CN107659819B - A kind of method and apparatus of video code conversion - Google Patents

Abstract

The invention discloses a video transcoding method and device, belonging to the technical field of computers. The method includes: obtaining the video data packet of the decapsulated target video; periodically calculating the global average bit rate of the target video and the local average bit rate in a preset period; according to the global average bit rate and the The local average bit rate is used to adjust the encoding bit rate; based on the adjusted encoding bit rate, the target video is transcoded. By adopting the present invention, the code rate of the output video is basically consistent with that of the input video to the greatest extent, thereby improving the effect of video transcoding.

Description

Method and device for video transcoding

technical field

The present invention relates to the field of computer technology, in particular to a video transcoding method and device.

Background technique

With the development of Internet technology and the continuous increase of modern bandwidth, the connection between the Internet and people's lives is becoming closer and closer. More and more people are keen to obtain videos on the Internet to enrich their lives. At present, high-quality and high-quality videos have become The first choice for people's daily needs.

Based on the needs of publicity or copyright protection, video publishers often add exclusive watermarks to the published video data to prevent the video data from being stolen by others. Specifically, the publisher can first obtain the packaged initial video (which can be called the input video), then decapsulate and decode the video data of the initial video, and then add a watermark to each frame of the video, and then publish The party can encode and encapsulate the watermarked video data, so as to provide the final video (which may be called the output video) to the receiver (such as the relay party or the audience, etc.). The above process of processing video data may also be referred to as transcoding processing of video data.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

If the code rate of the transcoded video is too small, the image quality of the video will be poor, and even picture distortion or mosaic phenomenon will appear, and if the code rate of the video after transcoding is too high, it will lead to the loss of bandwidth resources when transmitting the video. Waste, in this way, the bit rate of the output video needs to be as close as possible to the bit rate of the input video. However, due to the influence of different encoding modes, it is difficult to accurately know the bit rate of the input video during transcoding, so the effect of video transcoding is poor.

Contents of the invention

In order to solve the problems in the prior art, embodiments of the present invention provide a video transcoding method and device. Described technical scheme is as follows:

In a first aspect, a video transcoding method is provided, the method comprising:

Obtain the video data packet of the target video after decapsulation;

Periodically calculate the global average bit rate of the target video and the local average bit rate within a preset period;

adjusting the coding rate according to the global average rate and the local average rate;

Based on the adjusted coding rate, the target video is transcoded.

Optionally, the periodic calculation of the global average bit rate of the target video and the local average bit rate within a preset period includes:

accumulating the data volume of the video data packet into the acquired global data volume of the target video and the local data volume of the target video acquired within a preset period;

Determine the decoded duration and preset period duration of the target video according to the decoding timestamp corresponding to the video data packet;

The quotient of the global data amount and the decoded duration is taken as the global average code rate, and the quotient of the local data amount and the preset cycle duration is taken as the local average code rate.

Optionally, adjusting the encoding bit rate according to the global average bit rate and the local average bit rate includes:

If the absolute difference between the local average bit rate and the current encoding bit rate is greater than a preset threshold, then determine whether the local average bit rate is greater than a preset minimum bit rate reference value;

If yes, set the encoding bit rate as the local average bit rate; if not, set the maximum value of the global average bit rate and the minimum bit rate reference value as the encoding bit rate.

Optionally, if the absolute difference between the local average code rate and the current encoding code rate is greater than a preset threshold, then judging whether the local average code rate is greater than a preset minimum code rate reference value includes:

If the absolute difference between the local average bit rate and the current encoding bit rate is greater than a preset threshold, and the decoded duration is longer than a preset time length, it is judged whether the local average bit rate is greater than a preset minimum bit rate reference value.

Optionally, the method also includes:

If the absolute difference between the local average code rate and the current encoding code rate is greater than the preset threshold, and the decoded duration is less than the preset duration, then the maximum of the local average code rate and the preset maximum code rate reference value value as the code rate.

Optionally, the method also includes:

The attribute information of the target video is acquired, and the attribute information includes at least a target resolution and a target frame rate of the target video.

