ffmpeg image and flask app in two different containers in Docker compose. How do I use ffmpeg in flask app?

Here is my docker compose yml file:

ffmpeg:
    image: jrottenberg/ffmpeg:ubuntu
    tty: true
flask_app:
  build: ./flask_app
  #image: conorquinn01/composeapp
  command: python ./flask_app/app.py
  ports:
   - "5000:5000"
  volumes:
   - .:/muse_compose2
  links:
    ['ffmpeg']

Not sure how to do this. Thanks.

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