CN102724502A - Method and device for controlling bitrate in video coding - Google Patents
Method and device for controlling bitrate in video coding Download PDFInfo
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Abstract
An embodiment of the invention provides a method and a device for controlling bitrate in video coding and relates to the technical field of video coding. The method and the device are used for controlling instantaneous bitrate outputted by video coding not to exceed set maxbitrate and preventing network congestion or packet loss. The method includes: setting the position of a first slide window to enable a current frame to be positioned on a Nth frame of the first slide window; and if compressed code stream bitrate sum of all frames in the first slide window is larger than the preset maxbitrate, not outputting the current frame, wherein the size of the first slide window is equal to preset frame frequency N. The method and the device in the embodiment are used for video coding.
Description
Technical field
The present invention relates to technical field of video coding, relate in particular to the control method and the device of code check in a kind of video coding.
Background technology
In video communication applications, need carry out compressed encoding to video image for the ease of the transmission and the storage of video data.Because video image is time dependent, the compressed bit stream bit number of exporting through compressed encoding also can change in time.With the code check that the code stream bit number sum presentation code of compressed encoding output in the unit interval is exported, then the video coding bit rate output can fluctuate within the specific limits.Because bandwidth or storage media capacity on the network are limited; This just need carry out Rate Control in the video compression coding process; The code check that coding side is exported is no more than the upper limit of the network bandwidth or the storage media capacity of setting, prevents the packet loss phenomenon.
Existing rate control algorithm adopts VBV (virtual buffer verification, video cache verifier) to control coding output bit number mostly.In VBV, encoder has a virtual bit stream buffer district when coding, be designated as buffer.Encoder at first calculates the target bit of frame to be encoded when each frame of coding, calculate quantization parameter (QP value) according to target bit, regulates the bit number of every frame output through the QP value.When the code stream among the buffer soon during underflow, encoder is that this frame produces more bit number; When the code stream among the buffer soon during overflow, encoder is that this frame produces less bit number, perhaps frame-skipping.Like this, the code stream among the buffer just can at the uniform velocity be exported according to the code check of setting.
But, the situation that image complexity to be encoded increases suddenly can appear in real-time video signal is used, and the instantaneous code check of encoder output might surpass the network bandwidth upper limit of setting, and the pseudo code streambuf still shows not also underflow not of overflow.For example: after the encoder continuous programming code is exported the low rest image of some frame complexities; The remaining bits number seldom in the pseudo code streambuf; At this moment, very complicated if image to be encoded becomes suddenly, in order to ensure picture quality; Encoder is the bigger bit stream of output continuously, and the full scale of pseudo code streambuf will increase sharply.At this moment; The code stream of depositing in the pseudo code streambuf possibly be the nearest less than compressed bit stream in 1 second; Code stream bit number sum in the pseudo code streambuf can not represent that obviously the coding of this moment exports instantaneous code check, therefore, judges that through the code stream bit number sum of pseudo code streambuf whether bit rate output surpasses the method for capping; Can't guarantee that the code check of any time coding output is no more than the upper limit of setting; Possibly cause network congestion or packet loss, the picture quality and the playing fluency of influence decoding output reduce the subjective feeling that real-time video is communicated by letter.
Summary of the invention
Embodiments of the invention provide the control method and the device of code check in a kind of video coding.Be no more than the limit bit rate of setting in order to the instantaneous code check of control of video coding output, prevent network congestion or packet loss.
For achieving the above object, embodiments of the invention adopt following technical scheme:
Embodiments of the invention provide the control method and the device of code check in a kind of video coding.Be no more than the limit bit rate of setting in order to the instantaneous code check of control of video coding output, prevent 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 first sliding window is set, makes present frame be positioned at the N frame of said first sliding window;
If the compressed bit stream bit number sum of all frames is not exported present frame greater than preset limit bit rate in first sliding window; Wherein, the size of said first sliding window frame per second N that equals to preset.
On the one hand, the control device of code check in a kind of video coding is provided, comprises,
Sliding window is provided with module, is used to be provided with the position of first sliding window, makes present frame be positioned at the N frame of said first sliding window;
The output judge module is used to judge whether to export present frame, if the compressed bit stream bit number sum of all frames is not exported present frame greater than preset limit bit rate in first sliding window;
Wherein, the size of said first sliding window frame per second N that equals to preset.
