This is Hitler testifying as a witness during a 1931 trial of four SA men. The trial was known as the Eden Dance Palace trial. Hans Litten was one of the prosecutors who grilled Hitler in a three-hour cross-examination where, in my opinion, he didn’t lay a glove on Hitler.
The judge held that most of Litten’s questions of Hitler were irrelevant. The topic with Hitler for the most part was his use of the term “roll commando” in an article Hitler wrote which was viewed as inciting brutality and/or murder. Hitler testified that the Party was peaceful and would only ever use legal means to achieve ends.
Hitler viewed his testimony as crucial to his career, since it could be misquoted by enemies later, and so brought his own stenographer to the trial to record his testimony.
Ultimately, the judge credited Hitler’s testimony as truthful.
Later, Hans Litten ended up in Dachau.