Recherche avancée

Sur d’autres sites (8313)

• How to synchronize HLS and/or MPEG-DASH videos on multiple clients using ExoPlayer ?

  22 mai 2019, par G C

  I’m trying to guarantee synchronization between multiple clients using DASH and/or HLS. Synchronization between each client must fall within 40 milliseconds.

  Live streaming seems to be an obvious choice. However, the only way to really get within a small time frame of synchronization would be to lower the segment times. Is this the only viable solution ? Are there any tags that would help me keep clients within 40 milliseconds to the live time ?

  Currently, I’m using FFMPEG to encode video and audio to live content.

• RTMP video streaming client without showing the video just need extensive log

  6 août 2016, par Amir

  I set up an RTMP video streaming server in a cloud environment for research purposes. On another VM in the cloud, I want to use a client to do some experiments. I have tried some different video player like VLC and FFplay but they are keep playing the video in the shell. As it is in the command line environment and to make sure my experiments are not biased with human errors, I need an RTMP video streaming client that just receives the stream as if it wanted to play it and log everything, for instance, if the playback stops due to buffering, average buffer size, etc.

  Thanks

• Executing bash shell command and extract output —> invalid file error

  29 novembre 2016, par Ingeborg

  I want to extract the framesize of a video from a file. For this purpose, I have launched an ffmpeg command via bash shell, and I want to extract the output. This command is working well in the bash shell, and returns the output as wanted.

  ffprobe -v error -count_frames -of flat=s=_ -select_streams v:0 -show_entries stream=nb_read_frames /home/peter/DA/videos/IMG-2014-1-10-10-4-37.avi

  I want to call it via C++ and read out the result. I use the IDE Qt 4.8.6 with GCC 4.8 compiler.

  For my code, I use this template :

  executing shell command with popen

  and changed it for my demands to

  #include <iostream>
  
  #include <string>
  
  #include 
  
  
  
  using namespace std;
  
  
  
  
  
  int main()
  
  {
  
     FILE* pipe = popen("echo $(ffprobe -v error -count_frames -of flat=s=_ -select_streams v:0 -show_entries stream=nb_read_frames /home/peter/DA/videos/IMG-2014-1-10-10-4-37.avi)", "r");
  
   if(!pipe)
  
   {
  
       cout &lt;&lt; "error" &lt;&lt; endl;
  
       return 1;
  
   }
  
   char* buffer = new char[512];
  
  
  
  string result;
  
  fgets(buffer, sizeof(buffer), pipe) ;
  
  while(!feof(pipe))
  
  {
  
      if(fgets(buffer, sizeof(buffer), pipe) != NULL)
  
      {
  
          cout &lt;&lt; buffer &lt;&lt; endl;
  
          result += buffer;
  
      }
  
  }
  
  pclose(pipe);
  
  cout &lt;&lt; result&lt;&lt; endl;
  
  return 0;   
  
  }
  
  </string></iostream>

  The Qt console returned me this warning, and it is rending with return 0 :

  /home/peter/DA/videos/IMG-2014-1-10-10-4-37.avi: Invalid data found when processing input

  and "pipe" is empty.

  When I compile the main.cpp file above with g++ in the shell it works nice too.