Q: on/off humming buzzing noise on highway

humming/buzzing noise over 65mph, its not constant, on/off manner, coming from front driver side. I did balance and tire rotation, didn't help. I jacked the two front wheel and made a video, don't listen to the alarms beeping, I had to disconnect the ABS to make the wheels spin off ground.

https://www.youtube.com/watch?v=sTjB...ature=youtu.be

I couldn't hear the humming noise from outside unless I put my ear on the body, but its very notable when you sit inside the car and close windows, i did grasp the tire at the 12/6 position and tried to rock the tire and wheel in and out, no play. one mechanic told me it might be wheel bearing, isn't bad wheel bearing makes constant noise? in my case its on/off, another mechanic said it might be the transaxle, could that be true ? the CVT is working is shifting responding with no problem, could it work well and has a noise problem in the same time?
car is not under warranty, it has a rebuild title due to paint damage, never ben in accident

My car has 4000 miles.
My car has an automatic transmission.