2 Replies Latest reply on Oct 2, 2015 12:06 AM by chenhua

    about lags of VCE h264 encoder

    chenhua

      I want to develop a remote gaming application using Media sdk. So i  transformed the dem project in vce sample into a live caputre&encoded program. The program was running on Windows 7, the remote part was a pc and running mplayer to display the 264 stream.

      After some testing,  i found some problems:

       

      1. sometimes the stream stalled for about several handred of micro seconds. function mEncoder->GetNextFrame(&buffer) took above 500ms. so we can seem apparently stalled picture for a while。

      2. the image captued has lags behind display.

       

      The configurate was as follow:

       

      //pconfig->usage = 4;   //low latency
          pconfig->usage = 2;   //wireless display
          pconfig->outputType = 3;   //for 264
          //pconfig->outputType = 2;   //for ts

          //pconfig->profile = 66;

          pconfig->profile = 100;

          pconfig->framesToEncode = 1000000;

       

          pconfig->width = 1920;

          pconfig->height = 1080;

       

          pconfig->bitRate = 20000000;

          pconfig->peakBitRate = 20000000;

       

          pconfig->idrPeriod = 6000;

          //pconfig->idrPeriod = 0;

          //pconfig->skippedPicPeriod = 1;

          pconfig->skippedPicPeriod = 0;

          pconfig->slicesPerFrame = 32;

       

          pconfig->intraRefreshMBperSlot = 360;

          //pconfig->intraRefreshMBperSlot = 0;

          pconfig->initialVBVbuffFullness = 0;

       

          pconfig->vbvBuffSize = 312500;

          pconfig->minQP = 0;

          pconfig->maxQP = 5;

       

      I also tried usage = 4 with no difference.

       

      Is that config correct? how to eliminate the lag?

      Thanks!