Youtube video ids are just 64 bit numbers that have been base64 encoded with a slightly modified character set. Here is an example of a Python script that converts the Youtube id back to a 64 bit int representation:
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import base64
import struct
yt_id = '_ZPpU7774DQ' + '=' # Add padding
yt_id = yt_id.replace('-','+').replace('_','/')
yt_id = struct.unpack('L', base64.b64decode(yt_id))[0]
print(yt_id)
2
7
Whoops -- my bad. L is 4 bytes. We want 8. So use this instead:
yt_id = struct.unpack('Q', base64.b64decode(yt_id))[0]
So we're saving 3 bytes. Still a bit of a savings.