Optionally, the method also includes:

determining the mathematical relationship between the attribute information of the target video and the preset standard attribute information;

Determine a minimum code rate reference value and a maximum code rate reference value of the target video according to the mathematical relationship and the standard code rate corresponding to the standard attribute information.

In a second aspect, a device for video transcoding is provided, the device comprising:

The first obtaining module is used to obtain the video data packet of the decapsulated target video;

A calculation module, configured to periodically calculate the global average bit rate of the target video and the local average bit rate within a preset period;

An adjustment module, configured to adjust the encoding bit rate according to the global average bit rate and the local average bit rate;

The transcoding module is configured to perform transcoding processing on the target video based on the adjusted coding rate.

Optionally, the calculation module is specifically used for:

accumulating the data volume of the video data packet into the acquired global data volume of the target video and the local data volume of the target video acquired within a preset period;

Determine the decoded duration and preset period duration of the target video according to the decoding timestamp corresponding to the video data packet;

The quotient of the global data amount and the decoded duration is taken as the global average code rate, and the quotient of the local data amount and the preset cycle duration is taken as the local average code rate.

Optionally, the adjustment module is specifically used for:

If the absolute difference between the local average bit rate and the current encoding bit rate is greater than a preset threshold, then determine whether the local average bit rate is greater than a preset minimum bit rate reference value;

If yes, set the encoding bit rate as the local average bit rate; if not, set the maximum value of the global average bit rate and the minimum bit rate reference value as the encoding bit rate.

Optionally, the adjustment module is specifically used for:

If the absolute difference between the local average bit rate and the current encoding bit rate is greater than a preset threshold, and the decoded duration is longer than a preset time length, it is judged whether the local average bit rate is greater than a preset minimum bit rate reference value.

Optionally, the adjustment module is also used for:

If the absolute difference between the local average code rate and the current encoding code rate is greater than the preset threshold, and the decoded duration is less than the preset duration, then the maximum of the local average code rate and the preset maximum code rate reference value value as the code rate.

Optionally, the device also includes:

The second obtaining module is configured to obtain attribute information of the target video, where the attribute information at least includes a target resolution and a target frame rate of the target video.

Optionally, the device also includes:

The first determining module is configured to determine the mathematical relationship between the attribute information of the target video and preset standard attribute information.

Optionally, the device also includes:

The second determination module is configured to determine a minimum code rate reference value and a maximum code rate reference value of the target video according to the mathematical relationship and the standard code rate corresponding to the standard attribute information.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

In the embodiment of the present invention, the server obtains the video data packet of the target video after decapsulation, periodically calculates the global average bit rate of the target video and the local average bit rate in the preset period, according to the global average bit rate and the local average bit rate , adjust the encoding bit rate, and perform transcoding processing on the target video based on the adjusted encoding bit rate. In this way, during the process of transcoding the target video, the server can detect the encoding bit rate in real time, and adjust the encoding bit rate in time according to the detection results, so as to ensure that the bit rate of the output video is basically the same as the bit rate of the input video. Consistent, so that the effect of video transcoding can be improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a flowchart of a video transcoding method provided by an embodiment of the present invention;

Fig. 2 is a schematic flow chart of adjusting the coding rate provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of video transcoding steps provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a video transcoding device provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a video transcoding device provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a server provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

An embodiment of the present invention provides a method for video transcoding, and the execution subject of the method may be a server. Wherein, the server may be a server with a video transcoding function, such as a server of a video publisher. After receiving video data, the server may perform transcoding processing on the video, and then provide the transcoded video to the outside world. The above-mentioned server may include a processor, a memory, and a transceiver. The processor may be used to perform video transcoding processing in the following process, and the memory may be used to store data required and generated during the following processing. The transceiver may use Used to receive and send relevant data in the following processes, such as for receiving input video and sending output video. In this embodiment, the server is the management server of the live broadcast platform as an example for illustration, other situations are similar and will not be introduced one by one.

The processing flow shown in FIG. 1 will be described in detail below in conjunction with specific implementation methods, and the content may be as follows:

Step 101, acquire the video data packet of the decapsulated target video.

