[FFmpeg-devel] [PATCH] avformat/concat: fix missing metadata

[Steven Hartland]

I'm not sure we're on the same page, so let me try and clarify.

The files have multiple tracks, the standard audio and video and 3 metadata
tracks. I'm using the command line option -map 0:m:handler_name:"<name>" to
identify the tracks to copy. Given a single file this works as expected,
but as soon as concat has multiple files the track metadata is lost and the
handler_name match fails due to this early return.

Each of the tracks I'm selected are able to be concatenated just fine, much
like the a/v tracks. It's not about the file metadata, it's the track
metadata which is needed for track identification which I'm looking to
preserve.

Does that make sense?

   Regards
   Steve

On Sun, 3 Jul 2022 at 14:50, Nicolas George <george at nsup.org> wrote:

> Andreas Rheinhardt (12022-07-03):
> > > For example, with your change, if you concatenate a file with metadata
> > > "start_time=12:00" and another with "start_time=12:01", it will
> generate
> > > a file with both metadata entries instead of just the first one as
> would
> > > be desirable.
>
> > Actually, the newer entry will overwrite the older entry; if you want
> > multiple keys with the same value, you have to use the AV_DICT_MULTIKEY
> > flag.
>
> I stand corrected, thanks. This is still not the most logical behavior,
> though.
>
> Regards,
>
> --
>   Nicolas George
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