[FFmpeg-user] Problem: extracted alpha plane from a grayscale PNG is shifted by 1 pixel to the left

I have a strange problem with extracting alpha plane from an grayscale PNG with alpha channel. So I have an image with alpha in it and use this command: ffmpeg -i 1-open-patch.png -vf alphaextract -pix_fmt gray testgray_alpha.png or ffmpeg -i 1-open-patch.png -vf alphaextract testgray_alpha

Re: [FFmpeg-user] Problem: extracted alpha plane from a grayscale PNG is shifted by 1 pixel to the left

2019-04-07 2:17 GMT+02:00, Mikhail V : > I have a strange problem with extracting alpha plane from an grayscale > PNG with alpha channel. > So I have an image with alpha in it and use this command: > > ffmpeg -i 1-open-patch.png -vf alphaextract -pix_fmt gray > testgray_alpha.png > or > ffmpeg -