MiniDLNA

Hi, I have been using minidlna for more than one year with great results and I'm now trying to solve a problem. I want to know which programs have been watched by my son in order to remove those already seen. I have installed the last version (1.0.25) on Linux/Debian Squeeze on Arm. I have seen that there was a new option (compared to the 1.0.22 that I used previously) called log_level but I haven't found any explanation about its syntax. What I would like to know is which program was seen and for how long, which means having at least a tag at the beginning and another tag at the end: sometimes you can watch the first minutes of a program and stops there; it doesn't mean that you saw the program. However, if you watched most of it, it's more relevant. So, I try to know if the log_level option with a later analysis of the minidlna.log file can be used for this purpose or if I need to change the source C to get what I want. If anybody's got an idea, I will be very interested. Thanks in advance.