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• Trying to convert an mp3 file to a Numpy Array, and ffmpeg just hangs

  5 juillet 2016, par Rich

  I’m working on a music classification methodology with Scikit-learn, and the first step in that process is converting a music file to a numpy array.

  After unsuccessfully trying to call ffmpeg from a python script, I decided to simply pipe the file in directly :

  FFMPEG_BIN = "ffmpeg"
  
  cwd = (os.getcwd())
  
  dcwd = (cwd + "/temp")
  
  if not os.path.exists(dcwd): os.makedirs(dcwd)
  
  
  
  folder_path = sys.argv[1]
  
  f = open("test.txt","a")
  
  
  
  for f in glob.glob(os.path.join(folder_path, "*.mp3")):
  
      ff = f.replace("./", "/")
  
      print("Name: " + ff)
  
      aa = (cwd + ff)
  
  
  
      command = [ FFMPEG_BIN,
  
          '-i',  aa,
  
          '-f', 's16le',
  
          '-acodec', 'pcm_s16le',
  
          '-ar', '22000', # ouput will have 44100 Hz
  
          '-ac', '1', # stereo (set to '1' for mono)
  
          '-']
  
  
  
      pipe = sp.Popen(command, stdout=sp.PIPE, bufsize=10**8)
  
      raw_audio = pipe.proc.stdout.read(88200*4)
  
      audio_array = numpy.fromstring(raw_audio, dtype="int16")
  
      print (str(audio_array))
  
      f.write(audio_array + "\n")

  The problem is, when I run the file, it starts ffmpeg and then does nothing :

  [mp3 @ 0x1446540] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from '/home/don/Code/Projects/MC/Music/Spaz.mp3':
  
    Metadata:
  
      title           : Spaz
  
      album           : Seeing souns
  
      artist          : N*E*R*D
  
      genre           : Hip-Hop
  
      encoder         : Audiograbber 1.83.01, LAME dll 3.96, 320 Kbit/s, Joint Stereo, Normal quality
  
      track           : 5/12
  
      date            : 2008
  
    Duration: 00:03:50.58, start: 0.000000, bitrate: 320 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
  Output #0, s16le, to 'pipe:':
  
    Metadata:
  
      title           : Spaz
  
      album           : Seeing souns
  
      artist          : N*E*R*D
  
      genre           : Hip-Hop
  
      date            : 2008
  
      track           : 5/12
  
      encoder         : Lavf56.4.101
  
      Stream #0:0: Audio: pcm_s16le, 22000 Hz, mono, s16, 352 kb/s
  
      Metadata:
  
        encoder         : Lavc56.1.100 pcm_s16le
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mp3 (native) -> pcm_s16le (native))
  
  Press [q] to stop, [?] for help

  It just sits there, hanging, for far longer than the song is. What am I doing wrong here ?,

• Path to publish FFMPEG video files to Azure Blob Storage ?

  25 janvier 2016, par CG-Guy

  Please kindly help me get out of a bad situation with a very very unhappy client. I am using FFMPEG based app to publish video files to Azure Blob storage, but the files are not going through the network. FFMPEG app has full access to firewall ports. FFMPEG communication shell show files are published without errors. A look at TCP connections shows the app is making connection with Azure account remote address 104.208.XXX.XX and remote port 443. However, it drops the connection and starts repeating attempts over and over. It will then time out after countless attempts and crash the app. Here is my publish point. Is this the correct publish point for this kind of connection ? What is the proper connection string ? :

  https://account-name.blob.core.windows.net/video/video.flv /DestKey :account-storage-key

  I have also tried http:// without success. Same thing happens. It attempts connecting to remote address and port 80. Again, after several attempts it will timeout and crash. System is a Server 2008 R2 unit on-site, not VM. Your help is much appreciated. Thanks a lot !

• How to upload files to Azure Blob Stotage like FTP ?

  25 janvier 2016, par CG-Guy

  I am able to upload files from my ffmpeg app to an FTP using this path :

  ftp://[user:password]@server[:port]/MyFolder/video/video.flv

  How do I achieve the same thing in Azure Blob ? I have tried this path :

  https://[account-name].blob.core.windows.net/video/video.flv /DestKey:[account-storage-key]

  But that doesn’t seem to work. TCP connection shows the app is making a connection with the Azure account to the remote address 104.208.XXX.XX and remote port 443. However, it drops the connection and starts attempts to reconnect repeatedly. It will then time out after countless attempts and crash the app. I have also tried /> without success. The same thing happens. It attempts connecting to the remote address and port 80.

  The FFMPEG app has full access to firewall ports and the app communication shell show files are published without errors. System is a Server 2008 R2 unit on-site, not VM.