CN106028139A - Real-time transcoding method and device for use in frame rate reducing process - Google Patents
Real-time transcoding method and device for use in frame rate reducing process Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440281—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the temporal resolution, e.g. by frame skipping
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/107—Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh
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- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
- H04N19/122—Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
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- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
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Abstract
The invention discloses a real-time transcoding method for use in a frame rate reducing process. The method comprises the following steps: judging whether a current frame needs to be extracted and discarded or not under an equal-interval extraction situation according to a frame rate of an input code stream and a frame rate of a target code stream; extracting and discarding a first non-reference frame after the current frame if the current frame needs to be extracted and discarded and is a reference frame, and extracting and discarding the current frame if the current frame needs to be extracted and discarded and is a non-reference frame; and decoding the non-discarded current frame to obtain a current decoded frame, and predicting a frame type and macroblock coding information of a transcoded frame according to a frame type and macroblock coding information of the current frame in order to code the current decoded frame. The invention also discloses a real-time transcoding device for use in the frame rate reducing process. According to the real-time transcoding method and device for use in the frame rate reducing process provided by the invention, the reference frame is kept in the frame rate reducing process, and the frame type and the macroblock coding information of the transcoded frame which corresponds to the current frame are predicted to perform transcoding, so that efficient real-time transcoding is realized.
Description
Technical field
The present invention relates to video technique field, particularly relate to a kind of real-time transcoding method dropping frame per second and dress
Put.
Background technology
Along with the universal of 4K TV and the increase of family's bandwidth, people are live to high-quality video
Demand also gets more and more.4K TV refers to that screen display uses the television set of 4K resolution.4K resolution
It is the resolution standard of a kind of emerging digital movie and digital content, gains the name in its horizontal resolution about
It is 4000 pixels (pixel), there is trickle gap according to different applications.4K rank
Resolution can provide ten thousand pixel more than 880, is at least provided that the display quality of nearly ten million pixel, it is achieved electricity
The image quality of shadow level, is equivalent to when, more than four times of the 1080p resolution of perclimax, display sophistication is
More than 4 times of 1080p.
Certainly the cost of ultra high-definition is also high, and during 4K shows, the data volume of each frame all reaches
50MB, therefore the real-time transcoding of 4K is huge to the resource consumption of transcoder.
A process first decoding, re-encoding on the process nature of transcoding, purpose mainly keep with
The video code model of the terminal unit of spectators is consistent, and adapts to the different network bandwidth, different
Terminal processing capacity and different user's requests.
In the case of fall frame per second transcoding, it is common that equally spaced extract frame to be abandoned, such as input
Code stream is 60 frames/second, and the target code stream of coding is 30 frames/second, then need just to abandon a frame every a frame,
Per second needs altogether abandons 30 frames.The real-time transcoding mode of existing this fall frame per second, transcoding efficiency is not high enough,
It is therefore desirable to propose the real-time transcoding technical scheme of a kind of high efficiency fall frame per second.
Summary of the invention
It is an object of the present invention to provide the new solution of a kind of real-time transcoding dropping frame per second, it is possible to
There is higher transcoding efficiency.
According to the first aspect of the invention, it is provided that a kind of real-time transcoding method dropping frame per second, including with
Lower step:
Frame per second according to input code flow and the frame per second of target code stream, it is judged that in the case of extracted at equal intervals,
Whether present frame should be extracted abandons；
If present frame should be extracted and abandon and present frame is reference frame, then retain present frame and change
First non-reference frame after present frame is abandoned for extraction；If present frame should be extracted and abandon also
And present frame is non-reference frame, then extraction abandons present frame；
If present frame is not extracted and abandons, then it is decoded present frame obtaining current decoded frame,
And during decoding, obtain frame type and the macroblock coding information of present frame, according to the frame of present frame
Type and the frame type of transcoding frame corresponding to macroblock coding information prediction present frame and macroblock coding information,
Described current decoded frame is encoded by frame type and macroblock coding information according to the transcoding frame doped.
Further, described input code flow uses H.264 video code model；By the frame type of present frame
As the frame type of transcoding frame corresponding to present frame, wherein said frame type include intraframe predictive coding frame,
Forward-predictive-coded frames or bi-directional predictive coding frame.
Further, when the inter-coded macroblocks of described intraframe predictive coding frame is encoded, count in advance
Calculation carries out the Coding cost encoded with 8 × 8 macroblock modes；Obtain and described frame from described input code flow
The former macroblock mode that the identical macro block in the current inter-coded macroblocks position of intraprediction encoding frame is corresponding；Root
According to described former macroblock mode and described Coding cost, the coding mode of described inter-coded macroblocks is selected
Select.
Further, when described forward-predictive-coded frames is encoded, obtain from described input code flow
The original encoding pattern that the macro block identical with the current coding macro block position of described forward-predictive-coded frames is corresponding；
Carry out estimation according to described original encoding pattern, thus obtain motion vector；Vow according to described motion
Amount carries out motion compensated predictive coding to described forward-predictive-coded frames.
