AudioSlides.IO
Articles
tl;dr
Generate small videos with spoken text from Google Slides.
Using Amazon Polly, Google Slides and FFMpeg to create videos that can be updated at anytime by anyone. This project is written in Elixir.
The Prototype
For our prototype we decided to give Amazon Polly a try. It has a good and simple HTTP-API that allows you to convert text to speech really easily.
For the visual layer we just used Google Slides because they also provide a really good REST-API that allows you to easily export PNG of a slide. It’s also possible to get the speaker notes via the same API that could be the input for the Amazon Polly transformation.
The last step is to combine the generated voice output with the exported png image and produce a small video sequence. For this we just used a handy command line interface called FFMPEG. So the basic processing would look something like this:
Example Input & Output
As shown before we need a Google Presentation to start from. My input will be a short slide deck about the new release of Angular version 5.
Google Slides as Input
Generated Video as Output
How to start the project
To start your Phoenix server:
- Install dependencies with
mix deps.get - Create and migrate your database with
mix ecto.create && mix ecto.migrate - Install Node.js dependencies with
cd assets && npm install - Start Phoenix endpoint with
mix s
Now you can visit localhost:4000 from your browser.
Use with docker
Build the container
docker build -t audioslides .
Run via docker compose
Init the database
docker-compose run web mix ecto.setup
Run database + project
docker compose up
How to test
Run all tests
mix t
Run all test with integration test(ffmpeg, write files)
mix test.integration