On Mon, Apr 06, 2020 at 06:39:16 -0400, Mark Filipak wrote:
> ffmpeg -i input -i logo -filter_complex 'overlay=10:main_h-overlay_h-10'
> output
> ^
> What is ..................................... this?
> It's not documented.
In the filters syntax, if you don't name the option, the order of
values implies their meaning.
In other words:
filtername=option1=1:option2=42:option3=yes
can be replaced with
filtername=1:42:yes
if and only if these are the first three documented options.
(On the other hand, you can always change the order of options, if you
name them properly:
filtername=option27=something:option2=42:option3=yes:option1=1
)
I don't recommend to use shorthand, except in cases where it's really clear.
For example, I use
fps=25
instead of
fps=fps=25
because it's faster to write and I know what I'm doing.
For the overlay filter, the first two options are x and y.
So what you see could be written as:
overlay=x=10:y=main_h-overlay_h-10
Cheers,
Moritz
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