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• avcodec/htmlsubtitles : Replace very slow redundant sscanf() calls by cleaner and...

  11 juin 2017, par Michael Niedermayer

  avcodec/htmlsubtitles : Replace very slow redundant sscanf() calls by cleaner and faster code
  This reduces the worst case from O(n²) to O(n) time
  Fixes Timeout
  
  Fixes : 2127/clusterfuzz-testcase-minimized-6595787859427328
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/htmlsubtitles.c

• Backgroundworker quits itself and calls Runworkercompleted function

  5 mai 2017, par yjs990427

  I am using youtube-dl in a cmd process running in a backgroundworker process in wpf application to update its status to a text box asynchronously. There are times in my application that ffmpeg has to work in through the process. However, at the time that ffmpeg process is called (right after youtube-dl’s work is finished) and starts running, backgroundworker calls Runworkercompleted method and kills itself. ffmpeg is called from youtube-dl.

  Is there any fix that make the backgroundworker still work until the ffmpeg’s work is done ? Thanks.

  My DoWork method :

  private void downloadWorker_DoWork(object sender, DoWorkEventArgs e)
  
          {
  
              BackgroundWorker worker = sender as BackgroundWorker;
  
              Process process = new Process();
  
              string[] scripts = (string[])e.Argument;
  
  
  
              string dir = scripts[0];
  
              string scriptText = scripts[1];
  
  
  
              process.StartInfo.FileName = "cmd.exe";
  
              process.StartInfo.WorkingDirectory = dir;
  
              process.StartInfo.Arguments = "/C set path=%path%;" + System.AppDomain.CurrentDomain.BaseDirectory + "&" + scriptText;
  
              process.StartInfo.CreateNoWindow = true;
  
              process.StartInfo.UseShellExecute = false;
  
              process.StartInfo.RedirectStandardOutput = true;
  
              process.StartInfo.RedirectStandardInput = true;
  
              process.StartInfo.RedirectStandardError = true;
  
  
  
              process.Start();
  
  
  
              while (!process.StandardOutput.EndOfStream)
  
              {
  
                  if (downloadWorker.CancellationPending)   // if and only if user calls Abort
  
                  // would this if statement be the problem?
  
                  {
  
                      foreach (var youtube in Process.GetProcessesByName("youtube-dl"))
  
                      {
  
                          youtube.Kill();
  
                      }
  
                      process.Kill();
  
                      e.Cancel = true;
  
                      return;
  
                  }
  
                  else
  
                  {
  
                      string line = process.StandardOutput.ReadLine(); 
  
                      worker.ReportProgress(1, line);                  // reports its status to UI
  
                  }
  
              }
  
          }

  My RunWorkerCompleted method :

   private void downloadWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
  
          {
  
              if (e.Error != null)
  
              {
  
                  MessageBox.Show(e.Error.Message);
  
              }
  
              else if (e.Cancelled == true)
  
              {
  
                  MessageBox.Show("Download Aborted!\r\nYou will need to delete the .part file in the download folder.", "Abort");
  
              }
  
              else if (musicCheckBox.IsChecked == true)
  
              {
  
                  MessageBox.Show("Music Download finished.", "Successful");
  
              }
  
              else if (videoCheckBox.IsChecked == true)
  
              {
  
                  MessageBox.Show("Video Download finished.", "Successful");
  
              }
  
              // CMDoutputTextBox.Text = "";
  
              downloadBtn.Content = "Download!";
  
              downloadBtn.IsEnabled = true;
  
          }

  edit : The backgroundworker produces this output and calls RunWorkerFinished method. ffmpeg does nothing after the output.

  [ffmpeg] Converting video from mp4 to mkv, Destination: TAEYEON 태연_Why_Music Video-WkdtmT8A2iY.mkv

• Make syncronous ffmpeg calls from php

  3 février 2014, par Aditya Jhunjhunwala

  I have an application for creating webcam recordings, Once I record a video, I send a ajax call to a file, convert.php which has an ffmpeg call for converting the recordings, and once converted, the file is sent to S3.

  In one user session, 20-30 recordings get created, and the same number of calls to convert.php are sent as soon as the recording is stopped( As this was the desired flow, Can't alter it).

  Since, the recorded file sizes are different and their conversion takes different time, the file end up on S3 at different times(Which I guess is also because ffmpeg calls from different convert.php files run parallel, so a small file gets converted and transferred to S3 sooner than a large file).

  How can I make the server to wait for one ffmpeg call to complete, before initiating another, rather than parallel running of ffmpeg commands ??

  This is my convert.php

  <?php
  
      $filename = $_POST('filename');
  
      $input_filename = $filename.".flv";
  
      $output_filename = $filename.".mp4";
  
      $command = "ffmpeg -y -i ".$input_filename." -threads 16 -r 12 -crf 13 -qcomp 0.60 -vcodec libx264 ".$output_filename;
  
      exec($command);
  
      uploadtoS3();
  
  ?>

  Thanks in advance for the help....!!!!!