How two change encode framerate？

Which API are you using to set encoder frame rate.Also pls share all the params to the API you are using.When you say fps is 30 do you mean when you play the stream in a PC player like VLC ?

I set encoder frame rate use "encPrm.chCreateParams[i].defaultDynamicParams.inputFrameRate".

All params I set is like this.

for (i=0; i<SRC_NUM_CH; i++) {
encPrm.chCreateParams[i].format = IVIDEO_H264HP;
encPrm.chCreateParams[i].profile = IH264_HIGH_PROFILE;
encPrm.chCreateParams[i].dataLayout = IVIDEO_FIELD_SEPARATED;//IVIDEO_FIELD_INTERLEAVED;//progressive ignore the param
encPrm.chCreateParams[i].fieldMergeEncodeEnable = FALSE;
encPrm.chCreateParams[i].maxBitRate = (6 * 1000 * 1000);//-1;
encPrm.chCreateParams[i].encodingPreset = 1; // 3; 1: high quality
encPrm.chCreateParams[i].enableHighSpeed = 0;
encPrm.chCreateParams[i].encodingPreset = XDM_DEFAULT;
encPrm.chCreateParams[i].enableAnalyticinfo = 0;
encPrm.chCreateParams[i].enableWaterMarking = 0;
encPrm.chCreateParams[i].rateControlPreset = IVIDEO_STORAGE;
encPrm.chCreateParams[i].defaultDynamicParams.inputFrameRate = gDemo_info.frameRate;
encPrm.chCreateParams[i].defaultDynamicParams.targetBitRate = (4 * 1000 * 1000);
encPrm.chCreateParams[i].defaultDynamicParams.intraFrameInterval = 20;
encPrm.chCreateParams[i].defaultDynamicParams.interFrameInterval = 1;// 1: no B frame.
encPrm.chCreateParams[i].defaultDynamicParams.mvAccuracy = IVIDENC2_MOTIONVECTOR_QUARTERPEL;
encPrm.chCreateParams[i].defaultDynamicParams.rcAlg = 0 ;
encPrm.chCreateParams[i].defaultDynamicParams.qpMin = 10;
encPrm.chCreateParams[i].defaultDynamicParams.qpMax = 40;
encPrm.chCreateParams[i].defaultDynamicParams.qpInit = -1;
encPrm.chCreateParams[i].defaultDynamicParams.vbrDuration = 8;
encPrm.chCreateParams[i].defaultDynamicParams.vbrSensitivity = 0;
}

I use Elecard StreamEye Tools to see how many fps the encoded data is. I also use another tools to get fps,
30fps shows too.

Instead of setting as create param can you use the following APIs after Venc_start to set the encoder fps

                Venc_setInputFrameRate(chId, xxx); --> Set the input FPS rate here (The rate at which you are feeding frames to encLink)

                params.frameRate = xxx;--> Set the output fps you want the encoder to produce here

                params.targetBitRate = xxx -> Set corresponding bitrate for the specified frame rate

                Venc_setDynamicParam(chId, 0, &params, VENC_FRAMERATE);

Hi, Narayanan

I add these in my codec, place then after enclink start.

VENC_CHN_DYNAMIC_PARAM_S params;

memset(&params, 0, sizeof(params));
params.frameRate = 25;
params.targetBitRate = 5000000;

Venc_setInputFrameRate(0, 25);
Venc_setDynamicParam(0, 0, &params, ENC_FRAMERATE);

however, it seems not work, the out fps still 30.

Is DVRRDK 3.0 support change fps when encode interlace data?

Hi, Narayanan

I use API Venc_getDynamicParam to get encode dynamic param, the frame rate equal to the value i set. 

however, when i use tools to get fps, it is still 30 fps.

Can you provide some suggesions for me? Ths~

Can you analyze the stream to check if timingInfo VUI parameters are present in the stream . If they are not present player may be assuming 30 fps by default.

Hi, Narayanan

 the vui_parameters_present_flag equal 0. 

Pls check if the following changes are present in your codebase:

/dvr_rdk/mcfw/src_bios6/links_m3video/iva_enc/encLink_h264.c

1.#define ENCLINK_H264_SETNALU_MASK_SPS(naluMask) ((naluMask) |= (1 << IH264_NALU_TYPE_SPS_WITH_VUI))

2.enclink_h264_set_static_params()

    staticParams->vuiCodingParams.timingInfoPresentFlag = 1;

The SPS should have VUI.

Hi ,Narayanan

I can find both of them in encLink_h264.c.

Are you checking the SPS for VUI info ? Pls check the IDR frame after you set the frame rate. Can you try setting

    staticParams->vuiCodingParams.vuiCodingPreset = IH264_VUICODING_DEFAULT;

and see if it makes any difference

Hi, Narayanan

I set  staticParams->vuiCodingParams.vuiCodingPreset = IH264_VUICODING_DEFAULT in enclink_h264_set_static_params function, there is no difference than before.

Hi Narayanan

The SPS have no VUI info because of vui_parameters_present_flag equal 0.

what's the mean of  "check the IDR frame after you set the frame rate"? 

Hi Narayanan

I use tools to check the encoded bitstream, all I-Frames not an IDR-Frame, except for the first I-frame.

I find that 

• IDRFrameInterval is set to 1 (dvr_rdk/mcfw/src_bios6/links_m3video/iva_enc/encLink_h264.c )

What should i do next, can you give me some suggustion? Ths~

Hi Narayanan

I set encodingPresent in my codec.

      encPrm.chCreateParams[i].encodingPreset = XDM_USER_DEFINED;//XDM_DEFAULT;

I also set  vuiCodingPreset in  enclink_h264.c 

      staticParams->vuiCodingParams.vuiCodingPreset = IH264_VUICODING_USERDEFINED;// IH264_VUICODING_DEFAULT;//
      staticParams->vuiCodingParams.hrdParamsPresentFlag = 1;
      staticParams->vuiCodingParams.timingInfoPresentFlag = 1; // 1

 the framerate can change now.

Thank you very much. ~.~