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Automatically convert audio files using ffmpeg

This sample uses ffmpeg / fluent-ffmpeg and automatically converts audio files that are uploaded to Cloud Storage to FLAC file format with mono-channel audio @ 16000hz.

Functions Code

See file functions/index.js for the audio conversion code.

The audio conversion is performed using ffmpeg. The audio is first downloaded locally from the Cloud Storage bucket to the tmp folder using the google-cloud SDK.

The dependencies are listed in functions/package.json.

Trigger rules

The function triggers on upload of any file to your Firebase project's default Cloud Storage bucket.

Deploy and test

To deploy and test the sample:

  • Create a Firebase project on the Firebase Console and visit the Storage tab.
  • Get the code, for instance using git clone https://github.com/firebase/functions-samples
  • Enter the correct directory cd functions-samples/ffmpeg-convert-audio
  • Setup the CLI to use your Firebase project using firebase use --add and select your Firebase project
  • Deploy your project's code using firebase deploy
  • Go to the Firebase Console Storage tab and upload an audio. After a short time a converted audio with the same name but a _output.flac suffix will be created in the same folder (make sure you refresh the UI to see the new file).

Notes

  • Take into account that the audio files produced should not exceed the size of the memory of your function.
  • The audio conversion could take a certain amount of time, increase the timeout of your function using the cloud functions webgui so the function can run for a longer time.