OMX VENC dynamic resolution change

Steven Harris

Hi,

I have read all the OMX docs, including the H264 Encoder User Guide and cannot find a solution to this.

Is there a way to get the OMX VENC component to handle changes to the size of the input video frames dyamically?

The input/output port configuration cannot be changed once the component is in an executing state.

Input video is captured at 1080p. So the VENC buffers and input/output ports are configured for 1080p and this works fine. However, the input might then be re-scaled to 720p or D1 by the DEI component. This is given to the VENC component but the video comes out corrupted.

I have tried setting the VENC dynamic params as follows but this does not work:

tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.inputWidth = 1280;

tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.inputHeight = 720;

tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.captureWidth = 1280;

Is there any way to get the VENC to handle size changes? I have access to the overlay code if there are any changes needed in there?

Thanks,

Steven

over 12 years ago

0 Steven Harris over 12 years ago

Expert 1160 points

This is what the image looks like when I change the size.

Any ideas what the problem is?

What stride value should I be using?

Steven

0 Steven Harris over 12 years ago in reply to Steven Harris

Expert 1160 points

Hi,

Can someone from TI please comment. We need urgent support on this.

Thanks,

Steven

0 Steven Harris over 12 years ago in reply to Steven Harris

Expert 1160 points

Hi,

Can someone at TI URGENTLY respond to this please. I need support on this.

Thanks,

Steven

0 Steven Harris over 12 years ago in reply to Steven Harris

Expert 1160 points

Here is the function I am using that does not work:

OMX_ERRORTYPE IL_ClientUpdateVENCResolution(IL_Client *pAppData, int width, int height)
{
  OMX_ERRORTYPE eError=OMX_ErrorNone;
  OMX_HANDLETYPE pHandle=pAppData->pEncHandle;
  OMX_VIDEO_CONFIG_DYNAMICPARAMS tDynParams;
  OMX_CONFIG_VIDCHANNEL_RESOLUTION chResolutionNew;

  int captureWidth, captureHeight;
  captureWidth = pAppData->nWidth;
  captureHeight = pAppData->nHeight;

  OMX_INIT_PARAM (&chResolutionNew);
  chResolutionNew.Frm0Width = captureWidth;
  chResolutionNew.Frm0Height = captureHeight;
  chResolutionNew.Frm0Pitch = chResolutionNew.Frm0Width * 2;
  chResolutionNew.Frm1Width = width;
  chResolutionNew.Frm1Height = height;
  chResolutionNew.Frm1Pitch = width;
  chResolutionNew.FrmStartX = 0;
  chResolutionNew.FrmStartY = 0;
  chResolutionNew.FrmCropWidth = 0;
  chResolutionNew.FrmCropHeight = 0;
  chResolutionNew.eDir = OMX_DirOutput;
  chResolutionNew.nChId = 0;

  eError = OMX_SetConfig (pAppData->pDeiHandle,
                          (OMX_INDEXTYPE) OMX_TI_IndexConfigVidChResolution,
                          &chResolutionNew);
  if (eError != OMX_ErrorNone)
  {
      ERROR ("FAILED TO RECONFIGURE DEI -> VENC SCALE\n");
  }
  printf( "RECONFIGURED DEI OUTPUT TO VENC\n" );

  OMX_INIT_PARAM (&tDynParams);
  tDynParams.nPortIndex = OMX_VIDENC_OUTPUT_PORT;

  eError = OMX_GetParameter(pHandle,OMX_TI_IndexParamVideoDynamicParams,&tDynParams);
    if(eError!=OMX_ErrorNone)
        NetLogf(pLog,"DYNAMIC PARAMS Request Error %i",eError);

  tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.inputWidth = width;
  tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.inputHeight = height;
  tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.captureWidth = width;
  eError = OMX_SetConfig(pHandle,OMX_TI_IndexConfigVideoDynamicParams,&tDynParams);
    if(eError!=OMX_ErrorNone)
        NetLogf(pLog,"DYNAMIC PARAMS Request Error %i",eError);

    printf( "VENC DYNAMIC PARAMS UPDATED!!!!!\n" );

    return eError;
}

0 Ramprasad over 12 years ago in reply to Steven Harris

TI__Mastermind 30480 points

Hi Steven,

With same function, I am able to change the encoder resolution and it is taking the effect.

Are you using EZSDK 05.05.02.00? I could use this with this version.

Thanks

Ram

0 Steven Harris over 12 years ago in reply to Ramprasad

Expert 1160 points

Hi Ram,

Yes I am using v5.05.02.00.

Are you using the capture-encode sample?

Can you upload your code? If not then I can give you an email address to send it to.

Thanks,

Steven

0 Ramprasad over 12 years ago in reply to Steven Harris

TI__Mastermind 30480 points

Please share your email address

Ram

0 Steven Harris over 12 years ago in reply to Ramprasad

Expert 1160 points

Hi Ram,

My email address is steven dot harris at digitalbarriers dot com

Thanks,

Steven

0 Steven Harris over 12 years ago in reply to Steven Harris

Expert 1160 points

Hi Ram,

Having run the code you provided I found the following lines of code in IL_ClientProcessPipeCmdETB:

  /* For a proper chroma offset setting */
  if(gEncILComp == thisComp)
  {
    pBufferIn->nFilledLen = org_size;
  }

org_size is being set during initialisation as follows:

  org_size = pAppData->nWidth * pAppData->nHeight * 3 / 2;

Using this along with my function produces the correct image when the VENC input size is changed.

Thanks, Steven

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OMX VENC dynamic resolution change