TW201828696A - Transcoding method and device capable of guaranteeing that the media document can be played smoothly and clearly - Google Patents

Abstract

The embodiment of the present invention discloses a transcoding method and device. The method comprises: obtaining an initial resolution of a media document; confirming a first clearness gear position and a second clearness gear position corresponding to the media document; confirming a first resolution corresponding to the first clearness gear position, and a second resolution corresponding to the second clearness gear position; using a first preset rule to proceed with precoding based on the first resolution and the second resolution, so as to obtain a first precoding bit rate corresponding to the first clearness gear rate, and a second precoding bit rate corresponding to the second clearness gear rate; if the first precoding bit rate is greater than a preset bit rate threshold, adjusting the first resolution and the second resolution; and using the first preset rule to proceed with transcoding on the media document based on the adjusted first resolution and second resolution. With the transcoding method and device provided in the embodiment of the present invention, it is able to guarantee that the media document can be played smoothly and clearly.

Description

 Transcoding method and device  

The present invention relates to the field of information processing technologies, and in particular, to a transcoding method and apparatus.

With the continuous development of mobile communication technology, the rapid increase of network access speed, the more intelligent mobile terminals, and the increasingly optimized digital compression technology, mobile terminals have evolved from simple communication and communication tools to a multimedia wisdom. platform. Mobile streaming media is a combination of mobile communication and streaming media transmission. The mobile network uses streaming media technology to transmit data on mobile terminals, providing users with services including video on demand, mobile video chat, and motion video surveillance. .

Transcoding is to compress high-definition large media files (such as video files) into suitable network scenarios (such as fiber-optic network, WIFI network, 3G network, etc.) and some terminals (such as TV, PC, The process of file/streaming played by mobile phones, PADs, etc.). Generally, the smaller the media file is compressed, the more suitable it is to transmit in a bandwidth-limited environment, but the display quality of the media file may be worse.

The existing transcoding method generally includes: setting transcoding parameters corresponding to different definitions in advance, for example, the definition may include: smooth, standard definition, high definition, and ultra clear, and the resolutions corresponding to the four definitions may be separately set. Degree and upper bit rate. Instantly calculating the instantaneous bit rate of the media file according to the preset resolution and the content of the media file, and preventing the media file from being stuck when the instantaneous bit rate is greater than the upper limit bit rate corresponding to the resolution Phenomenon, the upper limit bit rate can be used to replace the current instantaneous bit rate to ensure that the media file can be played smoothly.

In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: the bit rate instantaneous bit rate in the existing transcoding method is calculated according to the preset resolution and the content of the media file, Under the two parameters of the preset resolution and the bit rate instantaneous bit rate, the current content of the media file can be clearly played. When the bit rate instantaneous bit rate is greater than the upper limit bit rate corresponding to the resolution, The upper limit bit rate is used for transcoding, and the clarity of the current content playback of the media file may not be guaranteed if the media file is played smoothly.

An object of the embodiments of the present invention is to provide a transcoding method and apparatus to ensure that media files are played smoothly and clearly.

In order to solve the above technical problem, an embodiment of the present invention provides a transcoding method and apparatus, which are implemented by: a transcoding method, comprising: acquiring attribute information of a media file, where the attribute information includes an initial resolution; The initial resolution, the preset plurality of resolution gears, and the resolution range corresponding to each of the resolution gears, determining a first definition gear position corresponding to the media file, and the preset plurality of resolutions a second definition gear position corresponding to the media file in the lowest definition gear position in the gear position; using the initial resolution of the media file as the first resolution, and the first resolution according to the first resolution Determining a rank in the resolution range corresponding to the gear position to determine a second resolution having the same rank in the resolution range corresponding to the second sharpness gear; according to the first resolution and the second resolution And precoding the media file by using a first preset rule, to obtain a first precoding bit rate corresponding to the first definition gear position and a second precoding bit rate corresponding to the second definition gear position; If the first precoding bit rate is greater than a preset bit rate threshold corresponding to the first definition bit position, adjusting the first clear according to the first precoding bit rate and the preset bit rate threshold a first resolution corresponding to the degree gear and a second resolution corresponding to the second definition gear; and based on the adjusted first resolution and the adjusted second resolution, using the first preset rule The media file is transcoded.

