[FFmpeg-user] Using Frei0r mixers

Stefano Sabatini stefasab at gmail.com
Sun Jan 13 14:54:30 CET 2013

On date Sunday 2013-01-13 10:48:35 +1100, Michael Rampe wrote:
> I have got the Frei0r filter set compiled and working.
> Looking through the Frei0r source, I notice that there are several
> "mixer" filters like "multiply" that take multiple inputs and use
> composite modes (like additive, subtractive, multiply etc.) to create
> the output.
> Is there any way to use these in a filter chain? (basically like the
> overlay avfilter - two inputs, one output)

Frei0r mixers are not supported yet, feel free to create a ticket for

> Is there any other way (current or in the works) to achieve the same
> thing with the base avfilter set?

Not that I think, but you should be more specific here.
> Michael

> p.s. Bonus question: does anyone know of a list of parameters for the
> different Frei0r filters? I have exhausted google on this and have
> reverted to reading the source for each filter which is very tricky to
> work out the bounds for some filters parameters especially when using
> the "double" data type.

-loglevel verbose will expose the (pretty terse) documentation in the
frei0r filters.
FFmpeg = Frightening & Formidable Miracolous Political Ecumenical Gargoyle

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