On 2021-06-18 17:02, Timo Rothenpieler wrote:
On 18.06.2021 06:19, Gyan Doshi wrote:
Instead of a specific option for silencedetect, it would be
future-proof if it was an option called, say, metadata with a
constant for silencedetect to start with.
There are multiple per-frame analysis filters like blackframe,
blackdetect, freezedetect..etc and it will be easier to just extend
'metadata' with new constants
than to add a new option for each filter.
The only issue I see with that is a loss of flexibility.
I does not seem like you can pass parameters to variables in the
expression syntax.
So there would need to be two new parameters for the select filter
itself.
The start and the end marker metadata name.
But what if a user wanted to combine multiple detection filters?
I guess chaining multiple select filters would work, but can be pretty
annoying, depending on the usecase.
Yes, ideally, we would associate a function for metadata that allows it
to be used flexibly within the expr.
See how drawtext text parameter can accommodate various functions.
There's a limited example (last one) at
http://www.ffmpeg.org/ffmpeg-filters.html#Examples-62
Regards,
Gyan
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