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• trying to use fluent-ffpmeg on raspberry pi

  3 septembre 2018, par cdoern

  I am trying to use fluent ffmpeg to make a h264 file into an mp4 file. However, installing regular ffmpeg did not work since ti downloaded a very old version onto my pi. through some research i stumbled upon an ffmpeg installer on npm that installers a newer version and allows you to use it : https://www.npmjs.com/package/@ffmpeg-installer/ffmpeg however, when incorporating this into my project, PM2, the process manager I am using to run my files, throws a very stranger error :

  err._length = err.length;
TypeError: Cannot create property '_length' on string 'Unsupported platform/architecture: linux-arm

  below is my code for converting the file

  const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
  
  var ffmpeg = require('fluent-ffmpeg');
  
  ffmpeg.setFfmpegPath(ffmpegPath);
  
  ffmpeg('/home/pi/Videos/video.h264').format('mp4');
  
  ffmpeg.on('error', function(err) {
  
    console.log('an error happened: ' + err.message);
  
  })
  
  // save to file
  
  ffmpeg.save('/home/pi/Videos/testmovie.mp4');

• Using C# and ffmpeg to rip audio from an .mp4, ffmpeg stuck until closing the calling application

  19 juillet 2018, par user3806186

  I happened to find this answer :
  https://stackoverflow.com/questions/44981454/c-sharp-extract-mp3-file-from-mp4-file#=

  And it seems to work, However, the conversion process gets stuck, and it only resumes after I have closed the application that called ffmpeg to run.

  The following code is responsible for the launch of ffmpeg :
  (The commented lines are just from testing on how to fix the hanging)

          public static string ConvertToMp3(string inputFile, string outputFile = "extracted_audio.mp3")
  
      {
  
          Console.WriteLine("Converting mp3 to " + Path.GetFullPath("extracted_audio.mp3"));
  
          string mp3out = "";
  
  
  
          try
  
          {
  
              if (ffmpegProcess != null)
  
                  ffmpegProcess.Kill();
  
  
  
              ffmpegProcess = new Process();
  
              ffmpegProcess.StartInfo.UseShellExecute = false;
  
              ffmpegProcess.StartInfo.RedirectStandardInput = true;
  
              ffmpegProcess.StartInfo.RedirectStandardOutput = true;
  
              ffmpegProcess.StartInfo.RedirectStandardError = true;
  
              ffmpegProcess.StartInfo.CreateNoWindow = true;
  
              ffmpegProcess.StartInfo.FileName = Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName) + @"\bin\ffmpeg.exe";
  
              ffmpegProcess.StartInfo.Arguments = "-i " + Path.GetFullPath(inputFile) + " -vn -f mp3 -ab 320k output " + Path.GetFullPath(outputFile);
  
              ffmpegProcess.Start();
  
              ffmpegProcess.StandardOutput.ReadToEnd();
  
              mp3out = ffmpegProcess.StandardError.ReadToEnd();
  
              //ffmpegProcess.WaitForExit();
  
              if (!ffmpegProcess.HasExited)
  
              {
  
                  //ffmpegProcess.Kill();
  
              }
  
          }
  
          catch (InvalidOperationException e)
  
          {
  
              Console.WriteLine("mp3 conversion failed: " + e.Message);
  
              return "";
  
          }
  
  
  
          return mp3out;
  
      }

  I have no idea what causes the halting, any ideas ?

• How to use Intel QSV record screen based on ffmpeg

  18 octobre 2020, par zonda

  I want to record my screen with ffmpeg.
  
I succeeded in the normal way.
  
ffmpeg -f gdigrab -framerate 30 -draw_mouse 1 -i desktop -c:v h264 -r 30 -preset ultrafast -tune zerolatency -pix_fmt yuv420p "record.mp4"

  



  But I want use GPU record my screen now.
  
I'm trying to use Intel QSV on ffmpeg.
  
ffmpeg -f gdigrab -framerate 30 -draw_mouse 1 -i desktop -c:v h264_qsv -r 30 -tune zerolatency -pix_fmt yuv420p "record.mp4"

  



  It does not work and show :
  
[h264_qsv @ 0000000000479080] Error initializing the encoder: invalid video parameters (-15)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

I don't know what happened.

  



  And I'm trying simple way.
  
ffmpeg -i test_input.mp4 -c:v h264_qsv -preset:v faster test_output.mp4
  
It does not work too.

  



  My computer information :
  
acer notebook : TravelMate P243-MG
  
OS : windows 7 64bits
  
CPU : Intel i5-3210M
  
Graphics card : Nvidia GT-630M

  



  Thanks in advance !