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• Unable to use Multithread for librosa melspectrogram

  15 avril 2019, par Raven Cheuk

  I have over 1000 audio files (it’s just a initial development, in the future, there will be even more audio files), and would like to convert them to melspectrogram.

  Since my workstation has a Intel® Xeon® Processor E5-2698 v3, which has 32 threads, I would like to use multithread to do my job.

  My code

  import os
  
  import librosa
  
  from librosa.display import specshow
  
  from natsort import natsorted
  
  import numpy as np
  
  import sys 
  
  # Libraries for multi thread
  
  from multiprocessing.dummy import Pool as ThreadPool
  
  import subprocess
  
  pool = ThreadPool(20) 
  
  
  
  songlist = os.listdir('../opensmile/devset_2015/')
  
  songlist= natsorted(songlist)
  
  
  
  def get_spectrogram(song):
  
      print("start")
  
      y, sr = librosa.load('../opensmile/devset_2015/' + song)
  
  
  
      ## Add some function to cut y
  
      y_list = y
  
      ##
  
  
  
      for i, y_i in enumerate([y_list]): # can remove for loop if no audio is cut
  
          S = librosa.feature.melspectrogram(y=y, sr=sr, n_mels=128,fmax=8000)
  
          try:
  
              np.save('./Test/' + song + '/' + str(i), S)
  
          except:
  
              os.makedirs('./Test/' + song)
  
              np.save('./Test/' + song + '/' + str(i), S)
  
          print("done saving")
  
  
  
  pool.map(get_spectrogram, songlist)

  My Problem

  However, my script freezes after finished the first conversion.

  To debug what’s going on, I commented out S = librosa.feature.melspectrogram(y=y, sr=sr, n_mels=128,fmax=8000) and replace it by S=0.
  Then the multi-thread code works fine.

  What’s wrong with the librosa.feature.melspectrogram function ? Does it not support multi-thread ? Or is it a problem of ffmpeg ? (When using librosa, it asks me to install ffmpeg before.)

• FFmpeg seems to be version conflict

  4 novembre 2014, par user3177342

  I am using git version of ffmpeg( renewed after old version succesful using) , when i try to compile my project i get

   /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:376: undefined reference to `swr_is_initialized'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:222: undefined reference to `swr_is_initialized'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_init_resample':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:163: undefined reference to `swr_init'
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:169: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:236: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_flush_resample':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:117: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:408: undefined reference to `swr_close'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_flush':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:557: undefined reference to `swr_close'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_close':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:579: undefined reference to `swr_free'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_init':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:629: undefined reference to `swr_alloc'

  Seems to be version conflict ? but how to delete wrong libs ? they seem to be todays build.

  ls -l /usr/local/lib
  
  -rw-r--r-- 1 root root  136509684 may   29 14:47 libavcodec.a
  
  -rw-r--r-- 1 root root    1853574 may   29 14:47 libavdevice.a
  
  -rw-r--r-- 1 root root    9689456 may   29 14:47 libavfilter.a
  
  -rw-r--r-- 1 root root   46282270 may   29 14:47 libavformat.a
  
  -rw-r--r-- 1 root root    2092250 may   29 14:47 libavutil.a
  
  -rw-r--r-- 1 root root      67942 may   12 11:29 libBasicUsageEnvironment.a
  
  -rw-r--r-- 1 root root    2200164 apr.  10 10:11 libfftw3.a
  
  -rwxr-xr-x 1 root root        872 apr.  10 10:11 libfftw3.la
  
  -rw-r--r-- 1 root root      94188 may   12 11:29 libgroupsock.a
  
  -rw-r--r-- 1 root root    2236084 may   12 11:29 libliveMedia.a
  
  -rw-r--r-- 1 root root     546506 may   29 14:47 libswresample.a
  
  -rw-r--r-- 1 root root    4813716 may   29 14:47 libswscale.a
  
  -rw-r--r-- 1 root root      14588 may   12 11:29 libUsageEnvironment.a

• FFMPEG draw text with change over time [duplicate]

  18 avril 2020, par bleepbloopbleep

  Hi i am working on a project that will get metadata from an mp3 file and then stream the file with text displaying the Artist Name and Song Title from the metadata.

  



  In order to get around a bug I concatenated the audio files into one larger file and got the meta data from each track before the concatenation.

  



  While streaming I want to display the artist name and song title while the track is playing.

  



  The current text script for just the text looks like this :

  



  drawtext=text='Artist: ARTISTNAME:fontfile=PATH/TO/FONT/FILE:fontsize=(w * 0.03333333333333333):bordercolor=#000000:borderw=1:fontcolor=#FFFFFF:y=(h * 0.15):x=(w * 0.02),drawtext=text='Song: NAME’OFSONG:fontfile=PATH/TO/FONT/FILE:fontsize=(w * 0.03333333333333333):bordercolor=#000000:borderw=1:fontcolor=#FFFFFF:y=(h * 0.25):x=(w * 0.02)"


  



  How can I add time duration element to the FFMEG script ?

  



  Thanks !