Date: Tue, 02 Sep 2008 11:59:12 -0400 From: FreeBSD <freebsd@optiksecurite.com> To: Polytropon <freebsd@edvax.de> Cc: Tom Marchand <m0rchand@comcast.net>, Andrew Gould <andrewlylegould@gmail.com>, freebsd-questions@freebsd.org Subject: Re: How to compare 2 images from command line Message-ID: <48BD62D0.4030809@optiksecurite.com> In-Reply-To: <20080902174044.520fbbb3.freebsd@edvax.de> References: <090220081512.17537.48BD57E100051D800000448122068246930B020E080C9DCF03@comcast.net> <48BD5A8A.5080400@optiksecurite.com> <d356c5630809020828y1e4bf347k7725857a4ceaa761@mail.gmail.com> <48BD5C65.9030502@optiksecurite.com> <20080902174044.520fbbb3.freebsd@edvax.de>
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Polytropon a écrit : > On Tue, 02 Sep 2008 11:31:49 -0400, FreeBSD <freebsd@optiksecurite.com> wrote: >> I want to determine if Mplayer is working correctly. The best way to be >> sure is to check if the display on the screen is changing. That's the >> purpose of the screenshots. > > And this works? I always thought mplayer would output the video > stream via DRI / DRM, so on the screenshot, nothing would be seen... > Yes it works. I don't know how scrot takes it's screenshot but it does it well ;) >> The screenshots are taken by Nagios every 5 >> minutes and the new screenshot is compared with the preceding one. But, >> by now, it doesn't work because every tool we try is seeing a diffence >> between 2 identical images. > > The images may be identical in content, but it's completely possible > that other data (others than the pictural information) is coded into > the file, for example date and time of creation, so the files may be > different, while the pictures they show are identical. > > It would be useful first to "decompile" the files - create a new file > that only contains pictural information, nothing more. > > >
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