ten seconds of ur own commentary will still make it a copyright violation. Underlying music will not change that; especially if u use copyrighted music. U need to create some value without using the extracted material. And the material u show must be directly related to ur conten
Learn your laws. If you just collect material and publish it, that is a copyright violation, no matter how short the individual scene and claim for fair use. Example: A Youtube video “Best action scenes evar”, which just clips action scenes from different movies together. Adding