ouch pianowolfi for playing erlking for..hundreds of times.
Lol but I said that I was often cheating. But I learned that I definitely prefer other Schubert songs, like "Der Wegweiser" (my absolute favorite one) or, well the whole "Winterreise" actually .
You might want to take a look at Seymour Fink's "Mastering Piano Technique". He goes into a lot of detail descibing 2 basic octive techniques (forearm bounce and hand bounce) then shows how you combine the 2 where you start groups with a forearm drop and continue with hand bouncing. While hand bouncing raise the wrist slightly. There's some excercises on p163 & 164.Tim
Here is a video of some random woman teaching how to play the octaves in the Erlkonig:https://www.taubman-institute.com/html/shaping1.mpgSince she has an accent, it sounds like she knows what she's doing.
Well, in America, an accent gives you instant credibility. We are naive like that.When I was in music school, the foreign students remarked on it--they said they couldn't believe how everyone instantly respected them because of their accent.
It looks like she's using the arm+wrist technique that Seymour Fink describes, although she doesn't describe it in those terms. She's not going very fast, so she probably hasn't thought about it in those terms, either.
You're right, she's not going very fast. I feel sorry for her.