A transcoding device includes: a media file acquisition module, a definition gear position determination module, a resolution determination module, a precoding bit rate determination module, a resolution adjustment module, and a transcoding module; a media file obtaining module, configured to obtain attribute information of a media file, where the attribute information includes an initial resolution; the definition gear position determining module is configured to be based on an initial resolution of the media file, and a preset Determining a range of resolutions corresponding to the plurality of definition gears and the resolution points corresponding to the respective resolution gears, determining a first definition gear position corresponding to the media file, and setting a minimum resolution file among the preset plurality of resolution gear positions a second resolution gear corresponding to the media file; the resolution determining module is configured to use the initial resolution of the media file as a first resolution, and the first resolution according to the first resolution Determining a rank in the resolution range corresponding to the sharpness scale to determine a second resolution having the same rank in the resolution range corresponding to the second sharpness scale; the precoding bit rate determining module, Used according to the The first resolution and the second resolution are used to pre-code the media file by using a first preset rule to obtain a first pre-coding bit rate corresponding to the first sharpness level and a second-definition position corresponding to the second resolution a second pre-coding bit rate; the resolution adjusting module, configured to: when the first pre-encoding bit rate is greater than a preset bit rate threshold corresponding to the first sharpness level, according to the first pre-coding a bit rate and a preset bit rate threshold, adjusting a first resolution corresponding to the first definition gear and a second resolution corresponding to the second definition gear; the transcoding module is configured to The adjusted first adjustment degree and the adjusted second resolution of the resolution adjustment module, and the media file is transcoded by using the first preset rule.

According to the technical solution provided by the embodiment of the present invention, the method and device for transcoding according to the embodiment of the present invention can determine the resolution of different resolution files according to the initial resolution of the media file, and the analysis is based on the determination. And precoding the media file, when the precoding bit rate is greater than a preset bit rate threshold, the media file may not be played smoothly, according to the precoding bit rate and The preset bit rate threshold is used to adjust the resolution corresponding to each definition, and then the media file is transcoded according to the adjusted resolution, so that the media file can be played smoothly and clearly.

S101‧‧‧Steps

S102‧‧‧Steps

S103‧‧‧Steps

S104‧‧‧Steps

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201‧‧‧Media File Acquisition Module

202‧‧‧Shape gear determination module

203‧‧‧resolution determination module

204‧‧‧Pre-coded bit rate determination module

205‧‧‧resolution adjustment module

206‧‧‧ Transcoding module

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only Some of the embodiments described in the invention can be obtained by those skilled in the art from the drawings without further progressive labor.

1 is a flow chart of an embodiment of a transcoding method of the present invention; and FIG. 2 is a block diagram of an embodiment of a transcoding device of the present invention.

Embodiments of the present invention provide a transcoding method and apparatus.

In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart of one embodiment of a transcoding method of the present invention. As shown in FIG. 1, the transcoding method may include:

S101: Acquire attribute information of the media file, where the attribute information includes an initial resolution.

You can get the attribute information of the media file. The media file can be a video file.

The attribute information may include: initial resolution. The attribute information may further include: an initial bit rate of the media file.

S102: Determine, according to an initial resolution of the media file, a preset plurality of resolution gear positions, and a resolution range corresponding to each resolution gear position, determining a first definition gear position corresponding to the media file, The lowest definition gear position among the plurality of preset sharpness gear positions is used as the second sharpness gear position corresponding to the media file.

The preset plurality of definition gear positions may include: 4 definition gear positions. The four sharpness positions from the highest definition to the lowest definition may be: ultra clear, high definition, standard definition, smooth. The resolution range and resolution ranking corresponding to the above resolution positions can be as shown in Table 1. In the resolution range corresponding to each resolution gear in Table 1, at least three resolutions may be included, which may be sequentially arranged in descending order of resolution.

