Need a scripting wiz for a Parallel WEBP conversion command problem?

[handy]

Hi there. :)
Since webp came out I've been using a clumsy method to convert the files to png format, one at a time. I always have to manually rename them. I do all this inside of the Worker filemanager where I have a button setup with the following command:

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dwebp {f} -o output.png

This method takes the <filename>.webp data & makes a copy of the image in png format, but named output.png . Which I obviously have to manually rename from "output" to the original or other desired filename.

Now I found some info on the web, & the following command line, which uses the Parallel software package (for speed), & gives me the output <NO name>.png

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parallel dwebp {} -o {.}.png ::: *.webp

Could someone please correct the above command string so that it also transfers the original name of the file to the new png file?
That would be SO helpful. :)

Also, I have this string which is supposed to do the content of nested sub-directories, though I think it is likely not correct either:

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find . -name "*.jpg" -print0 | parallel -0 dwebp {} -o {.}.png

Thanks for looking.

[CharlesV]

The simplest method I know of if al files are in one folder, is to run this in that folder.

mogrify -format png *.webp

[handy]

The simplest method I know of if al files are in one folder, is to run this in that folder.

mogrify -format png *.webp

Thank you Charles V - Holy Roman Emperor, King of Spain and Duke of Burgundy. No wonder you gained such titles, you are obviously a man of great practical knowledge & diplomacy.

Which is my long way of saying much appreciated. your method works really well, & it was really fast doing multiple files in a directory after I put the string into button on Worker. :D

I won't mark the thread solved just yet though, as I really would like to see how the command lines look when they are made to work properly.

[handy]

I just had a look at the mogrify man page. It is really something else. I was unaware of its existence prior to your post CV.

[CharlesV]

lol... very glad you like it - it is rather quite the interesting command!

[i_ri]

hello handy and CharlesV and everyone
because you are rather a console purist, you may get a grin from this. Using CharlesV' command: (thanks CharlesV)

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yad --text=" drop image \n create png " --dnd|sed 's/^......./mogrify\ -format png\ /e'

The manual indicates that convert creates a new, second image or mogrify changes a file in-place; the drop box creates a new, second png:image with mogrify; what do you think of that output png outcome?
drop an image format file.

[i_ri]

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ls *.webp | parallel mogrify -format png {} {.}.png

from example page Using CharlesV' command (?)
https://www.gnu.org/software/parallel/p ... mples.html

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ls *.webp | parallel dwebp -quiet -mt {} -o {.}.png

[DukeComposed]

Now I found some info on the web, & the following command line, which uses the Parallel software package (for speed)

Custom parallelization tools may not be necessary. xargs supports a -P argument, which allows multiple concurrent processes. From "man xargs":

Some commands can usefully be executed in parallel too; see the -P option.

[snip]

-P max-procs, --max-procs=max-procs
Run up to max-procs processes at a time; the default is 1. If max-procs is 0,
xargs will run as many processes as possible at a time. Use the -n option or the
-L option with -P; otherwise chances are that only one exec will be done.

You could pipe the output of find to xargs -P and it should produce a similar workflow right out of the box.

[handy]

Ah! Now I know what a slow old bastard like me needs to try & get my brain's cpu speed up -- max-procs max procs max procs! :D

My thanks to you all, I'll check out all of this very interesting input & see what wonders manifest.

It really is amazing how many ways to skin that poor cat there are. People just keep on finding different ways... It really does seem to be one of humanities core strengths.

[i_ri]

do be careful with the commands that will overwrite a png file; keep existing png images out of harms way ..