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Bug 100872 - Gstreamer Plugins and Use Flags
Summary: Gstreamer Plugins and Use Flags
Status: RESOLVED INVALID
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: New packages (show other bugs)
Hardware: All Linux
: High normal
Assignee: GStreamer package maintainers
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2005-07-31 02:56 UTC by Fabian Zeindl
Modified: 2006-04-12 09:05 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Fabian Zeindl 2005-07-31 02:56:46 UTC
There are many packages whose Use flags affects which gstreamer plugins get
installed. A few I can think of are:

media-sound/amarok
media-video/totem
gnome-base/nautilus
media-sound/sound-juicer
...

Since when one package installs a specific Gstreamer plugin *every* other
package can use it, it doesn't make any sense if I'd totem without flac-Useflag
and nautilus with flac-Useflag.
Wouldn't it be better if gstreamer itself provided this useflags and not every
package? Or a gstreamer-plugins metapackage which does that?

Reproducible: Always
Steps to Reproduce:
Comment 1 Carsten Lohrke (RETIRED) gentoo-dev 2005-07-31 06:00:29 UTC
> Wouldn't it be better if gstreamer itself provided this useflags and not every
package? Or a gstreamer-plugins metapackage which does that?

Absolutely. Just the gstreamer herd doesn't agree...
Comment 2 foser (RETIRED) gentoo-dev 2005-07-31 06:51:07 UTC
everybody knowledgable disagrees.

this was discussed before, just search for the bug.
Comment 3 Fabian Zeindl 2005-07-31 07:11:42 UTC
I did search Bugzilla, but didn't found a bug covering this. Do you have the No.?
Comment 4 Carsten Lohrke (RETIRED) gentoo-dev 2005-07-31 08:29:09 UTC
> everybody knowledgable disagrees.

foser, you're just plain wrong in this case. The plugins are not bound to the
applications which can use them, but to gstreamer. This means when two
applications optional depend on e.g. the flac plugin and you enable the use flag
for the one, but disable it for the other application, both will use the flac
plugin nevertheless you disbled the use flag for the one application. The
current way to push the dependencies into the applications which use gstreamer
is simply braindead.
Comment 5 Fabian Zeindl 2005-07-31 23:51:02 UTC
So is this fixed?
I don't think that the current solution makes any sense...
Comment 6 foser (RETIRED) gentoo-dev 2005-08-01 02:56:49 UTC
I closed this because this is a dupe, not because you aren't entitled to your
opinion. And no, I'm not inclined to do the searching for you today.
Comment 7 Fabian Zeindl 2005-08-01 03:56:40 UTC
I searched Bugzilla for an hour now and didn't find anything.
You say it's a duplicate and don't provide the Bug Nr, but mark it CLOSED.
But from what Carsten Lohrke above says there are apparently people who don't
think that this bug's closed. I don't think it's closed either, cause I can't
find the other bug covering this.
So *please* give me at least hints where I have to look for that.
Comment 8 foser (RETIRED) gentoo-dev 2005-08-01 04:15:38 UTC
You got opinions and decisions, there are always issues where people will not
come to an agreement, that is no reason to keep discussing it forever if nothing
in the situation has changed. Carlo and the KDE team in general seem to hold
another view than the gnome and gstreamer team in this matter, so be it. I have
a few gripes with how KDE handles things in some of their respective areas as
well, I just don't try to rekindle pointless discussion about them every
opportunity I get.

Bug #84663 discusses the choices made in detail.
Comment 9 Fabian Zeindl 2005-08-03 01:44:47 UTC
Thanks for you answer.

I certainly don't want to waste your time, but I've added a comment to the other
bug.
Comment 10 Fabian Zeindl 2005-08-04 03:56:40 UTC
I post it here too: I don't want to waste developer's time, but I've read trough
this discussion and I still don't understand why gstreamer plugins use flags
aren't in gst-plugins.

The reason foser mentioned is that when you build amarok you can decide what
formats to support. But when you merge amarok as your only gstreamer application
you get gstreamer and gst-plugins too, so you actually can decide which plugins
to support. And when you want to get flac support you add 'flac' to your use
flags, and emerge -uDN world will reemerge gstreamer and not amarok.