The first definition gear position corresponding to the media file may be determined according to each resolution gear position and its corresponding resolution range and resolution ranking according to Table 1. The first definition gear position can be used to indicate the highest resolution achievable by the media file.

The second definition gear position corresponding to the media file may be the lowest definition gear position among the preset plurality of definition gear positions. For example, if the preset plurality of sharpness positions from the highest definition to the lowest definition may be: ultra clear, high definition, standard definition, smooth, then the second definition position may be “smooth” "The gear.

The first resolution gear position may be determined according to a resolution range corresponding to each preset resolution gear position and an initial resolution of the media file, where the resolution range corresponding to the initial resolution is The sharpness gear can be the first sharpness gear. For example, if the initial resolution of the media file is 1920×1080, the first definition gear position may be “super clear” gear position; if the initial resolution of the media file is 848×480, then The first definition gear position may be a "standard definition" gear position.

S103: using the initial resolution of the media file as the first resolution, determining, according to the ranking of the first resolution in the resolution range corresponding to the first definition gear, in the second definition gear A second resolution having the same rank in the corresponding resolution range.

The initial resolution of the media file may be taken as the first resolution.

The second resolution corresponding to the second definition gear position may be determined according to the ranking of the first resolution in the resolution range corresponding to the first definition gear position. Specifically, the ranking of the second resolution in the resolution range corresponding to the second definition gear is the same as the ranking of the first resolution in the resolution range corresponding to the first definition gear. For example, the first definition gear position is a “high definition” gear position, and the second definition gear position is a “fluent” gear position; the first resolution is 1392×784, which is in a resolution corresponding to the “high definition” gear position. The first position of the range, then the second resolution corresponding to the second resolution gear may be 624×352, which is located at the first position of the resolution range corresponding to the “smooth” gear position.

S104: Precoding the media file by using a first preset rule according to the first resolution and the second resolution, to obtain a first precoding bit rate and a second clearness corresponding to the first definition gear position. The second pre-coded bit rate corresponding to the degree gear.

According to the first resolution and the second resolution, the media file may be pre-coded by using a first preset rule, and the first pre-coding bit rate and the second clearness corresponding to the first definition gear position may be obtained. The second pre-coded bit rate corresponding to the degree gear.

The first preset rule may include performing precoding according to a CRF (constant rate factor) value or a fixed QP (quantization parameter) value. For example, the video can be encoded according to CRF=26 or QP=29. In general, a value of CRF of 18 indicates that the quality of the media file is basically lossless. A value of CRF of 19-21.5 indicates that the quality of the media file is high quality, and a value of C-26 of 22-26 indicates that the quality of the media file is medium quality. The value range of QP is generally 0~51. The larger the value, the worse the quality of media files. For general Internet video files, if QP>35, the quality of media files is very poor. Therefore, in a preferred embodiment, the CRF may range from 19 to 26. In a preferred embodiment, the QP may range from 0 to 35.

In another embodiment, the pre-coding the media file by using the first preset rule may further include: extracting a plurality of segments of the media file for precoding, and precoding the plurality of segments separately. The bit rate values are averaged, and the obtained average value is taken as a precoding bit rate. By precoding a plurality of segments, the precoding time can be saved, thereby improving the transcoding efficiency.

S105: If the first precoding bit rate is greater than a preset bit rate threshold corresponding to the first definition bit position, adjusting the first according to the first precoding bit rate and the preset bit rate threshold The first resolution corresponding to the sharpness gear and the second resolution corresponding to the second sharpness.

It may be determined whether the first precoding bit rate is greater than a preset bit rate threshold corresponding to the first definition bit position. The preset bit rate threshold may be a maximum bit rate value that the media file can clearly play at the first resolution. If the first pre-coding bit rate is greater than the preset bit rate threshold, it may be indicated that the content of the media file cannot be played smoothly when the media file is transcoded according to the first resolution.