Further, when described bi-directional predictive coding frame is encoded, obtain from described input code flow
The original encoding pattern that the macro block identical with the current coding macro block position of described bi-directional predictive coding frame is corresponding；
Optimum described two-way of the B_DIRECT model selection opened according to described original encoding pattern and acquiescence
The coding mode of encoded predicted frame.
According to the second aspect of the invention, it is provided that a kind of real-time transcoding device dropping frame per second, including frame
Abstraction module, decoder module and coding module；
Described frame abstraction module, for the frame per second according to input code flow and the frame per second of target code stream, it is judged that
In the case of extracted at equal intervals, whether present frame should be extracted abandons；And, if present frame
Should be extracted and abandon and present frame is reference frame, then retain present frame and change extraction into and abandon currently
First non-reference frame after frame, if present frame should be extracted and abandon and present frame is non-ginseng
Examine frame, then extraction abandons present frame；
Described decoder module, in the case of present frame is not extracted and abandons, enters present frame
Row decoding obtains current decoded frame, and obtains frame type and the macro block volume of present frame during decoding
Code information；
Described coding module, in the case of present frame is not extracted and abandons, according to present frame
Frame type and the frame type of transcoding frame corresponding to macroblock coding information prediction present frame and macroblock coding
Information, described current decoded frame is entered by frame type and macroblock coding information according to the transcoding frame doped
Row coding.
Further, described input code flow uses H.264 video code model；Described coding module, uses
In using the frame type of present frame as the frame type of transcoding frame corresponding to present frame, wherein said frame type
Including intraframe predictive coding frame, forward-predictive-coded frames or bi-directional predictive coding frame.
Further, described coding module, it is further used for, in the frame to described intraframe predictive coding frame
When coded macroblocks encodes, precalculate and carry out, with 8 × 8 macroblock modes, the Coding cost that encodes；From
Described input code flow obtain identical with the current inter-coded macroblocks position of described intraframe predictive coding frame
Former macroblock mode corresponding to macro block；According to described former macroblock mode and described Coding cost to described frame
The coding mode of interior coded macroblocks selects.
Further, described coding module, it is further used for, described forward-predictive-coded frames is compiled
During code, from described input code flow, obtain the current coding macro block position with described forward-predictive-coded frames
The original encoding pattern that identical macro block is corresponding；Estimation is carried out according to described original encoding pattern, thus
Obtain motion vector；According to described motion vector, described forward-predictive-coded frames is carried out motion compensation pre-
Survey coding.
Further, described coding module, it is further used for, described bi-directional predictive coding frame is compiled
During code, from described input code flow, obtain the current coding macro block position with described bi-directional predictive coding frame
The original encoding pattern that identical macro block is corresponding；Open according to described original encoding pattern and acquiescence
The coding mode of the described bi-directional predictive coding frame that B_DIRECT model selection is optimum.
The real-time transcoding method and apparatus of the fall frame per second that the present invention provides, retains during fall frame per second
Reference frame, then carries out encoding Information inheriting, it was predicted that go out the frame type of transcoding frame corresponding to present frame with
And macroblock coding information is for transcoding, it is achieved that high efficiency real-time transcoding.Alternatively, the present invention is led to
Cross coding mode and/or the motion vector of predicted macroblock, it is achieved that high-quality real-time transcoding.Alternatively,
The code-transferring method of the present invention and device keep higher video output quality while reducing the transcoding time.
By detailed description to the exemplary embodiment of the present invention referring to the drawings, its of the present invention
Its feature and advantage thereof will be made apparent from.
Accompanying drawing explanation
Combined in the description and the accompanying drawing of the part that constitutes description shows the reality of the present invention
Execute example, and together with its explanation for explaining the principle of the present invention.
Fig. 1 shows the flow chart of the real-time transcoding method of the fall frame per second that first embodiment of the invention provides.
Fig. 2 shows the flow chart of the coding information of the prediction transcoding frame that second embodiment of the invention provides.
Fig. 3 shows the flow chart of the coding information of the prediction transcoding frame that third embodiment of the invention provides.
Fig. 4 shows the flow chart of the coding information of the prediction transcoding frame that fourth embodiment of the invention provides.
Fig. 5 shows the block diagram of the real-time transcoding device of the fall frame per second that the embodiment of the present invention provides.
Fig. 6 shows the example of the hardware configuration of the live platform that can be used for realizing the embodiment of the present invention
Block diagram.
Detailed description of the invention
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should also be noted that
Unless specifically stated otherwise, the parts that illustrate the most in these embodiments and step positioned opposite,
Numerical expression and numerical value do not limit the scope of the invention.
Description only actually at least one exemplary embodiment is illustrative below, never makees
For to the present invention and application thereof or any restriction of use.
May not beg in detail for technology, method and apparatus known to person of ordinary skill in the relevant
Opinion, but in the appropriate case, described technology, method and apparatus should be considered a part for description.
Shown here with in all examples discussed, any occurrence should be construed as merely example
Property rather than as limit.Therefore, other example of exemplary embodiment can have different
Value.
