Automatically rotate youtube thumbnails, if you're not VIP enough for youtube to grant you the ability.

Follow this guide to obtain youtube API access: https://developers.google.com/youtube/registering_an_application
You need a GCP Account -> create a new project -> create a OAuth 2.0-Client for a Desktop Application (follow the guide above).
This will give you the client_id, project_id and client_secret which you need to insert into app/secrets.json opr download as a json file, just overwrite the existing one.

Start with running the script once manually, to setup your login information and install dependencies:

pip install virtualenv
virtualenv venv
source venv/bin/activate
pip install -r app/requirements.txt
python app/main.py anythinghere anythinghereaswell

In this step we only setup the login information, no need to provide a video_id or thumbnails, the script will fail with an error, but that is fine, as long as a new .pickle file was created. Otherwise repeat the steps above.

At this point you can test yoursetup on an unlisted video by running the following command, an absolute path to the directory containing the thumbnails is recommended:

source venv/bin/activate && \
python app/main.py <video_id> <path_to_thumbnails>

Create a Cronjob to periodically update your thumbnail

    crontab -e
    # change the paths and variables and insert this line:
    1 * * * * * * source </path/to/project>/venv/bin/activate && python </path/to/project>/app/main.py <video_id> <path_to_video_thumbnails>

This example updates the thumbnail once an hour for the provided video for ever.