Dear sneaker_ger
I don't think NAME=BPS and STRING=<SOME_BPS> is working, when I use NAME=TITLE and STRING=<SOME_TITLE> it's OK.
I just want to put BPS to be custom thats all and it's for my private purpose. But as I said earlier I cannot manage to do it. Maybe I am doing something wrong with this .xml file. Maybe you will try on any media file of your own and change BPS to any other value.
Thank you for your time and help.
EDIT
OK, I know what was the problem with BPS

I want to set 640kb/s and in string I put 640 and everytime I have a result of 0kb/s. BPS should be set as 640000 for 640kb/s. My fault, everything works as it should. Thank you once again for your help.
Sincerely