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• How to return ffmepg processed output file and pass it to another function ? using python

  5 septembre 2018, par Ali Khan AK

  I want to convert video to audio using ffmpeg and I also want to return that audio file and pass it on to another function which generates text from that audio. But when I pass ’audio’ to function error shows file not found..

  def extract_audio(f):
  
  print("processing", f)
  
  inFile = f
  
  outFile = f[:-3] + "wav"
  
  cmd = "ffmpeg -i {} -vn  -ac 2 -ar 44100 -ab 320k -f wav {}".format(inFile, outFile)
  
  os.popen(cmd)
  
  print(outFile)
  
  print("Audio is ready to use..")
  
  return outFile
  
  
  
  def audio_to_text(audio):
  
  r = sr.Recognizer()
  
  r.energy_threshold = 4000
  
  with sr.WavFile(open(audio)) as source:  # use "test.wav" as the audio source
  
      audio_source = r.record(source)  # extract audio data from the file
  
      text = r.recognize_google(audio_source)
  
  try:
  
      print(text)  # recognize speech using Google Speech Recognition
  
  except LookupError:  # speech is unintelligible
  
      print("Could not understand audio")
  
  
  
  root = tk.Tk()
  
  root.withdraw()
  
  file_path = filedialog.askopenfilename()
  
  filename = os.path.basename(file_path)
  
  audio = extract_audio(filename)
  
  audio_to_text(audio)

• How to pass buffers as ffmpeg io in its commands

  3 septembre 2018, par Hossein Yazdanfar

  I’m using ffmpeg with its shared libraries(.so files) in my Android project (java language is using).
  (Actually using videokit library :videokit )

  I use ffmpeg commands to do things.
  For many reasons some times I need to use buffers as ffmpeg io.

  So how could I pass memory buffers as ffmpeg io ? (actually I mean using in its commands).
  I mean the io may not be files in storage and they may be something like byte[] or other memory buffer types...

  One simple use case :

  • Extracting a gif frames
  • Processing each frame by making Android Bitmap object of it and using Android sdk to edit them
  • Merging frames to make a gif of them
  • store output to byte [] so it can be used by third library like glide to show to user

  as it seems , because of performance it is not correct that input/output of each step be in stroage. And in my app the data(gif file here) maybe encrypted and should be decrypted. So i need some thing like buffers to pass to ffmpeg...

• Increase fps in record video ffmpeg

  16 juin 2017, par Badfishmaan

  I need to record 2 videos from 2 cameras in full hd 30 fps.
  I use ffmpeg and wrapper - Aforge for c#.

  init device :

          _videoCaptureDevice = new VideoCaptureDevice(deviceName);
  
          _videoCaptureDevice.VideoResolution = _videoCaptureDevice.VideoCapabilities[0];
  
          _videoCaptureDevice.DesiredFrameRate = _fps;
  
          _videoSourcePlayer.VideoSource = _videoCaptureDevice;
  
          _videoCaptureDevice.NewFrame += _videoCaptureDevice_NewFrame;
  
          _videoSourcePlayer.Start();

  saving frames

          if (_videoRecordStatus == VideoRecordStatus.Recording)
  
          {
  
              _videoFileWriter.WriteVideoFrame(eventArgs.Frame);
  
          }

  and init file writer

              _videoFileWriter = new VideoFileWriter();
  
              _videoFileWriter.Open(_fileName, _videoCaptureDevice.VideoResolution.FrameSize.Width,
  
                  _videoCaptureDevice.VideoResolution.FrameSize.Height, 30, VideoCodec.MPEG4, 10 * 1000 * 1000);

  now _videoCaptureDevice.VideoResolution.FrameSize equals 1280x720 and 640x480 (for second device). But I already have problems with recording. Maximum fps is 24 for 480p and 13-14 for 720p (when I try to record videos from 2 cameras in the same time)

  How to increase it ?
  Or it isn’t possible ? Maybe more powerfull computer will solve this problem (I have Pentium(R) Dual-Core CPU 2.50Ghz and usual videocart (Geforse 8500 GT) for working with two displays, usual hdd, usb 2.0) ?

  I will glad any help (maybe another library, but not language (c#))

  PS
  I already used Emgu.CV and faced with simular problems..