key frame macroblock can be sequentially sorted according to the order of each key frame macroblock The key frame macroblocks are assigned to each forward reference frame image in the key frame refresh group for encoding.

S250. According to the order of the macroblocks of the key frames, splice the macroblocks of the key frames to generate a coded frame image.

In the embodiment of the present invention, after the encoding of each forward reference frame image is completed in sequence, each key frame macroblock is spliced into an encoded frame image according to the order of each key frame macroblock.

Optionally, a cache of coded frame images can also be generated, and each time the coding of the forward reference frame image according to the key frame macroblock is completed, the key frame macroblock is filled into the coded frame image until each previous reference frame image in the key frame refresh group The encoding to the reference frame image is completed, and the encoded frame image is completely filled. This embodiment does not limit the manner of generating the coded frame image.

S260. According to the encoded frame image, encode the first forward reference frame image in the key frame group except the forward reference frame images in the key frame refresh group.

For the other forward reference frame images in the key frame group except the key frame refresh group, encode the first forward reference frame image according to the coded frame images generated above.

S270. Encode each forward reference frame image following the first forward reference frame image in a forward prediction manner.

For other forward reference frame images after the first forward reference frame image, the existing forward prediction method is used to encode until all the forward reference frame images in the key frame group are encoded.

S280. Generate custom information according to the order of each key frame macroblock in the coded frame image.

In the embodiment of the present invention, after encoding of all forward reference frame images is completed, the order of each key frame macroblock is semantically encoded and then written into the self-defined information as an example.

Optionally, each time the encoding of the forward reference frame image according to the key frame macroblock is completed, and the key frame macroblock is filled into the encoded frame image, the sequence of the key frame macroblock in the encoded frame image It is added to the custom information, which is not limited in this embodiment.

S290. Send the custom information and the encoded video to a decoder, so that the decoder decodes the encoded video according to the custom information.

Correspondingly, S290 can include:

S291. Determine the first key frame group in the video.

In the embodiment of the present invention, each frame image of the video is divided into the first forward reference frame image and a plurality of key frame groups. Frame image, key frame encoding is performed, that is, the first forward reference frame in each frame image of the video is encoded by IDR, so as to realize the streaming of the video.

S292. Perform key frame encoding on the first forward reference frame image before the first key frame group, so as to realize video streaming.

The streaming mode in the embodiment of the present invention can ensure that the video streaming is normal without delay.

S293. Send the custom information along with the video stream to the decoder.

Optionally, at the video decoding side, when receiving the video code stream, if there is a packet loss in the key frame group, the error concealment algorithm can be used to restore and reconstruct the encoded frame, so that the decoding can be performed normally, which improves the video decoding side's resistance. Packet loss capability.

Among them, the principle of the error concealment algorithm is that when a certain forward reference frame image in the video code stream is lost, the macroblock of the previous forward reference frame image of the forward reference frame image can be directly copied to reconstruct the coded frame to realize the error hide.

In the technical solution of this embodiment, by determining the key frame group and the key frame refresh group, the key frame image is divided into a target number of key frame macroblocks according to the motion area, whether each key frame macro block contains a motion area, and each key frame The position of the macroblocks, the key frame macroblocks are sorted, and each key frame macroblock is assigned to the target number of forward reference frame images in the key frame refresh group according to the order, and the key frame macroblocks are encoded according to the sequence of each key frame macroblock , splicing to generate coded frame images, encode the first forward reference frame image in the key frame group except the forward reference frame image in the key frame refresh group according to the coded frame image, and then encode the other forward reference frame images Encoded by forward encoding. In the traditional video coding technology, if the I frame data volume is too large, the problem of increasing the packet loss rate, and reducing the I frame data volume, the problem of obvious breathing effect is easy to occur, and realizes the problem of ensuring the video coding quality. At the same time, it makes the frame data stream smoother.

Embodiment Three

Fig. 3 is a schematic structural diagram of a video encoding device provided in Embodiment 3 of the present invention. The device is deployed in a video encoding device, and the device includes: a key frame image acquisition module 310, a key frame macroblock encoding module 320, and an encoded frame image encoding module 330 . in:

A key frame image acquisition module 310, configured to acquire a key frame image, and determine a key frame group and a key frame refresh group matching the key frame image; wherein, the key frame refresh group includes a target number of forward reference frame images ;

A key frame macroblock encoding module 320, configured to divide the key frame image into a target number of key frame macroblocks, and encode each forward reference frame image in the key frame refresh group according to each key frame macroblock;

The coded frame image encoding module 330 is configured to generate a coded frame image according to each key frame macroblock, and, according to the coded frame image, perform an operation on other previous reference frame images in the key frame group except for each forward reference frame image in the key frame refresh group Coding to the reference frame image.

