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• How to create silent audio file in NodeJS ?

  27 avril 2020, par Vijay Singh Kholiya

  How can I generate a silent audio file in NodeJS. I have a duration variable which can be anything between 30sec to 50minutes and based upon this duration I need a silent file. I am using ffmpeglibrary for processing my audios : https://www.npmjs.com/package/fluent-ffmpeg.

  



  const ffmpegInstaller = require('@ffmpeg-installer/ffmpeg');
var ffmpeg = require('fluent-ffmpeg');


  



  ffmpeg code to convert WAV file to MP3 file :

  



  new ffmpeg({ source: /tmp/QNA1tts.wav})
    .withAudioCodec('libmp3lame')
    .withAudioFrequency(48000)
    .toFormat('mp3')
    .on('error', function(err) {
      console.log('An error occurred: ' + err.message);
    })
    .on('end', function() {
      console.log('Processing finished !');
    })
    .saveToFile('/tmp/android.mp3');


  



  I saw an answer that uses ffmpeg command line to do so, but I cannot figure out how can I use that in this package.

  



  ffmpeg -ar 48000 -t 60 -f s16le -acodec pcm_s16le -ac 2 -i /dev/zero -acodec libmp3lame -aq 4 output.mp3


  



  How to create silent .ogg audio file

  


• Converting m3u8 link to frame through FFMpeg

  30 octobre 2019, par LionKing

  I am trying to convert the .m3u8 live streaming link into frames instantly. I can convert the link to the frames by overwriting. But as much as I understood, FFMpeg reads the m3u8 links package by package, so this creates a standstill on the frames, frames doesn’t flow unceasingly.

  I have tried to overcome this issue by setting input and output framerates manually. The code I used is below.

  URL=https://trtcanlitv-lh.akamaihd.net/i/TRT1HD_1@181842/index_720p_av-b.m3u8
  
  
  
  ffmpeg -y -r 4 -i $URL -r 25 -update 1 image.jpg

  This allowed me to overcome standstill problem a bit but not really, but is there any way you can suggest that the frames can be written to image.jpg instantly and without any discontinuation.

  Thanks a lot.

• Tell pkg-config where to find packages on windows

  13 septembre 2016, par WirflBirfl

  I want to use the Haskell ffmpeg library under windows so I tried to install it via cabal.
  After downloading and extracting ffmpeg shared (64bit) version to C :\FFmpeg cabal complained that pkg-config was not installed.
  I downloaded it and moved it to the bin folder of MinGw. Now cabal complains that it can not find the pkg-config package libavutil.

  First part of the question :
  What is a pkg-config package ? Is it just the dll that comes with the shared version of ffmpeg ?

  Second part :
  I know pkg-config uses .pc files to describe where to look for packages and it uses the PKG_CONFIG_PATH variable to find .pc files. So how would a .pc file look when the libavutil dll is located in C :\FFmpeg\bin ?

  PS : The dll in FFmpeg\bin is named avutil-55.dll

  Thanks