It should also be noted that similar label and letter represent similar terms, therefore, one in following accompanying drawing
A certain Xiang Yi the accompanying drawing of denier is defined, then need not it is carried out further in accompanying drawing subsequently
Discuss.
The embodiment of the present invention is applied to real-time transcoding system, is particularly suited for the real-time transcoding of 4K.
Embodiment one:
With reference to shown in Fig. 1, embodiments provide a kind of real-time transcoding method dropping frame per second, bag
Include following steps:
Step 1, according to the frame per second of input code flow and the frame per second of target code stream, it is judged that in extracted at equal intervals
In the case of, whether present frame should be extracted abandons.
If step 2 present frame should be extracted and abandon and present frame is reference frame, then retain and work as
Front frame also changes into extracting first non-reference frame abandoned after present frame；If present frame should be taken out
Take and abandon and present frame is non-reference frame, then extraction abandons present frame.
The present invention still retains reference frame during reducing frame per second.Such as, if input code flow is
60 frames/second, the target code stream of transcoding is for 40 frames/second, in the case of extracted at equal intervals, it should every
Every the just extraction of 2 frames abandon 1 frame, such as extraction abandon the 3rd, 6,9 ... .57,60 frames；Assume to work as
Front frame is the 9th frame, should be extracted and abandon in the case of extracted at equal intervals, but owing to the 9th frame is
Reference frame, then retain the 9th frame, change into extracting first the non-reference frame (example abandoned after the 9th frame
If the 10th frame is non-reference frame, then change extraction into and abandon the 10th frame), if the 9th frame is non-reference
Frame, then extraction abandons the 9th frame.By step 1 and the frame dropping method of step 2, reducing frame per second
During remain reference frame.
If step 3 present frame is not extracted and abandons, then it is decoded present frame obtaining currently
Decoding frame, and during decoding, obtain frame type and the macroblock coding information of present frame, according to working as
The frame type of front frame and the frame type of transcoding frame corresponding to macroblock coding information prediction present frame and macro block
Coding information, frame type and macroblock coding information according to the transcoding frame doped are to described current decoding
Frame encodes.
The core of step 3 is, before encoding current decoded frame, obtains the former of input code flow
Coding information (includes frame type and macroblock coding information), and carries out according to described original encoding information
Coding Information inheriting, thus realize predicting coding information in order to carry out follow-up high-quality coding.
In embodiments of the invention, coding acquiescence uses H.264 video code model.Input code flow
Frame type includes intraframe predictive coding frame (I frame), forward-predictive-coded frames (P frame) and Two-way
Surveying coded frame (B frame), wherein intraframe predictive coding frame (I frame) is reference frame, forward predictive coded
Frame (P frame) and bi-directional predictive coding frame (B frame) are non-reference frame.
Data are that frame is by several portions with the least unit transmission being referred to as frame (Frame) on network
Being grouped into, different parts performs different functions.One frame is exactly a secondary static picture, continuous print
Frame is formed for animation, such as television image etc..
When actual compression, various algorithm can be taked to reduce the capacity of data, wherein IPB is exactly the most normal
See.I frame is intraframe predictive coding frame, belongs to frame data compression, and I frame picture completely retains, during decoding
Have only to these frame data just can complete.
P frame is forward predictive coded frame, belongs to interframe encode.What P frame represented is that this frame is with before
The difference of one reference frame, residual error data is weighed plus the prediction data obtained by forward motion compensation
Structure current P frame.
B frame is two-way difference frame, and namely B frame recording is the difference of this frame and RELATED APPLICATIONS frame,
Not only forward reference frame is needed but also need backward reference frame, by residual error data plus passing through anterior-posterior during decoding
The prediction data obtained to motion compensation is to reconstruct current B frame.
In one embodiment of the invention, described macroblock coding information includes being originally inputted in code stream every
The coding mode of one macro block, reference frame and motion vector, so that next code inherits these coding letters
Breath, it is achieved encode prediction efficiently.
In step 3, frame type and macroblock coding information prediction present frame according to present frame are corresponding
The frame type of transcoding frame and macroblock coding information, when using H.264 as video code model,
It is turning of the frame type that the frame type of present frame is predicted as transcoding frame corresponding to present frame, i.e. present frame
The frame type of code frame is consistent with the frame type of present frame.Described input code flow is carried out transcoding include frame
Intraprediction encoding frame, forward-predictive-coded frames and the transcoding of bi-directional predictive coding frame:
When the inter-coded macroblocks of described intraframe predictive coding frame (I frame) is encoded, count in advance
Calculation carries out the Coding cost encoded with 8 × 8 macroblock modes；Obtain and described frame from described input code flow
The former macroblock mode that the identical macro block in the current inter-coded macroblocks position of intraprediction encoding frame is corresponding；Root
According to described former macroblock mode and described Coding cost, the coding mode of described inter-coded macroblocks is selected
Select.
