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• why I can't compile x264 or ffmpeg downloaded from git

  4 avril 2013, par Monjura Rumi

  It has been just a few days that I am using x264, ffmpeg and trying to take help from codes in git. I am always having some peculiar problem. It seems like no one or few people faced such problems. Here is one of those problems. If I download x264 or ffmpeg using git then I could not compile that source code. At first terminal will show ./configure: Permission denied. Then If I change permission of configure file using chmod 755 command then it will show ./configure: /bin/bash^M: bad interpreter: No such file or directory. To build x264 and ffmpeg I have followed this link https://github.com/lince/libffmpeg-c/wiki. My attempt to compile x264 has failed. Can you please tell me how can one use source code downloaded from git ?

• #/bin/sh in one line

  27 juillet 2012, par GoodGuyGreg

  I'm working on some Haskell project using FFmpeg. I need to batch create from a media folder with MP4 files and create screenshots from all of them. I got the code and am using it on a terminal in Unix. It works, but how do I make it in one line to be executed in system "xxxx" in Haskell ?

  If not using several system"xx"...

  #/bin/sh
  
  for i in $(ls *.mp4)
  
  do
  
      ffmpeg -i $i -vframes 7 -y -ss 10 -s 150x150 -an -sameq -f image2 -r 1/5  $i%1d.jpg
  
  done

  I tried :

  import System.Cmd
  
  function = do{system "#/bin/sh";
  
  system "for i in $(ls *.mp4)";
  
  system "do";
  
  system "ffmpeg -i $i -vframes 7 -y -ss 10 -s 150x150 -an -sameq -f image2 -r 1/5  $i%1d.jpg";
  
  system "done";}

  but it gives a error :

  -vframes: No such file or directory
  
  /bin/sh: Syntax error: "done" unexpected

• How can i get constant output bitrate for fluent-Ffmpeg conversion of m3u8 video stream to audio stream

  24 octobre 2019, par Rushikesh Phalke

  I am using fluent-FFmpeg to convert m3u8 video stream to audio stream. the audio stream I am getting as output has a variable bitrate. How can I achieve getting constant bitrate instead of a variable bitrate ?

  I have tried providing

  .addOption(’-b:a 48k’)

  .addOption(’-bufsize 48k’)

  to keep constant bitrate of 48kbps. But that didn’t work.

  Here is the code sample :

  const ffmpeg = require('fluent-ffmpeg');
  
  const { Transform } = require('stream');
  
  
  
  let dest = new Transform({
  
      transform: (chunk, enc, next) => {
  
          //chunk duration
  
          next(null, chunk);
  
      }
  
  }).on('data', () => {});
  
  
  
  
  
  let m3u8_url = 'https://fuel-streaming-prod01.fuelmedia.io/v1/sem/40f15d3b-689f-48a5-9c61-a4f9583ed619.m3u8';
  
  
  
  let command = ffmpeg()
  
      .format('flac') // required for working with streams
  
      .on('start', function() {
  
          console.log('ffmpeg : processing Started');
  
      })
  
      .on('progress', (progress) => {
  
          console.log('ffmpeg : Processing');
  
      })
  
      .on('end', () => {
  
          console.log('ffmpeg : Processing finished !');
  
      })
  
      .on('error', (err) => {
  
          console.log('ffmpeg : ffmpeg error :' + err.message);
  
      })
  
      //.addOption('-b:a 48k')
  
      //.addOption('-bufsize 48k')
  
      .output(dest) //transform stream
  
      .audioBitrate('48k')
  
      .audioCodec('flac') // needed for getting proper metadata
  
  
  
  command.run();