So for use flags in gst-plugins: (in the assumption that gstreamer plugins are
installed via portage, and not that application install additional plugins)

PROs:
 * you have ONE place where you can decide what gstreamer plugins to install
 * you don't have 'wasted useflags'. It's not logical if I compile amarok
without flac and still can use flac...
 * you don't have to reemerge EVERY single application that has gstreamer
useflags, when you want to install ONE additional gstreamerplugin, that's
completely UNNECESSARY
 * people don't get confused when using xine and useflags doesn't have an
impact. (mp3 doesn't work -> recompile amarok with xine and mad -> mp3 still
doesn't work)
 
CONS:
 * you have to understand that you use gstreamer: when you want to have
additional capabilities simple recompiling of amarok (p.e.) doesn't work, you
have to recompile gstreamer or emerge -uDN world

For me the PROS outweigh the CONS. What do you say?
Comment 11 Brian Harring (RETIRED) gentoo-dev 2005-08-16 05:40:42 UTC
Wow... nice comments there foser :P
Sounds more like use deps are the issue here, even if people ever agreed on an
appropriate design...
Comment 12 Gregorio Guidi (RETIRED) gentoo-dev 2005-08-23 02:07:15 UTC
I don't think use deps are a central point in the proposed design, apps like 
amarok would just depend on gstreamer and gst-plugins with no additional 
flags. 
 
And for what is worth, my opinion is that the PROs do outweight the CONs here. 
Comment 13 Brian Harring (RETIRED) gentoo-dev 2005-08-23 02:27:08 UTC
Note the Cons.

 * you have to understand that you use gstreamer: when you want to have
additional capabilities simple recompiling of amarok (p.e.) doesn't work, you
have to recompile gstreamer or emerge -uDN world

If amarok requires gstreamer configured a certain way, that's a use dep- iow
merging amarok requires gstreamer to be rebuilt (if needed) with the use
configuration it requires.

So... either you strictly force gstreamer to carry all the use flags (not
representing say amarok's flac conditional), or you enforce that gstream has
flac flipped on, which pulls in the dep via that package.

Dropping conditionals from (say) amarok and strictly forcing them on gstreamer
doesn't strike me as correct for the con stated; to do it proper requires
pushing the conditional down to gstreamer, which isn't possible yet.
/me shrugs, eenie meenie 'spose.
Comment 14 Fabian Zeindl 2005-08-23 03:08:33 UTC
> If amarok requires gstreamer configured a certain way, that's a use dep- iow
> merging amarok requires gstreamer to be rebuilt (if needed) with the use
> configuration it requires.

Why should this happen?
I'm sure there are other packages in portage which change their behaviour when
use flags in one of their dependencies are set.
Comment 15 Carsten Lohrke (RETIRED) gentoo-dev 2005-08-23 05:41:29 UTC
(In reply to comment #13)
> Dropping conditionals from (say) amarok and strictly forcing them on gstreamer
> doesn't strike me as correct for the con stated;

The point is that as soon as a plugin is available to one application it's
available to all - despite of having the corresponding use flagged dependency
set or not. That's a) illogical and b) when users uninstall a plugin they did
not depend on for one application, but are used to it in between because it was
invoked by another ebuild, you run into exactly the same problem (and possible
"bug" reports): Users who don't know how their applications with gstreamer work. 

(In reply to comment #14)
> I'm sure there are other packages in portage which change their behaviour when
> use flags in one of their dependencies are set.

Just because you did not noticed more problems with second level dependencies,
plugins and the like, doesn't mean they do not exist.

Comment 16 Joshua Baergen (RETIRED) gentoo-dev 2005-08-29 08:04:09 UTC
Personally I'd much rather have users confused about a correct control system
than them confused about an incorrect one.

In any case, applications that depend on xine-lib as a back-end can play
whatever xine-lib supports.  xine-lib has many USE-flags that control what it
supports, which affects everything using it.  mplayer-based apps (though fewer
afaik) operate the same way.  Making gstreamer behave the same way only seems to
make sense and promote consistency.
Comment 17 Fabian Zeindl 2005-08-31 06:15:58 UTC
So can someone of the gstreamer herd say something to this. Again: I see no
reason why gstreamer should be treated differently from xine-lib. It's
unlogical, confusing and it annoys users.

Just a simple "OK, we will implement the changes" or a "No, your suggestions
suck because of X, Y, Z". (all reasons given above have been confuted).

greetings
fabian
Comment 18 Fabian Zeindl 2005-10-14 10:41:08 UTC
Just another idea: Create a gst-plugins meta-package with use flags for all
packages.

Another incosistency: If the use flags stay in the applications ebuilds every
ebuild has to accept every gst- useflag (vorbis, aac, dts, ogg, ...)... This is
not the case at the moment.
Comment 19 foser (RETIRED) gentoo-dev 2006-04-12 09:05:50 UTC
endless nameless