EP 1118225 A1 20010725 - METHOD AND APPARATUS FOR PROVIDING RATE CONTROL IN A VIDEO ENCODER
Title (en)
METHOD AND APPARATUS FOR PROVIDING RATE CONTROL IN A VIDEO ENCODER
Title (de)
VERFAHREN UND VORRICHTUNG ZUR RATENSTEUERUNG IN EINEM VIDEOCODIERER
Title (fr)
PROCEDE ET DISPOSITIF PERMETTANT D'AGIR SUR LA VITESSE D'UN CODEUR VIDEO
Publication
Application
Priority
- US 9922663 W 19990929
- US 10280098 P 19981002
Abstract (en)
[origin: WO0021302A1] A method and apparatus are provided for controlling the quantization level in a digital video encoder that comprises a plurality of parallel compression engines (12). The input picture is partitioned into a number of panels (10) and each panel is processed by a distinct compression engine (12). A reference quantizer scale is determined before encoding a frame of video. The reference quantizer scale is used at the first slice of every video image panel being processed by the video encoder. The quantizer scale at the last slice of the image panel is then forced to be the same as the first slice. The forcing step can use a piecewise-linear feedback formula. A group of pictures (GOP) target bit rate is adjusted based on the number of film pictures and non-film pictures currently in the processing pipeline of at least one of the compression engines. A higher target bit rate is provided for non-film pictures. A buffer (16) level of the video encoder is used to control the start of a new group of pictures (GOP). The start of a new GOP is delayed if the buffer (16) does not have sufficient space to accommodate an intra-coded (I) frame for the new GOP.
IPC 1-7
IPC 8 full level
G06T 9/00 (2006.01); H04N 7/26 (2006.01); H04N 7/50 (2006.01)
CPC (source: EP KR)
H04N 19/115 (2014.11 - EP); H04N 19/124 (2014.11 - EP KR); H04N 19/132 (2014.11 - EP); H04N 19/136 (2014.11 - EP); H04N 19/142 (2014.11 - EP); H04N 19/157 (2014.11 - EP); H04N 19/174 (2014.11 - EP); H04N 19/177 (2014.11 - EP); H04N 19/18 (2014.11 - EP); H04N 19/436 (2014.11 - EP KR); H04N 19/61 (2014.11 - EP)
Citation (search report)
See references of WO 0021302A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0021302 A1 20000413; AU 6277199 A 20000426; CA 2345538 A1 20000413; CN 1328748 A 20011226; EP 1118225 A1 20010725; KR 20010075530 A 20010809
DOCDB simple family (application)
US 9922663 W 19990929; AU 6277199 A 19990929; CA 2345538 A 19990929; CN 99813843 A 19990929; EP 99950029 A 19990929; KR 20017004165 A 20010331