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• Django send content-length to StreamingHttpResponse from a Popen process

  23 septembre 2015, par Carlos Rodriguez

  I need to serve ogg files created in realtime from big wav files.
  I can send the content but I dont have idea about why indicate the variable length of the data to StreamingHttpResponse.

  Here is my code :

  class OggAudioStreamer(object):
  
  
  
      def __init__(self, archivo):
  
          self.archivo = archivo
  
  
  
      def read(self, **kwargs):
  
          command = 'ffmpeg -i "{0}" -ac 1 -ar 22050 -acodec libvorbis -f ogg -'.format(self.archivo)
  
          args = split(command)
  
          response = Popen(args, stdout=PIPE, stderr=PIPE,
  
                           bufsize=8192, universal_newlines=False)
  
          response_iterator = iter(response.stdout.readline, b"")
  
  
  
          for resp in response_iterator:
  
              yield resp
  
  
  
  def ogg_stream_response(request):
  
      data = OggAudioStreamer('SOME WAV FILE')
  
      stream = StreamingHttpResponse(data.read(), content_type='audio/ogg')
  
      return stream

• How can I create a process that can be multiplied by a variable number ?

  18 octobre 2019, par Kaden

  A bit hard to explain this one, but I have an ingest of a variable amount of .mp4 files (sometimes it’s 30, other times it’s 10) and I need to have a subproccess.call('code', shell=True) for each of the .mp4 files that are being ingested into that folder. Each file has already been renamed in numeric order (1.mp4, 2.mp4, 3.mp4, etc...) and I can store the number of ingested files into a variable sumlines using the code
  with open(urls.txt", 'r') as file:     sumlines = sum(1 for _ in file)
  So my question is, is there a way I can use the variable sumlines to automatically subproccess call the exact number of files needed ?
  Find a screenshot here

• Can I use FFMPEG to replace $N number of frames while keeping the audio ?

  16 août 2020, par Ian Arman

  Is this possible with ffmpeg or am I required to use another program.

  


  I have a .mp4 file and I want to replace $n number of frames while keeping the audio.

  


  At this point I'm not concerned about transitions such as fading or anything - I'm only wondering if this is possible through the commands.

  


  Thus the output of the file would be {replaced frames - $N number}{remaining video - minus replaced frames}