Audio lambda

Project to process audio files with Audio Program Generator on AWS lambda.

Steps taken:

1. Create a virtual environment: python3.9 -m venv venv && source venv/bin/activate.

2. Pip install requirements as per file: pip install -r requirements.txt.

3. Zip the env up for upload to lambda:

    cd venv/lib/python3.9/site-packages
    zip -r9 lambda.pkg.zip *
    mv lambda.pkg.zip ../../../../
    cd ../../../..
   

   And add the actual lambda script:

    zip -g lambda.pkg.zip lambda.py
   

4. Now create the lambda function on AWS uploading the generated lambda.pkg.zip file.

5. Add this ffmpeg layer via this option. This got me this ARN: arn:aws:lambda:us-east-2:825951402381:layer:ffmpeg:1

6. When doing so you also need to set PYTHONPATH to $PYTHONPATH:/opt/python so ffprobe gets detected, that is under Lambda Configuration > Env variables

   I also gave the lambda 256 MB and a timeout of 2 minutes, and changed Handler to lambda.lambda_handler under Runtime settings because my script module is lambda.py.

7. Run a test event on Lambda. No need for payload, lambda.py just defaults to static input files if nothing is provided.

    (venv) $ python lambda.py
    100%|| 3/3 [00:00<00:00, 10.22it/s]
    {'status_code': 200, 'result_file': 'b64_encoded_audio_file_string'}