CN1269360C - 预先不了解画面类型情况下mpeg代码转换器的比率控制系统 - Google Patents
预先不了解画面类型情况下mpeg代码转换器的比率控制系统 Download PDFInfo
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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- 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
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- 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
- H04N19/172—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 picture, frame or field
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- H04N19/177—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 a group of pictures [GOP]
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Abstract
Description
GOP(N=M=1): | … | Im-1 | Im | Im+1 | Im+2 | … | ||||||||
GOP(N,M=1): | … | Pm-1 | Im | Pm+1 | Pm+2 | … | Pm+N-1 | Im+N | Pm+N+1 | … | ||||
GOP(N=M): | … | Bm-1 | Im | Bm+1 | Bm+2 | … | Bm+M-1 | Im+M | Bm+M+1 | … | ||||
GOP(N,M): | … | Bm-1 | Im | Bm+1 | Bm+2 | … | Bm+M-1 | Pm+M | Bm+M+1 | … | Pm+2M | … | Im+N | … |
GOP(M=1): | … | Pm-1 | Pm | Pm+1 | Pm+2 | … | ||||||||
GOP(M): | … | Bm-1 | Pm | Bm+1 | Bm+2 | … | Bm+M-1 | Pm+M | Bm+M+1 | … | Pm+2M | … |
GOP(N=M=1): | Im | Im+1 | Im+2 | … | |||||||||
GOP(N,M=1): | Im | Pm+1 | Pm+2 | … | Pm+N-1 | Im+N | Pm+N+1 | … | |||||
GOP(N=M): | Im | Bm-(M-1) | Bm-(M-1)+1 | … | Bm-1 | Im+M | Bm+1 | … | |||||
GOP(N,M): | Im | Bm-(M-1) | Bm-(M-1)+1 | … | Bm-1 | Pm+M | Bm+1 | … | Bm+M-1 | Pm+2M | … | Im+N | … |
GOP(M=1): | Pm | Pm+1 | Pm+2 | … | |||||||||
GOP(M): | Pm | Bm-(M-1) | Bm-(M-1)+1 | … | Bm-1 | Pm+M | Bm+1 | … | Bm+M-1 | Pm+2M | … |
GOP0(N=M): | I0 | B1 | B2 | … | BM-1 | IM | BM+1 | … | I2M | … | |||||
GOP0(N,M): | I0 | B1 | B2 | … | BM-1 | PM | BM+1 | … | B2M-1 | P2M | … | P3M | … | IN | … |
GOP0(M): | P0 | B1 | B2 | … | BM-1 | PM | BM+1 | … | P2M | … |
GOP0(N=M): | I0 | IM | B1 | B2 | … | BM-1 | I2M | BM+1 | … | |||||
GOP0(N,M): | I0 | PM | B1 | B2 | … | BM-1 | P2M | BM+1 | … | B2M-1 | P3M | … | IN | … |
GOP0(M): | P0 | PM | B1 | B2 | … | BM-1 | P2M | BM+1 | … |
/**下面是变量的简要描述:**N 估计打开的GOP长度(画面)*M 连续B-画面加1的数*N’初始猜测的画面中的GOP长度*M’初始猜测的连续B-画面加1的数*N”更新的估计打开的GOP长度*M”更新的连续B-画面加1的数*R 该GOP中的剩余比特数*n 该GOP中的剩余画面数*ni 该GOP中的剩余I-画面数*np 该GOP中的剩余P-画面数*nb 该GOP中的剩余B-画面数*Xi I-画面的复杂性*Xp P-画面的复杂性*Xb B-画面的复杂性*Ki I-画面的复杂性除法器*Kp P-画面的复杂性除法器*Kb B-画面的复杂性除法器*X 时间变化的复杂性*T 当前画面类型的目标比特数*Pict_type 当前画面类型*Prev_pict_type 以编码顺序的前一个画面类型*Tem_ref 当前画面时间标记*Prev_temp_ref 前一个画面时间标记(编码顺序)*Prog_refresh 如果不处理顺序刷新则为非零 |
*GOP_flag 如果GOP标题在当前画面前面则为非零*Seq_hdr_flag 如果序列标题在当前画面前面则为非零*bit_ate() 当前平均输出比特率*Framerate() 使用repea_firs_field的平均显示帧频注意:1)“div”操作表示舍位为零的计算机整除。2)一个GOP在编码顺序中以I-画面开始并扩展到下一个I-画面,与GOP语法是否出现在比特流中无关。当使用顺序刷新时,一个GOP由一个P-画面加下面的连续B-画面的运算组成。*/下面为C-语言程序。FindSequenceHeader();N=N'; //(N'%M′)=0;N is estimated open GOP lengthM=M′;R=0;n=0;prev_pict_type=B_PICTURE;for(;;){/* |
