Hi!

The following error was reported to me as I'm maintaining a tool that builds upon jpegrescan:

"I installed the program and its dependencies on Debian Wheezy. The Perl Slurp.PM installed by default into /usr/local/share/perl/5.14.2/Slurp.pm, however, line 5 of jpegrescan is "use File::Slurp;" resulting in the following error:

Can't locate File/Slurp.pm in @inc (@inc contains: /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl .) at /home/joe/bin/jpegrescan line 5.
BEGIN failed--compilation aborted at /home/joe/bin/jpegrescan line 5.

I was able to resolve the issue by creating /usr/local/share/perl/5.14.2/File and placing a soft link there pointing to /usr/local/share/perl/5.14.2/Slurp.pm. You may want to alter jpegrescan to accommodate this glitch."

Since I'm currently lacking the time to fork & patch this issue myself, I'm putting it up here for the sake of documentation and with the good intention of commiting a fix for it some day.

This project still works well, and has had some fixes since the last release. Other projects re-package it:
https://github.com/watilde/jpegrescan-bin

See: https://github.com/watilde/jpegrescan-bin/blob/master/lib/index.js

But as they rely on tags, they're not getting the benefit of those fixes.

I totally agree on #17 (comment):

i suspect jpegrescan is nearing obsolescence in the wake of mozjpeg which is under active development and compressing jpegs tiny percents more than jpegrescan already.

The deprecation notice is useful for developers who is looking for a really good image optimizer.

Public Domain Mark 1.0 is not an OSI-approved license, can you please use one from the list in here?
https://spdx.org/licenses/

When I run $ jpegrescan in.jpg out.jpg there is no out.jpg anywhere. The more interesting is that there is no error messages or notices, even when running the script with the -v flag.

Any suggestions?

I’m a little embarrassed that I have not figured this issue out, but I have looked at it so long that it has become a scenario of “not seeing the forest for all the trees”.

I have a customer that has around 48K+ images that are all within a recursive hierarchy. In order to make things work, I modified your script that you have created to allow for looping thru an array of paths to the images. The first always completes correctly, but the second fails every time. The following is the output that I am seeing.

/virtuals/tmp/media/pickadoll-logo.jpg --> /virtuals/tmp/media2/pickadoll-logo.jpg
...............
12238 --> 11728
-4.17%
/virtuals/tmp/media/images/about_us_main_1.jpg --> /virtuals/tmp/media2/images/about_us_main_1.jpg
................Invalid progressive parameters at scan script entry 5
Died at jpegOptimize.pl line 149.

I have attempted to modify the failing image individually and it is successful. I removed the first result you see in the example, thus making the one in the example that failed the first, and it was successful and the second again fails.

I am assuming that this is something related to variable not clearing from the previous optimization, but I am just not finding it.

Any assistance that can be offered would be sincerely appreciated.

It would be awesome if jpegrescan could read from stdin and print to stdout, so that it may be used in a pipeline.

Hi,

I am creating a package for jpegrescan. It would be nice if you could create a release tag. Then you can easily reference a specific tag.

Cheers

Some users reported that jpegrescan becomes I/O-bound (doesn't use 100% CPU, but generates hundreds of MB of disk I/O).

Currently it makes jpegtran write each intermediate/temporary result to disk. Maybe it could use pipes to store result in memory instead?

Running jpegrescan now gives the following warning message every time:

Name "main::restart" used only once: possible typo at ./jpegrescan line 132.
usage: jpegrescan in.jpg out.jpg

I don't know perl, but is that an unused variable warning?

If the file is PNG with the jpg extension, the output is a file of zero length without warning.

./jpegrescan in.jpg out.jpg
Not generating any out.jpg FYI : OS Amazon Linux.

By about 3 years

https://github.com/bsandrow/utils/blob/master/jpegrescan