Am Fri, 13 Feb 2015 18:11:31 -0500 schrieb "Walter Dnes" <waltd...@waltdnes.org>:
> On Fri, Feb 13, 2015 at 08:02:08PM +0200, Gevisz wrote
> >
> > 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-browser
> > (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? (
>=media-libs/gstreamer-1.2.3:1.0
>=media-libs/gst-plugins-base-1.2.3:1.0
>=media-libs/gst-plugins-good-1.2.3:1.0
>=media-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 let 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=536530).
> 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...
>
> Edit ==> Preferences ==> Advanced ==> Scripts & Plugins
>
> 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 from the
about:addons page under Plugins. There you get a per-plugin tri-state setting,
where you can choose between "always on", "always off", or "always ask". With
the latter, you get the same behaviour you described: a placeholder that you 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 HTML5
videos (I guess it sees that you have Flash installed?). Thus, I use the
FlashDisable extension, which simply makes it easier to toggle between "always
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 :-) .
--
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup
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