Recherche avancée

Sur d’autres sites (10999)

• wMy media converter app crashes when handling file names with spaces

  8 janvier 2013, par suffa

  I wrote an app that uses ffmpeg to convert media files (.wav, .avi, .mp3, ... etc.). It works only with file names that have no spaces. When a file name with spaces is encountered, the app immediately closes. Can someone tell me if the string I'm using to call ffmpeg is correct, or need some characters escaped ? Below is a fragment of the code :

  ...
  
  ...
  
  ...
  
  
  
  #Select Media
  
  os.chdir("c:\\d-Converter\\ffmpeg\\bin")
  
  wrkdir = os.getcwd()
  
  filelist = os.listdir(wrkdir)
  
  self.formats1 = []
  
  
  
  for filename in filelist:
  
      (head, filename) = os.path.split(filename)
  
      if filename.endswith(".avi") or filename.endswith(".mp4") or filename.endswith(".flv") or filename.endswith(".mov") or filename.endswith(".mpeg4") or filename.endswith(".mpeg") or filename.endswith(".mpg2") or filename.endswith(".wav") or filename.endswith(".mp3"):
  
              self.formats1.append(filename)
  
      self.format_combo1=wx.ComboBox(panel, size=(140, -1),value='Select Media', choices=self.formats1, style=wx.CB_DROPDOWN, pos=(300,50))
  
  
  
      self.Bind(wx.EVT_COMBOBOX, self.fileFormats, self.format_combo1)
  
  
  
  
  
  ...
  
  ...
  
  ...
  
  
  
  
  
  def fileFormats(self, e):
  
      myFormats = {'audio': ('Select Format','.mp3', '.ogg', '.wav', '.wma'), 'video': ('Select Format','.flv','.mpg', '.mp4', '.mpeg')}
  
      bad_file = ['Media not supported']
  
      myFile = self.format_combo1.GetValue()
  
      f_exten = (x for x in myFormats['audio'] + myFormats['video'] if myFile.endswith(x))
  
      extension = f_exten.next()
  
  
  
      if extension in myFormats['audio']:
  
          self.format_combo2.SetItems(myFormats['audio'])
  
  
  
      elif extension in myFormats['video']:
  
          self.format_combo2.SetItems(myFormats['video'])
  
      else:
  
          self.format_combo2.SetItems(bad_file)
  
  ...
  
  ...
  
  ...
  
  
  
  
  
  def convertButton(self, e):
  
  
  
      unit1 = self.format_combo1.GetValue()
  
      if unit1:
  
          unit1 = self.repl_Wspace(unit1)
  
  
  
      #Media Formats
  
      unit2 = self.format_combo2.GetValue()
  
      unit3 = self.format_combo3.GetValue()
  
      unit4 = None
  
      unit5 = self.format_combo5.GetValue()
  
      bitRate = self.format_combo6.GetValue()
  
      unit6 = bitRate
  
      if unit3 == '-qmax':
  
          unit4 = self.format_combo4.GetValue()
  
      else:
  
          pass
  
  
  
      os.chdir("c:\\d-Converter\\ffmpeg\\bin")
  
      wrkdir = os.getcwd()
  
  
  
      newfile = unit1
  
      stripped = newfile.strip('mpeg3aviovfl4w2c.') #Strips the extension from the original file name
  
  
  
  
  
      progname='c:\\d-Converter\\ffmpeg\\bin\\ffmpeg.exe' + ' -i '
  
  
  
      preset1_a='-vn -ar 44100 -ac 2 -ab'
  
      preset1_b='-f mp3 '
  
      preset_mp3='.mp3'
  
  
  
      chck_unit1 = self.my_endswith(unit1)
  
  
  
  
  
  
  
      while True:    
  
          if unit5 == 'video to mp3':
  
  
  
              if unit6 == 'k/bs' or unit6 == '':
  
                  amsg = wx.MessageDialog(None, 'You must select a bit rate.', 'Media Converter', wx.ICON_INFORMATION)
  
                  amsg.ShowModal()
  
                  amsg.Destroy()
  
                  break
  
  
  
              elif unit5 == 'video to mp3' and unit6 != 'k/bs' or unit6 != '':
  
                  self.button.Disable()
  
                  self.button2.Enable()
  
                  self.format_combo1.Disable()
  
                  self.format_combo2.Disable()
  
                  self.format_combo3.Disable()
  
                  self.format_combo4.Disable()
  
                  self.format_combo5.Disable()
  
                  self.format_combo6.Disable()
  
                  startWorker(self.LongTaskDone, self.LongTask3, wargs=(progname, wrkdir, unit1, preset1_a, unit6, preset1_b, stripped, preset_mp3))
  
                  break
  
              elif unit1 != unit1.endswith(".mpg") or unit1.endswith(".mpeg") or unit1.endswith(".avi") or unit1.endswith(".mp4") or unit1.endswith(".flv"):
  
                  bmsg = wx.MessageDialog(None, 'You must select a valid format to convert to .mp3.', 'Media Converter', wx.ICON_INFORMATION)
  
                  bmsg.ShowModal()
  
                  bmsg.Destroy()
  
                  break
  
  
  
          else:
  
              pass
  
  
  
  
  
  
  
          if unit1 == 'Select Media' or unit1 == '':
  
              amsg = wx.MessageDialog(None, 'You must select a media file!', 'Media Converter', wx.ICON_INFORMATION)
  
              amsg.ShowModal()
  
              amsg.Destroy()
  
              break
  
  
  
