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• Python PyQT : How to call a GUI function from a worker thread ?

  18 juillet 2014, par rainer

  I have a pyqt gui and calling a long process (ffmpeg) which I put on a separate thread to not block the gui. I then want to update a progress bar when one command of a longer list of commands finishes. The problem is, that I can’t call a function in the gui thread out of the worker thread. So I let run a ticker in the worker thread, but when I update the progress bar with a while loop and reading the ticker value, the gui gets blocked again. How can I solve this. I used currently python threading and not Qthread.
  Thx for any help !

  import threading, pexpect
  
  
  
  self.cmd_list = ['ffmpeg -i file outfile','and so on']
  
  
  
  self.stop_proc = False
  
  self.executeCMD()
  
  
  
  def spawn_ffmpeg_cmd(self):
  
      for cmd in self.cmd_list:
  
          if self.stop_proc == False:
  
              thread = pexpect.spawn(cmd)
  
              print "\nstarted: %s" % cmd
  
              cpl = thread.compile_pattern_list([pexpect.EOF,"frame= *\d+ fps=*\d+",'(.+)'])
  
  
  
              while True:
  
                  i = thread.expect_list(cpl, timeout=None)
  
                  if i == 0: # EOF
  
                      print "the sub process exited"
  
                      self.pgticker += 1
  
                      break
  
                  elif i == 1:
  
                      frame_number_fps = thread.match.group(0)
  
                      print frame_number_fps
  
                      thread.close
  
                  elif i == 2:
  
                      pass
  
      self.startButton.setEnabled(True)
  
  
  
  
  
  def executeCMD(self):
  
      self.startButton.setEnabled(False)
  
      self.pgticker = 0
  
      threading.Thread(target=self.spawn_ffmpeg_cmd, name="_proc").start()
  
  
  
  
  
  def stopprocess(self):
  
      self.stop_proc = True
  
      self.cmd_list = []
  
      os.system('pkill ffmpeg') 
  
      self.pgticker = len(self.cmd_list)
  
      self.startButton.setEnabled(True)
  
  
  
  
  
  def updateProgress(self):  
  
      pgfactor = 100 / len(self.cmd_list)
  
      progress = 0.0
  
      progress = pgfactor*int(self.pgticker)
  
      self.progressBar.setProperty("value", progress)

• error converting .caf to .mp3 in mvc 4

  17 avril 2014, par Jennifer

  I used to convert caf to mp3 using Wscript.shell and ffmpeg.exe when i was using asp.net
  but now i'm using a web api restful method in mvc 4, so i don't have a .aspx page
  i'm getting the following error :

     Description:System.Web.HttpException (0x80004005): The component 'Wscript.Shell' cannot be created.  Apartment threaded components can only be created on pages with an <%@ Page aspcompat=true %> page directive.

  but i don't have an aspx page to add this tag...

  the code i was using in aspx is :

     Dim wshShell As Object
  
     wshShell = Server.CreateObject("Wscript.Shell")
  
     cmd = "cmd.exe /k """"" & szCAF_PATH & """ -i """ & szPhysicalPath & """ " & Arguments & " """ & szEncodedPath & """"""
  
     wshShell.Run(cmd)
  
     Dim strCommand As String = "taskkill /F /IM cmd.exe"
  
     wshShell.Run(strCommand, 0, True)
  
     szDownloadLink = szDownloadLink.Replace(".caf", ".mp3")

  and the code in mvc4 is :

     wshShell = HttpContext.Current.Server.CreateObject("Wscript.Shell")
  
     cmd = "cmd.exe /k """"" & File.CAF_PATH & """ -i """ & File.PhysicalPath & """ " & File.Arguments & " """ & File.EncodedPath & """"""
  
     wshShell.Run(File.cmd)
  
     strCommand = "taskkill /F /IM cmd.exe"
  
     wshShell.Run(strCommand, 0, True)
  
     File.DownloadLink = File.DownloadLink.Replace(".caf", ".mp3")

  does anyone know how can i fix this ?

• Is it possible to use MediaTransportControls with FFmpegInterop in UWP ?

  1er janvier 2020, par Agredo

  Is it possible to use the MediaTransportControls ? Currently getting the error "Could not decode video" using any MediaTransportControl.

  XAML

  <mediaplayerelement source="{Binding VideoSource}" autoplay="True" aretransportcontrolsenabled="True"></mediaplayerelement>

  ViewModel

          FileOpenPicker picker = new FileOpenPicker();
  
          picker.FileTypeFilter.Add("*");
  
  
  
          var file = await picker.PickSingleFileAsync();
  
  
  
          var stream = await file.OpenReadAsync();
  
  
  
          var mediaStreamsource = FFmpegInteropMSS.CreateFFmpegInteropMSSFromStream(stream, false, false).GetMediaStreamSource();
  
  
  
          VideoSource = MediaSource.CreateFromMediaStreamSource(mediaStreamsource);

  Thanks
  Agredo