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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)

• avcodec/vvcdec : move frame tab memset from the main thread to worker threads

  28 juillet 2024, par Nuo Mi

  avcodec/vvcdec : move frame tab memset from the main thread to worker threads
  memset tables in the main thread can become a bottleneck for the decoder.
  
  For example, if it takes 1% of the processing time for one core, the maximum achievable FPS will be 100.
  
  Move the memeset to worker threads will fix the issue.
  

  • [DH] libavcodec/vvc/dec.c
  • [DH] libavcodec/vvc/thread.c
  • [DH] libavcodec/vvc/thread.h

• Rails MP4 playback working in Chrome but not Firefox

  9 février 2015, par Mark Boulder

  I got these MP4 video uploads via Paperclip that play just fine in Chrome but not in Firefox. Anybody know why that is ?

  http://runnable.com/VNkNeJ9wpNZJBEma/paperclip-mp4-problem

  Click Run and navigate to the last post to see the MP4. If you get a something bad happened from Runnable just try reloading the page.

  I tried adding Mime::Type.register "video/mp4", :mp4 to config/initializers/mime_types.rb but to no avail.

  • http://caniuse.com/#feat=video
  • Rails : MIME type issues with .m4v files
  • HTML5 video (mp4 and ogv) problems in Safari and Firefox - but Chrome is all good