When described forward-predictive-coded frames (P frame) is encoded, obtain from described input code flow
The original encoding pattern that the macro block identical with the current coding macro block position of described forward-predictive-coded frames is corresponding；
Carry out estimation according to described original encoding pattern, thus obtain motion vector；Vow according to described motion
Amount carries out motion compensated predictive coding to described forward-predictive-coded frames.
When described bi-directional predictive coding frame (B frame) is encoded, obtain from described input code flow
The original encoding pattern that the macro block identical with the current coding macro block position of described bi-directional predictive coding frame is corresponding；
Optimum described two-way of the B_DIRECT model selection opened according to described original encoding pattern and acquiescence
The coding mode of encoded predicted frame.
The real-time transcoding method of the fall frame per second that the present invention provides, retains reference frame during fall frame per second,
Then carry out encoding Information inheriting, it was predicted that the frame type and the macro block that go out transcoding frame corresponding to present frame are compiled
Code information is for transcoding, it is achieved that high efficiency real-time transcoding.
Embodiment two
Fig. 2 is the techniqueflow chart of the embodiment of the present invention two, and embodiment two is in above-mentioned steps 3, right
The inter-coded macroblocks of described intraframe predictive coding frame (I frame) carries out the concrete example encoded.I frame is compiled
Code uses intra prediction mode to encode, and macroblock mode can be divided into I_16x16, I_8x8, I_4x4.
In order to ensure video quality, it will usually travel through all of coding mode and select the pattern of optimum, this nothing
Doubtful meeting increases the scramble time to a great extent.But I frame is as reference frame, so preferentially to ensure more
Good video quality.
Step 210: before encoding current macro, precalculates and enters with I_8x8 macroblock mode
The Coding cost of row coding；
Due to I_8x8 only defined in H.264-High-profile, some input code flow is also provided without this
Pattern, and I_8x8 is at I_16x16, the selection of compromise between I_4x4, so in order to preferably protect
Card video quality, during so described current coding macro block encodes, precalculates the coding of I_8x8
Cost (cost)；
Step 220: the macro block of the same position of acquisition and described current macro from described input code flow
Corresponding former macroblock mode, and compile in described frame according to described former macroblock mode and described Coding cost
The coding mode of decoding macroblock selects.
If described former macroblock mode is I_8x8, then with I_8x8 macroblock mode, described current macro is entered
Row coding；
If described former macroblock mode is 16 × 16, then with 16 × 16 macroblock modes to described current macro
Encode；
If described former macroblock mode is 4 × 4, compare the cost of I_4x4 and precalculated I_8x8,
Using cost less as real coding mode.
In the embodiment of the present invention, identical with current coding macro block position by judging in described input code flow
The coding mode of coded macroblocks, and combine to precalculate and carry out, with I_8x8 pattern, coding generation of encoding
Valency, it is achieved that the quick selection of I frame optimum code pattern, improves code efficiency and encoded video
Quality.
Embodiment three
Fig. 3 is the techniqueflow chart of the embodiment of the present invention three, and embodiment three is in above-mentioned steps 3, right
Described forward-predictive-coded frames (P frame) carries out the concrete example encoded.
Owing to P frame uses forward reference frame coding and the mixed model of intraframe coding, it is originally inputted code stream
The motion vector of correspondence position macro block has the highest utilizability, therefore, in the embodiment of the present invention, and institute
So that the MV of described input code flow (Motion Vector, i.e. motion vector) is estimated as subsequent motion
The beginning point of reference of meter.
Step 310: obtain the present encoding with described forward-predictive-coded frames from described input code flow
The original encoding pattern that macro block that macro block position is identical is corresponding；
If described original encoding pattern is inter-coded macroblocks (INTRA block), the most described present encoding is grand
Block uses the coding strategy identical with the intraframe coding module of I frame to encode.
If the macro block (P_SKIP) that described original encoding pattern is SKIP type, then judge described currently
Coded macroblocks is if appropriate for carrying out P_SKIP coding, if being suitable for, then by the volume of described current coding macro block
Pattern is labeled as P_SKIP.
If described original encoding pattern is P_16x16, the most described current coding macro block only carries out P_SKIP
With the mode decision of P_16x16, using cost minimum as last actual coding pattern.
If described original encoding pattern is P_16x8, the most described current coding macro block only carry out P_SKIP and
The mode decision of P_16x8, using cost minimum as last actual coding pattern.
If described original encoding pattern is P_8x16, the most described current coding macro block only carry out P_SKIP and
The mode decision of P_8x16, using cost minimum as last actual coding pattern.
If the coding mode of described original encoding pattern is P_8x8, the most described current coding macro block is only carried out
The mode decision of P_SKIP and P_16x16 and P_8x8.
Step 320: carry out estimation according to described original encoding pattern, thus obtain motion vector；
In inter prediction encoding, owing to the scenery in live image contiguous frames also exists certain being correlated with
Property.Therefore, live image can be divided into some pieces or macro block, and manage to search out each piece or macro block
Position in contiguous frames image, and draw the relative displacement of locus between the two, obtain
Relative displacement be exactly the motion vector of usual indication, the process obtaining motion vector is referred to as motion
Estimate.
