Runtime Parameter Configuration

Manu,

most likely parameters are not correct and it returns errors. Which indices you are using to change the parameters. OMX_VENC wiki shows examples to change the parameters.

Regards

Vimal

http://processors.wiki.ti.com/index.php/OMX_VENC

Vimal,

Thank you for showing interest in solving this issue. I'll try to be more specific. I've now tried changing bitrate and GOP size at runtime. I've found that these changes are taking effect. But when I try to change QP settings on similar lines, the encoder hangs at the point where I change them. For eg. if I change them after 10 frames, the encoder runs fine till 10 frames are encoded and hangs after that. If I keep my QP settings same as that at init time the encoder works properly. My question now is whether changing QP settings during runtime are supported and if yes, how ?

Regards,

Manu 

Manu,

please reefer to codec user guides for checking all static and dynamic parameters. Also which index are you using for changing parameter.

Regards

Vimal

Vimal,

Here is the code snippet where I'm facing problem. This function, present in ilclient.c file, has been modified as below .

The expected outcome is change in QP settings at runtime.

void IL_ClientOutputBitStreamWriteTask (void *threadsArg)
{
  unsigned int dataRead = 0, frame_counter = 0 ;
  OMX_ERRORTYPE err = OMX_ErrorNone;
  IL_CLIENT_COMP_PRIVATE *encILComp = NULL;
  OMX_BUFFERHEADERTYPE *pBufferOut = NULL;
 
  printf("\n\n Initialisation Done....\n\n");

  encILComp = ((IL_Client *) threadsArg)->encILComp;

  /* use the initial i/p buffers and make empty this buffer calls */
  err = IL_ClientEncUseInitialOutputResources (encILComp);

  printf("\n\n initial output resources function called...\n\n");

  while (1)
  {

            if(15 == frame_counter)                                                                                  // check if current frame number is 15
            {                                                                                                                           // if true, change QP settings to following 
                                  OMX_ERRORTYPE eError = OMX_ErrorNone;

                                  OMX_VIDEO_CONFIG_QPSETTINGSTYPE s_dyn ;

                                  IL_Client *pAppData = NULL;

                                  pAppData = gpAppData_val ;

                                  OMX_INIT_PARAM (&s_dyn);

                                  s_dyn.nPortIndex      = OMX_VIDENC_OUTPUT_PORT;

                                  eError = OMX_GetConfig(gpAppData_val->pEncHandle,
                                                         OMX_TI_IndexConfigVideoQPSettings,
                                                         &s_dyn);

                                        s_dyn.nQpI      = 38 ; // 36       // initial settings are commented
                                        s_dyn.nQpMaxI   = 38 ; // 36
                                        s_dyn.nQpMinI   = 40 ; // 36
                                        s_dyn.nQpP      = 38 ; // 36
                                        s_dyn.nQpMaxP   = 38 ; //36
                                        s_dyn.nQpMinP   = 40 ; //36
                                        s_dyn.nQpOffsetB = 4 ; // 4
                                        s_dyn.nQpMaxB   = 26 ; // 26
                                        s_dyn.nQpMinB   = 51 ; // 51

                                  eError = OMX_SetConfig(gpAppData_val->pEncHandle,
                                                         OMX_TI_IndexConfigVideoQPSettings,//OMX_TI_IndexParamVideoDynamicParams,
                                                         &s_dyn);
                                  if(eError != OMX_ErrorNone)
                                  {
                                         printf("\n Error in OMX_SetConfig: %x\n", eError);
                                  }
                                  else
                                  {
                                         printf("\n Success in OMX_SetConfig \n");
                                  }
            }

    /* Read filled buffer pointer from the pipe */
    read (encILComp->outPortParams->opBufPipe[0],
          &pBufferOut, sizeof (pBufferOut)); 
   
    /* write data to output file */
    fwrite (pBufferOut->pBuffer,
            sizeof (char),
            pBufferOut->nFilledLen, ((IL_Client *) threadsArg)->fOut);

    fflush(((IL_Client *) threadsArg)->fOut);
 
    frame_counter++;
 
    if((frame_counter == encILComp->numFrames) || (g_EXIT_TASK == 1))
    {
       printf(" write task exited \n");
       semp_post(encILComp->eos);
       pthread_exit(NULL);
       break;
    }
    
    
    /* Pass the input buffer to the component */
    err = OMX_FillThisBuffer (encILComp->handle, pBufferOut);
 
    if (OMX_ErrorNone != err)
    {
       /* put back the frame in pipe and wait for state change */
       write (encILComp->outPortParams->opBufPipe[1],
              &pBufferOut, sizeof (pBufferOut));
       printf (" waiting for action from IL Client \n");
 
       /* since in this example we are changing states in other thread it will
          return error for giving ETB/FTB calls in non-execute state. Since
          example is shutting down, we exit the thread */
 
       pthread_exit (encILComp);
 
    }
 
   }
 
 }

 The encoder application was run in cbr mode ( rateControlPreset =  IVIDEO_LOW_DELAY). As explained in my earlier post, the encoder stops working after 14 frames. This is happening only when I change QP from initial settings. Also in constant QP mode, ( rateControlPreset = IVIDEO_NONE) , same effect is seen when i change nQpI and nQpP(init_QP) which is evident from the way the modes consider QP settings. Please let me know if I'm using wrong parameters, settings, etc.

Regards,

Manu 

Vimal,

Thank you very much for the suggestion :) . I could successfully change QP settings using OMX_TI_IndexParamVideoDynamicParams omx index !

Regards,

Manu

Hello Manu/Vimal,

I am facing similar kind of problem. I am doing similar QP Parameter settings in my IL Client encode application of ezsdk. It seems that my settings applied successfully but i am not getting any difference in encoded file. As far as my knowledge it will reflect at least size of file as on varying QP parameter settings.

Do i need to do any other settings other then this ?

Have you used same (OMX_VIDEO_CONFIG_QPSETTINGSTYPE) structure with OMX_TI_IndexParamVideoDynamicParams index or OMX_VIDEO_CONFIG_DYNAMICPARAMS structure and QP parameters available as part of OMX_VIDEO_CONFIG_DYNAMICPARAMS structure along with the OMX_TI_IndexParamVideoDynamicParams index ?

I am stuck here, Quicker response will be help me to move ahead.

Regards,

Hitesh

Hello Guys,

Any update on this ? Can anyone help me here..... ?

Regards,

Hitesh

Hello Guys,

I got the solution for this. Anyway, many thanks for all your support.

Regards,

Hitesh