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Date: Sat, 14 Feb 2015 11:36:48 +0100
From: Marc Joliet <marcec@gmx.de>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Package conflict while trying to emerge chromium
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Am Fri, 13 Feb 2015 18:11:31 -0500
schrieb "Walter Dnes" <waltdnes@waltdnes.org>:

> On Fri, Feb 13, 2015 at 08:02:08PM +0200, Gevisz wrote
> >=20
> > 2. I am not sure but my guess is that the gstreamer allows me to watch
> >    the video from youtube (partially), edX, cousera, etc. in a web-brow=
ser
> >    (I mainly use Firefox), as I never install any flash player to avoid
> >    too many "flashing" while browsing the Internet. (Would be interested
> >    to know if this my guess is correct.)

Yes, you are correct, at least for Firefox (but I would be surprised if it =
were
different for qtwebkit). Note that the dependencies aren't specified in the
ebuild itself, but in the mozconfig-* eclasses.  See for example the
mozconfig-v5.34 eclass:

	gstreamer? (
		>=3Dmedia-libs/gstreamer-1.2.3:1.0
		>=3Dmedia-libs/gst-plugins-base-1.2.3:1.0
		>=3Dmedia-libs/gst-plugins-good-1.2.3:1.0
		>=3Dmedia-plugins/gst-plugins-libav-1.1.0_pre20130128-r1:1.0
	)

The libav gstreamer plug-in is what lets you watch MP4 videos (and don't le=
t the
name fool you, it also works with ffmpeg). And if you install
gst-plugins-mad:1.0, then you can also play MP3s in Firefox (see
https://bugs.gentoo.org/show_bug.cgi?id=3D536530).

>   I use the Seamonkey variant of Firefox.  It has a more "classic" GUI
> interface, and a few other differences.  It also has an option in the
> settings...
>=20
> Edit =3D=3D> Preferences =3D=3D> Advanced =3D=3D> Scripts & Plugins
>=20
>   You can choose whether or not to "Activate all plugins by default".
> ***THIS IS NOT AN ADDON*** like Flashblock, so you don't have to worry
> about the author keeping up with the current version of the browser.  It
> is a built-in setting.  If you turn that option off, you get a box that
> says "Activate Adobe Flash" on any page with Flash on it.  You can click
> on the box, and that activates only the one instance.  If there are
> several flash boxes on a page, you can click on just the one(s) you
> want.

A variant of this setting also exists in Firefox, albeit it is accessed fro=
m the
about:addons page under Plugins.  There you get a per-plugin tri-state sett=
ing,
where you can choose between "always on", "always off", or "always ask".  W=
ith
the latter, you get the same behaviour you described: a placeholder that yo=
u can
click to selectively activate Flash.

Personally, I don't like that way of doing things, because unless you
completely deactivate Flash, Youtube will stupidly never attempt to use HTM=
L5
videos (I guess it sees that you have Flash installed?). Thus, I use the
FlashDisable extension, which simply makes it easier to toggle between "alw=
ays
on" and "always off" (although it won't allow you to selectively activate
Flash per instance on a page, which is too bad, although I rarely see this).

One thing I've joyfully noticed is how rare the instances where I need to
activate Flash are becoming :-) .

--=20
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup

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