why can't img2webp read a folder of PNGs?

[bach99]

What arguments do I use if I have a folder of PNGs and want to convert them to webp? Thanks. 

[James Zern]

Hi,

On Thursday, October 25, 2018 at 10:06:08 AM UTC-7, bach99 wrote:

What arguments do I use if I have a folder of PNGs and want to convert them to webp? Thanks. 

The bug linked in another thread [1] contains a shell option which should work. You can use a batch or shell script depending on your environment. Given this has come up a few times over the years maybe we could add a FAQ entry and something to our README.

[1] https://groups.google.com/a/webmproject.org/d/msg/webp-discuss/pakZCY0J6Qw/eJX51r2GaMMJ 

[James Zern]

On Thursday, October 25, 2018 at 10:32:26 AM UTC-7, James Zern wrote:

Hi,

On Thursday, October 25, 2018 at 10:06:08 AM UTC-7, bach99 wrote:

What arguments do I use if I have a folder of PNGs and want to convert them to webp? Thanks. 

The bug linked in another thread [1] contains a shell option which should work. You can use a batch or shell script depending on your environment. Given this has come up a few times over the years maybe we could add a FAQ entry and something to our README.

I updated the FAQ for cwebp [2], the img2webp documentation [3] will be updated with the next release.

 

[1] https://groups.google.com/a/webmproject.org/d/msg/webp-discuss/pakZCY0J6Qw/eJX51r2GaMMJ 

[2] https://developers.google.com/speed/webp/faq#how_can_i_convert_my_personal_images_files_to_webp

[3] https://chromium-review.googlesource.com/c/webm/libwebp/+/1301213 

[feni...@gmail.com]

Could you provide the example of use all *.png from folder by img2webp.exe (on windows), please?

[James Zern]

Hi,

On Thu, Apr 30, 2020 at 2:21 PM <feni...@gmail.com> wrote:
>
> Could you provide the example of use all *.png from folder by img2webp.exe (on windows), please?
>

One option would be to list all the files in a text file. img2webp
will read commands from a file if it's the only argument given on the
command line. Something like this should work:
dir /b *.png >args.txt & echo -o output.webp >> args.txt & img2webp.exe args.txt

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