$ ~ brew list
... gflags libpng ... 
$ ~/git/guetzli make
==== Building guetzli (release) ====
guetzli.cc
guetzli/guetzli.cc:24:10: fatal error: 'gflags/gflags.h' file not found
#include "gflags/gflags.h"
         ^
1 error generated.
make[1]: *** [obj/Release/guetzli.o] Error 1
make: *** [guetzli] Error 2 

Anyone gotten this to work?

I just got the latest guetzli release, and I have been trying to run it on my Ubuntu 17.04, I used the installation instructions from the README.md file, however, even after the successful build it keeps saying: guetzli: command not found Also there is no file created in bin/Release/ Please help.

Allows invocations like cat test.png | guetzli - - > test.jpg as requested in #104.

Retains optimization to preallocate buffer, if seeking is possible. Always uses in-memory buffer for libpng ensuring input file is only read once.

Installed dependency package libpng libpng-devel gflags gflags-devel.

yum install -y libpng libpng-devel gflags gflags-devel

make //The error is as follows

==== Building guetzli (release) ==== butteraugli_comparator.cc Package gflags was not found in the pkg-config search path. Perhaps you should add the directory containing `gflags.pc' to the PKG_CONFIG_PATH environment variable No package 'gflags' found cc1plus: error: unrecognized command line option "-std=c++11" make[1]: *** [obj/Release/butteraugli_comparator.o] Error 1 make: *** [guetzli] Error 2

Building from master (c78689c5e020c0cd3580783213798b6323eaa454) on macOS gives me the following error:

==== Building guetzli (release) ====
Creating obj/Release
butteraugli_comparator.cc
Package libgflags was not found in the pkg-config search path.
Perhaps you should add the directory containing `libgflags.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libgflags' found

...snip...

butteraugli.cc
Package libgflags was not found in the pkg-config search path.
Perhaps you should add the directory containing `libgflags.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libgflags' found
Linking guetzli
Package libgflags was not found in the pkg-config search path.
Perhaps you should add the directory containing `libgflags.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libgflags' found
Undefined symbols for architecture x86_64:
  "google::FlagRegisterer::FlagRegisterer<bool>(char const*, char const*, char const*, bool*, bool*)", referenced from:
      __GLOBAL__sub_I_guetzli.cc in guetzli.o
  "google::FlagRegisterer::FlagRegisterer<double>(char const*, char const*, char const*, double*, double*)", referenced from:
      __GLOBAL__sub_I_guetzli.cc in guetzli.o
  "google::SetUsageMessage(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from:
      _main in guetzli.o
  "google::ShowUsageWithFlags(char const*)", referenced from:
      _main in guetzli.o
  "google::ParseCommandLineFlags(int*, char***, bool)", referenced from:
      _main in guetzli.o
  "_png_create_info_struct", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_create_read_struct", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_destroy_read_struct", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_get_channels", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_get_image_height", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_get_image_width", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_get_rows", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_init_io", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_read_png", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
  "_png_set_longjmp_fn", referenced from:
      (anonymous namespace)::ReadPNG(__sFILE*, int*, int*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*) in guetzli.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [bin/Release/guetzli] Error 1
make: *** [guetzli] Error 2

As part of the Homebrew gflags package, the pkg-config file is gflags.pc, not libgflags.pc so the build process can't set up the build flags properly.

Hi,

I created the rpm package for CentOS7:

$ sudo yum install http://rpm.axivo.com/axivo-release-7-1.noarch.rpm
$ sudo yum --enablerepo=axivo install guetzli
$ yum -q info guetzli
Installed Packages
Name        : guetzli
Arch        : x86_64
Version     : 1.0
Release     : 1.el7
Size        : 473 k
Repo        : installed
From repo   : axivo
Summary     : Perceptual JPEG encoder
URL         : https://github.com/google/guetzli
License     : ASL 2.0
Description : Guetzli is a JPEG encoder that aims for excellent compression density at high
            : visual quality. Guetzli-generated images are typically 20-30% smaller than
            : images of equivalent quality generated by libjpeg. Guetzli generates only
            : sequential (nonprogressive) JPEGs due to faster decompression speeds they offer.

The man files are missing for guetzli and butteraugli, I was wondering if I missed something into make:

$ rpm -ql guetzli
/usr/bin/butteraugli
/usr/bin/guetzli
/usr/share/doc/guetzli-1.0
/usr/share/doc/guetzli-1.0/LICENSE
/usr/share/doc/guetzli-1.0/README.md

Regards,

Floren Munteanu

I'm using the Guetzli build with Homebrew. When compressing smaller images I'm getting a segmentation fault. The file in question is 419 bytes, and can be found at https://www.coastercms.org/themes/coaster/img/line.jpg.

Hi,

I just tried this tool and its great. As in, does the job. But when I showed it to a friend of mine, he compressed the same image using Microsoft paint and got a similar result.

So, I'm just wondering how this tool is different and better than the other tools available out there? Also, the time taken by Paint is much less than the time taken by Guetzli.

Is there anyone else who share a similar opinion?

Hey guys,

in my system (Ubuntu Ubuntu 16.04.2 LTS 4.4.0-66-generic), I've gotten "Undefined reference to pthread_rwlock_init" in my build.

In the file guetzli.make I've had to add -lpthread to LINKCMD variable. I don't if it was necessary in your build (maybe not), but I thought it would be interesting if you could add it in your source files.

Best regards,

Rodrigo Gonçalves de Branco

I want to use the Guetzli binary on my raspberry PI cluster; but there is no compiled release for the ARM architecture available. Do you guys think it's possible to build Guetzli on ARM?

Error:Execution failed for task ':app:merge Guanfang Debug Resources'. > Error: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException:

I could convert tons of image. But It suddenly stop working. It says

2021-08-14 01:46:37: Can't open input file 2021-08-14 01:46:37: guetzli_windows_x86-64.exe --verbose --quality 90 --nomemlimit 'C:**.jpg' 'C:**_guetzli.jpg' 2021-08-14 01:46:37: Finished with 1

How can I solve this? I need to use this program :(

The test corpus in the url is not there any more, thus the test cannot be run. https://github.com/google/guetzli/blob/214f2bb42abf5a577c079d00add5d6cc470620d3/tests/golden_test.sh#L14

Currently the Visual Studio Solution File (guetzli.sln) and the project files (guetzli.vcxproj and guetzli_static.vcxproj) are configured for Visual Studio 2015. It would be nice if those could be recompiled for Visual Studio 2019, which increases compatibility and performance.