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• How to get FFmpeg/sox working on heroku flask app ?

  6 mars 2019, par Arjun Akkiraju

  I am trying to convert an mp3 audio file from .mp3 format and multi-channel audio to a .flac format and single-channel audio in my python flask app. I am currently using the python wrapper for ffmpeg called ffmpy. Here is my code.

  from ffmpy import FFmpeg
  
  ff = FFmpeg(
  
          #executable = '/ffmpeg-20190304-db33283-macos64-static/bin/ffmpeg',
  
          inputs = {<input />: None},
  
          outputs = {'<output>': ['-ac 1']}
  
     )
  
     ff.run()</output>

  We have faced quite a few errors with this code segment when deploying the flask app to heroku (The code seems to work fine locally). The error I am running into is a ffmpy.FFExecutableNotFoundError: Executable 'ffmpeg' not found execption. To fix this, I tried downloading the ffmpeg build and set that as my executable (see the comment in my code above). I dragged that into my project directory and added the code above but the same error was throwing, except it said : ffmpy.FFExecutableNotFoundError: Executable 'ffmpeg-20190304-db33283-macos64-static/bin/ffmpeg not found. The name of the file was the executable not found in case that was unclear. We then tried adding buildpackages from the following two github repos : https://github.com/HYPERHYPER/heroku-buildpack-ffmpeg and https://github.com/integricho/heroku-buildpack-python-ffmpeg but neither buildpack solved the issue. When we ran heroku run bash and typed ffmpeg we got a command not found error. I then tried to install it with apt-get install ffmpeg on the heroku bash but that also failed. This is my requirements.txt file.

  Flask==1.0.2
  
  Flask-Cors==3.0.4
  
  gcloud==0.18.3
  
  google-api-core==1.7.0
  
  google-auth==1.6.2
  
  google-cloud-core==0.29.1
  
  google-cloud-speech==0.36.3
  
  google-cloud-storage==1.14.0
  
  google-resumable-media==0.3.2
  
  googleapis-common-protos==1.5.6
  
  gunicorn==19.9.0
  
  matplotlib==2.2.2
  
  lib==3.0.0
  
  grpcio==1.13.0rc3
  
  SpeechRecognition==3.8.1
  
  watson-developer-cloud==2.8.0
  
  wordcloud==1.5.0
  
  Werkzeug==0.14.1
  
  python-docx==0.8.10
  
  sox==1.3.7
  
  redis==3.2.0
  
  requests==2.21.0
  
  rq==0.13.0
  
  ffmpeg==1.4
  
  ffmpeg-python==0.1.17
  
  ffmpy==0.2.2
  
  sox==1.3.7

  ` We also tried to run a subprocess with the command sox :

  import subprocess
  
  
  
  subprocess.call(['sox', , '-r', '44100', '

  This kept saying sox: not found and thus I pivoted to ffmpeg. If there is a more efficient way to do this conversion please let me know as I’m new to both python and heroku. Any help is appreciated.

• A way to convert bitrate/format of audio files (between upload & storage to S3)

  5 octobre 2011, par Jonathan Coe

  Currently using PHP 5.3.x & Fedora

  Ok. I'll try to keep this simple. I'm working on a tool that allows the upload & storing of audio files on S3 for playback. Essentially, the user uploads a file (currently only allowing mp3 & m4a) to the server, and the file is then pushed to S3 for storage via the PHP SDK for amazon aws.

  The missing link is that I would like to perform a simple bitrate & format conversion of the file prior to uploading the file. (ensuring that all files are 160kbs and .mp3).

  I've looked into ffmpeg, although it seems that the PHP library only allows for reading bitrates and other meta, not for actual conversion.

  Does anyone have any thoughts on the best way to approach this ? Would running a shell_exec() command that performs the conversion be sufficient to do this, or is there a more efficient/better way of doing this ?

  Thanks in advance ! Any help or advice is much appreciated.

• Upload audio file, convert bitrate, save to S3 | server side options ?

  29 septembre 2011, par Jonathan Coe

  Currently using PHP 5.3.x & Fedora

  Ok. I'll try to keep this simple. I'm working on a tool that allows the upload & storing of audio files on S3 for playback. Essentially, the user uploads a file (currently only allowing mp3 & m4a) to the server, and the file is then pushed to S3 for storage via the PHP SDK for amazon aws.

  The missing link is that I would like to perform a simple bitrate & format conversion of the file prior to uploading the file. (ensuring that all files are 160kbs and .mp3).

  I've looked into ffmpeg, although it seems that the PHP library only allows for reading bitrates and other meta, not for actual conversion.

  Does anyone have any thoughts on the best way to approach this ? Would running a shell_exec() command that performs the conversion be sufficient to do this, or is there a more efficient/better way of doing this ?

  Thanks in advance ! Any help or advice is much appreciated.