Recherche avancée

Sur d’autres sites (4930)

• HTML5 video (mp4) won't seek properly with Firefox 37/38/39 on Apache

  10 juin 2015, par degenerate

  Edit : Turns out this is actually a Firefox bug.

  Firefox will not seek properly past the loaded point in any mp4. It doesn’t matter what program encoded the file or where it came from ! I am hosting on Apache 2.2.29

  Obvious things you will probably ask me :

  • Yes I used -movflags faststart when encoding with ffmpeg
  • Yes AddType video/mp4 .mp4 is set correctly
  • This is a new problem without any changes to the server ; only the newer firefox (version 36, 37, 38+) has this issue.
  • Chrome works WONDERFULLY so this is a problem isolated to Firefox, and only started happening sometime in 2015 with one of the newer versions. Nothing was changed on the server.

  Firefox makes hundreds of requests after seeking to any point in the mp4. The closer to the end of the file, the more requests are made. Eventually after several minutes it will stop sending requests and finish playing ; I assume when this happens it has downloaded the entire mp4.

  Notice the byte-range request on chrome has a definitive size, yet all the requests one firefox are XXXXXX- with no ending byte...

  (FIREFOX = BAD, hundreds of requests — right click image to see full resolution)

  

  (CHROME = GOOD, one single request)

  

  Regarding keep-alives : I tried turning keepalive on and off. I get the same results in both browsers. Chrome is always able to seek, firefox is never able to seek.

• Only 1 process is showing activity parallel foreach

  18 janvier 2018, par TheHappyGuy

  So I am using a Parallel.Foreach because I want to start 4 unique processes that does essentially the same thing. Watermarks a video.

  How it should work is that it should open 4 ffmpeg.exe and pass an argument to each window so it watermarks 4 videos at a time.
  However.. That’s not what is happening, It opens 4 processes but only 1 is active. Not sure if it’s trying to use the same one 4 times or what ever it could be but I need help.

  When I close the working process, the 3 non working ones are still there until I manually close them down.
  Here is a visual representation

  

  Here is a second image showing what happends when closing the working one

  

  Here is the code :

  public void Watermark()
  
      {
  
          Console.WriteLine("Please enter the directory with the mp4 files: ");
  
          string EntryPath = Console.ReadLine();
  
  
  
          //Console.WriteLine("Please enter the directory with the mp4 files: ");
  
          //string OutputPath = Console.ReadLine();
  
  
  
          var psi = new ProcessStartInfo();
  
          psi.WindowStyle = ProcessWindowStyle.Hidden;
  
          psi.FileName = "ffmpeg.exe";
  
          int i = 0;
  
  
  
          var videos = Directory.EnumerateFiles(EntryPath, "*.mp4");
  
          Parallel.ForEach(videos, new ParallelOptions { MaxDegreeOfParallelism = 4 },
  
              vid =>
  
              {
  
                  try
  
                  {
  
                      //Maybe those processes are trying to work on the same file and can't access it?
  
                      //It's probably better to use the event Exited than WaitForExit
  
                      psi.Arguments = $"-i {vid} -i watermarker.png -threads 4 -filter_complex \"overlay = 275:350\" C:\\Users\\Developer\\Desktop\\Eh\\Watermarked{i}.mp4";
  
                      var p = Process.Start(psi);
  
                      p.WaitForExit();
  
  
  
                      Console.WriteLine($"{vid} is watermarked");
  
                      i++;
  
                  }
  
                  catch (Exception)
  
                  {
  
                      Console.ForegroundColor = ConsoleColor.Red;
  
                      Console.WriteLine("Error parsing that file");
  
                      Console.ForegroundColor = ConsoleColor.White;
  
                  }
  
  
  
              });
  
          Console.ReadLine();
  
  
  
      }

• fluent-ffmpeg failed with zero output or errors

  5 décembre 2023, par dcprime

  I'm attempting to convert a .webm audio file to a .wav audio file using fluent-ffmpeg. I've looked through all kinds of example code, but whenever I run my code I get no output or errors whatsoever :

  


  import ffmpeg from 'fluent-ffmpeg';

function verifyAudio({ testFile }) {

    // parse file name for wav file from testFile
    const wavFile = testFile.split('.')[0] + '.wav';
    console.log(`wavFile: ${wavFile}`);

    // convert to wav file
    ffmpeg(testFile)
        .inputFormat('webm')
        .outputFormat('wav')
        .on('start', function(commandLine) {
            console.log('Spawned Ffmpeg with command: ' + commandLine);
        })
        .on('progress', (progress) => {
            console.log('Processing: ' + progress.targetSize + ' KB converted');
        })
        .on('end', function(err) {
            console.log('done!', err);
        })
        .on('error', function(err) {
            console.log('an error: ' + err);
        }).saveToFile(wavFile);
    console.log('finished conversion');
}

export { verifyAudio };


  


  This function takes in the name of the input .webm file as an argument, and attempts to convert it to a .wav file with filename wavFile. When this runs, I see the output of console.log(wavFile : $wavFile);, I see the output of console.log('finished conversion');, but none of the .on outputs in the ffmpeg call. No errors are raised at all. Not even when I insert a non-existent filename as testFile. And no output file is generated (not even an empty one).

  


  I have no idea what's going on here, since I have no output to debug on ! What is happening here ?

  


  I've tried many combinations of defining inputs and outputs, including the various formats. I've tried doing the conversion on the command line using ffmpeg, it it works fine.

  


  I'm expecting to see the output file : A .wav file with the filename wavFile. I see nothing.