Motion vector and the forecast error obtained after motion match are sent to solve by quantifying-converting
Code end, in the position that decoding end indicates according to motion vector, from the most decoded neighbouring reference frame image
In find corresponding block or macro block, and forecast error be added after just can reconstruct current macro.
In the embodiment of the present invention, if the macro block (P_SKIP) that described original encoding pattern is SKIP type,
With MV (0,0) as the starting point searching for candidate motion vector；
If described original encoding pattern is P_16x16, P_16x8, P_8x16 or P_8x8, work as with described
Front coded macroblocks in described input code flow the MV of the macro block of correspondence position as search candidate MV
Starting point.
Step 330: according to described motion vector, described forward-predictive-coded frames is carried out motion compensation pre-
Survey coding.
In the present embodiment, utilize and be originally inputted the motion vector of code stream correspondence position macro block to present encoding
Macro block carries out estimation, can be to reduce the scramble time in sizable degree, and can be by reality
Encoded motion search window, is limited in a smaller scope, improves estimation further
Efficiency.
Embodiment four
Fig. 4 is the techniqueflow chart of the embodiment of the present invention four, and embodiment four is in above-mentioned steps 3, right
Described bi-directional predictive coding frame (B frame) carries out the concrete example encoded:
Step 410: disabling two kinds of coding modes of B_16x8 and B_8x16 also give tacit consent to unlatching
B_DIRECT pattern；
B frame is similar to the coding of P frame, simply can support backward reference frame.So model selection is relatively
For P frame the most complicated.In the middle of reality test, the ratio shared by B_16x8 and B_8x16
Weight is less than 5%, and the code check brought saves the most extremely limited (the possible knot of the cycle tests of different content
Fruit also can be different, generally also not over 5%), so disabling B_16x8 in the middle of actual trans-coding system
With two kinds of coding modes of B_8x16 and give tacit consent to unlatching B_DIRECT pattern.
Step 420: obtain the present encoding with described bi-directional predictive coding frame from described input code flow
The original encoding pattern that macro block that macro block position is identical is corresponding, opens according to described original encoding pattern and acquiescence
The coding mode of the described bi-directional predictive coding frame that the B_DIRECT model selection opened is optimum.
If described original encoding pattern is INTRA block (inter-coded macroblocks), the most described present encoding
Macro block uses the coding strategy identical with I frame INTRA, select optimum INTRA predictive mode and
B_DIRECT pattern compares, with cost minimum, as final coding mode；
If described original encoding pattern is B_SKIP or B_DIRECT, the most described current coding macro block is only
Carry out differentiating in advance and the mode adjudging of ref0 under B_16x16, with cost of B_DIRECT pattern
Minimum, as final coding mode；
If described original encoding pattern is B_16x16, the most described current coding macro block is only carried out
Differentiating in advance and the mode adjudging of B_16x16, with the ginseng of correspondence position block of B_DIRECT pattern
Examine frame as candidate reference frame, minimum with cost, as final coding mode；
If described original encoding pattern is B_8x8, the most described current coding macro block only carries out B_DIRECT
Differentiating in advance and the mode adjudging of B_8x8, using the reference frame of correspondence position block as candidate of pattern
Reference frame, with cost minimum, as final coding mode；
In the present embodiment, by obtaining the current coding macro block position phase with described bi-directional predictive coding frame
The original encoding pattern that same macro block is corresponding, it was predicted that the coding mode of described present encoding block, turns reducing
Higher video output quality is kept while the time of code.
Corresponding with the real-time transcoding method of the fall frame per second that the embodiment of the present invention provides, the present invention implements
Example additionally provides a kind of real-time transcoding device dropping frame per second, with reference to shown in Fig. 5, and the fall frame per second of the present invention
Real-time transcoding device include frame abstraction module 101, decoder module 102 and coding module 103.
Described frame abstraction module 101, for the frame per second according to input code flow and the frame per second of target code stream,
Judging in the case of extracted at equal intervals, whether present frame should be extracted abandons；And, if worked as
Front frame should be extracted and abandon and present frame is reference frame, then retain present frame and change extraction into and abandon
First non-reference frame after present frame, if present frame should be extracted and abandon and present frame is
Non-reference frame, then extraction abandons present frame.
Described decoder module 102, in the case of present frame is not extracted and abandons, to currently
Frame is decoded obtaining current decoded frame, and obtains the frame type of present frame and grand during decoding
Block coding information.
Described coding module 103, in the case of present frame is not extracted and abandons, according to working as
The frame type of front frame and the frame type of transcoding frame corresponding to macroblock coding information prediction present frame and macro block
Coding information, frame type and macroblock coding information according to the transcoding frame doped are to described current decoding
Frame encodes.
Described input code flow uses H.264 video code model；Described coding module, for by current
The frame type of frame is as the frame type of transcoding frame corresponding to present frame, in wherein said frame type includes frame
Encoded predicted frame, forward-predictive-coded frames or bi-directional predictive coding frame.
