ios - How to use kCGImageDestinationLossyCompressionQuality in saving GIF from video -

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i using regift (https://github.com/matthewpalmer/regift) library convert videos gifs, don't how large file size of saved gifs are. library using cgimagedestinationaddimage function add each frame of video file, , 1 of parameters of function dictionary lets specify properties of image, , 1 of properties can set called kcgimagedestinationlossycompressionquality want use try reduce file size.

this original code in library defines properties dictionary passed cgimagedestinationaddimage function:

let frameproperties = [kcgimagepropertygifdictionary string: [     kcgimagepropertygifdelaytime string: delaytime ]]

i'm trying modify dictionary include kcgimagedestinationlossycompressionquality property:

let frameproperties = [ kcgimagedestinationlossycompressionquality string: 0.5, kcgimagepropertygifdictionary string: [     kcgimagepropertygifdelaytime string: delaytime ]]

but when try re-converting same video file gif, there no difference in quality or file size, means setting property had no effect. not setting correctly? or property have no effect gif frames?

i don’t believe can set kcgimagedestinationlossycompressionquality animated gif (going off this answer). might able try compressing or resizing movie file before converting gif.


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