對質(zhì)量層編碼問題的一點認識

對于做質(zhì)量可伸縮時，為什么設置兩層圖像輸入會得到4個質(zhì)量層？而且后3個層的QP一樣，YUVPSNR是出現(xiàn)在最后？答：我認為，JSVM實際上只是做了兩層的編碼。只是在做第二層編碼的時候，又分為了3個子層，但這三個子層使用的是同一個QP，分層的依據(jù)是layer1.cfg中的變量MGSVectorMode和MGSVectorO?MGSVector2。查SoftwareManual中它們的意思可以知道：當MGSVectorMode為1時,JSVM會根據(jù)MGSVectorX的不同而分配不同數(shù)量的變換系數(shù)（默認為4X4的塊，所斤以也說明了為什么MGSVectorX之和一定要是16）給不同的子層。也就是說，我們看到的彳輸出結果中，后3個層加起來才是一個完整的層的數(shù)據(jù)。所以在最后才輸出一個YUVPSNR。輸出結果。下面是通過修改layer1層中的MGSVectorMode和MGSVectorX后得到的1、MGSVectorMode=0時（以下都是只編5幀）#JSVMMainConfigurationFileOutputFiletest.264#BitstreamfileFrameRate30.0#Maximumframerate[Hz]FramesToBeEncoded5#Numberofframes(atinputframerate)GOPSize16#GOPSize(atmaximumframerate)BaseLayerMode2#Baselayermode(0:AVCwlargerDPB,#1:AVCcompatible,2:AVCwsubseqSEI)CgsSnrRefinement1#SNRrefinementas1:MGS;0:CGSEncodeKeyPictures1#KeypicsatT=0(0:none,1:MGS,2:all)MGSControl2#ME/MCfornon-keypicturesinMGSlayers#(0:std,1:MEwithEL,2:ME+MCwithEL)MGSKeyPicMotRef1#motionrefforMGSkeypics(0:off,1:on)SearchMode4#Searchmode(0:BlockSearch,4:FastSearch)SearchRange32#Searchrange(FullPel)NumLayers2#NumberoflayersLayerCfglayer0.cfg#LayerconfigurationfileLayerCfglayer1.cfg#Layerconfigurationfile#LayerCfglayer2.cfg#Layerconfigurationfile#LayerCfglayer3.cfg#Layerconfigurationfile#JSVMLayer0ConfigurationFileInputFileforeman_4cif.yuv#InputfileSourceWidth352#InputframewidthSourceHeight288#InputframeheightFrameRateIn30#Inputframerate[Hz]FrameRateOut30#Outputframerate[Hz]MGSVectorMode0#MGSvectorusageselection

#JSVMLayerlConfigurationFileInputFileforeman_4cif.yuv#InputfileSourceWidth352#InputframewidthSourceHeight288#InputframeheightFrameRateln30#Inputframerate[Hz]FrameRateOut30#Outputframerate[Hz]InterLayerPred1#Inter-layerPrediction(0:no,1:yes,2:adaptive)MGSVectorMode0#MGSvectorusageselectionMGSVectorO4#Specifies0thpositionofthevectorMGSVector14#Specifies1stpositionofthevectorMGSVector28#Specifies2ndpositionofthevectorhu0：IKT0L0Q0QP26￥39.1269U38.7944U38.7343151864bit0：IKT0L0QIQP21￥43.2128U42.7050U42.705396864bitAU4：PT2L0Q0QP29￥37.1293U35.3290U34.424926248bit4：PT2L0QIQP24￥40.2143U39.2967U38.597527672bitAU2：BT3L0Q0QP31￥36.6743U35.9041U36.936647056bit2：BT3L0QIQP26￥40.3855U38.7189U39.470842824bit1：BT4L0Q0QP32￥34.1755U34.2980U34.080181032bit1：BT4L0QiQP27￥38.6576U37.9857U37.814254704bitAU3：BT4L0Q0QP32￥45.4417U34.3919U35.04058536bit3：BT4L0QIQP27￥47.1293U38.1373U39.143611032bitEUNMARV：bitrateMin-biti?V-PSNRU-PSNRU-PSNR352x288&1.8750467.1750285.555043.212842.705042.7053352x288(?3.7500934.3500571.110043.212842.705042.7053352x288(?7.50001136.5500669.540041.713541.000940.6514352x288e15.00001964.80001128.000041.270940.240240.2578352x288(?30.00003289.58401891.008041.919939.368739.54632、MGSVectorMode=1,MGSVectorO=16時由于main.cfg,layer0文件和上述的一樣，這里不再給出，只給出layer1層的配置文件。#JSVMLayerlConfigurationFileInputFileforeman_4cif.yuv#InputfileSourceWidth352#InputframewidthSourceHeight288#InputframeheightFrameRateIn30#Inputframerate[Hz]FrameRateOut30#Outputframerate[Hz]InterLayerPred1#Inter-layerPrediction(0:no,1:yes,2:adaptive)MGSVectorMode1#MGSvectorusageselectionMGSVector016#Specifies0thpositionofthevector

