# Each YouTube video has four generated images. They are predictably formatted as follows:
f"https://img.youtube.com/vi/{your_youtube_video_id}/0.jpg"
f"https://img.youtube.com/vi/{your_youtube_video_id}/1.jpg"
f"https://img.youtube.com/vi/{your_youtube_video_id}/2.jpg"
f"https://img.youtube.com/vi/{your_youtube_video_id}/3.jpg"
# The first one in the list is a full size image and others are thumbnail images. The default thumbnail image (i.e., one of 1.jpg, 2.jpg, 3.jpg) is:
f"https://img.youtube.com/vi/{your_youtube_video_id}/default.jpg"
# For the high quality version of the thumbnail use a URL similar to this:
f"https://img.youtube.com/vi/{your_youtube_video_id}/hqdefault.jpg"
# There is also a medium quality version of the thumbnail, using a URL similar to the HQ:
f"https://img.youtube.com/vi/{your_youtube_video_id}/mqdefault.jpg"
# For the standard definition version of the thumbnail, use a URL similar to this:
f"https://img.youtube.com/vi/{your_youtube_video_id}/sddefault.jpg"
# For the maximum resolution version of the thumbnail use a URL similar to this:
f"https://img.youtube.com/vi/{your_youtube_video_id}/maxresdefault.jpg"
# All of the above URLs are available over HTTP too. Additionally, the slightly shorter hostname i3.ytimg.com works in place of img.youtube.com in the example URLs above.
# Alternatively, you can use the YouTube Data API (v3) to get thumbnail images.