In the implementation, after the anchor starts live broadcasting in the live broadcast room, the data acquisition equipment on the anchor side can collect in real time the pictures and sounds used to generate the live video, and then the video production equipment will generate the corresponding live video, and the video transmission equipment will The live video is sent to the server of the live broadcast platform in real time. In this way, the server can receive the video data of the live video sent by the host side. Before the server forwards the live video to the viewers in the live room, the server may perform video transcoding on the live video to add a watermark to the video screen. Specifically, the server can first obtain information such as the encapsulation format, audio and video parameters, and codec parameters of the live video (that is, the target video), and then decapsulate the above target video according to the encapsulation format, so that the decapsulated target video can be obtained. The video data of the video. Here, the video data of the target video will be acquired in the form of video data packets, and each video data packet corresponds to an image frame in the video. Certainly, what is disclosed in this embodiment is a video transcoding method, which is not only suitable for adding watermarks to video images, but also can be used for other reasonable and feasible processes.

Step 102, periodically calculate the global average bit rate of the target video and the local average bit rate within a preset period.

In implementation, when the server obtains the video data packets of the target video, it may periodically calculate the global average bit rate Rg of the target video and the local average bit rate Rt within a preset period. Specifically, at the end of each cycle, it is possible to count all the data volumes of the acquired target video (may be called the global data volume), and the time elapsed from the beginning of decoding to the present (may be called the decoded time length), and then The quotient of the global data amount and the decoded duration can be taken as the global average code rate Rg. At the same time, it is also possible to count all the data volume of the target video that has been acquired within the preset period (which can be called the local data volume), and then use the quotient of the local data volume and the duration of the preset period as the local average bit rate within the preset period Rt.

Optionally, when calculating the global average code rate and the local average code rate, the currently acquired video data packet can be considered at the same time. Correspondingly, the processing of step 102 can be as follows: accumulate the data volume of the video data packet to the acquired target The global data volume of the video and the local data volume of the target video acquired within the preset period; according to the decoding timestamp corresponding to the video data packet, determine the decoded duration of the target video and the preset period duration; combine the global data volume and The quotient of the decoded time length is used as the global average code rate, and the quotient of the local data volume and the preset cycle time is used as the local average code rate.

In implementation, after the server obtains a certain video data packet of the target video, the data amount of the video data packet can be accumulated to the global data amount of the obtained target video and the total data amount of the target video obtained within a preset period. in the local data volume. At the same time, the server can also obtain the decoding timestamp corresponding to the video data packet, and then determine the decoded duration and preset cycle duration of the target video based on the decoding timestamp, for example, convert the decoding timestamp corresponding to the video data packet to local time is t1, the decoding timestamp corresponding to the last video data packet is converted to the local time as t2, it is known that the time elapsed from the beginning of decoding to the present is T1, and the preset cycle time is T2. When t1-t2 is less than T2, no processing is performed. Waiting for the reception of the next video data packet, when t1-t2 is greater than T2, calculate the average code rate in the current cycle. Afterwards, the server may use the quotient of the calculated global data amount and the decoded duration as the global average code rate Rg, and use the quotient of the local data amount and the preset cycle time as the local average code rate Rt. The preset cycle duration in this embodiment is not necessarily a fixed value, and may be determined according to actual usage conditions and requirements.

Step 103, adjusting the encoding bit rate according to the global average bit rate and the local average bit rate.

In implementation, after the server calculates the global average bit rate Rg of the target video and the local average bit rate Rt within the preset period, the currently used encoding bit rate can be calculated according to the global average bit rate Rg and the local average bit rate Rt. R to adjust. For example, the local average bit rate Rt can be compared with the currently used encoding bit rate, and if the absolute difference between the two exceeds a preset threshold, the encoding bit rate can be adjusted to the value of the above-mentioned global average bit rate Rg. If the absolute difference between the two does not exceed the preset threshold, the current encoding rate remains unchanged. Certainly, there are various schemes for adjusting the coding bit rate, and a simple and feasible scheme is only given here as an example. It is worth mentioning that, for the two different encoding modes of ABR (available bit-rate, available bit rate) and VBR (Variable Bit Rate, dynamic bit rate), the set encoding bit rate can be the maximum code in VBR encoding mode rate, or the average bit rate in ABR encoding mode.

