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视频码率很大问题

Free
Prodigy 220 points


如下图场景，图像1920*1080大小，配置码率为2M。

大场景时，实际码率与配置码率基本匹配。

变焦至小场景，当风吹过树叶，画面运动量很大时，图像的码率会很大，会达到10M左右，视频可能会卡顿或者花屏，CBR与VBR均不能降低码率。

请问：有没有好方法来控制码率？谢谢。

  • 0
    TI__Guru**** 155073 points

    你好，

    请问使用的是哪款芯片？

  • 0 回复 Chris Meng
    Prodigy 220 points

    你好，我们使用的是APPRO DM8127 IPNC，RDK3.8。

    设置了I帧与P帧的QPmax值，码率可以降一些，但有时候还是控制不住。

  • 0 回复 Free
    TI__Guru**** 155073 points

    你好，

    CBR可以通过丢帧来保证码率，但会出现卡顿现象。

    VBR在运动较大的时候码率增加是正常现象。

    你是否使用的是HP? HP支持的选项是否都使能了？QPmax设置为51了？

  • 0 回复 Chris Meng
    Prodigy 220 points

    你好，我使用的是HP，动态参数请见下面。

    QPmax设置为51时，码率控制的较好，图像质量也下降的厉害，马赛克明显：

    1、设置为2M码率，小场景多运动画面，最大会升到5M左右。

    2、返回大场景时，码率变得比较小，只有500K左右，画面跳动，需要较长时间回到2M。

    下面是264的动态参数配置，麻烦看看有什么改进的地方，谢谢。

    另：QP值是不是可以根据码率动态调整？如何实时统计视频码率以决定跳帧或改变QP？谢谢。

    [m3video] --------- CH 0 : H264 ENC : Dynamic Params -------
    [m3video]
    [m3video] videnc2DynamicParams -> inputHeight : 1080
    [m3video] videnc2DynamicParams -> inputWidth : 1920
    [m3video] videnc2DynamicParams -> refFrameRate : 25000
    [m3video] videnc2DynamicParams -> targetFrameRate : 25000
    [m3video] videnc2DynamicParams -> targetBitRate : 2000000
    [m3video] videnc2DynamicParams -> intraFrameInterval : 30
    [m3video] videnc2DynamicParams -> generateHeader : 0
    [m3video] videnc2DynamicParams -> captureWidth : 1952
    [m3video] videnc2DynamicParams -> forceFrame : -1
    [m3video] videnc2DynamicParams -> interFrameInterval : 1
    [m3video] videnc2DynamicParams -> mvAccuracy : 2
    [m3video] videnc2DynamicParams -> sampleAspectRatioHeight : 1080
    [m3video] videnc2DynamicParams -> sampleAspectRatioWidth : 1920
    [m3video] videnc2DynamicParams -> ignoreOutbufSizeFlag : 1
    [m3video] videnc2DynamicParams -> lateAcquireArg : 0
    [m3video]
    [m3video] rateControlParams -> rateControlParamsPreset : 1
    [m3video] rateControlParams -> scalingMatrixPreset : 1
    [m3video] rateControlParams -> rcAlgo : 0
    [m3video] rateControlParams -> qpI : -1
    [m3video] rateControlParams -> qpMaxI : 46
    [m3video] rateControlParams -> qpMinI : 10
    [m3video] rateControlParams -> qpP : 28
    [m3video] rateControlParams -> qpMaxP : 51
    [m3video] rateControlParams -> qpMinP : 10
    [m3video] rateControlParams -> qpOffsetB : 0
    [m3video] rateControlParams -> qpMaxB : 40
    [m3video] rateControlParams -> qpMinB : 40
    [m3video] rateControlParams -> allowFrameSkip : 0
    [m3video] rateControlParams -> removeExpensiveCoeff : 0
    [m3video] rateControlParams -> chromaQPIndexOffset : 0
    [m3video] rateControlParams -> IPQualityFactor : 0
    [m3video] rateControlParams -> initialBufferLevel : 4000000
    [m3video] rateControlParams -> HRDBufferSize : 4000000
    [m3video] rateControlParams -> minPicSizeRatioI : 0
    [m3video] rateControlParams -> maxPicSizeRatioI : 960
    [m3video] rateControlParams -> minPicSizeRatioP : 0
    [m3video] rateControlParams -> maxPicSizeRatioP : 0
