Script that uses youtube-dl to calculate total size of all videos in a playlist (also works with single videos).
pip3 install totalsize
Totalsize requires python 3.6+.
totalsize [-h] [-f FORMAT_FILTER] [-m] [-r NUM] [-c FILE] [--media]
[--size] [--duration] [--views] [--likes] [--dislikes]
[--percentage] [--cookies FILE]
URL
See https://github.com/ytdl-org/youtube-dl#format-selection for details on formats.
Specify the -m option for additional info on each video.
When specifying any of the raw data options, data will always be printed in this order:
media, size, duration, views, likes, dislikes, percentage