The control method of code check and device in the video coding that the embodiment of the invention provides; Adopt preset sliding window; And the size of the sliding window frame per second that is set to preset; Like this, the instantaneous code check of encoder output just equals the compressed bit stream bit number sum of the coding of all in sliding window output frame in the per second.Encoder is when the every frame of output, if the compressed bit stream bit number sum of all coding output frames is greater than preset limit bit rate in the sliding window, the instantaneous code check that shows encoder output is not then exported present frame greater than preset limit bit rate.Thereby the instantaneous code check of control of video coding output is no more than the limit bit rate of setting, prevents network congestion or packet loss.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing 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 invention;
The sketch map of first, second sliding window that Fig. 2 provides for the embodiment of the 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 invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
In the embodiment of the invention, sliding window is set in video encoder, the frame per second that the big or small N of sliding window equals to preset.Wherein, this preset frame per second can be confirmed conditions such as the smooth new demand of image, network availability bandwidths according to the user.For example, preset frame per second is 30 o'clock, the output of expression per second coding 30 two field pictures, the then big or small N=30 of sliding window.Because the code check of coding output is the code stream bit number sum of compressed encoding output in the unit interval.Like this, in the unit interval, promptly in the per second, the compressed bit stream bit number sum of all the coding output frames in the sliding window equals the instantaneous code check of encoder output this moment.Encoder through the bit number of all the coding output frames in the control active window, can guarantee that the instantaneous code check of video coding output is no more than the limit bit rate of setting at coding, when exporting each frame.
The control method of code check is as shown in Figure 1 in the video coding that the embodiment of the invention provides, comprise,
101, the position of first sliding window is set, makes present frame be positioned at the N frame of said first sliding window.
Wherein, present frame is meant that encoder encodes, exports that frame of processing.As shown in Figure 2.The size of first sliding window equals frame per second N, and present frame is the N frame of first sliding window.At this moment, encoder has been encoded and has been exported the 1st to N-1 frame in first sliding window, and the coding of accomplishing the N frame is about to export the N frame.
202, if the compressed bit stream bit number sum of all frames is not exported present frame greater than preset limit bit rate in first sliding window.
Calculate the compressed bit stream bit number sum of all frames in first sliding window, when satisfying condition,
Encoder is not exported present frame N, promptly abandons present frame.Wherein, L
NBit number for current encoded frame; L
iIt is the compressed bit stream bit number of the i frame of having encoded in first sliding window; Maxbitrate specifically can be the network bandwidth upper limit of presetting for preset limit bit rate, the limit bit rate that perhaps obtains according to the capacity conversion of storage media (like hard disk, CD etc.); N is the size of first sliding window, promptly preset frame per second.
The control method of code check in the video coding that the embodiment of the invention provides; Preset frame per second is set to the size of active window; Like this, the instantaneous code check of encoder output just equals the compressed bit stream bit number sum of the coding of all in sliding window output frame in the per second.Encoder greater than preset limit bit rate, is not then exported present frame if the compressed bit stream bit number sum in the sliding window, shows the instantaneous code check of encoder output greater than preset limit bit rate when the every frame of output.Thereby the instantaneous code check of control of video coding output is no more than the limit bit rate of setting, prevents network congestion or packet loss.
The control method of code check is as shown in Figure 3 in the another kind of video coding that the embodiment of the invention provides, comprise,
301, the position of first sliding window is set, makes present frame be positioned at the N frame of first sliding window.
Wherein, present frame is meant that encoder encodes, exports that frame of processing.As shown in Figure 2.The size of first sliding window equals frame per second N, and present frame is the N frame of first sliding window.At this moment, encoder 1st to the N-1 frame of output in first sliding window of having encoded is about to begin the N frame of encoding.
302, judge whether the present frame of encoding.
Calculate the compressed bit stream bit number sum and the preset target bit upper limit sum of N frame of the 1st frame to the N-1 frame in first sliding window.
If the target bit sum that the 1st frame to the N-1 frame compressed bit stream bit number sum in first sliding window and N frame are preset is greater than preset limit bit rate, the present frame of not encoding.I.e.
The encoder N frame of not encoding.Wherein, L
iIt is the compressed bit stream bit number of the i frame of having encoded in first sliding window; The limit bit rate of maxbitrate for setting specifically can be the network bandwidth upper limit of presetting, the limit bit rate that perhaps obtains according to the capacity conversion of storage media (like hard disk, CD etc.); N is the size of first sliding window, (bitrate/N) target bit of N frame in expression first sliding window, and this value can calculate according to the target bit rate bitrate of the encoder that is provided with.