Optionally, in order to avoid that in the VBR encoding mode, the code rate in a certain period of time is too small due to the stillness of the video picture or the simple scene, a corresponding code rate reference value can be set. Correspondingly, the processing of step 103 can be as follows: If the absolute difference between the local average bit rate and the current encoding bit rate is greater than the preset threshold, then judge whether the local average bit rate is greater than the preset minimum bit rate reference value; if so, set the encoding bit rate as the local average bit rate , if not, use the maximum value among the global average bit rate and the minimum bit rate reference value as the encoding bit rate.

Wherein, the preset threshold may be a standard value preset by technicians for judging whether the bit rate fluctuates too much during the video transcoding process and whether the encoding bit rate needs to be updated.

In implementation, for the target video, a minimum bit rate reference value of the video may be preset at the server, that is, in any case, the encoding bit rate of the target video is not less than the minimum bit rate reference value. In this way, after the server calculates the global average bit rate Rg of the target video and the local average bit rate Rt within the preset period, it can compare the local average bit rate Rt with the current encoding bit rate, if the absolute difference between the two is greater than If the threshold is preset, the local average bit rate Rt and the preset minimum bit rate reference value can be judged. If the local average code rate Rt is greater than the above minimum code rate reference value, you can directly set the encoding code rate as the local average code rate Rt; and if the local average code rate Rt is not greater than the above minimum code rate reference value, you can choose the global The maximum value of the average bit rate Rg and the minimum bit rate reference value is used as the encoding bit rate. Of course, if the absolute difference between the local average code rate Rt and the current code rate does not exceed the preset threshold, the current code rate remains unchanged.

Optionally, due to the characteristics of the average value, the more data there is, the closer the average value is to the real value. In the initial stage of transcoding, the calculated global average bit rate of the input video stream has no reference value due to the small amount of data. To avoid this situation, the following processing can be done: If the absolute difference between the local average code rate and the current encoding code rate is greater than the preset threshold, and the decoded time is longer than the preset time, then judge whether the local average code rate is greater than the preset minimum code rate reference value; if the absolute difference between the local average bit rate and the current encoding bit rate is greater than the preset threshold, and the decoded duration is less than the preset duration, the maximum of the local average bit rate and the preset maximum bit rate reference value will be The value is used as the encoding bit rate.

In implementation, similar to the minimum bit rate reference value, for the target video, the server can also preset the maximum bit rate reference value of the video, that is, in any case, the encoding bit rate of the target video is not greater than the minimum bit rate Rate reference value. In this way, after the server calculates the global average bit rate Rg of the target video and the local average bit rate Rt within the preset period, it can compare the local average bit rate Rt with the current encoding bit rate, if the absolute difference between the two is greater than If the threshold is preset, and the decoded duration is longer than the preset duration, the local average code rate Rt and the preset minimum code rate reference value can be judged, and the coded code rate can be adjusted according to the judgment result. Specifically, it can be Refer to step 103. And if the absolute difference between the local average bit rate Rt and the current encoding bit rate is greater than the preset threshold, but the decoded duration is less than the preset duration, then the maximum of the local average bit rate Rt and the preset maximum bit rate reference value can be The value is used as the encoding bit rate. It is worth mentioning that, in order to avoid poor video quality after transcoding, you can initialize the encoding bit rate value to the above-mentioned maximum bit rate reference value at the initial stage of transcoding.

Optionally, the calculation standards for the minimum bit rate reference value and the maximum bit rate reference value are various, and can be specifically calculated according to the attribute information of the target video, and the corresponding processing can be as follows: obtain the attribute information of the target video; determine the target video The mathematical relationship between the attribute information and the preset standard attribute information; according to the mathematical relationship and the standard bit rate corresponding to the standard attribute information, determine the minimum bit rate reference value and the maximum bit rate reference value of the target video.

Wherein, the attribute information includes at least a target resolution and a target frame rate of the target video.

