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• Reduce Bandwidth requirement for Video Streaming

  19 février 2014, par user3239282

  Please suggest some points on, how to reduce the bandwidth requirement for a video stream.

  We are actually streaming the desktop across internet, Remote Access Application.

  Encoder : libx264.lib

  Decoder : Ffmpeg

  Codec : H264

  Following is how am configuring h264 for encoding :

      x264_param_default_preset(&this->m_x264Settings, "veryfast", "zerolatency");
  
      this->m_x264Settings.i_threads = 1;
  
      this->m_x264Settings.i_width = width / 2;
  
      this->m_x264Settings.i_height = height / 2;
  
      this->m_x264Settings.i_keyint_max = 10;//fps;
  
      this->m_x264Settings.b_intra_refresh = 1;
  
      this->m_x264Settings.i_fps_num = 10;
  
      this->m_x264Settings.i_fps_den = 1;
  
      // Intra refres:
  
      this->m_x264Settings.i_keyint_max = 25;
  
      this->m_x264Settings.b_intra_refresh = 1;
  
      //Rate control:
  
      this->m_x264Settings.rc.i_rc_method = X264_RC_CRF;
  
      this->m_x264Settings.rc.f_rf_constant = 25;
  
      this->m_x264Settings.rc.f_rf_constant_max = 35;
  
  
  
      //For streaming:
  
      this->m_x264Settings.b_repeat_headers = 1;
  
      this->m_x264Settings.b_annexb = 1;
  
      x264_param_apply_profile(&this->m_x264Settings, "baseline");
  
  
  
      this->m_width = width;
  
      this->m_height = height;
  
      this->m_encoder = x264_encoder_open(&this->m_x264Settings);
  
      x264_picture_alloc(&this->m_picIn,X264_CSP_I420,(width / 2),(height / 2));
  
      int sws_flags = SWS_BICUBIC;
  
      m_imgConverCtx = sws_getContext(width, height, PIX_FMT_RGB32, (width/2), (height/2), PIX_FMT_YUV420P,sws_flags, NULL, NULL, NULL);

  Thanks in advance,
  Paul.

• init seg_duration option for dash similar to -hls_init_time option

  5 août 2019, par Saurabh

  Is there any option to set first segment duration for dash files, There is similar option for HLS : hls_init_time ?

  I could not found any such option in documentation.

  ---

  Why I want such option to be there :

  From generated DASH files : in Android ExoPlayer, It always plays first chunk of lowest quality(bitrate/resolution), after first chunk, basis user’s internet speed, it picks the next chunk. If there is no init_seg_duration option, I have to rely only on seg_duration and I can not keep it bit large. Why I will like to keep it large : to reduce the number of files generated.

  With such option, I could had given -init_seg_duraion 2 -seg_duration 6, so video quality would had increased after 2 seconds and total number of files generated would also not had exploded.

• How we can replace all images with another in video using FFMPEG library ?

  17 juin 2020, par Parth Virani

  Challange

  



  i had search many things on internet for do this above function but still i can't able to make it hear i have attached before video and after video which i want using ffmpeg library

  



  Before Video : https://drive.google.com/file/d/1MIUtuOkw22BiyFTKanDeio-VzYS5vKmn/view?usp=sharing

  



  After Video : https://drive.google.com/file/d/1Vot237PcDPA5BqnLRHlQ1ierYrLIyUj9/view?usp=sharing

  



  keep one thing in mind i only need to change images only the text,effects and sound should be as it as