  
  
          elif unit2 == 'Select Format' or unit2 == '' or unit2 == chck_unit1:
  
              amsg = wx.MessageDialog(None, 'You must select a valid format', 'Media Converter', wx.ICON_INFORMATION)
  
              amsg.ShowModal()
  
              amsg.Destroy()
  
              break
  
  
  
  
  
          elif unit3 == 'Select Quality' or unit3 == '':
  
              amsg = wx.MessageDialog(None, 'You must select quality', 'Media Converter', wx.ICON_INFORMATION)
  
              amsg.ShowModal()
  
              amsg.Destroy()
  
              break
  
  
  
          elif unit3 != 'Select Quality' or unit3 != '':
  
              self.format_combo5.Disable()
  
  
  
              if unit3 == '-qmax':
  
                  if unit4 == '0' or unit4 == '':
  
                      amsg = wx.MessageDialog(None, 'You must select number between 1-8.', 'Media Converter', wx.ICON_INFORMATION)
  
                      amsg.ShowModal()
  
                      amsg.Destroy()
  
                      break
  
                  else:
  
                      self.button.Disable()
  
                      self.button2.Enable()
  
                      self.format_combo1.Disable()
  
                      self.format_combo2.Disable()
  
                      self.format_combo3.Disable()
  
                      self.format_combo4.Disable()
  
                      self.format_combo5.Disable()
  
                      startWorker(self.LongTaskDone, self.LongTask2, wargs=(progname,wrkdir,unit1,unit3,unit4,stripped,unit2))
  
                      break
  
              elif unit3 == '-sameq':
  
                  self.button.Disable()
  
                  self.button2.Enable()
  
                  self.format_combo1.Disable()
  
                  self.format_combo2.Disable()
  
                  self.format_combo3.Disable()
  
                  self.format_combo4.Disable()
  
                  self.format_combo5.Disable()
  
                  startWorker(self.LongTaskDone, self.LongTask, wargs=(progname,wrkdir,unit1,unit3,stripped,unit2))
  
                  break   
  
  
  
  
  
  
  
  
  
  def LongTask(self, progname, wrkdir, unit1, unit3, stripped, unit2):
  
      convert_file1 = progname + wrkdir + '\\' + unit1 + ' ' + unit3 + ' ' + stripped + unit2
  
      self.statusbar.SetStatusText("Converting: " + unit1 + "...")
  
      os.system(convert_file1)
  
      print convert_file1
  
  
  
  
  
  def LongTask2(self, progname, wrkdir, unit1, unit3, unit4, stripped, unit2):
  
      convert_file2 = progname + wrkdir + '\\' + unit1 + ' ' + unit3 + ' ' + unit4 + ' ' + stripped + unit2
  
      self.statusbar.SetStatusText("Converting: " + unit1 + "...")
  
      os.system(convert_file2)
  
  
  
  ...
  
  ...
  
  ...

• Why the source order matters on working with multiple media sources in a single AVFormatContext ?

  24 avril 2024, par Mehmet YILMAZ

  avformat_open_input() deletes the AVFormatContext* and returns -6 when the source order changes.

  


  I am trying to open multiple media sources dynamically with different(mixed) formats and codecs in a single context (AVFormatContext).

  


  My media sources are a BlackMagic DeckLink Duo SDI input as first source and an mp4 file or rtsp stream as second.

  


  When I order to open (avformat_open_input()) the source 2 (RTSP or MP4 file) at first and then open the BlackMagic DeckLink Duo, proceed as expected.

  


  But when I change the order, and first open the DeckLink and then try to open RTSP stream or MP4 file, as I inspected in the step debugger ; AVFormatContext* deleting in the av_open_input() function and it returns -6 as result.

  


  Please find the simple error reproduction code snappet below ;

  


  AVFormatContext* context{avformat_alloc_context()};
const char* url_source1{"DeckLink Duo (1)"};
const AVInputFormat* format_source1{av_find_input_format("decklink")};

const char* url_source2{"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"};

// Open the first media input
int result = avformat_open_input(&context, url_source1, format_source1, NULL);

if(result < 0) {
  exit(1);
}

// Open the second media input
// This function in current order deletes the context and returns -6
result = avformat_open_input(&context, url_source2, NULL, NULL);
if(result < 0) {
  exit(1);
}

// Since the context has been deleted in previous step, segmentation fault accours here!
result = avformat_find_stream_info(context, NULL);
if(result < 0) {
  exit(1);
}

std::cout << "Total number of streams: " << context->nb_streams << std::endl;



  


  But When I change the order and call the avformat_open_input() first for the mp4 file and then the DeckLink device as following it proceed as expected, no error.

  


  AVFormatContext* context{avformat_alloc_context()};
const char* url_source1{"DeckLink Duo (1)"};
const AVInputFormat* format_source1{av_find_input_format("decklink")};

const char* url_source2{"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"};


// Open the second media input
int result = avformat_open_input(&context, url_source2, NULL, NULL);
if(result < 0) {
  exit(1);
}


// Open the first media input
result = avformat_open_input(&context, url_source1, format_source1, NULL);

if(result < 0) {
  exit(1);
}


result = avformat_find_stream_info(context, NULL);
if(result < 0) {
  exit(1);
}

std::cout << "Total number of streams: " << context->nb_streams << std::endl;



  


• Anomalie #2069 (Fermé) : media changer un fichier

  5 juillet 2011, par cedric -

  Corrigé par http://zone.spip.org/trac/spip-zone/changeset/49369