Add tests for s3 inputs for FfmpegAdapter and PassThroughAdapter #133
Description
The tests for the FfmpegAdapter and PassThroughAdapter are only for file input urls but these adapters can also handle s3 input urls. There should be tests that exercise the special handling for s3 urls.
It might be good to setup a docker environment with minio running to test these without mocking all of the web interactions.