I did some testing with the leaked 018a KitKat I am using.
First of all, I experienced no static or sound issues such as the LG G2 headphone bug (BTW, the G2 ROM in my sig has no such issue). I also have PowerAmp, and checked with both loudspeakers and my G2 stock headphones.
I also checked the video, using a 1080p copy of Avatar played on BS Player Free (better than MX or others IMHO). I watched a half hour, with headphones, and saw not one single glitch, and about 5-6% battery drain (screen at 45% brightness BTW). Although no other program was running, things such as email sync and others were left running normally.