If the first precoding bit rate is greater than a preset bit rate threshold corresponding to the first definition bit position, the first definition may be adjusted according to the first precoding bit rate and the preset bit rate threshold The first resolution corresponding to the gear position and the second resolution corresponding to the second sharpness gear position. The method may include: determining, according to the preset bit rate threshold and the preset coefficient, a magnitude of the decrease of the first resolution and the second resolution, and determining the adjusted first resolution according to the reduced amplitude and Second resolution.

The determining the magnitude of the decrease of the first resolution and the second resolution based on the preset bit rate threshold and the preset coefficient may specifically include: determining whether the first precoding bit rate is greater than or a product equal to a power of the second power of the preset coefficient and the preset bit rate threshold. If yes, the first resolution and the second resolution are respectively adjusted to be reduced by two ranks in the corresponding sharpness position. The resolution value after. The value of the preset coefficient may be greater than 1. Preferably, the preset coefficient may have a value of 1.1 to 1.5.

For example, suppose the first resolution is 1392×784, which is in the first position of the resolution range corresponding to the “high-definition” gear position, and the second resolution is 624×352, which is located in the resolution range corresponding to the “smooth” gear position. First place. The first precoding bit rate obtained by the first resolution precoding is BitRates, and the preset bit rate threshold is MaxRate. It is judged that BitRates>MaxRate*scale*scale, where scale is the preset coefficient. Then, it can be determined that the first resolution and the second resolution respectively need to be adjusted to reduce the resolution value after the two ranks in the corresponding sharpness scale. Then, the adjusted first resolution and second resolution may be: 1356×864 and 480×272, respectively.

Further, if the first precoding bit rate is less than a product of the second power of the preset coefficient and the preset bit rate threshold, it may be further determined whether the first encoding bit rate is greater than or equal to the The product of the preset bit rate threshold and the preset coefficient, if yes, the first resolution and the second resolution are respectively adjusted to reduce the resolution value after one ranking in the corresponding sharpness position.

Further, if the first coding bit rate is less than a product of the preset bit rate threshold and the preset coefficient, the first resolution and the second resolution may not be adjusted.

Adjusting the resolution within the same sharpness position ensures that the resolution of the media file is unchanged. At the same time, by reducing the resolution, the bit rate value after transcoding can be made smaller than the preset bit rate threshold, and the media file can be played smoothly.

S106: Transcode the media file by using the first preset rule based on the adjusted first resolution and the adjusted second resolution.

The media file may be transcoded by using the first preset rule based on the adjusted first resolution and the adjusted second resolution. Transcoding the media file according to the adjusted first resolution and the adjusted second resolution ensures that the media file is played smoothly and clearly.

In another embodiment, if the first precoding bit rate is less than or equal to the preset bit rate threshold of the first sharpness position, it may be that the transcoding according to the first resolution and the second resolution may be performed. The media file is played smoothly and clearly, and therefore, the media file can be transcoded based on the first resolution and the second resolution.

In another embodiment, when the plurality of sharpness gears are at least 3 sharpness gears and the first sharpness gear is the highest sharpest gear among the plurality of preset sharpness gears The method may further include: determining an intermediate resolution corresponding to the at least one intermediate definition gear position between the first definition gear position and the second definition gear position, based on the first resolution, the second resolution And the intermediate resolution, using a second preset algorithm, calculating an intermediate precoding bit rate corresponding to the intermediate definition gear.

Further, when the first resolution corresponding to the first definition gear position and the second resolution corresponding to the second definition gear position are adjusted according to the first pre-coding bit rate and the preset bit rate threshold The intermediate resolution corresponding to the intermediate definition gear position can be adjusted. Correspondingly, the media file may be transcoded by using the first preset rule based on the adjusted first resolution, the adjusted second resolution, and the adjusted intermediate resolution. The method for adjusting the intermediate resolution may be the same as the method for adjusting the first resolution, and the present invention is not described herein again.