In the technical solution of this embodiment, by determining the key frame group and the key frame refresh group, the key frame image is divided into a target number of key frame macroblocks, and each key frame macroblock forwards the target number of key frame refresh groups. The reference frame image is encoded, the encoded frame image is generated according to each key frame macroblock, and the other forward reference frame images in the key frame group except the forward reference frame image in the key frame refresh group are encoded according to the encoded frame image. In the traditional video coding technology, if the I frame data volume is too large, the problem of increasing the packet loss rate, and reducing the I frame data volume, the problem of obvious breathing effect is easy to occur, and realizes the problem of ensuring the video coding quality. At the same time, it makes the frame data stream smoother.

On the basis of the foregoing embodiments, the key frame macroblock encoding module 320 includes:

The key frame image division unit is configured to determine the motion area in the key frame image, and divide the key frame image into a preset number of key frame macroblocks according to the motion area and a preset macroblock size interval.

On the basis of the foregoing embodiments, the key frame macroblock encoding module 320 includes:

The key frame macro block sorting unit is used to sort each key frame macro block according to whether each key frame macro block contains a motion area, and the position of each key frame macro block;

The key frame macroblock encoding unit is configured to sequentially allocate each key frame macroblock to each forward reference frame image in the key frame refresh group according to the order of each key frame macroblock for encoding.

On the basis of the foregoing embodiments, the encoding frame image encoding module 330 includes:

The key frame macroblock splicing unit is used for splicing each key frame macroblock according to the order of each key frame macroblock to generate a coded frame image.

On the basis of the foregoing embodiments, the encoding frame image encoding module 330 includes:

The first encoding unit is configured to encode the first forward reference frame image in the key frame group except the forward reference frame images in the key frame refresh group according to the encoded frame image;

The second encoding unit is configured to encode each forward reference frame image following the first forward reference frame image by means of forward prediction.

On the basis of the foregoing embodiments, the device further includes:

A custom information generation module, configured to generate custom information according to the order of each key frame macroblock in the coded frame image;

A data sending module, configured to send the custom information and the coded video to a decoder, so that the decoder decodes the coded video according to the custom information.

On the basis of the foregoing embodiments, the data sending module is specifically used for:

Determine the first keyframe group in the video;

Key frame encoding is performed on the first forward reference frame image before the first key frame group to realize video streaming;

Send the custom information along with the video stream to the decoder.

The video encoding device provided in the embodiment of the present invention can execute the video encoding method provided in any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method.

Embodiment Four

FIG. 4 is a schematic structural diagram of a computer device provided in Embodiment 4 of the present invention. As shown in FIG. 4 , the computer device includes a processor 70, a memory 71, an input device 72, and an output device 73; The quantity can be one or more, and a processor 70 is taken as an example in Fig. 4; the processor 70, the memory 71, the input device 72 and the output device 73 in the computer equipment can be connected by bus or other ways, and in Fig. 4 by Take the bus connection as an example.

The memory 71, as a computer-readable storage medium, can be used to store software programs, computer-executable programs and modules, such as the modules corresponding to the video encoding method in the embodiment of the present invention (for example, the key frame image acquisition module in the video encoding device 310, key frame macroblock coding module 320 and coded frame image coding module 330). The processor 70 executes various functional applications and data processing of the computer device by running the software programs, instructions and modules stored in the memory 71 , that is, realizes the above-mentioned video encoding method. The method includes:

Acquiring a key frame image, determining a key frame group and a key frame refresh group matching the key frame image; wherein, the key frame refresh group includes a target number of forward reference frame images;

Divide the key frame image into a target number of key frame macroblocks, and encode each forward reference frame image in the key frame refresh group according to each key frame macroblock;

A coded frame image is generated according to each key frame macroblock, and other forward reference frame images in the key frame group except the forward reference frame images in the key frame refresh group are coded according to the coded frame image.

The memory 71 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required by a function; the data storage area may store data created according to the use of the terminal, and the like. In addition, the memory 71 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage devices. In some examples, the memory 71 may further include memory located remotely relative to the processor 70, and these remote memories may be connected to the computer device through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 72 can be used to receive input numbers or character information, and generate key signal input related to user settings and function control of the computer equipment. The output device 73 may include a display device such as a display screen.

