CN102724502B - The control method of code check and device in a kind of Video coding - Google Patents
The control method of code check and device in a kind of Video coding Download PDFInfo
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Abstract
The embodiment of the present invention provides control method and the device of code check in a kind of Video coding, relates to technical field of video coding, and the instantaneous code check exported in order to control Video coding is no more than the limit bit rate of setting, prevents network congestion or packet loss; Described method comprises, and arranges the position of the first sliding window, makes present frame be positioned at the N frame of described first sliding window; If the compressed bit stream bit number sum of all frames is greater than default limit bit rate in the first sliding window, do not export present frame; Wherein, the size of described first sliding window equals default frame per second N.The embodiment of the present invention is used for Video coding.
Description
Technical field
The present invention relates to technical field of video coding, particularly relate to control method and the device of code check in a kind of Video coding.
Background technology
In video communication applications, need to carry out compressed encoding to video image for the ease of the transmission of video data and storage.Because video image is time dependent, the compressed bit stream bit number exported through compressed encoding also can change in time.The code check that the code stream bit number sum presentation code exported with compressed encoding in the unit interval exports, then Video coding bit rate output can fluctuate within the specific limits.Because the bandwidth on network or storage media capacity are limited, this carries out Rate Control with regard to needs in video compression coding process, the code check that coding side is exported is no more than the network bandwidth of setting or the upper limit of storage media capacity, prevents packet loss phenomenon.
Existing rate control algorithm mostly adopts VBV (virtual buffer verification, video cache verifier) to carry out control coding and exports bit number.In VBV, encoder has a virtual bit stream buffer district when encoding, be designated as buffer.Encoder, when encoding each frame, first calculates the target bit of frame to be encoded, calculates quantization parameter (QP value) according to target bit, the bit number regulating every frame to export by QP value.When the code stream in buffer soon underflow time, encoder is that this frame produces more bit number; When the code stream in buffer soon overflow time, encoder is that this frame produces less bit number, or frame-skipping.Like this, the code stream in buffer just at the uniform velocity can export according to the code check of setting.
But there will be the situation that image complexity to be encoded increases suddenly in real-time video signal application, the instantaneous code check that encoder exports likely exceedes the network bandwidth upper limit of setting, and pseudo code streambuf still shows not overflow also not underflow.Such as: after encoder continuous programming code exports the low rest image of some frame complexities, in pseudo code streambuf, remaining bits number is little, now, if image to be encoded becomes suddenly very complicated, in order to ensure picture quality, encoder must export larger bit stream continuously, and the full scale of pseudo code streambuf will increase sharply.Now, the code stream deposited in pseudo code streambuf may for the nearest compressed bit stream less than 1 second, code stream bit number sum in pseudo code streambuf obviously can not represent that coding now exports instantaneous code check, therefore, judge whether bit rate output exceedes the method for capping by the code stream bit number sum of pseudo code streambuf, cannot guarantee that the code check of any time coding output is no more than the upper limit of setting, network congestion or packet loss may be caused, the picture quality that impact decoding exports and playing fluency, reduce the subjective feeling of video real time communication.
Summary of the invention
Embodiments of the invention provide control method and the device of code check in a kind of Video coding.The instantaneous code check exported in order to control Video coding is no more than the limit bit rate of setting, prevents network congestion or packet loss.
For achieving the above object, embodiments of the invention adopt following technical scheme:
Embodiments of the invention provide control method and the device of code check in a kind of Video coding.The instantaneous code check exported in order to control Video coding is no more than the limit bit rate of setting, prevents network congestion or packet loss.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, the control method of code check in a kind of Video coding is provided, comprises,
The position of the first sliding window is set, makes present frame be positioned at the N frame of described first sliding window;
If the compressed bit stream bit number sum of all frames is greater than default limit bit rate in the first sliding window, do not export present frame; Wherein, the size of described first sliding window equals default frame per second N.
On the one hand, the control device of code check in a kind of Video coding is provided, comprises,
Sliding window arranges module, for arranging the position of the first sliding window, makes present frame be positioned at the N frame of described first sliding window;
Export judge module, exporting present frame for judging whether, if the compressed bit stream bit number sum of all frames is greater than default limit bit rate in the first sliding window, not exporting present frame;
Wherein, the size of described first sliding window equals default frame per second N.
