convert webp to jpg error: "no decode delegate for this image format" and "missing an image filename"

Question

I'm using ubuntu 12.04. I've installed libwebp2 & libwebp-dev

So far, no example found on the net of converting webp to jpg.

Some webp files can easily converted by using imagemagick with command

convert file.webp file.jpg

but lots of webp files cannot be converted and give error:

convert: no decode delegate for this image format `file.webp' @ error/constitute.c/ReadImage/532.
convert: missing an image filename `file.jpg' @ error/convert.c/ConvertImageCommand/3011.

--------added

This is the file: http://www.filedropper.com/file_144

Could you post some of the files that cannot be converted so we can have a go? — terdon, Mar 30 '13 at 17:39
Strange that IM would convert some webp files and not others. Can the ones that fail be viewed in a browser or image editor (perhaps they are corrupt)? How did you install IM? AFAIK, it needs to be specifically compiled with webp support after installing libwebp[-devel]. — dartonw, Mar 30 '13 at 18:45
Just upload the file to Dropbox or something similar. Since I don't have any .webp files, I have no way of testing. — terdon, Mar 30 '13 at 18:46
@terdon, you can find some samples at https://developers.google.com/speed/webp/gallery1. — dartonw, Mar 30 '13 at 18:59

score 148 · Accepted Answer · edited Oct 30 '18 at 12:20

148

Google already provided the tool to decode webp images in the libwebp package, your uploaded file works on Arch.

dwebp file.webp -o abc.png

For the encoding tool, check the cwebp command.

In Ubuntu you can install the tools with:

sudo apt install webp

On RHEL/CentOS:

 yum install libwebp libwebp-tools

And you might consider using this online tool.

edited Oct 30 '18 at 12:20

Anthony Geoghegan

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answered Mar 31 '13 at 09:58

daisy

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Unfortunately dwebp only converts webp to png, but not to jpg. – rumpel Oct 29 '13 at 08:30
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@rumpel thx, it failed to open the .jpg, but when I put .png it worked! – Aquarius Power Dec 08 '14 at 03:49
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In 14.04 I needed to install the package `webp` it was not available until I installed that. I was confused because I had install all the `libwebp` and `libweb-dev` packages. – TryTryAgain May 05 '15 at 17:29
works on fedora/EL, just install libwebp-tools – Michel Samia Mar 24 '16 at 13:08
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Use `dwebp` for webp->png, and then `convert` for png->jpg. Using pipe. `dwebp 1.webp -o - | convert - 1.jpg` – steve Jul 15 '16 at 17:57
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For windows use the following command for %f in (*.webp) do dwebp.exe "%f" -o "%~nf.png" – Matija Grcic Nov 18 '16 at 18:21
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In 2018, dwebp converted to jpg for me. Thanks! – dannyman Apr 11 '18 at 23:52
On CentOS `dwebp` command was only available after: `yum install libwebp.x86_64` AND `yum install libwebp-tools.x86_64` – adrianTNT Oct 30 '18 at 11:54
The dwebp doc says nothing about JPG as target format: https://developers.google.com/speed/webp/docs/dwebp – Bernhard Döbler Feb 15 '19 at 23:26
@steve Just the command I was looking for, can you please convert your [comment](https://unix.stackexchange.com/questions/70622/convert-webp-to-jpg-error-no-decode-delegate-for-this-image-format-and-missi#comment519949_70673) to an answer ? – SebMa Sep 01 '20 at 22:29
@SebMa - sure, done – steve Sep 02 '20 at 21:37

xrisk · Answer 2 · 2019-05-18T03:32:38.863

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ffmpeg can do this. Useful if you already have ffmpeg. No need for installing other tools.

Simply:

ffmpeg -i file.webp out.png

edited May 18 '19 at 03:32

answered Mar 04 '17 at 12:40

xrisk

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It works, but the png is 11x larger. – RonJohn Jul 26 '19 at 14:30
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it works. It is good for `jpg` image, but `png` format is `very large`. – mahfuz Nov 10 '19 at 08:46
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This worked for me, using dwebp produced broken jpegs on the images I did. – Jonno_FTW Nov 27 '19 at 00:58

score 28 · Answer 3 · edited Jan 21 '15 at 03:05

28

Convert all webp files within a directory

find ./ -name "*.webp" -exec dwebp {} -o {}.png \;

