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• Different results between windows and Linux in opencv c++

  24 mars 2020, par Samer

  I have tried this opencv and ffmpeg C++ code to demux a video and edit it and mux it back again but it doesn’t seem to work properly on windows (using Visual Studio)

  the problem occurs by skipping some frames especially at the end of the video and increasing the video output size not on all windows PCs. We have tried it on a 35 MB video and when we did the editing the output video size was 2.8GB on some windows PCs and the last frames skipped (the problem) and some other PCs the output video size was 500MB and there were no skipped frames (all fine).

  so the question is, why would the same code with the same build and windows versions behave differently and produce problems on some Pcs ?

  (we also did it on linux ubuntu and macos and it was working fine on different PCs)

  https://github.com/WajdiMuh/parallelalgo for the files

  https://gjuedujo-my.sharepoint.com/personal/m_albizreh1_gju_edu_jo/_layouts/15/onedrive.aspx?id=%2Fpersonal%2Fm%5Falbizreh1%5Fgju%5Fedu%5Fjo%2FDocuments%2FParallel%20Project%2Fbinr&originalPath=aHR0cHM6Ly9nanVlZHVqby1teS5zaGFyZXBvaW50LmNvbS86ZjovZy9wZXJzb25hbC9tX2FsYml6cmVoMV9nanVfZWR1X2pvL0VzaHFWNDJCVThkQ25KOFV0dm82NHJNQmdoOWdCeEZOblkwQWtRMkQ0MU5UV3c_cnRpbWU9TTl4Zi1YblAxMGc for the release version (vidd.MP4 is the video)

  Thanks in Advance

• FFMPEG on Linux (Mono)

  28 novembre 2016, par Paulo Anjos

  I’m creating a Discord Bot and I’m using Dot.Net. So I downloaded the necessary libs (ffmpeg and opus [for Discord]) and I’m running the .exe with Mono.

  I’m downloading a video file (mp4) and using FFMPEG to adjust the audio (16-bit, 48000Hz, PCM, 2 channels) and send it to the Discord Channel.

  It works fine on Windows but it refuses to on Linux (Ubuntu 14.04).
  It justs hangs and doesn’t do anything else like
  this image shows.

  Same .exe but in Windows now (to compare if needed) : image link

  I thought it was something with my Virtual Private Server but the same problem occured with my local Ubuntu 14.04 virtual machine.

  Code to send the song to Discord (Dot.Net) :

  async public void playAudio(Music m)
  
  {
  
      string path = "mp4" + Path.DirectorySeparatorChar + m.videoid + ".mp4";
  
      Process mProcess = Process.Start(new ProcessStartInfo
  
      {
  
          FileName = "ffmpeg",
  
          Arguments = //"-loglevel quiet " +
  
          "-i " + (char)34 + path + (char)34 + " " +
  
          "-f s16le -ar 48000 -ac 2 pipe:1",
  
          UseShellExecute = false,
  
          CreateNoWindow = false,
  
          RedirectStandardOutput = true, //stdout of the process
  
          RedirectStandardError = false,
  
          Verb = "runas"
  
      });
  
      while (!Utils.isRunning(mProcess)) { await Task.Delay(500); }
  
  
  
      while (true)
  
      {
  
          int blockSize = 3840;
  
          byte[] buffer = new byte[blockSize];
  
          int byteCount;
  
          byteCount = mProcess.StandardOutput.BaseStream.Read(buffer, 0, blockSize);
  
          if (byteCount == 0)
  
              break;
  
          if (stop_music)
  
              break;
  
          bot_audio.Send(buffer, 0, byteCount); //Send to Discord
  
      }
  
      ...
  
  }

  I find a little odd the libavresample   3.  1. 0 / 3.  1. 0 at the image (missing lib maybe ?).

  Any thoughts ?

• How to install ffmpeg in linux centos via cpanel [on hold]

  29 novembre 2015, par Mourad karoudi

  I want to install ffmpeg in my server (work with cpanel)
  but in don’t have any idea to do this.
  please help me