The control method of code check and device in the Video coding that the embodiment of the present invention provides, adopt the sliding window preset, and the size of sliding window is set to the frame per second preset, like this, the instantaneous code check that encoder exports just equals the compressed bit stream bit number sum of all coding output frames in interior sliding window per second.Encoder, when exporting every frame, if the compressed bit stream bit number sum of all coding output frames is greater than default limit bit rate in sliding window, shows that the instantaneous code check that encoder exports is greater than default limit bit rate, does not then export present frame.Thus the instantaneous code check controlling Video coding output is no more than the limit bit rate of setting, prevents network congestion or packet loss.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of the control method of code check in the Video coding that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of first, second sliding window that Fig. 2 provides for the embodiment of the present invention;
The flow chart of the control method of code check in the Video coding that Fig. 3 provides for another embodiment of the present invention;
The structural representation of the control device of code check in the Video coding that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In the embodiment of the present invention, in video encoder, arrange sliding window, the size N of sliding window equals default frame per second.Wherein, this frame per second preset can be determined the condition such as smooth new demand, network availability bandwidth of image according to user.Such as, when the frame per second preset is 30, coding output 30 two field picture per second is represented, then the size N=30 of sliding window.The code check exported due to coding is the code stream bit number sum that in the unit interval, compressed encoding exports.Like this, in the unit interval, in namely per second, the compressed bit stream bit number sum of all coding output frames in sliding window equals the instantaneous code check that now encoder exports.Encoder, when encoding, exporting each frame, by controlling the bit number of all coding output frames in active window, can guarantee that instantaneous code check that Video coding exports is no more than the limit bit rate of setting.
In the Video coding that the embodiment of the present invention provides, the control method of code check, as shown in Figure 1, comprises,
101, the position of the first sliding window is set, makes present frame be positioned at the N frame of described first sliding window.
Wherein, present frame refers to that encoder carries out encoding, that frame of output processing.As shown in Figure 2.The size of the first sliding window equals frame per second N, and present frame is the N frame of the first sliding window.Now, encoder has been encoded 1 to the N-1 frame in output first sliding window, and completes the coding of N frame by output N frame.
If the compressed bit stream bit number sum of all frames is greater than default limit bit rate in 202 first sliding windows, do not export present frame.
Calculate the compressed bit stream bit number sum of all frames in the first sliding window, when satisfying condition,
Encoder does not export present frame N, namely abandons present frame.Wherein, L
nfor the bit number of current encoded frame; L
iit is the compressed bit stream bit number of the i-th frame encoded in the first sliding window; Maxbitrate is default limit bit rate, can be specifically the default network bandwidth upper limit, or according to the limit bit rate that the capacity conversion of storage media (as hard disk, CD etc.) obtains; N is the size of the first sliding window, the frame per second namely preset.
The control method of code check in the Video coding that the embodiment of the present invention provides, default frame per second is set to the size of active window, like this, the instantaneous code check that encoder exports just equals the compressed bit stream bit number sum of all coding output frames in interior sliding window per second.Encoder, when exporting every frame, if the compressed bit stream bit number sum in sliding window is greater than default limit bit rate, shows that the instantaneous code check that encoder exports is greater than default limit bit rate, does not then export present frame.Thus the instantaneous code check controlling Video coding output is no more than the limit bit rate of setting, prevents network congestion or packet loss.
In the another kind of Video coding that the embodiment of the present invention provides, the control method of code check, as shown in Figure 3, comprises,
301, the position of the first sliding window is set, makes present frame be positioned at the N frame of the first sliding window.
Wherein, present frame refers to that encoder carries out encoding, that frame of output processing.As shown in Figure 2.The size of the first sliding window equals frame per second N, and present frame is the N frame of the first sliding window.Now, 1 to the N-1 frame that encoder has been encoded in output first sliding window is about to start N frame of encoding.
302, present frame of encoding is judged whether.
Calculate the target bit upper limit sum that the 1st frame in the first sliding window to compressed bit stream bit number sum and the N frame of N-1 frame is preset.
If the target bit sum that the 1st frame in the first sliding window is preset to N-1 frame compressed bit stream bit number sum and N frame is greater than default limit bit rate, present frame of not encoding.Namely
Encoder is not encoded N frame.Wherein, L
iit is the compressed bit stream bit number of the i-th frame encoded in the first sliding window; Maxbitrate is the limit bit rate of setting, can be specifically the default network bandwidth upper limit, or according to the limit bit rate that the capacity conversion of storage media (as hard disk, CD etc.) obtains; N is the size of the first sliding window, and (bitrate/N) represents the target bit of N frame in the first sliding window, and this value can calculate according to the target bit rate bitrate of the encoder arranged.
If the target bit sum that the 1st frame in the first sliding window is preset to N-1 frame compressed bit stream bit number sum and N frame is not more than default limit bit rate, coding present frame, namely
Encoder encodes N frame.