If the preset target bit sum of the 1st frame to the N-1 frame compressed bit stream bit number sum in first sliding window and N frame is not more than preset limit bit rate; Coding present frame, i.e.
Encoder encodes N frame.
In this step, if confirm not encode present frame, then skip present frame, step finishes.Next frame is handled.If confirm the coding present frame, after coding is accomplished, get into step 303.
303, the position of second sliding window is set, makes present frame be positioned at N-(M-1) frame of said second sliding window.
Wherein, present frame is meant that encoder encodes, exports that frame of processing.As shown in Figure 2.The size of second sliding window equals frame per second N, and present frame is N-(M-1) frame of second sliding window.At this moment, encoder has been encoded and has been exported the 1st to N-M frame in second sliding window, and encoder is about to begin to encode N-(M-1) frame.
304, confirm the target bit upper limit of present frame according to the compressed bit stream bit number sum of the 1st frame to the N-M frame in second sliding window.
Calculating second encoder will be according to the compressed code
of the 1st frame to the N-M frame in the sliding window
Wherein, T
N-(M-1)For being about to the present frame target bit upper limit of coding; Maxbitrate specifically can be the network bandwidth upper limit of presetting for preset limit bit rate, the limit bit rate that perhaps obtains according to the capacity conversion of storage media (like hard disk, CD etc.); L
iIt is the compressed bit stream bit number of the i frame of having encoded in second sliding window; N is the size of second sliding window; (M-1) be positioned at the present frame goal-selling bit number sum that amounts to (M-1) frame afterwards in * (bitrate/N) expression second sliding window; (bitrate/N) target bit of N frame in expression second sliding window, this value can calculate according to the target bit rate bitrate of the encoder that is provided with.M greater than 1 less than N.Preferably, M is 3 or 4.
Like this; Encoder is before the coding present frame; Can use second sliding window to calculate the target bit upper limit of present frame, when the compressed bit stream bit number of having exported the 1st to N-M frame in second sliding window as if having encoded is big, can control the present frame target bit upper limit in advance; Prevent continuous frame-skipping, improve the image fluency of encoder output.
Then, encoder is according to the target bit upper limit T of present frame
N-(M-1)The target bit of adjustment present frame, the target bit according to present frame calculates the QP value again, and present frame is encoded.
305, the position of first sliding window is set, makes present frame be positioned at the N frame of said first sliding window.
306, judge whether to export present frame.
Calculate the compressed bit stream bit number sum of all frames in first sliding window.
If the compressed bit stream bit number sum of all frames is greater than preset sign indicating number
in first sliding window
Encoder is not exported present frame N, promptly abandons present frame.Wherein, L
NBit number for current encoded frame; L
iIt is the compressed bit stream bit number of the i frame of having encoded in first sliding window; Maxbitrate specifically can be the network bandwidth upper limit of presetting for preset limit bit rate, the limit bit rate that perhaps obtains according to the capacity conversion of storage media (like hard disk, CD etc.); N is the size of first sliding window, promptly preset frame per second.
If the compressed bit stream bit number sum of all frames is not more than preset
in first sliding window
Encoder output present frame N.Wherein, L
NBit number for current encoded frame; L
iIt is the compressed bit stream bit number of the i frame of having encoded in first sliding window; Maxbitrate specifically can be the network bandwidth upper limit of presetting for preset limit bit rate, the limit bit rate that perhaps obtains according to the capacity conversion of storage media (like hard disk, CD etc.); N is the size of first sliding window, promptly preset frame per second.
Need to prove that for present frame, step 301～302 can be carried out with step 303～304 simultaneously, step 303～304 also can be carried out in step 301～302 before, also can only carry out step 301～and 302, perhaps only carry out step 303～304.It is understandable that more than distortion and other distortion that can do according to thinking of the present invention all should be included protection scope of the present invention in.
As shown in Figure 4, the embodiment of the invention also provides the control device 4 of code check in a kind of video coding, comprise,
Sliding window is provided with module 41, is used to be provided with the position of first sliding window, makes present frame be positioned at the N frame of said first sliding window.
Output judge module 42 is used to judge whether to export present frame, if the compressed bit stream bit number sum of all frames is not exported present frame greater than preset limit bit rate in first sliding window.
Wherein, the size of said first sliding window frame per second N that equals to preset.
Further, install 4 and also comprise,
Coding judge module 43 is used to judge whether the present frame of encoding, if the target bit sum that the compressed bit stream bit number sum of interior the 1st frame to the N-1 frame of first sliding window and N frame are preset is greater than preset limit bit rate, the present frame of not encoding.