AU0IKT0L0Q0QP26￥39.1269U38.7944U38.7343151864bit0IKT0L0QIQP21￥43.2128U42.7050U42.705396864bitAU4PT2L0Q0QP29￥37.1293U35.3290U34.424926248bit4PT2L0QIQP24Y40.2143U39.2967U38.597527672bitAU2BT3L0Q0QP31￥36.6743U35.9041U36.936647056bit2BT3L0QiQP26￥40.3855U38.7189U39.470842824bitAU1BT4L0Q0QP32V34.1755U34.2980U34.080181032bit1BT4L0QIQP27￥38.6576U37.9857U37.814254704bitAU3BT4L0Q0QP32￥45.4417U34.3919U35.04058536bit3BT4L0QiQP27￥47.1293U38.1373U39.143611032bitSUMMARV：bitrateMin-biti*V-PSNRU-PSNB U-PSNR352x288(?1.8750467.1750285.555043.212842.705042.7053352x288(?3.7500934.3500571.110043.212842.705042.7053352x288(?7.50001136.5500669.540041.713541.000940.6514352x288(?15.00001964.80001128.000041.270940.240240.2578352x288030.00003289.58401891.008041.919939.368?39.5463此情況實際跟第一種情況是一個意思。2、MGSVectorMode= 1,MGSVector0=4,MGSVector1=12時由于main.cfg,layerO文件和上述的一樣，這里不再給出，只給出layerl層的配置文件。#JSVMLayerlConfigurationFileInputFileforeman_4cif.yuv#InputfileSourceWidth352#InputframewidthSourceHeight288#InputframeheightFrameRateIn30#Inputframerate[Hz]FrameRateOut30#Outputframerate[Hz]InterLayerPred1#Inter-layerPrediction(0:no,1:yes,2:adaptive)MGSVectorMode1#MGSvectorusageselectionMGSVector04#Specifies0thpositionofthevectorMGSVector112#Specifies1stpositionofthevector

AU0IKT0L0Q0QP26￥39.1269U38.7944U38.7343151864bit0IKT0L0QIQP2141024bit0IKT0L0Q2QP21￥43.2128U42.7050U42.705356032bitAU4PT2L0Q0QP29￥37.1293U35.3290U34.424926248bit4PT2L0QIQP2416632bit4PT2L0Q2QP24￥40.2631U39.3460U38.691313240bitAU2BT3L0Q0QP31￥36.6743U35.9041U36.936647056bit2BT3L0QIQP2623648bit2BT3L0Q2QP26Y40.3855U38.7189U39.470819920bitAU1BT4L0Q0QP32￥34.1755U34.2980U34.080181032bit1BT4L0QiQP2731560bit1BT4L0Q2QP27￥38.6153U38.0030U37.821223592bitAU3BT4L0Q0QP32￥45.4417U34.3919U35.04058536bit3BT4L0QIQP276952bit3BT4L0Q2QP27￥47.1293U38.1373U39.14364024bitSUMMARV：hitFateMin-bitrV-PSNR U-PSNB U-PSNR352x288(?1.8750467.5350285.555043.2128 42.7050 42.7053352x288(?3.7500935.0700571.110043.2128 42.7050 42.7053352x288(?7.50001145.5200669.540041.7379 41.0255 40.6983352x288(?15.00001980.48001128.000041.2871 40.2566 40.2891352x288P30.00003310.75201891.008041.9212 39.3820 39.56642、MGSVectorMode= 1,MGSVectorO=4,MGSVector1=4，MGSVector2=8時由于main.cfg,layer0文件和上述的一樣，這里不再給出，只給出layer1層的配置文件。#JSVMLayerlConfigurationFileInputFileforeman_4cif.yuv#InputfileSourceWidth352#InputframewidthSourceHeight288#InputframeheightFrameRateln30#Inputframerate[Hz]FrameRateOut30#Outputframerate[Hz]InterLayerPred1#Inter-layerPrediction(0:no,1:yes,2:adaptive)MGSVectorMode1#MGSvectorusageselectionMGSVectorO4#SpecifiesOthpositionofthevectorMGSVector14#Specifies1stpositionofthevectorMGSVector28#Specifies2ndpositionofthevectorAU0：0：0：0：IKIKIKIKT0L0Q0T0L0QIT0L0Q2QP26QP21QP21Y39.1269U38.?944U38.7343151864410241780837888bitbitbitbitU42.7053U42.7050T0L0Q3QP21Y43.2128AU4：PT2L0Q0QP29Y37.1293U35.3290U34.424926248bit4：PT2L0QiQP2416632bit4：PT2L0Q2QP242856bit4：PT2L0Q3QP24Y40.2631U39.3460U38.691