Title says it all. I have an iPhone 4s (latest iOS 8.1). Latest VLC although it has been going on ever since I can remember having VLC installed.
My phone doesn't freeze, it just keeps playing. The sound was audible to the other end (caller) quite clearly. I changed some settings (probably time stretcing audio to ON, audio playback in background to ON) and it is no longer audible on the other end. Nevertheless, I can still hear the playback while on a call
Note:
Not sure if starting a new thread is a good idea, but didn't find anything here that's quite the same. I have to say that it is really clear on the other end as well. But i would prefer not to let others know what I am listening to.