> does mp4 support timed metadata, such as id3 timed metadata?

I think you asked about timed id3 before as well, for Transport Streams and 
rtmp previously, But only ever provide a vague picture of what you’re trying to 

That’s your prerogative of course, but I’m limited to giving general advice to 
(extremely) general situations you present… And I fear you’re getting further 
and further away from what would be reasonable practice in however you 
implement timed metadata in whatever project you’re working on.

First of all, there are several flavors of the “mp4” container. If you use the 
most general specification for it (which I think corresponds to -f mov for some 
reason) then you can pretty much put any stream in an mp4, though you might 
have to specify the codec tag, and if there’s no encoder, just make it copy 
unknown codec streams.

But why?? I’m curious what you’d use a containerized file like mp4 with a 
private stream with a couple packets at best, which might not even be decoded 
right for.
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