    [m3video] rateControlParams -> minPicSizeRatioB : 0
    [m3video] rateControlParams -> maxPicSizeRatioB : 0
    [m3video] rateControlParams -> enablePRC : 1
    [m3video] rateControlParams -> enablePartialFrameSkip : 0
    [m3video] rateControlParams -> discardSavedBits : 1
    [m3video] rateControlParams -> VBRDuration : 8
    [m3video] rateControlParams -> VBRsensitivity : 0
    [m3video] rateControlParams -> skipDistributionWindowLength: 5
    [m3video] rateControlParams -> numSkipInDistributionWindow : 1
    [m3video] rateControlParams -> enableHRDComplianceMode : 1
    [m3video] rateControlParams -> frameSkipThMulQ5 : 0
    [m3video] rateControlParams -> vbvUseLevelThQ5 : 0
    [m3video]
    [m3video] interCodingParams-> interCodingPreset : 1
    [m3video] interCodingParams-> searchRangeHorP : 144
    [m3video] interCodingParams-> searchRangeVerP : 32
    [m3video] interCodingParams-> searchRangeHorB : 144
    [m3video] interCodingParams-> searchRangeVerB : 16
    [m3video] interCodingParams-> interCodingBias : 1
    [m3video] interCodingParams-> skipMVCodingBias : 1
    [m3video] interCodingParams-> minBlockSizeP : 1
    [m3video] interCodingParams-> minBlockSizeB : 1
    [m3video] interCodingParams-> meAlgoMode : 0
    [m3video]
    [m3video] intraCodingParams-> intraCodingPreset : 1
    [m3video] intraCodingParams-> lumaIntra4x4Enable : 0
    [m3video] intraCodingParams-> lumaIntra8x8Enable : 255
    [m3video] intraCodingParams-> lumaIntra8x8Enable : 15
    [m3video] intraCodingParams-> chromaIntra8x8Enable : 15
    [m3video] intraCodingParams-> chromaComponentEnable : 1
    [m3video] intraCodingParams-> intraRefreshMethod : 0
    [m3video] intraCodingParams-> intraRefreshRate : 0
    [m3video] intraCodingParams-> gdrOverlapRowsBtwFrames : 0
    [m3video] intraCodingParams-> constrainedIntraPredEnable : 0
    [m3video] intraCodingParams-> constrainedIntraPredEnable : 0
    [m3video]
    [m3video] nalUnitControlParams -> naluControlPreset : 1
    [m3video] nalUnitControlParams -> naluPresentMaskStartOfSequence : 8608
    [m3video] nalUnitControlParams -> naluPresentMaskIDRPicture : 8672
    [m3video] nalUnitControlParams -> naluPresentMaskIntraPicture : 8450
    [m3video] nalUnitControlParams -> naluPresentMaskNonIntraPicture : 2
    [m3video] nalUnitControlParams -> naluPresentMaskEndOfSequence : 3072
    [m3video]
    [m3video] sliceCodingParams-> sliceCodingPreset : 1
    [m3video] sliceCodingParams-> sliceMode : 0
    [m3video] sliceCodingParams-> sliceUnitSize : 0
    [m3video] sliceCodingParams-> sliceStartOffset[IH264ENC_MAX_NUM_SLICE_START_OFFSET] : 0 0 0
    [m3video] sliceCodingParams-> streamFormat : 0
    [m3video]
    [m3video] loopFilterParams-> loopfilterPreset : 0
    [m3video] loopFilterParams-> loopfilterDisableIDC : 0
    [m3video] loopFilterParams-> filterOffsetA : 0
    [m3video] loopFilterParams-> filterOffsetB : 0
    [m3video]
    [m3video] fmoCodingParams-> fmoCodingPreset : 0
    [m3video] fmoCodingParams-> numSliceGroups : 1
    [m3video] fmoCodingParams-> liceGroupMapType : 4
