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• How to get rec script of SOX to work on Android ?

  1er mai 2013, par Arif Nadeem

  I built sox for Android and I am using the generated binary files i.e. sox, rec, play and soxi generated directly in my app by installing them as binaries within my app.

  I am able to invoke commands using sox directly however I have a problem in invoking rec command.

  I used the following command, rec -r 8000 -c 2 output.wav
  But it fails saying that sox is not found or sox is expected but is not found.

  The above rec command works perfectly in Ubuntu when I use it in command line

  Please note that I am able to use operation related to sox binary successfully, but I am unable to use commands related to rec binary.

  Initially I thought the problem may be because of permissions imposed by Android so I included these permissions in manifest.xml but to no avail.

  I did some research and got this link, it says in section Using Sox to Play and Record that there might be some Linux systems which do not accept rec command directly.

  I followed his suggestion and appended my commands with padsp etc, but it still doesn't work.

  So my question is how do I invoke rec command successfully on Android system, has anyone tried this before ?

• Extracting subtitles of a mkv file using ffmpeg while downloading

  19 août 2020, par Tim Untersberger

  I am trying to stream a mkv file to a webpage, which is being downloaded using WebTorrent. The video file has ASS/SSA embedded subtitles. I am using electron to display the video, which uses chromium without proprietary codec support, so I have to use the following html :

  


  <video controls="controls">&#xA;  <source src="video.mkv" type="video/webm">&#xA;<video></video>&#xA;</source></video>

  


  Since chrome supports webm and they use the same container, I can watch the video with audio. Webm doesn't support embedded subtitles, so the subtitles of the video get ignored.

  


  I am extracting the subtitles using the following command :

  


  ffmpeg -i video.mkv -map 0:2 sub.vtt


  


  This works fine, but requires the file to be downloaded completely. Is it possible to extract the subtitles while the file is being downloaded, so that I can begin streaming the video together with the subtitles as soon as possible ?

  


• Possible to output FFMPEG progress via Node ?

  14 juin 2016, par ErraticFox

  I am building a desktop app with Node.js and Electron. This app is only client side, there is no servers and uses FFMPEG. I’ve seen there’s a way to display the progress via PHP, but I was wondering if I was able to do this via Node.

  I found this, but I can’t seem to get it to output progress. The code below is what I am using for that Node Module and the console only logs [] after conversion is complete.

  var inputDir = uploadFile.files[0].path
  
          var spawn = require('child_process').spawn
  
          var ffmpegBin = require('ffmpeg-static'),
  
              progressStream = require('ffmpeg-progress-stream')
  
          var params = [
  
              '-y',
  
              '-i',
  
              inputDir,
  
              "C:\\Users\\ErraticFox\\Desktop\\output.mp3"
  
          ]
  
  
  
          ffmpeg = spawn(ffmpegBin.path, params);
  
          ffmpeg.stderr
  
              .pipe(progressStream(120))
  
              .pipe(concat(function(data) {
  
                  results = data;
  
                  console.log(data)
  
              }))