Described coding module 103, is further used for, the intraframe coding to described intraframe predictive coding frame
When macro block encodes, precalculate and carry out, with 8 × 8 macroblock modes, the Coding cost that encodes；From described
Input code flow obtain identical with the current inter-coded macroblocks position of described intraframe predictive coding frame grand
The former macroblock mode that block is corresponding；Compile in described frame according to described former macroblock mode and described Coding cost
The coding mode of decoding macroblock selects.
Described coding module 103, is further used for, when described forward-predictive-coded frames is encoded,
Obtain identical with the current coding macro block position of described forward-predictive-coded frames from described input code flow
The original encoding pattern that macro block is corresponding；Carry out estimation according to described original encoding pattern, thus transported
Dynamic vector；According to described motion vector, described forward-predictive-coded frames is carried out motion compensated predictive coding.
Described coding module 103, is further used for, when described bi-directional predictive coding frame is encoded,
Obtain identical with the current coding macro block position of described bi-directional predictive coding frame from described input code flow
The original encoding pattern that macro block is corresponding；The B_DIRECT opened according to described original encoding pattern and acquiescence
The coding mode of the described bi-directional predictive coding frame that model selection is optimum.
Fig. 5 shown device can perform the method for Fig. 1～embodiment illustrated in fig. 4, it is achieved principle and technology
Effect, with reference to Fig. 1～embodiment illustrated in fig. 4, repeats no more.
Present invention also offers a kind of live platform, including foregoing real-time transcoding device.Fig. 6
Show the block diagram of the example of the hardware configuration of the live platform that can be used for realizing the embodiment of the present invention.
As shown in Figure 6, live platform includes calculating device 1110.Calculate device 1110 to comprise and pass through
Processing unit 1120 that system bus 1121 connects, system storage 1130, non-dismountable non-volatile
Property memory interface 1140, removable non-volatile memory interface 1150, user's input interface 1160,
Network interface 1170, video interface 1190 and output Peripheral Interface 1195.
Wherein, certain memorizer is used for storing instruction, and described instruction is used for controlling processing unit 1120
Carry out operating to perform the real-time transcoding method of the fall frame per second of the present invention.
System storage 1130 comprises ROM (read only memory) 1131 and RAM (random access memory
Memorizer) 1132.BIOS (basic input output system) 1133 resides in ROM 1131.Behaviour
Make system 1134, application program 1135, other program module 1136 and some routine datas 1137
Reside in RAM 1132.
Non-dismountable nonvolatile memory 1141 and the non-dismountable non-volatile memories of such as hard disk
Device interface 1140 connects.Such as, non-dismountable nonvolatile memory 1141 can store operating system
1144, application program 1145, other program module 1146 and some routine datas 1147.
Such as the removable non-volatile of floppy disk 1151 and CD-ROM drive 1155 is deposited
Reservoir is connected with removable non-volatile memory interface 1150.Such as, floppy disk can be inserted into floppy disk and drives
In dynamic device 1151, and, CD (CD) can be inserted in CD-ROM drive 1155.
Such as the input equipment of mouse 1161 and keyboard 1162 is connected with operation management interface 1160.
Calculate device 1110 to be connected with remote computing device 1180 by network interface 1170.Example
As, network interface 1170 can be connected with remote computing device 1180 by LAN 1171.As
Replacement scheme, network interface 1170 can be connected with modem (modulator-demodulator) 1172,
And modem 1172 is connected with remote computing device 1180 by Wide Area Network 1173.
Remote computing device 1180 can comprise the storage of the such as hard disk of storage remote application 1185
Device 1181.
Video interface 1190 is connected with monitor 1191.
Output Peripheral Interface 1195 is connected with printer 1196 and speaker 1197.
Live backstage shown in Fig. 6 is only explanatory, and never be intended to limit the present invention,
Its application or purposes.
The present invention can be system, method and/or computer program.Computer program is permissible
Including computer-readable recording medium, containing being used for making processor realize various aspects of the invention
Computer-readable program instructions.
Computer-readable recording medium can keep and store by instruction execution equipment use
The tangible device of instruction.Computer-readable recording medium such as may be-but not limited to-electricity and deposits
Storage equipment, magnetic storage apparatus, light storage device, electromagnetism storage device, semiconductor memory apparatus or
The combination of above-mentioned any appropriate.The more specifically example of computer-readable recording medium is (non exhaustive
List) including: portable computer diskette, hard disk, random access memory (RAM), read-only deposit
Reservoir (ROM), erasable type programmable read only memory (EPROM or flash memory), static random
Access memorizer (SRAM), Portable compressed dish read only memory (CD-ROM), numeral are many
Functional disc (DVD), memory stick, floppy disk, mechanical coding equipment, such as storage has instruction on it
Punch card or groove internal projection structure and the combination of above-mentioned any appropriate.Meter used herein above
Calculation machine readable storage medium storing program for executing is not construed as instantaneous signal itself, such as radio wave or other freedom
The electromagnetic wave propagated, the electromagnetic wave propagated by waveguide or other transmission mediums (such as, pass through optical fiber
The light pulse of cable) or by the signal of telecommunication of wire transfer.