In this step, if determine not encode present frame, then skip present frame, step terminates.Next frame is processed.If determine present frame of encoding, after coding completes, enter step 303.
303, the position of the second sliding window is set, makes present frame be positioned at N-(M-1) frame of described second sliding window.
Wherein, present frame refers to that encoder carries out encoding, that frame of output processing.As shown in Figure 2.The size of the second sliding window equals frame per second N, and present frame is N-(M-1) frame of the second sliding window.Now, encoder has been encoded 1 to the N-M frame in output second sliding window, and encoder is about to start N-(M-1) frame of encoding.
304, according to the 1st frame in the second sliding window to the target bit upper limit of the compressed bit stream bit number sum determination present frame of N-M frame.
Calculate the second encoder by according to the 1st frame in sliding window to the compressed code of N-M frame
Wherein, T
n-(M-1)for being about to the present frame target bit upper limit of coding; Maxbitrate is default limit bit rate, can be specifically the default network bandwidth upper limit, or according to the limit bit rate that the capacity conversion of storage media (as hard disk, CD etc.) obtains; L
iit is the compressed bit stream bit number of the i-th frame encoded in the second sliding window; N is the size of the second sliding window; (M-1) * (bitrate/N) represents in the second sliding window the goal-selling bit number sum amounting to (M-1) frame after being positioned at present frame; (bitrate/N) represent the target bit of N frame in the second sliding window, this value can calculate according to the target bit rate bitrate of the encoder arranged.M is greater than 1 and is less than N.Preferably, M is 3 or 4.
Like this, encoder is before coding present frame, the second sliding window can be used to calculate the target bit upper limit of present frame, when the compressed bit stream bit number of 1 to the N-M frame if encoded in output second sliding window is larger, the present frame target bit upper limit can be controlled in advance, prevent continuous frame-skipping, improve the image fluency that encoder exports.
Then, encoder is according to the target bit upper limit T of present frame
n-(M-1)the target bit of adjustment present frame, then calculate QP value according to the target bit of present frame, present frame is encoded.
305, the position of the first sliding window is set, makes present frame be positioned at the N frame of described first sliding window.
Step 305 is from the different of step 301, and when carrying out step 305, encoder has been encoded 1 to the N-1 frame in output first sliding window, and completes the coding of N frame by output N frame.
306, judge whether to export present frame.
Calculate the compressed bit stream bit number sum of all frames in the first sliding window.
If the compressed bit stream bit number sum of all frames is greater than default code in the first sliding window
Encoder does not export present frame N, namely abandons present frame.Wherein, L
nfor the bit number of current encoded frame; L
iit is the compressed bit stream bit number of the i-th frame encoded in the first sliding window; Maxbitrate is default limit bit rate, can be specifically the default network bandwidth upper limit, or according to the limit bit rate that the capacity conversion of storage media (as hard disk, CD etc.) obtains; N is the size of the first sliding window, the frame per second namely preset.
If the compressed bit stream bit number sum of all frames is not more than default in the first sliding window
Encoder exports present frame N.Wherein, L
nfor the bit number of current encoded frame; L
iit is the compressed bit stream bit number of the i-th frame encoded in the first sliding window; Maxbitrate is default limit bit rate, can be specifically the default network bandwidth upper limit, or according to the limit bit rate that the capacity conversion of storage media (as hard disk, CD etc.) obtains; N is the size of the first sliding window, the frame per second namely preset.
It should be noted that, for present frame, step 301 ~ 302 and step 303 ~ 304 can be carried out simultaneously, and step 303 ~ 304 also can be carried out before step 301 ~ 302, also can only carry out step 301 ~ and 302, or only carry out step 303 ~ 304.Be understandable that, above distortion and other distortion can done according to thinking of the present invention, all should include protection scope of the present invention in.
As shown in Figure 4, the embodiment of the present invention also provides the control device 4 of code check in a kind of Video coding, comprises,
Sliding window arranges module 41, for arranging the position of the first sliding window, makes present frame be positioned at the N frame of described first sliding window.
Export judge module 42, exporting present frame for judging whether, if the compressed bit stream bit number sum of all frames is greater than default limit bit rate in the first sliding window, not exporting present frame.
Wherein, the size of described first sliding window equals default frame per second N.
Further, device 4 also comprises,
Coding judge module 43, for judging whether present frame of encoding, if the target bit sum that in the first sliding window, the 1st frame to compressed bit stream bit number sum and the N frame of N-1 frame is preset is greater than default limit bit rate, present frame of not encoding.
Wherein, the size of described first sliding window equals default frame per second N.