In an implementation, the server may set a corresponding relationship between standard attribute information of the video and a standard bit rate, and the corresponding relationship may be obtained based on historical data or empirical statistics. In this way, when calculating the minimum bit rate reference value and the maximum bit rate reference value of the target video, the attribute information of the target video can be obtained first, which at least includes the target resolution and target frame rate of the target video, and then according to the preset The algorithm determines the mathematical relationship between the attribute information of the target video and the preset standard attribute information. The preset algorithms here can be various, and can be selected by technicians according to the rationality of the data, and this embodiment does not limit the specific algorithms. For example, the target resolution is weight1*height1, the target frame rate is fps1, the standard resolution in the standard attribute information is weight0*height0, the standard frame rate is fps0, the mathematical relationship can be: f(s)=(weight1*height1 *fps1)/(weight0*height0*fps0), or the mathematical relationship can also be: g(s)=log(weight1*height1*fps1)/log(weight0*height0*fps0). Afterwards, the minimum bit rate reference value and the maximum bit rate reference value of the target video may be determined according to the above mathematical relationship and the standard bit rate corresponding to the standard attribute information. Specifically, when the standard code rate is R0, there may be R1=R0*f(s), R2=R0*g(s), and then the maximum code rate reference value is Rmax=MAX(R1, R2); the minimum The code rate reference value is Rmin=MIN(R1, R2).

For the entire process of adjusting the coding rate described above, reference may be made to FIG. 2 .

Step 104, based on the adjusted coding rate, perform transcoding processing on the target video.

In implementation, after the server adjusts the encoding bit rate based on the above-mentioned global average bit rate Rg and local average bit rate Rt, the target video can be transcoded based on the adjusted encoding bit rate, that is, decoding, filtering Steps such as mirror processing (including the processing of adding watermark), re-encoding and output, until the next time the encoding rate is adjusted.

For ease of understanding, Figure 3 shows the overall process of video transcoding, and the specific content can be as follows: 1. The server reads the target video; 2. Obtains information such as the target video package format, video parameters, and codec parameters; 3. Transcodes the target video Video decapsulation, separate its audio and video data; 4.1, for video data, adjust the encoding bit rate, and set the encoding bit rate to the parameters of the encoder; 4.2, decode the video data of the target video; 4.3, the image of the video data Frame filter processing; 4.4, encoding the video data processed by the filter; 5.1, for audio data, decoding the audio data; 5.2, performing filter processing on the audio data of the target video; 5.3, encoding the audio data processed by the filter ; 6. Encapsulate the target video according to the output file type; 7. Output the target video.

In the embodiment of the present invention, the server obtains the video data packet of the target video after decapsulation, periodically calculates the global average bit rate of the target video and the local average bit rate in the preset period, according to the global average bit rate and the local average bit rate , adjust the encoding bit rate, and perform transcoding processing on the target video based on the adjusted encoding bit rate. In this way, during the process of transcoding the target video, the server can detect the encoding bit rate in real time, and adjust the encoding bit rate in time according to the detection results, so as to ensure that the bit rate of the output video is basically the same as the bit rate of the input video. Consistent, so that the effect of video transcoding can be improved.

Based on the same technical concept, the embodiment of the present invention also provides a video transcoding device, as shown in Figure 4, the device includes:

The first obtaining module 401 is used to obtain the video data packet of the target video after decapsulation;

Calculation module 402, for periodically calculating the global average code rate of the target video and the local average code rate within a preset period;

An adjustment module 403, configured to adjust the encoding bit rate according to the global average bit rate and the local average bit rate;

The transcoding module 404 is configured to perform transcoding processing on the target video based on the adjusted coding rate.

Optionally, the calculating module 402 is specifically used for:

accumulating the data volume of the video data packet into the acquired global data volume of the target video and the local data volume of the target video acquired within a preset period;

Determine the decoded duration and preset period duration of the target video according to the decoding timestamp corresponding to the video data packet;

The quotient of the global data amount and the decoded duration is taken as the global average code rate, and the quotient of the local data amount and the preset cycle duration is taken as the local average code rate.

