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• Python : How to convert a mp3 chunk from webstream to .wav samples ?

  13 novembre 2019, par Bendzko

  I’m trying to catch chunks of an mp3 webstream and coverting them into wav samples for signal processing. I tried to catch the audio via requests and io.BytesIO to save the data as .wav file.
  But I think, that I have to convert the mp3 data to wav data, but I don’t know how. (My goal is not to record a .wav file, i am just doing this to test the algorithm.)

  I found the pymedia lib, but it is very old (last commit in 2006), using python 2.7 and for me not installable.

  Maybe it is possible with ffmpeg-python, but I have just seen examples using files as input and output.

  Here’s my code :

  import requests
  
  import io
  
  import soundfile as sf
  
  import struct
  
  import wave
  
  import numpy as np
  
  
  
  
  
  def main():
  
      stream_url = r'http://dg-wdr-http-dus-dtag-cdn.cast.addradio.de/wdr/1live/diggi/mp3/128/stream.mp3'
  
      r = requests.get(stream_url, stream=True)
  
      sample_array = []
  
      try:
  
          for block in r.iter_content(1024):
  
              data, samplerate = sf.read(io.BytesIO(block), format="RAW", channels=2, samplerate=44100, subtype='FLOAT',
  
                                         dtype='float32')
  
              sample_array = np.append(sample_array, data)
  
  
  
      except KeyboardInterrupt:
  
          print("...saving")
  
          obj = wave.open('sounds/stream1.wav', 'w')
  
          obj.setnchannels(1)  # mono
  
          obj.setsampwidth(2)  # bytes
  
          obj.setframerate(44100)
  
  
  
          data_max = np.nanmax(abs(sample_array))
  
  
  
          # fill WAV with samples from sample_array
  
          for sample in sample_array:
  
              if (np.isnan(sample) or np.isnan(32760 * sample / data_max)) is True:
  
                  continue
  
              try:
  
                  value = int(32760 * sample / data_max)  # normalization INT16
  
              except ValueError:
  
                  value = 1
  
              finally:
  
                  data = struct.pack('code>

  Do you have an idea how to handle this problem ?

• compiling ffmpeg libs with libvpx enabled on windows

  12 juin 2021, par Satishsuman

  Need some regarding compiling ffmpeg with libvpx enabled on windows. Here is the steps i followed and error i got

  



  

  1. installed msys2 on windows and installed required packages(git,pkg-config,gcc compiler etc)

  


  2. cloned libvpx from "https://github.com/webmproject/libvpx.git" and created a vs15 solution(command : ./configure —disable-vp8 —disable-vp9-encoder —target=x86_64-win64-vs15)

  


  3. open vpx.sln and compiled vpxmd.lib sucessfully(created a vpx.pc file and kept include and libs at proper place)

  


  4. cloned ffmpeg from https://github.com/FFmpeg/FFmpeg.git and from msys2 i tried building it(command : ./configure —enable-asm —enable-yasm —arch=x86_64 —target-os=win64 —disable-encoders —disable-muxers —enable-libvpx —disable-doc —disable-ffplay —disable-ffprobe —disable-ffmpeg —enable-shared —disable-static —disable-bzlib —disable-libopenjpeg —disable-iconv —disable-zlib —prefix=/d/Stadia/FFmpeg —toolchain=msvc —disable-debug)

  


  



  ffmpeg libs a building fine but it doesn't include libvpx.
config.log is below :

  



  


  ./ffconf.NEscC1Fm/test.c(4) : warning C4311 : 'type cast' : pointer
 truncation from 'vpx_codec_iface_t *(__cdecl *)(void)' to 'long'

  
 


  ./compat/windows/mslink /usr/local/lib -nologo -I/usr/local/include
 -libpath :/usr/local/lib -out :./ffconf.NEscC1Fm/test.exe ./ffconf.NEscC1Fm/test.o vpx.lib

  
 


  LINK : warning LNK4044 : unrecognized option
 '/IC :/msys64/usr/local/include' ; ignored lib.obj(vp8_vp8_dx_iface.obj)
 : MSIL .netmodule or module compiled with /GL found ; restarting link
 with /LTCG ; add /LTCG to the link command line to improve linker
 performance

  
 


  LINK : warning LNK4044 : unrecognized option
 '/IC :/msys64/usr/local/include' ; ignored

  
 


  LINK : warning LNK4098 : defaultlib 'MSVCRT' conflicts with use of
 other libs ; use /NODEFAULTLIB:library lib.obj(vpx_mem_vpx_mem.obj) : 
 error LNK2001 : unresolved external symbol __imp_malloc
 lib.obj(vp8_decoder_threading.obj) : error LNK2001 : unresolved
 external symbol __imp__beginthreadex
 lib.obj(vp8_decoder_decodeframe.obj) : error LNK2001 : unresolved
 external symbol __imp_fopen ./ffconf.NEscC1Fm/test.exe : fatal error
 LNK1120 : 3 unresolved externals

  
 


  my msys2 is installed at C :/msys2/ and /home/ correspond to
 C/msys2/home if i use —extra-ldflags="-L/home/usr/local/lib" , linker
 treates it as /LC :/msys2/usr/local/lib and hence fails.

  


  



  A step by step guide would be very much appreciated here

  


• php ffmpeg exec & shell_exec process stops after few seconds

  6 octobre 2019, par Salem

  I’m using PHP script file with simple html interface to control FFMPEG process start and stop from the browser , the script goal is start live streaming on my server that usually runs for hours without stop (using ffmpeg and nginx-rtmp )
  my script were working perfectly until I notice recently This is strange behaviors
  here is my php script variables

  $cast =" /usr/sbin/ffmpeg -loglevel 0 -thread_queue_size 32768 -re -i '".$src."' -i /var/www/example/logo.png -r 23.976 -strict -2 480x360 -aspect 16:9 -filter_complex 'overlay=x=(main_w-overlay_w)/2:y=(main_h-overlay_h)-23' -vcodec libx264 -x264opts colormatrix=bt709 -profile:v high444 4 -b:v 290k -maxrate 290k -bufsize 250k  -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0" -acodec libfdk_aac -profile:a aac_he_v2 -b:a 16k -map_metadata -1 -f flv  rtmp://localhost/hls/live 2>/dev/null >/dev/null  & " ; 
  
  $output =  shell_exec( $cast   )    ;

  It’s like FFMPEG process continue until original php process ( that call it ) die , at first I thought this issue with the sorce or ffmpeg command but I test the same command on the sell and it works perfectly .
  My suspicion are with on STDIO etc were not redirected right . even when I excute the same php script from the shell it’s do the same stops after few seconds .

  =Edit=

  Even when I tried to run ffmpeg from the command line and make it run on the background , I got same behavior the process stop after few seconds , ffmpeg continue running only if I wait for it output .

  Here my OS details :-

  DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"
  
  NAME="Ubuntu"
  
  VERSION="18.04.3 LTS (Bionic Beaver)"