Which tool can turn videos into image sequences of png files that have the smallest file size?
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https://forum.videohelp.com/threads/413007-Smallest-PNG-File-Size
On windows probably optipng or pngcrush . very slow on the highest optimization settings. Imageoptim and squash supposedly do better for mac programs, there are some tests posted on a couple of sources
But I tried pnggauntlet for windows today, and it did slight better than optipng and pngcrush on the 1920x1080 anime video posted in your other thread. Very slow because it can run optipng, pngout and deflopt. But it has a GUI, easy to use
https://pnggauntlet.com/
You're looking at minutes per frame for these lossless compression, except for the 1st and webp. jpegxl below effort 7 is pretty fast too. eg. Diminishing returns - sometimes -o 3 for optipng will return the same filesize but be 10x faster
avspmod png (starting png)
2,260,231 bytes
pngcrush -reduce -brute
2,172,917 bytes
optipng -o7
2,172,869 bytes
pnggauntlet
2,116,440 bytes
webp lossless
1,766,668 bytes
jpegxl lossless effort7
1,485,715 bytes
jpegxl lossless effort9
1,452,042 bytesLast edited by poisondeathray; 15th Jan 2024 at 15:31.
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ffmpeg
Those used "-distance 0", which is lossless . Effort is how much time spent for compression . 9 is the best and very slow, 7 is default
It's not compatible with most browsers without plugins/extensions
Code:ffmpeg -h encoder=libjxl 1>libjxl.txt
Encoder libjxl [libjxl JPEG XL]:
General capabilities: threads
Threading capabilities: other
Supported pixel formats: rgb24 rgba rgb48le rgba64le gray ya8 gray16le ya16le grayf32le
libjxl AVOptions:
-effort <int> E..V....... Encoding effort (from 1 to 9) (default 7)
-distance <float> E..V....... Maximum Butteraugli distance (quality setting, lower = better, zero = lossless, default 1.0) (from -1 to 15) (default -1)
-modular <int> E..V....... Force modular mode (from 0 to 1) (default 0)
PNG has the highest compatibility , but webp is very compatible with modern browsers by default "out of the box"
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