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  • ffmpeg convert white background to transparent

    7 janvier 2021, par tony

    Hello i took a picture of a framed sheet with my camera and i'm trying to convert the white background to transparent without using the colorkey filter. It is meant to be for a video using a number of frames overlayed to a static background but i started with only one png to see if it works.

    


    So i started making 1 palette with only 2 colors with -f lavfi (black and white) and 1 palette to add the transparency

    


    ffmpeg -i blackwhite.png -filter_complex "[0:v]split[a][b];[a]palettegen=max_colors=4[out1];\
                            [b]palettegen=max_colors=4:reserve_transparent=on:\
                            transparency_color=#FFFFFF[out2]" \
    -c:v png \
    -map [out1] paletteNormal.png \
    -map [out2] paletteTransparent.png 


    


    then i mapped the png that i want to convert to the first palette to make uniform colors and then to the second to add the transparency and i overlayed the result to a background image that should be red

    


    ffmpeg -i image.png -i paletteNormal.png -i paletteTransparent.png -i background.png \
     -filter_complex "[0:v][1:v]paletteuse=dither=bayer[a],\
     [a]split[a1][a2]; \
     [a1][2:v]paletteuse=alpha_threshold=128[c];[3:v][c]overlay[d]" \
    -map [a2] -c:v png out.png \
    -map [d] -c:v png out1.png


    


    the png mapped to the first palette comes as it should be, pure black and white
the second comes with no transparency at all and covers the background
i tried different combinations like to make the second palette of 255colors..... nothing

    


    what am i doing wrong ? i know it can be done
i went to this site and i made an alpha channel in 5 seconds with a lot of grief and rage.linkOfPain

    


    p.s for a video from png frames what codec should i use ?

    


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