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• how to use x264 dll in another project

  5 août 2014, par Hadi Rasekh

  enter code here I want to use x264 in my project. There is some line in the code said :

  /* Application developers planning to link against a shared library version of
* libx264 from a Microsoft Visual Studio or similar development environment
* will need to define X264_API_IMPORTS before including this header.
* This clause does not apply to MinGW, similar development environments, or non
* Windows platforms. */

  But I don’t get this line :
  define X264_API_IMPORTS before including this header

  We can create x264 dll by its configuration and make

      ./configure --enable-shared
  
      make

  but I can not use the dll in my Qt Project.

  I can make my own dll (in another code) and use it in the project.
  But when I start to use x264 dll in my project I get the following error :

      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
  
      'pulldown_frame_duration' was not declared in this scope
  
      qDebug() << pulldown_frame_duration[1];
  
               ^

• 3 seconds latency while streaming with Wowza Server

  18 mai 2015, par kaizen_labs

  I’m trying to develop a live streaming application with RTSP protocol.

  On the PC with the Wowza Server, I execute the following command :

  Code :

  ffmpeg -f dshow -i video="Name_Of_My_Cam":audio="Name_Of_My_Microphone" -vcodec
  
  h263p -f rtsp -muxdelay 0.1 rtsp://:1935/live/test

  And I’m trying to play this stream on a VideoView on my Samsung Galaxy Note 3 Lite. Here is the code :

  @Override
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
  
  
      VideoView vv = (VideoView) findViewById(R.id.videoView);
  
      // Receive RTSP video from Wowza Server
  
      vv.setVideoURI(Uri.parse("rtsp://:1935/live/test"));
  
      vv.requestFocus();
  
      vv.start();
  
  }

  I managed to read the video and the sound but it makes 3 secondes (or more...) to start and I keep this delay during all the streaming. It is very annoying because I want to develop a call session.

  Does anybody know how to reduce this delay ? Is it a Wowza issue ?

• Converting H265 to MP4 Using FFMPEG and GPU

  1er mars 2019, par Carlos Dieste

  I am trying to convert a video ouput from a camera to MP4 but it is using too much CPU (However we can not limit the program as we need this to be done fast) so we thought using some GPU might be an option.

  At the moment we were using this so far :

  ffmpeg.exe -i "old.mkv" "new.mp4"

  Tried using :

  ffmpeg.exe -hwaccel cuvid  -i "old.mkv" "new.mp4"

  However it throws an error :

  "Pixel format 'yuvj420p' is not supported"

  There is nothing I can do with the video input but I am looking for alternatives to reduce CPU use.

  The video encode is HEVC.

  I thought GPU might be a good idea but this seems to be incompatible with the video input.

  Any ideas of how to make ffmpeg run on GPU or alternatives for lowering the CPU usage ?