This happens only on DVDs I burn using DVDA.
TV Panasonic Plasma DVD
Player: Sony Blu Ray player
Whenever I select an item in the DVD menu, the video starts with an annoying message informing me about what audio codec is being used. Why is this? I have never seen it on DVDs I buy in the shop.
Ingvar
Start with the manual for your Blu-ray player. If you don't find anything there, check the manual for your TV.
I don't know why you'd get such a message only with burned DVDs, let alone DVDs created by DVDA, but it's almost certainly a "feature" of one device or the other. I know of nothing in DVDA (or any other authoring app) that would cause that.