Wherein, determining an intermediate resolution of at least one intermediate definition gear position between the first definition gear position and the second definition gear position may adopt a method for determining a second resolution corresponding to the second definition gear position . Specifically, the intermediate resolution corresponding to the intermediate definition gear position may be determined according to the ranking of the first resolution in the resolution range corresponding to the first definition gear position. The ranking of the intermediate resolution in the resolution range corresponding to the intermediate definition gear is the same as the ranking of the first resolution in the resolution range corresponding to the first definition gear. For example, the first definition gear position is a “high definition” gear position, and the second definition gear position is a “fluent” gear position, then there may be a between the first definition gear position and the second definition gear position. Intermediate definition gear "standard definition" gear. The first resolution corresponding to the first sharpness position is 1392×784, which is in the first position of the resolution range corresponding to the “high definition” gear position, then the intermediate resolution corresponding to the intermediate definition gear position may be 944×528, which is the first place in the resolution range corresponding to the “standard definition” gear.

The second preset algorithm may include: an interpolation algorithm. Specifically, a linear relationship between the resolution and the precoding bit rate may be calculated according to the first resolution, the second resolution, the first precoding bit rate, and the second precoding bit rate, according to the linear relationship, An intermediate precoding bit rate corresponding to the intermediate resolution can be calculated. The intermediate precoding bit rate corresponding to the intermediate resolution of the intermediate definition gear is calculated by the interpolation algorithm, and the calculated precoding bit rate can be matched with the resolution, thereby ensuring the resolution of the intermediate definition gear. Media files can be played smoothly and clearly.

The transcoding method provided by the foregoing embodiment may determine the resolution of the different resolution gears according to the initial resolution of the media file, and based on the determined resolution, the media file may be pre-coded first. When the precoding bit rate is greater than the preset bit rate threshold, the media file may not be played smoothly, and the resolution of the media file may be adjusted according to the precoding bit rate and the preset bit rate threshold. Corresponding resolution, and then transcoding the media file according to the adjusted resolution, can ensure that the media file is played smoothly and clearly.

An embodiment of the transcoding device of the present invention will now be described.

2 is a block diagram of one embodiment of a transcoding device of the present invention. As shown in FIG. 2, the transcoding device may include: a media file obtaining module 201, a definition gear position determining module 202, a resolution determining module 203, a precoding bit rate determining module 204, and a resolution adjustment. Module 205 and transcoding module 206. The media file obtaining module 201 can be used to obtain attribute information of the media file. The attribute information may include: initial resolution. The attribute information may also include an initial bit rate of the media file.

The definition gear position determining module 202 can be configured to determine the media file according to an initial resolution of the media file, a preset plurality of resolution gear positions, and a resolution range corresponding to each resolution gear position. Corresponding first definition gear position, the lowest definition gear position of the preset plurality of definition gear positions is used as the second definition gear position corresponding to the media file.

The resolution determining module 203 may be configured to use the initial resolution of the media file as the first resolution, and rank in the resolution range corresponding to the first resolution gear according to the first resolution. And determining a second resolution having the same rank in the resolution range corresponding to the second definition gear.

The pre-coding bit rate determining module 204 may be configured to pre-code the media file by using a first preset rule according to the first resolution and the second resolution to obtain a first definition gear position. Corresponding first precoding bit rate and second precoding bit rate corresponding to the second sharpness gear.

The resolution adjustment module 205 may be configured to: when the first precoding bit rate is greater than a preset bit rate threshold corresponding to the first definition bit position, according to the first precoding bit rate and The preset bit rate threshold is used to adjust the first resolution corresponding to the first definition gear position and the second resolution corresponding to the second definition gear position.

The transcoding module 206 can be configured to transcode the media file by using a first preset rule based on the adjusted first resolution and the adjusted second resolution.

In another embodiment, when the first precoding bit rate is less than or equal to a preset bit rate threshold of the first sharpness position, the transcoding module 206 may be further configured to be based on the first The resolution, the second resolution, transcoding the media file by using a first preset rule.

