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• Parse and drop gain control data, so that SSR packets decode.

  16 février 2018, par Dale Curtis

  Parse and drop gain control data, so that SSR packets decode.
  This will result in poor quality audio for SSR streams, but they
  
  will at least demux and decode without error ; partially fixing
  
  ticket #1693.
  This pulls in the decode_gain_control() function from the
  
  ffmpeg summer-of-code repo (original author Maxim Gavrilov) at
  
  svn ://svn.mplayerhq.hu/soc/aac/aac.c with some minor modifications
  
  and adds AOT_AAC_SSR to decode_audio_specific_config_gb().
  Signed-off-by : Dale Curtis <dalecurtis@chromium.org>
  
  Co-authored-by : Maxim Gavrilov <maxim.gavrilov@gmail.com>
  

  • [DH] libavcodec/aac.h
  • [DH] libavcodec/aacdec_template.c

• Convert audio files to mp3 using ffmpeg [closed]

  24 mars, par Hrishikesh -Rishi- Choudhari

  I need to convert audio files to mp3 using ffmpeg.

  



  When I write the command as ffmpeg -i audio.ogg -acodec mp3 newfile.mp3, I get the error :

  



  FFmpeg version 0.5.2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: 
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 1 / 52.20. 1
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  built on Jun 24 2010 14:56:20, gcc: 4.4.1
Input #0, mp3, from 'ZHRE.mp3':
  Duration: 00:04:12.52, start: 0.000000, bitrate: 208 kb/s
    Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 256 kb/s
Output #0, mp3, to 'audio.mp3':
    Stream #0.0: Audio: 0x0000, 44100 Hz, stereo, s16, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
Unsupported codec for output stream #0.0


  



  I also ran this command :

  



   ffmpeg -formats | grep mp3


  



  and got this in response :

  



  FFmpeg version 0.5.2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: 
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 1 / 52.20. 1
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  built on Jun 24 2010 14:56:20, gcc: 4.4.1
 DE mp3             MPEG audio layer 3
 D A    mp3             MP3 (MPEG audio layer 3)
 D A    mp3adu          ADU (Application Data Unit) MP3 (MPEG audio layer 3)
 D A    mp3on4          MP3onMP4
 text2movsub remove_extra noise mov2textsub mp3decomp mp3comp mjpegadump imxdump h264_mp4toannexb dump_extra


  



  I guess that the mp3 codec isn't installed. Am I on the right track here ?

  


• finding speed and tone of speech in an audio using python

  1er février 2018, par kRazzy R

  Given an audio , I want to calculate the pace of the speech. i.e how fast or slow is it.

  Currently I am doing the following :
  
   convert speech to text and obtaining a transcript (using a free tool).
  
   count number of words in transcript.
  
   calculate length or duration of file.
  
   finally, pace = (number of words in transcript / duration of file).

  However the accuracy of the pace obtained is dependent purely on transcription , which I think is an unnecessary step.

  Is there any python-library/sox/ffmpeg way that will enable me to

  • to calculate, in a straightforward way,the speed/pace of talk in an audio
  • dominant Pitches/tones of that audio ?

  I referred : I referred : http://sox.sourceforge.net/sox.html and https://digitalcardboard.com/blog/2009/08/25/the-sox-of-silence/