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

  29 mai 2021, 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 ?,

  


• Want to send a video from desktop to Wowza using ffmpeg

  3 mars 2018, par ST94

  I am trying to stream a local .mp4 video file from my laptop to Wowza Streaming Engine using ffmpeg. Both systems are able to ping each other. I give the following command on my laptop

  ffmpeg -re -i bunny_1080p_60fps_normal.mp4 -vcodec libx264 -acodec aac -ar 48000 -strict experimental -f flv "rtmp://192.168.1.22:1935/live/myStream"

  192.168.1.22 is the IP address of Wowza server residing on another system running Ubuntu 17.04.

  I see the following on the command prompt of my laptop when I give the above command,

  ffmpeg version N-89894-g18e2ac032e Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
  
    libavutil      56.  7.100 / 56.  7.100
  
    libavcodec     58.  9.100 / 58.  9.100
  
    libavformat    58.  5.101 / 58.  5.101
  
    libavdevice    58.  0.101 / 58.  0.101
  
    libavfilter     7. 11.101 /  7. 11.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bunny_1080p_60fps_normal.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      creation_time   : 2013-12-16T17:59:32.000000Z
  
      title           : Big Buck Bunny, Sunflower version
  
      artist          : Blender Foundation 2008, Janus Bager Kristensen 2013
  
      comment         : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
  
      genre           : Animation
  
      composer        : Sacha Goedegebure
  
    Duration: 00:10:34.53, start: 0.000000, bitrate: 4486 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4001 kb/s, 60 fps, 60 tbr, 60k tbn, 120 tbc (default)
  
      Metadata:
  
        creation_time   : 2013-12-16T17:59:32.000000Z
  
        handler_name    : GPAC ISO Video Handler
  
      Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 160 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-12-16T17:59:37.000000Z
  
        handler_name    : GPAC ISO Audio Handler
  
      Stream #0:2(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 320 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-12-16T17:59:37.000000Z
  
        handler_name    : GPAC ISO Audio Handler
  
      Side data:
  
        audio service type: main
  
  [rtmp @ 000001ed7c4108c0] No credentials set
  
  [rtmp @ 000001ed7c4108c0] Server error: [ AccessManager.Reject ] : [ code=403 need auth; authmod=adobe ] :
  
  rtmp://192.168.1.22:1935/live/myStream: Unknown error occurred

  Can anyone please tell me what the exact procedure is to stream a video file to Wowza .

  How will I be able to view the stream at Wowza ?

• Why does FFMPEG report the wrong duration ?

  7 janvier 2020, par Adrian Lynch

  I have an oldish build of FFmpeg that I can’t easily change.

  We use FFmpeg to find the duration of video and sound files. So far it has been working wonderfully.

  Recently on an uploaded file, FFmpeg has reported a 30 second file as being 5 minutes 30 seconds in length.

  Could it be something wrong with the file rather than FFmpeg ?

  If I use FFmpeg to convert to another file, the duration is restored.

  In case it matters, ffmpeg -i ’path to the file’ produces :

  FFmpeg version Sherpya-r15618, Copyright (c) 2000-2008 Fabrice Bellard, et al.
    libavutil     49.11. 0 / 49.11. 0
    libavcodec    52. 0. 0 / 52. 0. 0
    libavformat   52.22. 1 / 52.22. 1
    libavdevice   52. 1. 0 / 52. 1. 0
    libswscale     0. 6. 1 /  0. 6. 1
    libpostproc   51. 2. 0 / 51. 2. 0
    built on Oct 14 2008 23:43:47, gcc : 4.2.5 20080919 (prerelease) [Sherpya]
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’H :\path\to\file.mov’ :
    Duration : 00:05:35.00, start : 0.000000, bitrate : 1223 kb/s
      Stream #0.0(eng) : Audio : aac, 44100 Hz, stereo, s16
      Stream #0.1(eng) : Video : h264, yuv420p, 720x576, 25.00 tb(r)
  Must supply at least one output file
  

  It’s that very command I use to then extract the duration with RegEx.

  Does anyone have a nice application that can do what I’m trying above but get it right 100% of the time ?