Further, sliding window setting unit 41, also for arranging the position of the second sliding window, makes described present frame be positioned at N-(M-1) frame of described second sliding window;
Described device 4 also comprises,
Determination module 44, for according to the 1st frame in the second sliding window to the target bit upper limit of the compressed bit stream bit number sum determination present frame of N-M frame;
Wherein, the size of described second sliding window equals default frame per second N.
In Video coding shown in Fig. 4, the control device of code check can perform the step in said method embodiment, and each function of Method Of Accomplishment embodiment, realizes the control method of code check in Video coding by the description of embodiment of the method in its application process.
Exemplary, in the Video coding shown in Fig. 4, the control device of code check can be encoder.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (6)
1. the control method of code check in Video coding, is characterized in that, comprising:
The position of the second sliding window is set, makes present frame be positioned at N-(M-1) frame of described second sliding window;
The target bit upper limit of described present frame is determined according to the 1st frame in described second sliding window to the compressed bit stream bit number sum of N-M frame; Wherein, the size of described second sliding window equals default frame per second N;
The position of the first sliding window is set, makes described present frame be positioned at the N frame of described first sliding window;
After to described present frame coding, if the compressed bit stream bit number sum of all frames is greater than default limit bit rate in the first sliding window, then do not export present frame; Wherein, the size of described first sliding window equals default frame per second N.
2. method according to claim 1, it is characterized in that, also comprise between described " position of the first sliding window is set; make present frame be positioned at the N frame of described first sliding window " Yu described " if the compressed bit stream bit number sum of the first sliding window is greater than default limit bit rate, not exporting present frame ":
If the target bit sum that in the first sliding window, the 1st frame to compressed bit stream bit number sum and the N frame of N-1 frame is preset is greater than default limit bit rate, present frame of not encoding, the treatment step of present frame terminates;
If the target bit sum that in the first sliding window, the 1st frame to compressed bit stream bit number sum and the N frame of N-1 frame is preset is not more than default limit bit rate, coding present frame.
3. method according to claim 1, is characterized in that, the target bit upper limit of described present frame is,
Wherein, T
n-(M-1)for the present frame target bit upper limit; Maxbitrate is default limit bit rate; L
iit is the compressed bit stream bit number of the i-th frame encoded in the second sliding window; N is the size of the second sliding window; (M-1) * (bitrate/N) represents in the second sliding window the goal-selling bit number sum amounting to (M-1) frame after being positioned at present frame.
4. method according to claim 3, is characterized in that, described M value is 3 or 4.
5. the control device of code check in Video coding, is characterized in that, comprise,
Sliding window setting unit, for arranging the position of the second sliding window, makes present frame be positioned at N-(M-1) frame of described second sliding window;
Determination module, for determining the target bit upper limit of described present frame according to the 1st frame in described second sliding window to the compressed bit stream bit number sum of N-M frame; Wherein, the size of described second sliding window equals default frame per second N;
Described sliding window arranges module, also for arranging the position of the first sliding window, makes present frame be positioned at the N frame of described first sliding window;
Export judge module, for after encoding to described present frame, judge whether to export present frame, if the compressed bit stream bit number sum of all frames is greater than default limit bit rate in the first sliding window, do not export present frame;
Wherein, the size of described first sliding window equals default frame per second N.
6. device according to claim 5, is characterized in that, also comprises,
Coding judge module, for judging whether present frame of encoding, if the target bit upper limit sum that in the first sliding window, the 1st frame to compressed bit stream bit number sum and the N frame of N-1 frame is preset is greater than default limit bit rate, present frame of not encoding;
Wherein, the size of described first sliding window equals default frame per second N.
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| JP6391694B2 (en) * | 2015-07-31 | 2018-09-19 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドＳｚ Ｄｊｉ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ | Video encoding method and system |
| CN106572351B (en) * | 2015-10-13 | 2019-11-15 | 腾讯科技（北京）有限公司 | Bit rate control method and device, electronic equipment and computer readable storage medium in Video coding |
| CN106851337B (en) * | 2017-02-21 | 2019-12-24 | 聚好看科技股份有限公司 | Video buffering control method and device |
| CN106937115A (en) * | 2017-03-02 | 2017-07-07 | 杭州当虹科技有限公司 | The method for carrying out bit number training to bit number fallout predictor in Video coding |
| CN107493478B (en) * | 2017-09-01 | 2020-04-14 | 广州市百果园网络科技有限公司 | Method and device for setting coding frame rate |
| CN109862359B (en) * | 2018-12-29 | 2021-01-08 | 北京数码视讯软件技术发展有限公司 | Code rate control method and device based on layered B frame and electronic equipment |
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