In another embodiment, when the plurality of definition gear positions are greater than the at least 3 definition gear positions and the first definition gear position is the highest resolution among the plurality of resolution positions The bit position determination module 202 can also be configured to determine at least one intermediate definition gear position between the first definition gear position and the second definition gear position. Correspondingly, the resolution determining module 203 is further configured to determine an intermediate resolution corresponding to the at least one intermediate definition gear. The precoding bit rate determining module 204 is further configured to calculate, by using the second preset algorithm, the intermediate resolution file based on the first resolution, the second resolution, and the intermediate resolution. The intermediate precoding bit rate corresponding to the bit.

Further, the resolution adjustment module 205 is further configured to adjust an intermediate resolution corresponding to the intermediate definition gear position. The transcoding module 206 can be further configured to transcode the media file by using a first preset rule based on the adjusted first resolution, the adjusted second resolution, and the adjusted intermediate resolution. .

The transcoding device provided in the foregoing embodiment corresponds to the embodiment of the transcoding method of the present invention, and the method embodiment of the present invention can be implemented to obtain the technical effects of the method embodiment of the present invention.

In the 1990s, improvements to a technology could clearly distinguish between hardware improvements (eg, improvements to circuit structures such as diodes, transistors, switches, etc.) or software improvements (for method flow). Improve). However, as technology advances, many of today's method flow improvements can be seen as direct improvements in hardware circuit architecture. Designers almost always get the corresponding hardware structure by programming the improved method flow into the hardware circuit. Therefore, it cannot be said that the improvement of a method flow cannot be implemented by a hardware entity module. For example, a Programmable Logic Device (PLD) (such as a Field Programmable Gate Array (FPGA)) is an integrated circuit whose logic function is determined by the user to program the device. . Designers can program themselves to "integrate" a digital system onto a single PLD without having to ask the chip manufacturer to design and fabricate a dedicated integrated circuit die2. Moreover, today, instead of manually making integrated circuit chips, this programming is mostly implemented using a "logic compiler" software, which is similar to the software compiler used in programming development. The original code before compilation must also be written in a specific programming language. This is called Hardware Description Language (HDL), and HDL is not the only one, but there are many kinds, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, RHDL (Ruby Hardware Description Language), etc. VHDL (Very-High-Speed Integrated Circuit Hardware Description Language) and Verilog2 are currently the most commonly used. It should also be clear to those skilled in the art that the hardware flow of the logic method flow can be easily obtained by simply designing and programming the method flow into the integrated circuit with the above hardware description languages.

The controller can be implemented in any suitable manner, for example, the controller can be readable by, for example, a microprocessor or processor and a computer readable code (e.g., software or firmware) that can be executed by the (micro)processor. Media, logic gates, switches, Application Specific Integrated Circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, The Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, memory controllers can also be implemented as part of the memory's control logic.

Those skilled in the art also know that, besides implementing the controller in a purely computer readable code, the controller can be logically programmed by logic steps, switches, dedicated integrated circuits, and programmable logic. Controllers and embedded microcontrollers, etc., implement the same functionality. Thus such a controller can be considered a hardware component, and the means for implementing various functions included therein can also be considered as a structure within the hardware component. Or even a device for implementing various functions can be considered as either a software module implementing the method or a structure within the hardware component.

The system, device, module or unit illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product having a certain function.

For the convenience of description, the above devices are described separately by function into various units. Of course, the functions of the various units may be implemented in the same or multiple software and/or hardware in the practice of the invention.

As can be seen from the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of a software plus a necessary universal hardware platform. Based on this understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product. In a typical configuration, the computing device includes one or more processors (CPUs). , input / output interface, network interface and memory. The computer software product can include instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments. The computer software product can be stored in a memory, and the memory may include non-permanent memory, random access memory (RAM) and/or non-volatile memory in a computer readable medium, such as a read only memory. Body (ROM) or flash memory (flash RAM). Memory is an example of a computer readable medium. Computer readable media including both permanent and non-permanent, removable and non-removable media can be stored by any method or technology. Information can be computer readable instructions, data structures, modules of programs, or other materials. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), and other types of random access memory (RAM). Read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM only, digitally versatile A compact disc (DVD) or other optical storage, magnetic cassette, magnetic tape storage or other magnetic storage device or any other non-transportable medium can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include transitory computer readable media, such as modulated data signals and carrier waves.

