Package Details: opencv2 2.4.13.7-7

Git Clone URL: https://aur.archlinux.org/opencv2.git (read-only, click to copy)
Package Base: opencv2
Description: Open Source Computer Vision Library (version 2.x)
Upstream URL: https://opencv.org/
Licenses: BSD-3-Clause
Submitter: reisub
Maintainer: dbermond
Last Packager: dbermond
Votes: 31
Popularity: 0.046994
First Submitted: 2016-04-25 13:35 (UTC)
Last Updated: 2025-04-04 11:04 (UTC)

Latest Comments

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loveb commented on 2025-09-24 09:27 (UTC)

@dbermond Sorry, I didn’t know that. Thanks for letting me know :p

dbermond commented on 2025-09-23 20:47 (UTC)

@loveb this is not needed, and in fact is not desirable, as it would break the users configuration. When using the cmake generator 'Unix Makefiles', like we use in this package, the building parallelism level is controlled the in '/etc/makepkg.conf' by the 'MAKEFILES' environment variable. Please see the ArchWiki makepkg article about parallel compilation. Each user is free to configure their own parallel compilation settings, instead of rely in an sub-optimal number forcefully imposed by a PKGBUILD.

loveb commented on 2025-09-23 20:08 (UTC)

It would be nice if you could change the line "cmake --build build" to "cmake --build build --parallel"

dbermond commented on 2023-12-02 16:45 (UTC)

@MarsSeed After further investigation, the only relevant option in this subject is 'WITH_LIBV4L'. Option 'WITH_V4L' uses only internal code without linking to v4l libraries and can be enabled (or suppressed). Package updated (again).

dbermond commented on 2023-12-02 16:07 (UTC)

@MarsSeed Implemented, although I think this is not strictly needed in this case as v4l will not hurt anyone, and reproducible environment is user responsibility when it matters, but it can help to reduce memory footprint of some users.

MarsSeed commented on 2023-12-02 12:20 (UTC) (edited on 2023-12-02 12:23 (UTC) by MarsSeed)

Thank you for fixing and enhancing this.

One observation: v4l-utils gets automatically linked to when available. I've built this in an environment together with ffmpeg, which pulled in v4l-utils. (I know ffmpeg itself is not needed for this. But life happens, so people don't always build in a totally clean environment.)

I'd like to suggest that you either declare v4l-utils in depends, or disable linking to it in cmake's configuration (WITH_V4L='OFF' and WITH_LIBV4L='OFF'). Just to ensure a more robust and reproducible build.

Thank you in advance for considering this suggestion.

MarsSeed commented on 2023-11-12 04:18 (UTC)

And python2-numpy is also not really needed and not mandatory, I believe.

MarsSeed commented on 2023-08-03 19:54 (UTC) (edited on 2023-11-12 03:36 (UTC) by MarsSeed)

Based on AUR/opencv2 PKGBUILD, I've found out that eigen2 is not mandatory: this can be built without it. (The latter AUR package is broken.)

bsutherland333 commented on 2022-12-31 01:46 (UTC)

I found that this package will not compile with the latest versions of tbb and ffmpeg, but if you replace those with tbb2020 and ffmpeg4.4 it will.

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