Optionally, the adjustment module 403 is specifically used for:

If the absolute difference between the local average bit rate and the current encoding bit rate is greater than a preset threshold, then determine whether the local average bit rate is greater than a preset minimum bit rate reference value;

If yes, set the encoding bit rate as the local average bit rate; if not, set the maximum value of the global average bit rate and the minimum bit rate reference value as the encoding bit rate.

Optionally, the adjustment module 403 is specifically used for:

If the absolute difference between the local average bit rate and the current encoding bit rate is greater than a preset threshold, and the decoded duration is longer than a preset time length, it is judged whether the local average bit rate is greater than a preset minimum bit rate reference value.

Optionally, the adjustment module is also used for:

If the absolute difference between the local average code rate and the current encoding code rate is greater than the preset threshold, and the decoded duration is less than the preset duration, then the maximum of the local average code rate and the preset maximum code rate reference value value as the code rate.

Optionally, as shown in Figure 5, the device further includes:

The second acquiring module 405 is configured to acquire attribute information of the target video, wherein the attribute information includes at least a target resolution and a target frame rate of the target video;

The first determination module 406 is used to determine the mathematical relationship between the attribute information of the target video and the preset standard attribute information;

The second determining module 407 is configured to determine a minimum code rate reference value and a maximum code rate reference value of the target video according to the mathematical relationship and the standard code rate corresponding to the standard attribute information.

In the embodiment of the present invention, the server obtains the video data packet of the target video after decapsulation, periodically calculates the global average bit rate of the target video and the local average bit rate in the preset period, according to the global average bit rate and the local average bit rate , adjust the encoding bit rate, and perform transcoding processing on the target video based on the adjusted encoding bit rate. In this way, during the process of transcoding the target video, the server can detect the encoding bit rate in real time, and adjust the encoding bit rate in time according to the detection results, so as to ensure that the bit rate of the output video is basically the same as the bit rate of the input video. Consistent, so that the effect of video transcoding can be improved.

Fig. 6 is a schematic structural diagram of a server provided by an embodiment of the present invention. The server 600 can have relatively large differences due to different configurations or performances, and can include one or more central processing units 622 (for example, one or more processors) and memory 632, and one or more storage applications 642 or data 644 storage medium 630 (for example, one or more mass storage devices). Wherein, the memory 632 and the storage medium 630 may be temporary storage or persistent storage. The program stored in the storage medium 630 may include one or more modules (not shown in the figure), and each module may include a series of instruction operations for the server. Furthermore, the central processing unit 622 may be configured to communicate with the storage medium 630 , and execute a series of instruction operations in the storage medium 630 on the server 600 .

The server 600 may also include one or more power supplies 629, one or more wired or wireless network interfaces 650, one or more input and output interfaces 658, one or more keyboards 656, and/or, one or more operating systems 641 , such as Windows Server TM, Mac OS XTM, Unix TM, Linux TM, FreeBSD TM, etc.

The server 600 may include a memory, and one or more programs, wherein one or more programs are stored in the memory, and configured to be executed by one or more processors, including for performing the above-mentioned Instructions for video transcoding.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (15)

1. a kind of method of video code conversion, which is characterized in that the described method includes:

The video data packet of target video after obtaining decapsulation；

Periodically calculate the local average code rate in the global average bit rate and predetermined period of the target video；

According to the global average bit rate and the local average code rate, encoder bit rate is adjusted；

Based on encoder bit rate adjusted, transcoding processing is carried out to the target video；

Wherein, the global average bit rate be all data volumes of the target video got and decoded duration it Quotient, the local average code rate are all data volumes and predetermined period of the target video got in the predetermined period The quotient of duration.

2. the method according to claim 1, wherein the overall situation for periodically calculating the target video is average Local average code rate in code rate and predetermined period, comprising:

The data volume of the video data packet is accumulate to the global data amount of the target video got and is preset week In local data's amount of the target video got in phase；

According to the corresponding decoded time stamp of the video data packet, the duration of decoding and predetermined period of the target video are determined Duration；

Using the global data amount and the quotient for having decoded duration as global average bit rate, and by local data amount and The quotient of the predetermined period duration is as local average code rate.

