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• Can speex be packed into mpegts stream ?

  24 juillet 2013, par user2384001

  I want to use speex in a real-time application. I want to playback this mpegts stream by ffmpeg. Are there any means to pack speex into mpegts stream ?

• How to read realtime microphone audio volume in python and ffmpeg or similar

  1er septembre 2023, par Ryan Martin

  I'm trying to read, in near-realtime, the volume coming from the audio of a USB microphone in Python.

  


  I have the pieces, but can't figure out how to put it together.

  


  If I already have a .wav file, I can pretty simply read it using wavefile :

  


  from wavefile import WaveReader

with WaveReader("/Users/rmartin/audio.wav") as r:
    for data in r.read_iter(size=512):
        left_channel = data[0]
        volume = np.linalg.norm(left_channel)
        print(volume)


  


  This works great, but I want to process the audio from the microphone in real-time, not from a file.

  


  So my thought was to use something like ffmpeg to PIPE the real-time output into WaveReader, but my Byte knowledge is somewhat lacking.

  


  import subprocess
import numpy as np

command = ["/usr/local/bin/ffmpeg",
            '-f', 'avfoundation',
            '-i', ':2',
            '-t', '5',
            '-ar', '11025',
            '-ac', '1',
            '-acodec','aac', '-']

pipe = subprocess.Popen(command, stdout=subprocess.PIPE, bufsize=10**8)
stdout_data = pipe.stdout.read()
audio_array = np.fromstring(stdout_data, dtype="int16")

print audio_array


  


  That looks pretty, but it doesn't do much. It fails with a [NULL @ 0x7ff640016600] Unable to find a suitable output format for 'pipe:' error.

  


  I assume this is a fairly simple thing to do given that I only need to check the audio for volume levels.

  


  Anyone know how to accomplish this simply ? FFMPEG isn't a requirement, but it does need to work on OSX & Linux.

  


• cosmetics : group remaining .name and .long_name.

  4 octobre 2013, par Clément Bœsch

  cosmetics : group remaining .name and .long_name.
  See b2bed9325.
  

  • [DH] libavcodec/012v.c
  • [DH] libavcodec/avrndec.c
  • [DH] libavcodec/avuidec.c
  • [DH] libavcodec/avuienc.c
  • [DH] libavcodec/bintext.c
  • [DH] libavcodec/brender_pix.c
  • [DH] libavcodec/cpia.c
  • [DH] libavcodec/crystalhd.c
  • [DH] libavcodec/dcaenc.c
  • [DH] libavcodec/diracdec.c
  • [DH] libavcodec/evrcdec.c
  • [DH] libavcodec/exr.c
  • [DH] libavcodec/ffwavesynth.c
  • [DH] libavcodec/flashsv2enc.c
  • [DH] libavcodec/g723_1.c
  • [DH] libavcodec/g729dec.c
  • [DH] libavcodec/h264.c
  • [DH] libavcodec/j2kenc.c
  • [DH] libavcodec/libaacplus.c
  • [DH] libavcodec/libcelt_dec.c
  • [DH] libavcodec/libshine.c
  • [DH] libavcodec/libtwolame.c
  • [DH] libavcodec/libvorbisdec.c
  • [DH] libavcodec/libx264.c
  • [DH] libavcodec/libzvbi-teletextdec.c
  • [DH] libavcodec/mjpegenc.c
  • [DH] libavcodec/mpeg12dec.c
  • [DH] libavcodec/mpeg4videodec.c
  • [DH] libavcodec/msvideo1enc.c
  • [DH] libavcodec/mvcdec.c
  • [DH] libavcodec/paf.c
  • [DH] libavcodec/proresdec2.c
  • [DH] libavcodec/proresenc_anatoliy.c
  • [DH] libavcodec/r210dec.c
  • [DH] libavcodec/r210enc.c
  • [DH] libavcodec/s302menc.c
  • [DH] libavcodec/sanm.c
  • [DH] libavcodec/sgirledec.c
  • [DH] libavcodec/smvjpegdec.c
  • [DH] libavcodec/snowdec.c
  • [DH] libavcodec/snowenc.c
  • [DH] libavcodec/sonic.c
  • [DH] libavcodec/targa_y216dec.c
  • [DH] libavcodec/textdec.c
  • [DH] libavcodec/ttaenc.c
  • [DH] libavcodec/v308dec.c
  • [DH] libavcodec/v308enc.c
  • [DH] libavcodec/v408dec.c
  • [DH] libavcodec/v408enc.c
  • [DH] libavcodec/vc1dec.c
  • [DH] libavcodec/vima.c
  • [DH] libavcodec/vp8.c
  • [DH] libavcodec/vp9.c
  • [DH] libavcodec/xbmdec.c
  • [DH] libavcodec/xfacedec.c
  • [DH] libavcodec/xfaceenc.c
  • [DH] libavcodec/y41pdec.c
  • [DH] libavcodec/y41penc.c
  • [DH] libavcodec/yuv4dec.c
  • [DH] libavcodec/yuv4enc.c