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• MP4BOX- postfix BaseURL name in mpd file

  10 novembre 2015, par user755

  I have generated mpd files successfully. however, I would like to change the BaseURL under Representation element.

  Below command MP4Box generates Q1_Video_10000_dashinit.mp4 as BaseURL,infact I’d like to change Q1_Video_10000_tsxx.mp4

  MP4Box -dash 5000 -frag 5000 -rap -bs-switching merge -out testvideo.mpd \
   Q1_Video_10000.mp4

  I want to rename the postfix "_dashinit" to some userdefine string.

• RGB to x264 : Strange color render

  16 janvier 2014, par Maypeur

  i’m trying to make a video from an OpenGl context.

  I’m Using glReadPixel, to be sure RGB buffer data is Ok i save it into a bmp file, wich i can read correctly.

  My .h264 video is encoded but there are some artefact and i don’t understand why.
  I tried a lot of different parameters for the x264_param_t but anything better !

  Bitmap saved (OpenGL real data) : Bitmap from OpenGl (1mo)

  Raw h264 with error : Raw h264 video (1mo)

  OpenGl ReadPixel :

  int nSize = ClientHeight * ClientWidth * 3;
  
  GLubyte *inBuff = new GLubyte[nSize];
  
  glReadBuffer(GL_FRONT);
  
  glReadPixels(0, 0, ldwidth, ldheight, GL_BGR, GL_UNSIGNED_BYTE, inBuff);

  The params define :

  x264_param_default(&mX264_param_t);
  
  x264_param_default_preset(&mX264_param_t, "placebo", "film");
  
  
  
  mX264_param_t.i_csp = X264_CSP_BGR;
  
  mX264_param_t.i_threads = 6;
  
  mX264_param_t.i_width = mWidth;
  
  mX264_param_t.i_height = mHeight;
  
  
  
  mX264_param_t.i_fps_num = mFps;
  
  mX264_param_t.i_fps_den = 1;
  
  
  
  // Intra refres:
  
  mX264_param_t.i_keyint_max = mFps;
  
  mX264_param_t.b_intra_refresh = 1;
  
  
  
  //Rate control:
  
  mX264_param_t.rc.i_rc_method = X264_RC_CRF;
  
  mX264_param_t.rc.f_rf_constant = 25;
  
  mX264_param_t.rc.f_rf_constant_max = 35;
  
  
  
  int bps = 5000;
  
  mX264_param_t.rc.i_bitrate = bps;
  
  mX264_param_t.rc.i_vbv_max_bitrate = bps;
  
  mX264_param_t.i_bframe = 2;
  
  mX264_param_t.i_keyint_min = mFps / 4;
  
  //For streaming:
  
  mX264_param_t.b_repeat_headers = 1;
  
  mX264_param_t.b_annexb = 1;
  
  mX264_param_t.i_log_level = X264_LOG_DEBUG;
  
  x264_param_apply_profile(&mX264_param_t, "baseline");
  
  
  
  mpEncoder = x264_encoder_open(&mX264_param_t);
  
  x264_encoder_parameters(mpEncoder, &mX264_param_t);
  
  
  
  
  
  
  
  mpPictureOut = new x264_picture_t();
  
  mpPictureIn = new x264_picture_t();
  
  
  
  x264_picture_alloc(mpPictureIn, X264_CSP_BGR | X264_CSP_VFLIP, mWidth, mHeight);

  Then the encoding loop :

  mpPictureIn->img.i_csp = X264_CSP_BGR;
  
  
  
  mpPictureIn->img.i_plane = 1;
  
  mpPictureIn->img.i_stride[0] = 3 * mWidth;
  
  mpPictureIn->img.plane[0] = rgbframe;
  
  
  
  mpPictureIn->i_pts = mFrameCount;
  
  mpPictureIn->i_type = X264_TYPE_AUTO;
  
  
  
  mpPictureOut->i_pts = mFrameCount;
  
  
  
  int i_nals;
  
  x264_nal_t* nals;
  
  int frame_size = x264_encoder_encode(mpEncoder, &nals, &i_nals, mpPictureIn, mpPictureOut);
  
  
  
  if(frame_size > 0)
  
  {
  
  mpFileOut->write_frame(nals[0].p_payload, frame_size, mpPictureOut);
  
  mFrameCount++;
  
  }

  The write frame :

  int TVideoFileWriter::write_frame(uint8_t *p_nalu, int i_size, x264_picture_t *p_picture)
  
  {
  
  if(fwrite(p_nalu, i_size, 1, mFileHandle))
  
      return i_size;
  
  return -1;
  
  }

• Threads creating process in infinite loop

  10 décembre 2013, par bhupinder

  In my application a thread runs while(1){} in it so thread terminates when my app is terminated by user.

  Is it safe to do like this ? I am using while(1){} because my app continuously monitors devices on system.

  After some time I am getting "(R6016) not enough space for thread data" on ffmpeg.

  I read this but did not get solution of my problem :

  http://support.microsoft.com/kb/126709

  Thread description :
  Thread uses ffmpeg and handle utility (http://technet.microsoft.com/en-us/sysinternals/bb896655.aspx). within while(1){} loop.

  ffmpeg and handle is running through QProcess which I am deleting after process ends.

  while(1){} loop waits for 5 seconds using
  msleep(5000).