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

[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....