I understand Richard’s request though, based on practical terms as usual: there are no other formats for audio/video that aren’t encumbered by nasty patents.
Is OGG a standard? Probably not. Is it an open unencumbered format? I think so. Will my data be safe for future use? This is the most difficult question to answer: one can say that since the code is out there you can always write the decoder. But real life is more complex than that.