    [m3video] fmoCodingParams-> liceGroupChangeDirectionFlag : 0
    [m3video] fmoCodingParams-> liceGroupChangeRate : 0
    [m3video] fmoCodingParams-> sliceGroupChangeCycle : 0
    [m3video] fmoCodingParams-> sliceGroupParams : [0 0]
    [m3video]
    [m3video] vuiCodingParams-> vuiCodingPreset : 1
    [m3video] vuiCodingParams-> aspectRatioInfoPresentFlag : 0
    [m3video] vuiCodingParams-> aspectRatioIdc : 255
    [m3video] vuiCodingParams-> videoSignalTypePresentFlag : 1
    [m3video] vuiCodingParams-> videoFormat : 5
    [m3video] vuiCodingParams-> videoFullRangeFlag : 1
    [m3video] vuiCodingParams-> timingInfoPresentFlag : 1
    [m3video] vuiCodingParams-> hrdParamsPresentFlag : 1
    [m3video] vuiCodingParams-> numUnitsInTicks : 1000
    [m3video]
    [m3video] stereoInfoParams-> stereoInfoPreset : 0
    [m3video] stereoInfoParams-> topFieldIsLeftViewFlag : 1
    [m3video] stereoInfoParams-> viewSelfContainedFlag : 0
    [m3video]
    [m3video] framePackingSEIParams-> framePackingPreset : 0
    [m3video] framePackingSEIParams-> framePackingType : 3
    [m3video] framePackingSEIParams-> frame0PositionX : 0
    [m3video] framePackingSEIParams-> frame0PositionY : 0
    [m3video] framePackingSEIParams-> frame1PositionX : 0
    [m3video] framePackingSEIParams-> frame1PositionY : 0
    [m3video]
    [m3video] svcCodingParams-> svcExtensionFlag : 0
    [m3video] svcCodingParams-> dependencyID : 0
    [m3video] svcCodingParams-> qualityID : 0
    [m3video] svcCodingParams-> enhancementProfileID : 0
    [m3video] svcCodingParams-> layerIndex : 0
    [m3video] svcCodingParams-> refLayerDQId : 0
    [m3video]
    [m3video] interlaceCodingType : 3
    [m3video] bottomFieldIntra : 0
    [m3video] gopStructure : 0
    [m3video] entropyCodingMode : 1
    [m3video] transformBlockSize : 1
    [m3video] log2MaxFNumMinus4 : 10
    [m3video] picOrderCountType : 0
    [m3video] enableWatermark : 0
    [m3video] IDRFrameInterval : 1
    [m3video] maxIntraFrameInterval : 60
    [m3video] debugTraceLevel : 1
    [m3video] lastNFramesToLog : 31
    [m3video] enableAnalyticinfo : 1
    [m3video] enableGMVSei : 0
    [m3video] constraintSetFlags : 0
    [m3video] enableRCDO : 0
    [m3video] enableLongTermRefFrame : 0
    [m3video] LTRPPeriod : 0
    [m3video] searchCenter : 32767
    [m3video] enableStaticMBCount : 0
    [m3video] extMemoryDebugTraceAddr : -1171076224
    [m3video] numTemporalLayer : 1
    [m3video] referencePicMarking: 1
    [m3video] extMemoryDebugTraceSize : 43008
    [m3video] enableROI : 0
    [m3video]
    [m3video]

  • 0 回复 Free
    TI__Guru**** 155073 points

    你好，

    图像质量和图像码率一直是矛盾的，QP大图像质量变差是正常现象。

    如果你希望码率控制可以较快恢复，你可以尝试配置下面的参数为目标码率的一半。

    [m3video] rateControlParams -> initialBufferLevel : 4000000
    [m3video] rateControlParams -> HRDBufferSize : 4000000

    另：QP值是不是可以根据码率动态调整？如何实时统计视频码率以决定跳帧或改变QP？谢谢。

    【Chris】目前h264enc算法里面的码率控制用户是不能修改的，如果你要动态调整，你需要自己根据码率情况在h264enc算法之外再做一个码率控制。

  • 0 回复 Chris Meng
    Prodigy 220 points

    好的，非常感谢。