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• How to merge flv files into one FLV video file using JavaScript ? [on hold]

  8 octobre 2018, par DingXuan

  I am developing an application (Chrome extension) to download videos from a specific website. The website split the FLV video file into multiple parts.
  Is it possible to merge/concat them into one FLV video file ? Or is there has any tools like FFMPEG for JavaScript ?

  (Not Node, I want to do it on client side.)

• Thread in Thread

  28 mai 2014, par user3679963

  My company is working for visual effects and we set up an internal shot playback via a browser for our clients. For that we need to upload the video file to a FTP server.

  I want to convert a image sequence to mp4 and upload this file directly after the rendering will finish.

  For that I use :

  • one command prompt to convert
  • one command prompt to get an `md5hash
  • one for uploading the file

  I already achieved that on my local computer, where I just chained os.system('command').

  After recognizing that the program freezes very long with longer image sequences I changed the script to spawn a thread using the os.system chain.
  But on the Render Farm Server this script does not actually work.

  The RenderFarm Server runs Python 2.5

  There are some code examples :

  class CopraUpload(threading.Thread):
  
  
  
      # initializing Thread
  
      # via super constructor
  
      def __init__(self):
  
          threading.Thread.__init__(self)
  
  
  
  
  
      # return the size of the
  
      # created mp4 file
  
      #
  
      # @return: the file size in byte
  
      def _getFileSize(self):
  
  
  
  
  
      # creates a random id for organising
  
      # the server upload used as flag
  
      #
  
      # @return: a hash
  
      def _getHash(self):
  
              self.fileLoc = str(self.outputfileName + '.mp4')
  
              self.fileLoc = os.path.normpath(self.fileLoc)
  
              return str(os.path.getsize(self.fileLoc))
  
  
  
      # integrates the "missing" data for the xml file
  
      # generated post render from the mp4 file
  
      def _setPreviewDataToXML(self):
  
          self.xmlFile = str(self.outputfileName + '_copraUpload.xml')
  
          self.xmlFile = os.path.normpath(self.xmlFile)
  
  
  
          ett = ET.parse(self.xmlFile)
  
          root = ett.getroot()
  
          for child in root.getiterator('preview_size'):
  
              child.text = self._getFileSize()
  
          for child in root.getiterator('preview_md5hash'):
  
              child.text = self._getHash()
  
          ett.write(self.xmlFile)
  
  
  
  
  
      # create a connection to a ftp server
  
      # and copies the mp4 file and the xml file
  
      # on the server
  
      def _uploadToCopra(self):
  
  
  
          os.system(self.uploadCommand)
  
          #process = Popen(self.uploadCommand)
  
  
  
  
  
      # the main function of the program
  
      # called via start from a Thread Object
  
      def run(self):
  
  
  
          # the command which will be send to the commando shell
  
          # for further adjustments see ffmpeg help with ffmpeg.exe -h
  
          FinalCommand = self.ffmpegLocation + " -r "+ self.framerate + " -i " + self.inputPath + " -an -strict experimental -s hd720 -vcodec libx264 -preset slow -profile:v baseline -level 31 -refs 1 -maxrate 6M -bufsize 10M -vb 6M -threads 0 -g 8 -r " + self.framerate + " " + self.outputfileName + ".mp4 -y"
  
          FinalCommandList = FinalCommand.split(" ")
  
  
  
  
  
          # calling the program
  
          print "Start ffmpeg convertion"
  
  
  
          outInfo = os.path.normpath("C:\\Users\\sarender\\Desktop\\stdoutFFMPEG.txt")
  
          outError = os.path.normpath("C:\\Users\\sarender\\Desktop\\stderrFFMPEG.txt")
  
          stdoutFile = open(outInfo,"w")
  
          stderrFile = open(outError,"w")
  
  
  
          handle = subp.check_all(FinalCommandList,stdout = stdoutFile,stderr = stderrFile)
  
          handle.communicate()
  
          stdoutFile.close()
  
          stderrFile.close()
  
          print "Convertion from ffmpeg done"
  
  
  
          # fill the xml file with the missing data
  
          # - preview file size
  
          # - preview md5hash
  
          self._setPreviewDataToXML()
  
          self._uploadToCopra()
  
          print "---------------------------------->FINISHED------------------------------------------------------>"
  
  
  
  
  
      # Creates a callable Thread for the Copra Upload.
  
      # start is calling the run method which will start the Uploading

  and the main start :

      if "$(RenderSet.writenode)" == "PREVIEW":
  
          print "---------------------------------->Initializing Script------------------------------------------------------>"
  
          process = CopraUpload()
  
          process.start()

  What happens :

  The script starts after the rendering and ffmpeg converts the image sequence and creates an mp4. But it stops after that. It does not print "Conversion from ffmpeg complet". Just stops the script.

  It actually should create the Thread converting with ffmpeg and wait until it finishes. After it should write some stuff in an xml file and upload both to the server.

  Do I miss something ? Is subprocess within a thread not the way to go ? But I need a Thread because I can not deadlock the render management server.

• VIVALDI FFMPEG H264 CODEC NVIDIA Mac OS X 10.12.5 ERROR HTML5 VIDEOS

  30 septembre 2018, par Arthur Melo

  I’ve been suffering with the vivaldi browser when trying to run some videos, I believe they use codecs that vivaldi can not run using the architecture of my video card, or something of the genre.
  The error does not manifest when using the Safari or Chrome or even Opera browsers.
  Attached is the error