Wherein, the size of said first sliding window frame per second N that equals to preset.
Further, sliding window is provided with unit 41, also is used to be provided with the position of second sliding window, makes said present frame be positioned at N-(M-1) frame of said second sliding window;
Said device 4 also comprises,
Determination module 44 is used for confirming according to the compressed bit stream bit number sum of the 1st frame to the N-M frame in second sliding window target bit upper limit of present frame;
Wherein, the size of said second sliding window frame per second N that equals to preset.
The control device of code check can be carried out the step among the said method embodiment in the video coding shown in Figure 4, each function of Method Of Accomplishment embodiment, and the description of pressing method embodiment in its application process realizes the control method of code check in the video coding.
Exemplary, the control device of code check can be an encoder in the video coding shown in Figure 4.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, 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 said claim.
Claims (8)
1. the control method of code check in the video coding is characterized in that, comprising:
The position of first sliding window is set, makes present frame be positioned at the N frame of said first sliding window;
If the compressed bit stream bit number sum of all frames is not then exported present frame greater than preset limit bit rate in first sliding window; Wherein, the size of said first sliding window frame per second N that equals to preset.
2. method according to claim 1; It is characterized in that; Also comprise between said " position of first sliding window being set; make present frame be positioned at the N frame of said first sliding window " and said " if the compressed bit stream bit number sum of first sliding window is not exported present frame greater than preset limit bit rate ":
If the preset target bit sum of the compressed bit stream bit number sum of the 1st frame to the N-1 frame and N frame is greater than preset limit bit rate in first sliding window, the present frame of not encoding, the treatment step end of present frame;
If the preset target bit sum of the compressed bit stream bit number sum of the 1st frame to the N-1 frame and N frame is not more than preset limit bit rate in first sliding window, the coding present frame.
3. method according to claim 1 is characterized in that, the said position that first sliding window is set also comprises present frame before being positioned at the N frame of said first sliding window,
The position of second sliding window is set, makes said present frame be positioned at N-(M-1) frame of said second sliding window;
Confirm the target bit upper limit of present frame according to the compressed bit stream bit number sum of the 1st frame to the N-M frame in second sliding window;
Wherein, the size of said second sliding window frame per second N that equals to preset.
4. method according to claim 3 is characterized in that, is limited on the target bit of said present frame,
Wherein, T
N-(M-1)Be the present frame target bit upper limit; Maxbitrate is preset limit bit rate; L
iIt is the compressed bit stream bit number of the i frame of having encoded in second sliding window; N is the size of second sliding window; (M-1) be positioned at the present frame goal-selling bit number sum that amounts to (M-1) frame afterwards in * (bitrate/N) expression second sliding window.
5. method according to claim 4 is characterized in that, said M value is 3 or 4.
6. the control device of code check in the video coding is characterized in that, comprise,
Sliding window is provided with module, is used to be provided with the position of first sliding window, makes present frame be positioned at the N frame of said first sliding window;
The output judge module is used to judge whether to export present frame, if the compressed bit stream bit number sum of all frames is not exported present frame greater than preset limit bit rate in first sliding window;
Wherein, the size of said first sliding window frame per second N that equals to preset.
7. device according to claim 6 is characterized in that, also comprises,
The coding judge module is used to judge whether the present frame of encoding, if the target bit upper limit sum that the compressed bit stream bit number sum of interior the 1st frame to the N-1 frame of first sliding window and N frame are preset is greater than preset limit bit rate, the present frame of not encoding;
Wherein, the size of said first sliding window frame per second N that equals to preset.
8. device according to claim 6 is characterized in that,
Said sliding window is provided with the unit, also is used to be provided with the position of second sliding window, makes said present frame be positioned at N-(M-1) frame of said second sliding window;
Said device also comprises,
Determination module is used for confirming according to the compressed bit stream bit number sum of the 1st frame to the N-M frame in second sliding window target bit upper limit of present frame;
Wherein, the size of said second sliding window frame per second N that equals to preset.
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| CN106851337A (en) * | 2017-02-21 | 2017-06-13 | 聚好看科技股份有限公司 | Video buffer control method and device |
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| CN107852491A (en) * | 2015-07-31 | 2018-03-27 | 深圳市大疆创新科技有限公司 | The bit rate control method of sensor auxiliary |
| CN109862359A (en) * | 2018-12-29 | 2019-06-07 | 北京数码视讯软件技术发展有限公司 | Bit rate control method, device and electronic equipment based on hierarchical B-frame |
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