Make JXL Files

[Sound Master]

After some debating, I finally decide to use regular jxl to store my images. How do I make the best visually lossless ones from extracting frames from my videos?

[pandy]

https://opensource.googleblog.com/2024/04/introducing-jpegli-new-jpeg-coding-library.html

life is a "beach"

[Sound Master]

https://opensource.googleblog.com/2024/04/introducing-jpegli-new-jpeg-coding-library.html

life is a "beach"

How do I use it?

[DB83]

Would it be too much for you to do some research rather than be spoon-fed by forum members ?

But do not expect free programs to use these new formats. More likely that commercial-paid programs get a licence and that comes down to what you pay for and, eventually, get.


And you fool noone. Already banned twice. Wanna make it a hattrick ?

[Sound Master]

Would it be too much for you to do some research rather than be spoon-fed by forum members ?

But do not expect free programs to use these new formats. More likely that commercial-paid programs get a licence and that comes down to what you pay for and, eventually, get.


And you fool noone. Already banned twice. Wanna make it a hattrick ?

Never mind, then.

[pandy]

How do I use it?

Same like other jpeg commandline encoders - not sure if ffmpeg will adopt jpegli in some predictable future - from my perspective it should but... this show that using even old technology but with new techniques you can deliver way higher quality.

[Sound Master]

Well, I usually use this to make jpg files:
-vf zscale=min=709:m=170m:rin=limited:r=full,format=(d epends on the video) -qmin 1 -qmax 1 -q:v 1 -output%d.jpg

Or, is there ways to make higher quality jpgs? By the way, I used rgb24 for the format and it still makes images.

[pandy]

Try this:

@setlocal

@set FFMPG=%CD%;E:\Media\FF
@set PATH=%FFMPG%;%PATH%

@set filename=%1

@set OUTDIR="aaa"
@if not exist %OUTDIR% (mkdir %OUTDIR%)

@ffmpeg -y -an -sn -dn -hide_banner -v 32 -stats -i %filename% -f:v zscale=min=709:m=170m:rin=limited:r=full,format=yuv444p -f image2 -c:v mjpeg -q:v 1 -qscale 1 -intra_matrix 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8 -huffman 1 "%OUTDIR%\%~n1_%%06d.jpg"

@set OUTDIR="bbb"
@if not exist %OUTDIR% (mkdir %OUTDIR%)

@ffmpeg -y -an -sn -dn -hide_banner -v 32 -stats -i %filename% -f:v zscale=min=709:m=170m:rin=limited:r=full,format=yuv444p -f image2 -c:v mjpeg -q:v 1 -qscale 1 -huffman 1 "%OUTDIR%\%~n1_%%06d.jpg"

@endlocal
@pause

Folder aaa has jpg with flat quantization matrix (8,8,8,8,8...,8), folder bbb default quantization matrix (my assumption default MPEG quantization matrix is used) - with using flat quantization matrix you are probably squeezing maximum from ffmpeg jpg quality.