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DM8148 EZSDK encoding constant bitrate

mike A
Genius 3490 points

Hello,


I am using the custom 8148 board with EZSDK on it,  We are setting tVidEncBitRate.nTargetBitrate to 12Mbps, but its observed sometimes it jumps to 27Mbps as well.

Is it possible to force to fixed bitrate ?

Thanks,

Mike

  • 0
    TI__Guru* 80190 points
    Hello,

    You could check these threads:
    e2e.ti.com/.../1286023

    e2e.ti.com/.../1598607

    BR
    Margarita
  • 0 in reply to Margarita Gashova
    Genius 3490 points
    Hi,

    I am using IH264_ENTROPYCODING_CABAC, but the file which you shared uses IH264_ENTROPYCODING_CAVLC, will the below settings,


    //If ratecontrolpreset is set as user defined then the rcAlgo should be set. In case is set as IVIDEO_LOW_DELAY the rcAlgo should be not set
    tStaticParam.videoStaticParams.h264EncStaticParams.videnc2Params.rateControlPreset = IVIDEO_LOW_DELAY;
    tStaticParam.videoStaticParams.h264EncStaticParams.rateControlParams.rateControlParamsPreset = IH264_RATECONTROLPARAMS_USERDEFINED;
    tStaticParam.videoStaticParams.h264EncStaticParams.rateControlParams.rcAlgo = IH264_RATECONTROL_PRC_LOW_DELAY;
    tStaticParam.videoStaticParams.h264EncStaticParams.videnc2Params.maxBitRate = pAppData->nBitRate;
    tStaticParam.videoStaticParams.h264EncStaticParams.rateControlParams.enablePartialFrameSkip = 1;
    tStaticParam.videoStaticParams.h264EncStaticParams.rateControlParams.allowFrameSkip = 1;
    tStaticParam.videoStaticParams.h264EncStaticParams.rateControlParams.HRDBufferSize = pAppData->nBitRate * 0.5;
    tStaticParam.videoStaticParams.h264EncStaticParams.rateControlParams.initialBufferLevel = pAppData->nBitRate * 0.5;

    Still work for CABC ?

    Thanks,
    Mike
  • 0 in reply to mike A
    Expert 2325 points

    Hi Mike,

    Entropycoding cavlc/cabac works irrespective of RateControl type. So cabac will work.

    Regards

    Gajanan

  • 0 in reply to mike A
    TI__Guru* 80190 points
    Hello,

    You could try with these settings.
    Let us know the result.

    BR
    Margarita