The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

The invention is applicable to a wide variety of general purpose or special purpose computer system environments or configurations. For example: PCs, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, small computers , large computers, decentralized computing environments including any of the above systems or devices, and so on.

The invention may be described in the general context of computer-executable instructions executed by a computer, such as a program module. Generally, a program module includes routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types. The invention may also be practiced in a distributed computing environment in which tasks are performed by remote processing devices that are connected by means of a communication network. In a decentralized computing environment, the program modules can be located in areas including storage devices and in remote computer storage media.

Although the present invention has been described by way of example, it is understood by those of ordinary skill in the art spirit.

Claims (17)

 A transcoding method includes: acquiring attribute information of a media file, where the attribute information includes an initial resolution; according to an initial resolution of the media file, a preset plurality of resolution files, and corresponding resolution positions a resolution range, determining a first definition gear position corresponding to the media file, and using a lowest definition gear position of the preset plurality of resolution gear positions as a second definition file corresponding to the media file Bit; using the initial resolution of the media file as the first resolution, determining the second sharpness position according to the ranking of the first resolution in the resolution range corresponding to the first sharpness position a second resolution having the same rank in the corresponding resolution range; precoding the media file by using the first preset rule according to the first resolution and the second resolution, to obtain a first resolution file a first precoding bit rate corresponding to the bit and a second precoding bit rate corresponding to the second sharpness bit; if the first precoding bit rate is greater than a preset bit corresponding to the first sharpness Rate threshold Adjusting, by the first pre-coding bit rate and the preset bit rate threshold, a first resolution corresponding to the first sharpness position and a second resolution corresponding to the second sharpness position; The first resolution and the adjusted second resolution are used to transcode the media file by using a first preset rule.    The transcoding method according to the first aspect of the invention, wherein the determining, according to an initial resolution of the media file, a preset plurality of sharpness positions, and a resolution range corresponding to each sharpness position, The first definition gear position corresponding to the media file includes: the resolution gear position corresponding to the resolution range in which the initial resolution is located is the first definition gear position.    The transcoding method of claim 1, wherein the precoding the media file by using the first preset rule comprises: performing precoding according to a fixed bit rate coefficient value or a fixed quantization parameter value.    The transcoding method of claim 3, wherein the precoding the media file by using the first preset rule comprises: extracting a plurality of segments of the media file for precoding, The bit rate values obtained by the plurality of segment precodings are averaged, and the obtained average value is used as the precoding bit rate.    The transcoding method of claim 1, wherein the preset bit rate threshold comprises: a maximum bit rate value of the media file that is clearly played at the first resolution.    The transcoding method according to claim 1, wherein the first resolution and the first resolution corresponding to the first definition gear are adjusted according to the first precoding bit rate and the preset bit rate threshold The second resolution corresponding to the second resolution gear includes: determining, according to the preset bit rate threshold and the preset coefficient, a magnitude of the decrease of the first resolution and the second resolution, according to the reducing The magnitude of the adjustment determines the adjusted first resolution and second resolution.    The transcoding method of claim 6, wherein the determining the reduction of the first resolution and the second resolution based on the preset bit rate threshold and the preset coefficient comprises: Determining whether the first precoding bit rate is greater than or equal to a product of a second power of the preset coefficient and the preset bit rate threshold; if yes, the first resolution and the second resolution are respectively adjusted to The resolution value after the two ranks is lowered in the corresponding sharpness position.    The transcoding method according to claim 7, wherein if the first precoding bit rate is less than a product of a second power of the preset coefficient and the preset bit rate threshold, the method further The method includes: determining whether the first encoding bit rate is greater than or equal to a product of the preset bit rate threshold and a preset coefficient; if yes, the first resolution and the second resolution are respectively adjusted to correspond to The resolution value after one rank is lowered in the sharpness scale.    