Computer-readable program instructions as described herein can be downloaded from computer-readable recording medium
To each calculating/processing equipment, or by network, such as the Internet, LAN, wide area network and/
Or wireless network downloads to outer computer or External memory equipment.Network can include copper transmission cable,
Fiber-optic transfer, be wirelessly transferred, router, fire wall, switch, gateway computer and/or edge clothes
Business device.Adapter or network interface in each calculating/processing equipment receive computer from network
Readable program instructions, and forward this computer-readable program instructions, calculate for being stored in each/process
In computer-readable recording medium in equipment.
Can be assembly instruction, instruction set architecture for performing the computer program instructions of present invention operation
(ISA) instruction, machine instruction, machine-dependent instructions, microcode, firmware instructions, state arrange number
According to or the source code write with the combination in any of one or more programming languages or object code, institute
State programming language and include OO programming language such as Smalltalk, C++ etc., and conventional
Procedural programming languages such as " C " language or similar programming language.Computer-readable program instructions
Can perform the most on the user computer, perform the most on the user computer, as one
Independent software kit performs, part part the most on the user computer performs the most on the remote computer or
Perform on remote computer or server completely.In the situation relating to remote computer, remotely count
By the network of any kind, calculation machine can include that LAN (LAN) or wide area network (WAN) connect
To subscriber computer, or, it may be connected to outer computer (such as utilizes Internet service to provide
Business passes through Internet connection).In certain embodiments, by utilizing computer-readable program instructions
Status information come personalized customization electronic circuit, such as Programmable Logic Device, field programmable gate
Array (FPGA) or programmable logic array (PLA), this electronic circuit can perform computer can
Reader instructs, thus realizes various aspects of the invention.
Referring herein to method according to embodiments of the present invention, device (system) and computer program
Flow chart and/or block diagram describe various aspects of the invention.Should be appreciated that flow chart and/or block diagram
Each square frame and flow chart and/or block diagram in the combination of each square frame, can be by computer-readable journey
Sequence instruction realizes.
These computer-readable program instructions can be supplied to general purpose computer, special-purpose computer or other
The processor of programmable data processing means, thus produce a kind of machine so that these instructions are logical
When crossing the processor execution of computer or other programmable data processing means, create flowchart
And/or the device of the function/action of regulation in the one or more square frames in block diagram.These can also be counted
Calculation machine readable program instructions store in a computer-readable storage medium, these instruction make computer,
Programmable data processing means and/or other equipment work in a specific way, thus, storage has instruction
Computer-readable medium then includes a manufacture, and it includes one in flowchart and/or block diagram
Or the instruction of the various aspects of the function/action of regulation in multiple square frame.
Computer-readable program instructions can also be loaded into computer, other programmable data processes dress
Put or on miscellaneous equipment so that at computer, other programmable data processing means or miscellaneous equipment
Upper execution sequence of operations step, to produce computer implemented process so that computer,
The instruction flowchart performed in other programmable data processing means or miscellaneous equipment and/or block diagram
In one or more square frames in regulation function/action.
Flow chart and block diagram in accompanying drawing show the system of multiple embodiments according to the present invention, method
Architectural framework in the cards, function and operation with computer program.In this, flow process
Each square frame in figure or block diagram can represent a module, program segment or a part for instruction, described
A part for module, program segment or instruction comprises one or more logic function for realizing regulation
Executable instruction.At some as in the realization replaced, the function marked in square frame can also be with not
The order being same as being marked in accompanying drawing occurs.Such as, two continuous print square frames can essentially the most also
Performing, they can also perform sometimes in the opposite order capablely, and this is depending on involved function.
It is also noted that in each square frame in block diagram and/or flow chart and block diagram and/or flow chart
The combination of square frame, can come real by the special hardware based system of the function or action that perform regulation
Existing, or can realize with the combination of specialized hardware with computer instruction.For people in the art
It is well known that for Yuan, realized by hardware mode, realized by software mode and by software and
The mode of combination of hardware realizes being all of equal value.
Being described above various embodiments of the present invention, described above is exemplary, and exhaustive
Property, and it is also not necessarily limited to disclosed each embodiment.At the model without departing from illustrated each embodiment
Enclose with spirit in the case of, many modifications and changes for those skilled in the art
Will be apparent from.The selection of term used herein, it is intended to explain the former of each embodiment best
Reason, actual application or the technological improvement to the technology in market, or make other of the art general
Logical technical staff is understood that each embodiment disclosed herein.The scope of the present invention is come by claims
Limit.
Being described above various embodiments of the present invention, described above is exemplary, and exhaustive
Property, and it is also not necessarily limited to disclosed each embodiment.At the model without departing from illustrated each embodiment
Enclose with spirit in the case of, many modifications and changes for those skilled in the art
Will be apparent from.The selection of term used herein, it is intended to explain the former of each embodiment best
Reason, actual application or the technological improvement to the technology in market, or make other of the art general
Logical technical staff is understood that each embodiment disclosed herein.The scope of the present invention is come by claims
Limit.