3. the method according to claim 1, wherein described flat according to the global average bit rate and the part Equal code rate, is adjusted encoder bit rate, comprising:

If the absolute difference of the local average code rate and present encoding code rate is greater than preset threshold, judge that the part is flat Whether equal code rate is greater than preset minimum code rate reference value；

If it is, the local average code rate is set by the encoder bit rate, if it is not, then by the global average code Maximum value in rate and the minimum code rate reference value is as the encoder bit rate.

4. if according to the method described in claim 3, it is characterized in that, the local average code rate and present encoding code The absolute difference of rate is greater than preset threshold, then judges whether the local average code rate is greater than preset minimum code rate reference value, Include:

If the absolute difference of the local average code rate and present encoding code rate is greater than preset threshold, and has decoded duration and be greater than Preset duration, then judge whether the local average code rate is greater than preset minimum code rate reference value.

5. according to the method described in claim 4, it is characterized in that, the method also includes:

If the absolute difference of the local average code rate and present encoding code rate is greater than preset threshold, and has decoded duration and be less than Preset duration, then using the maximum value in the local average code rate and preset maximal rate reference value as the coding code Rate.

6. method according to any one of claim 3 to 5, which is characterized in that the method also includes:

The attribute information of the target video is obtained, the target resolution of the target video is included at least in the attribute information And target frame rate.

7. method according to any one of claim 3 to 5, which is characterized in that the method also includes:

Determine the attribute information of the target video and the mathematical relationship of preset standard attribute information；

According to the mathematical relationship and the corresponding standard code rate of the standard attribute information, the minimum code of the target video is determined Rate reference value and maximal rate reference value.

8. a kind of device of video code conversion, which is characterized in that described device includes:

First obtains module, for obtaining the video data packet of the target video after decapsulating；

Computing module, the local average code in global average bit rate and predetermined period for periodically calculating the target video Rate；

Module is adjusted, for being adjusted to encoder bit rate according to the global average bit rate and the local average code rate；

Transcoding module carries out transcoding processing to the target video for being based on encoder bit rate adjusted；

Wherein, the global average bit rate be all data volumes of the target video got and decoded duration it Quotient, the local average code rate are all data volumes and predetermined period of the target video got in the predetermined period The quotient of duration.

9. device according to claim 8, which is characterized in that the computing module is specifically used for:

The data volume of the video data packet is accumulate to the global data amount of the target video got and is preset week In local data's amount of the target video got in phase；

According to the corresponding decoded time stamp of the video data packet, the duration of decoding and predetermined period of the target video are determined Duration；

Using the global data amount and the quotient for having decoded duration as global average bit rate, and by local data amount and The quotient of the predetermined period duration is as local average code rate.

10. device according to claim 8, which is characterized in that the adjustment module is specifically used for:

If the absolute difference of the local average code rate and present encoding code rate is greater than preset threshold, judge that the part is flat Whether equal code rate is greater than preset minimum code rate reference value；

If it is, the local average code rate is set by the encoder bit rate, if it is not, then by the global average code Maximum value in rate and the minimum code rate reference value is as the encoder bit rate.

11. device according to claim 10, which is characterized in that the adjustment module is specifically used for:

If the absolute difference of the local average code rate and present encoding code rate is greater than preset threshold, and has decoded duration and be greater than Preset duration, then judge whether the local average code rate is greater than preset minimum code rate reference value.

12. device according to claim 11, which is characterized in that the adjustment module is also used to:

If the absolute difference of the local average code rate and present encoding code rate is greater than preset threshold, and has decoded duration and be less than Preset duration, then using the maximum value in the local average code rate and preset maximal rate reference value as the coding code Rate.

13. device according to any one of claims 10 to 12, which is characterized in that described device further include:

Second obtains module, for obtaining the attribute information of the target video, includes at least the mesh in the attribute information Mark the target resolution and target frame rate of video.

14. device according to any one of claims 10 to 12, which is characterized in that described device further include:

First determining module, for determining the attribute information of the target video and the mathematics pass of preset standard attribute information System.

15. device according to claim 14, which is characterized in that described device further include:

Second determining module, for determining institute according to the mathematical relationship and the corresponding standard code rate of the standard attribute information State the minimum code rate reference value and maximal rate reference value of target video.