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CBR can't work when encode MPEG4 QQVGA frame

Tracy lee
Expert 1505 points

Hi all:

        I have found a new issue on DM365 that CBR can't work when encode MPEG4 QQVGA frame, both the YUV420SP and YUV422ILE can't work too. Seems the CBR algorithm don't work when encode MPEG4 QQVGA frame.

       Anyone who can help on this?

       Highly appreciate!

  • 0
    Intellectual 340 points

    Hi,

     

    Can you please provide the details of Parameter settings (both create time & dynamic)?

    Please note that QQVGA is dupported only for 422ILE input format (with UMV OFF) as per DataSheet.

     

    Regards,

    Tej

  • 0 in reply to Tej Pandey
    Expert 1505 points

    Hi Tej:

           I'm prety sure that we use YUV422ILE input with UMV OFF, here provide some detail for you reference:

    pObj->params.size       = sizeof(IMP4VENC_Params);
    pObj->params.rateControlPreset     = IVIDEO_LOW_DELAY;
    pObj->params.maxHeight             = 120;
    pObj->params.maxWidth              = 160;
    pObj->params.maxFrameRate          = 30000 ;
    pObj->params.maxBitRate            = 16000000;
    pObj->params.inputChromaFormat = XDM_YUV_422ILE;
    pObj->params.dataEndianness        = XDM_BYTE;
    pObj->params.maxInterFrameInterval = 0;
    pObj->params.inputContentType      = IVIDEO_PROGRESSIVE;
    pObj->params.reconChromaFormat     = XDM_YUV_422ILE;
    pObj->params.maxHeight  = 120;
    pObj->params.maxWidth   = 256;
    pObj->params_mpeg4.subWindowHeight = 120;
    pObj->params_mpeg4.subWindowWidth = 160;
    pObj->params_mpeg4.rotation = 0;
    pObj->params_mpeg4.vbvSize = 0;
    pObj->params_mpeg4.svhMode = 0;

    pObj->dynamicParams.size = sizeof(pObj->dynamicParams_mpeg4);
    pObj->dynamicParams.inputHeight         = 120;
    pObj->dynamicParams.inputWidth          = 160;
    pObj->dynamicParams.targetBitRate       = 256000;
    pObj->dynamicParams.intraFrameInterval  = pObj->createPrm.keyFrameInterval;
    pObj->dynamicParams.generateHeader      = XDM_ENCODE_AU;
    pObj->dynamicParams.captureWidth        = 256;
    pObj->dynamicParams.targetFrameRate     = 30000;
    pObj->dynamicParams.refFrameRate        = 30000;
    pObj->dynamicParams.inputHeight  = 120;
    pObj->dynamicParams.inputWidth  = 160;
    pObj->dynamicParams.captureWidth        = 0;
    pObj->dynamicParams_mpeg4.intraAlgo      = 1;
    pObj->dynamicParams_mpeg4.numMBRows      = 7;//(pObj->createPrm.height/16)
    pObj->dynamicParams_mpeg4.initQ          = 4;
    pObj->dynamicParams_mpeg4.rcQMax         = 25;
    pObj->dynamicParams_mpeg4.rcQMin         = 4;
    pObj->dynamicParams_mpeg4.rateFix        = 0;
    pObj->dynamicParams_mpeg4.rateFixRange   = 2;
    pObj->dynamicParams_mpeg4.meAlgo         = 3;
    pObj->dynamicParams_mpeg4.skipMBAlgo     = 0;
    pObj->dynamicParams_mpeg4.unrestrictedMV = 0;
    pObj->dynamicParams_mpeg4.interFrameQP   = 0;
    pObj->dynamicParams_mpeg4.intraFrameQP   = 0;
    pObj->dynamicParams_mpeg4.mvDataEnable   = 0;

           I found that the CVBR mode can work well with the same settings.

  • 0 in reply to Tracy lee
    Expert 1640 points

    Hi Tracy,

    I ran the encoder with the parameters specified above but I do not observe any issues in the encoded output as such.

    Can you please elaborate what exactly is the problem? If you could attach a sample of a problem stream, that would be great.

    Thanks,

    Akshay.