Quote Originally Posted by Valkyrie_Lenneth View Post
They do that only in non-network mode. And even then, that is not accurate. They either read network data, or they read the system's memory. They do not go off log files.
Yes, they do and yes, you can make accurate calculations using a .log file because there's always a live file being generated whenever you log into the game. If you didn't realize it, the default battle tab records all combat including damage as it happens live, which is where most of the parser are getting their information from as all that information is dumped immediately into the log. It's why when I've seen people using something like ACT while streaming there is usually a few seconds delay on the damage adjusting after burst or on initial hits.