it can be done using txt file or database. Just create a resource as db or lines from file . Now use PARSE LINE option in TOOLS .Parse in same order as data in txt file or db . Ex user,pass,email,cookie etc. Untick Reuse Resource will make load new line every time you parse.
Try printing ( with log) the command you are trying to execute, run it in a seperate command line to see if it's working properly.
since it's related to input I am suspecting the problem is with the youtube url you are providing
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For multithreading you should use resources. There are additional
settings for each resource, just double click it inside resources pane.
There you can fine tune your settings to achieve desirable behavior.
In your case you should set resource to use each line only once,
and set max symultanious usages to 1. Check other settiings too
to make it work the way you want.