Creation of playlist to fake-split a full-album video
Instead of using print() you can add a newline character \n at the end of the previous printed string:

print('with the same name as the album file.\n')
print('The playlist will be saved in current directory.')


When you ask for a filename, you don't do any input validation. What if they enter an empty string? What if their path isn't real? I'm not familar with pathlib, and also not sure what you'd want to do. You could create an infinite loop that will only break when the user enters a valid/existing path. Alternatively you could end the program if an invalid path appears. You definitely shouldn't ignore errors or leave it to Python to raise whatever errors it sees fit. You should make explicit choices about what happens.

When you're appending the string to playlist_entries, it's quite hard to read. You would do better to define an ENTRY_TEMPLATE string at the top of the file which you just use and format when appending.

Python truthiness can be very useful, but in this case if i is liable to confuse people. I would suggest either an explicit statement like i != 0 or a comment.

    if i:  # Not the first entry