Embodiment five

Embodiment 5 of the present invention also provides a storage medium containing computer-executable instructions, the computer-executable instructions are used to execute a video encoding method when executed by a computer processor, and the method includes:

Acquiring a key frame image, determining a key frame group and a key frame refresh group matching the key frame image; wherein, the key frame refresh group includes a target number of forward reference frame images;

Divide the key frame image into a target number of key frame macroblocks, and encode each forward reference frame image in the key frame refresh group according to each key frame macroblock;

A coded frame image is generated according to each key frame macroblock, and other forward reference frame images in the key frame group except the forward reference frame images in the key frame refresh group are coded according to the coded frame image.

Certainly, a storage medium containing computer-executable instructions provided in an embodiment of the present invention, the computer-executable instructions are not limited to the method operations described above, and may also perform the video encoding method provided in any embodiment of the present invention. related operations.

Through the above description about the implementation mode, those skilled in the art can clearly understand that the present invention can be realized by means of software and necessary general-purpose hardware, and of course it can also be realized by hardware, but in many cases the former is a better implementation mode . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a floppy disk of a computer , read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disc, etc., including several instructions to make a computer device (which can be a personal computer, A server, or a network device, etc.) executes the methods described in various embodiments of the present invention.

It is worth noting that, in the embodiment of the video encoding device above, the units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, each The specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the present invention.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. A video encoding method, comprising:

acquiring a key frame image, and determining a key frame group matched with the key frame image and a key frame refreshing group; the key frame refreshing group comprises a target number of forward reference frame images;

dividing the key frame image into a target number of key frame macro blocks, and encoding each forward reference frame image in the key frame refreshing group according to each key frame macro block;

and generating an encoded frame image according to each key frame macro block, and encoding other forward reference frame images except each forward reference frame image in the key frame refreshing group in the key frame group according to the encoded frame image.

2. The method of claim 1, wherein dividing the key frame image into a target number of key frame macro-blocks comprises:

and determining a motion area in the key frame image, and dividing the key frame image into a preset number of key frame macro blocks according to the motion area and a preset macro block size interval.

3. The method of claim 2, wherein encoding each forward reference frame image in the keyframe refresh set from each keyframe macroblock comprises:

sequencing each key frame macro block according to whether each key frame macro block contains a motion area and the position of each key frame macro block;

and sequentially distributing each key frame macro block to each forward reference frame image in the key frame refreshing group for encoding according to the sequence of each key frame macro block.

4. A method according to claim 3, wherein generating an encoded frame image from each key frame macroblock comprises:

and splicing the key frame macro blocks according to the sequence of the key frame macro blocks to generate an encoded frame image.

5. The method of claim 1, wherein encoding, from the encoded frame image, other forward reference frame images in the key frame group than each forward reference frame image in the key frame refresh group, comprises:

encoding a first forward reference frame image in the key frame group except for each forward reference frame image in the key frame refreshing group according to the encoded frame image;

and encoding each forward reference frame image after the first forward reference frame image in a forward prediction mode.

6. The method according to any one of claims 1-5, further comprising, after encoding the other forward reference frame pictures in the key frame group than the forward reference frame pictures in the key frame refresh group:

generating custom information according to the sequence of each key frame macro block in the coded frame image;

and transmitting the custom information and the encoded video to a decoding party so that the decoding party decodes the encoded video according to the custom information.

7. The method of claim 6, wherein transmitting the custom information and the encoded video to a decoder comprises:

determining a first key frame group in the video;

performing key frame coding on a first forward reference frame image before a first key frame group so as to realize the streaming of the video;

and sending the custom information to a decoder along with the video stream.

8. A video encoding apparatus, comprising:

the key frame image acquisition module is used for acquiring a key frame image and determining a key frame group matched with the key frame image and a key frame refreshing group; the key frame refreshing group comprises a target number of forward reference frame images;

the key frame macro block coding module is used for dividing the key frame image into a target number of key frame macro blocks, and coding each forward reference frame image in the key frame refreshing group according to each key frame macro block;

and the encoding frame image encoding module is used for generating encoding frame images according to each key frame macro block, and encoding other forward reference frame images except each forward reference frame image in the key frame refreshing group in the key frame group according to the encoding frame images.

9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the video encoding method of any of claims 1-7 when the program is executed by the processor.

10. A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing the video encoding method of any of claims 1-7.

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