*get_picture_header() parses the video sequence and the optional*GOP layer,and returns the picture type and temporal reference*of the next coded picture.*/pict_type=get_pict_header(&temp_ref,GOP_flag,&seq_hdr_flag);if(seq_hdr_flag)prog_refresh=(pict_type!=I_PICTURE);switch(pict_type){case I_PICTURE:if(prev_pict_type!=B_PICTURE){/**GOP(N=M=1),GOP(N,M=1)or GOP0(N=M).RecalculateM,*start new GOP and correct R for missing B pictures.*/M"=GOP_flag?(temp_ref+1):((temp_ef-prev_temp_ref+1024)&0x3FF);R-=n*bit_rate()/frame_rate();M=M";N=(prev_pict_type=I_PICTURE)?M:(N-n);n=0;}if(prog_refresh) //End of progressive refreshN=N′;prog_refresh=0;if(n<=0){//GOP length is equal to expected length |
R+=N*bit_rate()/frame_rate();}else{ //GOP length is shorter than expectedN-=n;N=(N div M)*M;R+=(N-n)*bit_rate()/frame_rate();}n=N;ni=1;np=N/M-1;nb=N-ni-np;X=Xi/Ki;prev_temp_ref=temp_ref;break;case P_PICTURE:if(prev_pict_type !=B_PICTURE){/**GOP(M=1)or GOP0(M) [progressiverefresh]*GOP(N,M=1)or GOP0(N,M)[non-progressiverefresh]*/M"=(temp_ref-prev_temp_ref+1024)&0x3FF;R-=(M-1)*bit_rate()/frame_rate();nb-=M-1;n-=M-1;if((M"!=M)&&!prog_refresh){ |
N"=(N div M")*M";//open,not actual,GOPlengthn+=(N"-N)-(M"-M);R+=((N"-N)-(M"-M))*bit_rate()/frame_rate();np=n div M";nb=n-np;N=N";}M=M";}if(n<=0){/**End of GOP in progressive refresh mode or GOP is*longer than expected innon-progressive refreshmode.*/N+=M;R+=M*bit_rate()/frame_rate();n=M;ni=0;np=1;nb=M-1;}X=Xp/Kp;prev_temp_ref=temp_ref;break; |
caseB_PICTURE:if(prev_pict_type!=B_PICTURE){/**GOP(N=M),GOP(N,M),GOP0(N,M)[non-progressiverefresh]*GOP(M)[progressive refresh]*/M"=(prev_temp_ref-temp_ref+1025)&0x3FF;if(M"!=M){if(prog_refresh){nb+=M"-M;R+=(M"-M)*bit_rate()/frame_rate();}else{N"=(N div M")*M";n+=N"-N;R+=(N"-N)*bit_rate()/frame_rate();np=(n+1)div M"-1;nb=n-np;N=N";}M=M";}}X=Xb/Kb;break;} |
/**Calculate the target bit rate*/T=X*R/(ni*Xi/Ki+np*Xp/Kp+nb*Xb/Kb);switch(pict_type){ //Decrement pic count for each picture typecase I_PICTURE:ni--;break;case P_PICTURE:np--;break;case B_PICTURE:nb--;break;}n=n-1; //Number ofpictures left in GOPprev_pict_type=pict_type;/**transcode_picture()does the actual transcoding which maintains*in original picture type(I,P or B).This function retums*the actual size of the transcoded picture in bits.This func-*tion updates the complexity(Xi,Xp,Xb)for each picture type.*/R-=transcode_picture(pict_type,T);} |
GOP1 | GOP2 | GOP3 | |
NM | 303 | 122 | 81 |
Claims (76)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/198,867 US6570922B1 (en) | 1998-11-24 | 1998-11-24 | Rate control for an MPEG transcoder without a priori knowledge of picture type |
US09/198,867 | 1998-11-24 |
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CN1255022A CN1255022A (zh) | 2000-05-31 |
CN1269360C true CN1269360C (zh) | 2006-08-09 |
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US (2) | US6570922B1 (zh) |
EP (1) | EP1005232B1 (zh) |
KR (1) | KR100880055B1 (zh) |
CN (1) | CN1269360C (zh) |
AT (1) | ATE385650T1 (zh) |
CA (1) | CA2286640C (zh) |
DE (1) | DE69938093T2 (zh) |
TW (1) | TW450006B (zh) |
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KR100880055B1 (ko) | 2009-01-22 |
DE69938093T2 (de) | 2009-04-30 |
CN1255022A (zh) | 2000-05-31 |
EP1005232B1 (en) | 2008-02-06 |
KR20000035651A (ko) | 2000-06-26 |
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CA2286640A1 (en) | 2000-05-24 |
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