Bottom bracket and crank
First posting here. Recently my bike started making a creaking whine when I put enough force into the left pedal. Thinking it was the ball bearings, I tried to spray some grease into the bottom bracket, but it didn't help at all. I'm not sure whether it's the bottom bracket or maybe the crank itself. It's a bit expensive to have a mechanic look at it locally, and I was wondering if someone here could take a look beforehand. I made a short 8sec video of it (mostly for the creaking sound) and attached it.
Do you think that it's the bottom bracket or the crank? I just wanted to have an informed opinion when I go talk to the bike mechanic about it, that's all.