does mp4 support timed metadata

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does mp4 support timed metadata

qw
Hi,


I have one question:


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


Thanks!


Regards


Andrew
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Re: does mp4 support timed metadata

kumowoon1025
> 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 do.

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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Re: does mp4 support timed metadata

qw
Hi,


I read one article from microsoft, i.e. https://docs.microsoft.com/en-us/azure/media-services/media-services-specifications-live-timed-metadata


azure will put timed metadata into fmp4, and will support various formats of timed metadata. As mpegts demuxer/muxer in ffmpeg support id3 tag, does ffmpeg's mp4 support the feature?


Thanks!


Regards


Andrew



At 2019-11-01 02:15:09, "Ted Park" <[hidden email]> wrote:

>> 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 do.
>
>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.
>_______________________________________________
>ffmpeg-user mailing list
>[hidden email]
>https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
>To unsubscribe, visit link above, or email
>[hidden email] with subject "unsubscribe".
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