[FFmpeg-user] curves filter and tmix filter, suggestions for improvement

Michael Koch astroelectronic at t-online.de
Sat Feb 2 20:34:39 EET 2019

Am 02.02.2019 um 19:28 schrieb Paul B Mahol:
> On 2/2/19, Michael Koch <astroelectronic at t-online.de> wrote:
>> Am 02.02.2019 um 19:01 schrieb Paul B Mahol:
>>> On 2/2/19, Michael Koch <astroelectronic at t-online.de> wrote:
>>>> Hi all,
>>>> I have two suggestions for improvement:
>>>> 1. It would be nice if the curves filter could import curves files from
>>>> GIMP. GIMP can export curves files in two different formats, either the
>>>> default format or the "old curves file format". For the old format I
>>>> have a selfmade C# converter to the *.acf format which FFmpeg's curves
>>>> filter can import. But it would be better if FFmpeg could directly
>>>> import GIMP's newer curves format, because it contains more informations.
>>>> 2. For the tmix filter it would be nice if it would accept "frames = 1",
>>>> meaning "no mixing at all, just a bypass mode". Then it's easier to
>>>> switch the filter on and off with a variable in batch file.
>>>> Please add to the documentation: "If the weights parameter is not
>>>> specified, the default is 1 for each frame".
>>> This is not correct, default is one as described in documentation.
>> The documentation doesn't even mention that it's possible to omit the
>> weights parameter.
>> But it is possible, and I'm quite sure that all default weights are 1.
>> https://www.ffmpeg.org/ffmpeg-all.html#tmix
> If you omit parameter you get default values....

Yes, of course. But it's not written in the documentation that all 
default weights are 1. It's an undocumented feature that you can omit 
the weights parameter.


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