On 2023-02-14 03:35 pm, Anton Khirnov wrote:
Quoting Gyan Doshi (2023-02-11 12:02:51)
The FLV format can store metadata as numbers which are used and handled
by many streaming platforms.
Now, metadata values can be sent as AMF Number type if
1) tag key starts with "num_"
2) value is scanned and can be represented as a double.
Written tag will have "num_" prefix removed if written as AMF Number.
Using the normal metadata dict for structured data seems hacky to me.
Wouldn't it be better to add a private dict-type muxer option for this?
The numerical metadata, like other string meta in FLV can change during
streaming, so it will be
reloaded and refreshed. Once you suggested to shift the loading metadata
from file + reload options
to fftools, this was the way to identify such metadata, since format
contexts and AVStream only support
one AVDictionary and entries will have to be commingled
And this isn't really structured data. We are re-encoding how some of it
is stored. It is still inputted
by the user as strings. The prefix is a cheap hack to clearly identify
such keys.
(The other option would be add AVDictionary value 'types' and all
associated signalling and tooling,
which seems useful in the long run but overkill for this.)
Regards,
Gyan
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