The ampersand & is a special character that needs to be escaped when passed as an argument. You can surround the argument with double qoutes "" or escape the ampersand with a caret ^, so either
Code:
ffplay "http://00.0.0.0/l/playlist.m3u8?d=2&p2=05d9a598"
or
Code:
ffplay http://00.0.0.0/l/playlist.m3u8?d=2^&p2=05d9a598
should work.