The transcoding method according to any one of claims 6-8, wherein the range of the preset coefficients includes: greater than 1.    The transcoding method of claim 1, wherein the method further comprises: if the first precoding bit rate is less than or equal to a preset bit rate threshold corresponding to the first definition bit position, Transmitting the media file based on the first resolution and the second resolution.    The transcoding method according to claim 1, wherein when the plurality of definition gear positions are at least 3 definition gear positions and the first definition gear position is a preset plurality of resolutions, The method further includes: determining an intermediate resolution corresponding to at least one intermediate definition gear position between the first definition gear position and the second definition gear position; The first resolution, the second resolution, and the intermediate resolution are calculated by using a second preset algorithm to calculate an intermediate precoding bit rate corresponding to the intermediate definition gear.    The transcoding method according to claim 11, wherein the intermediate resolution corresponding to the intermediate gear position is based on the ranking of the first resolution in a resolution range corresponding to the first sharpness gear. Determining, in particular, the ranking of the intermediate resolution in the resolution range corresponding to the intermediate definition gear is the same as the ranking of the first resolution in the resolution range corresponding to the first definition gear.    The transcoding method according to claim 11 or 12, wherein the second preset algorithm comprises: an interpolation algorithm.    A transcoding device includes: a media file acquisition module, a definition gear position determination module, a resolution determination module, a precoding bit rate determination module, a resolution adjustment module, and a transcoding module; The media file obtaining module is configured to obtain attribute information of the media file, where the attribute information includes an initial resolution; the definition gear position determining module is configured to be configured according to an initial resolution of the media file, and a preset Determining a range of resolutions corresponding to the plurality of definition gears and the resolution points corresponding to the respective resolution gears, determining a first definition gear position corresponding to the media file, and setting a minimum resolution file among the preset plurality of resolution gear positions a second resolution gear corresponding to the media file; the resolution determining module is configured to use the initial resolution of the media file as a first resolution, and the first resolution according to the first resolution Determining a rank in the resolution range corresponding to the sharpness scale to determine a second resolution having the same rank in the resolution range corresponding to the second sharpness scale; the precoding bit rate determining module, Used according to the The first resolution and the second resolution are used to pre-code the media file by using a first preset rule to obtain a first pre-coding bit rate corresponding to the first sharpness level and a second-definition position corresponding to the second resolution a second pre-coding bit rate; the resolution adjusting module, configured to: when the first pre-encoding bit rate is greater than a preset bit rate threshold corresponding to the first sharpness level, according to the first pre-coding a bit rate and a preset bit rate threshold, adjusting a first resolution corresponding to the first definition gear and a second resolution corresponding to the second definition gear; the transcoding module is configured to The adjusted first adjustment degree and the adjusted second resolution of the resolution adjustment module, and the media file is transcoded by using the first preset rule.    The transcoding device of claim 14, wherein the transcoding module is when the first precoding bit rate is less than or equal to a preset bit rate threshold of the first definition bit position The method further uses the first preset rule to transcode the media file based on the first resolution and the second resolution.    The transcoding device of claim 14, wherein the plurality of sharpness positions are greater than at least three sharpness positions and the first sharpness position is a preset plurality of clear The sharpness gear determining module is further configured to determine at least one intermediate sharpness between the first sharpness gear and the second sharpness gear when the highest resolution gear is in the gear position The resolution determining module is further configured to determine an intermediate resolution corresponding to the at least one intermediate definition gear position; the precoding bit rate determining module is further configured to be based on the first resolution And a second resolution and the intermediate resolution, using a second preset algorithm to calculate an intermediate precoding bit rate corresponding to the intermediate definition gear.    The transcoding device of claim 16, wherein the resolution adjustment module is further configured to adjust an intermediate resolution corresponding to the intermediate definition gear; correspondingly, the transcoding module, The method further uses the first preset rule to transcode the media file based on the adjusted first resolution, the adjusted second resolution, and the adjusted intermediate resolution.