Note: dwebp is in the libwebp package

edited Jan 21 '15 at 03:05

HalosGhost

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answered Jan 21 '15 at 02:54

Jeff McHale

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For Ubuntu 16.04 I needed to install it with `sudo apt-get install webp`. – PhoneixS Aug 18 '17 at 17:58
Dont know if ment as a feature or a bug, but all the files will be saved as `file.webpg.png` instead of simply `file.png` – mrfr Jul 09 '19 at 20:35
It's a feature for simplicity... I have a image hashing algorithm which automatically renames images, so I intended to rename the files using that. – Jeff McHale Jul 11 '19 at 01:00
Using ffmpeg: `find ./ -name "*.webp" -exec ffmpeg -i {} {}.jpeg \;` – Kyle Chadha Feb 13 '21 at 19:39

score 11 · Answer 4 · edited Oct 02 '20 at 00:24

11

From the directory containing the webp files:

for x in *.webp; do ffmpeg -i "$x" "${x%.webp}.jpg"; done

edited Oct 02 '20 at 00:24

Kev

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answered Jun 21 '17 at 22:15

Byram Sewell

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Add `-loglevel quiet` as ffmpeg option to suppress the copious log output. – Sri Apr 28 '21 at 05:35
This brought the image quality significantly down. – Steve Moretz Aug 16 '21 at 11:28

score 3 · Answer 5 · answered Sep 02 '20 at 21:36

3

Use dwebp for webp->png, and then convert for png->jpg. Using pipe.

dwebp 1.webp -o - | convert - 1.jpg

answered Sep 02 '20 at 21:36

steve

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score 1 · Answer 6 · answered Mar 31 '13 at 10:40

There is another online tool available here which can help you on this:

http://image.online-convert.com/convert-to-jpg

but if you want a local tool, you can use this one:

https://code.google.com/p/webp/downloads/detail?name=webpconv&can=2&q=

and use it like this:

1) chmod a+x webpconv

2) ./webpconv -format PNG <YOUR_WEBP_FILE>.webp

The overall structure is like this:

webpconv [-output_dir dir] [-format format] [-quality quality] input_file(s)

Example) To convert a .png image to WebP with a quality of 90 you would enter:

webpconv -quality 90 /home/user/image_name.png

and to convert a WebP file to a PNG one:

webpconv -format PNG /home/user/image_name.webp

score 0 · Answer 7 · answered Jul 15 '16 at 17:34

To convert multiple jpg to webp, using cwebp:

find ./ -name "*.jpg" -exec cwebp -q 70 {} -o {}.webp \

Thunar Custom Action:

for file in %F; do cwebp "$file" -o "${file%%.*}".webp; done

Thunar Custom Action, moving webp images to subfolder:

mkdir %d/webp && cd %d; for file in %N; do cwebp "$file" -o "webp/${file%%.*}".webp; done

Cwebp's default quality setting is 75.

score 0 · Answer 8 · answered Jan 23 '18 at 12:01

0

install the webp package with sudo apt install webp, after that it should work.

answered Jan 23 '18 at 12:01

törzsmókus

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why the downvote? this exact solution got incorporated into the accepted answer _after_ I gave mine – törzsmókus Oct 28 '20 at 11:29

score 0 · Answer 9 · answered Oct 25 '18 at 13:23

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for x in ls *.webp; do ffmpeg -i $x ${x%.webp}.jpg; done which is solution stolen from Byram Sewell and Jeff Bowman https://stackoverflow.com/a/17844019/146745

answered Oct 25 '18 at 13:23

andrej

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score -1 · Answer 10 · edited Jun 10 '14 at 03:33

-1

I found this method faster for my 1 time need.

Take screenshot with webp image open in chrome.
Paste into paint program.
Crop and save.

edited Jun 10 '14 at 03:33

Ramesh

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answered Jun 10 '14 at 03:11

PRS

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The questioner was looking for a command line solution... – jasonwryan Jun 10 '14 at 04:06
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I think it could be made as a command line by using Shutter and taking a screenshot of a window without window decorations, all in a script; could be fun to code :) – Aquarius Power Aug 11 '14 at 22:30
Screenshots loose much of the original quality, therefore, they voted "-1" to your answer. It is not a good solution. – Estatistics Jan 03 '22 at 08:17

convert webp to jpg error: "no decode delegate for this image format" and "missing an image filename"

10 Answers10