Claims (10)
1. the real-time transcoding method dropping frame per second, it is characterised in that comprise the following steps:
Frame per second according to input code flow and the frame per second of target code stream, it is judged that in the case of extracted at equal intervals,
Whether present frame should be extracted abandons；
If present frame should be extracted and abandon and present frame is reference frame, then retain present frame and change
First non-reference frame after present frame is abandoned for extraction；If present frame should be extracted and abandon also
And present frame is non-reference frame, then extraction abandons present frame；
If present frame is not extracted and abandons, then it is decoded present frame obtaining current decoded frame,
And during decoding, obtain frame type and the macroblock coding information of present frame, according to the frame of present frame
Type and the frame type of transcoding frame corresponding to macroblock coding information prediction present frame and macroblock coding information,
Described current decoded frame is encoded by frame type and macroblock coding information according to the transcoding frame doped.
Method the most according to claim 1, it is characterised in that H.264 described input code flow uses
Video code model；Using the frame type of present frame as the frame type of transcoding frame corresponding to present frame, its
Described in frame type include intraframe predictive coding frame, forward-predictive-coded frames or bi-directional predictive coding frame.
Method the most according to claim 2, it is characterised in that to described intraframe predictive coding
When the inter-coded macroblocks of frame encodes, precalculate and carry out, with 8 × 8 macroblock modes, the coding that encodes
Cost；
The current inter-coded macroblocks with described intraframe predictive coding frame is obtained from described input code flow
The former macroblock mode that the identical macro block in position is corresponding；
The coding mould to described inter-coded macroblocks according to described former macroblock mode and described Coding cost
Formula selects.
Method the most according to claim 2, it is characterised in that to described forward predictive coded
When frame encodes, from described input code flow, obtain the present encoding with described forward-predictive-coded frames
The original encoding pattern that macro block that macro block position is identical is corresponding；
Carry out estimation according to described original encoding pattern, thus obtain motion vector；
According to described motion vector, described forward-predictive-coded frames is carried out motion compensated predictive coding.
Method the most according to claim 2, it is characterised in that to described bi-directional predictive coding
When frame encodes, from described input code flow, obtain the present encoding with described bi-directional predictive coding frame
The original encoding pattern that macro block that macro block position is identical is corresponding；
Institute according to the B_DIRECT model selection optimum that described original encoding pattern and acquiescence are opened
State the coding mode of bi-directional predictive coding frame.
6. the real-time transcoding device dropping frame per second, it is characterised in that include frame abstraction module, solution
Code module and coding module；
Described frame abstraction module, for the frame per second according to input code flow and the frame per second of target code stream, it is judged that
In the case of extracted at equal intervals, whether present frame should be extracted abandons；And, if present frame
Should be extracted and abandon and present frame is reference frame, then retain present frame and change extraction into and abandon currently
First non-reference frame after frame, if present frame should be extracted and abandon and present frame is non-ginseng
Examine frame, then extraction abandons present frame；
Described decoder module, in the case of present frame is not extracted and abandons, enters present frame
Row decoding obtains current decoded frame, and obtains frame type and the macro block volume of present frame during decoding
Code information；
Described coding module, in the case of present frame is not extracted and abandons, according to present frame
Frame type and the frame type of transcoding frame corresponding to macroblock coding information prediction present frame and macroblock coding
Information, described current decoded frame is entered by frame type and macroblock coding information according to the transcoding frame doped
Row coding.
Device the most according to claim 6, it is characterised in that H.264 described input code flow uses
Video code model；Described coding module, for using corresponding as present frame for the frame type of present frame
The frame type of transcoding frame, wherein said frame type includes intraframe predictive coding frame, forward-predictive-coded frames
Or bi-directional predictive coding frame.
Device the most according to claim 7, it is characterised in that described coding module, enters one
Step is used for, when the inter-coded macroblocks of described intraframe predictive coding frame is encoded, precalculate with
8 × 8 macroblock modes carry out the Coding cost encoded；
The current inter-coded macroblocks with described intraframe predictive coding frame is obtained from described input code flow
The former macroblock mode that the identical macro block in position is corresponding；
The coding mould to described inter-coded macroblocks according to described former macroblock mode and described Coding cost
Formula selects.
Device the most according to claim 7, it is characterised in that described coding module, enters one
Step is used for, and when encoding described forward-predictive-coded frames, obtains and institute from described input code flow
State the original encoding pattern that the identical macro block in the current coding macro block position of forward-predictive-coded frames is corresponding；
Carry out estimation according to described original encoding pattern, thus obtain motion vector；
According to described motion vector, described forward-predictive-coded frames is carried out motion compensated predictive coding.
Device the most according to claim 7, it is characterised in that described coding module, enters one
Step is used for, and when encoding described bi-directional predictive coding frame, obtains and institute from described input code flow
State the original encoding pattern that the identical macro block in the current coding macro block position of bi-directional predictive coding frame is corresponding；
Institute according to the B_DIRECT model selection optimum that described original encoding pattern and acquiescence are opened
State the coding mode of bi-directional predictive coding frame.
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