GNU bug report logs - #52375
webkitgtk page crashes when missing gstreamer plugins
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Package: guix;
Reported by: Jack Hill <jackhill@HIDDEN>; dated Wed, 8 Dec 2021 17:17:02 UTC;
Maintainer for guix is
bug-guix@HIDDEN.
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Date: Tue, 21 Dec 2021 11:56:00 -0500
From: Leo Famulari <leo@HIDDEN>
To: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Subject: Re: bug#52375: webkitgtk page crashes on core-updates-frozen
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On Tue, Dec 21, 2021 at 11:39:05AM -0500, Maxim Cournoyer wrote:
> Another reason is that adding the gst-plugins-good and gst-plugins-bad
> would inflate the size of the webkitgtk package by more than 1 GiB!
> (compare "guix size webkitgtk" vs "guix size webkitgtk gst-plugins-good
> gst-plugins-bad").
If there is a particular plugin that is actually required for some
package, we could use the gst-plugins/selection procedure to add the
dependency while hopefully increasing the closure size by less than 1
GiB.
Information forwarded
to bug-guix@HIDDEN:
bug#52375; Package guix.
Full text available.
Changed bug title to 'webkitgtk page crashes when missing gstreamer plugins' from 'webkitgtk page crashes on core-updates-frozen'
Request was from Jack Hill <jackhill@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.
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From: Jack Hill <jackhill@HIDDEN>
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To: 52375 <at> debbugs.gnu.org
Subject: Re: bug#52375: webkitgtk needs gst-plugins-bad
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On Tue, 21 Dec 2021, Jack Hill wrote:
> I asked about this issue on #webkitgtk:gnome.org on IRC. It turns out that
> what's missing from my environment is gst-plugins-bad (most likely the
> fakevideosink plugin contained therein). If I install gst-plugins-bad into an
> environment with a webgkitgtk browser, the crash I was seeing is resolved.
> Only adding gst-plugins-bad to the inputs of webkitgtk doesn't seem to be
> enough to solve the problem. I suppose some additional wrapping is needed
> somewhere (although gst-plugins-base shows up in the webkitgtk references).
>
> What's the best path forward here?
I got permission to quote from the IRC conversation for some additional
context:
10:52 < jackhill> Hi folks! In the Guix WebKitGTK packages we seem to have introduced a problem that causes tabs to crash on some
pages. I'm trying to track it down, but could use a hand in either identifying the solution or in more
troubleshooting techniques: https://issues.guix.gnu.org/52375
10:55 < MichaelCatanzaro[m]> jackhill: Looks like you're missing a GStreamer element that is required (do you have:
gst-plugins-base, gst-plugins-good, and at least the free half of gst-plugins-bad?)
10:56 < MichaelCatanzaro[m]> Alternatively, maybe try deleting ~/.cache/gstreamer-1.0 in the off chance your registry is corrupt
10:58 < MichaelCatanzaro[m]> jackhill: I think you're missing the fakevideosink element from gst-plugins-bad
11:01 < jackhill> MichaelCatanzaro[m]: thanks. Looking at our package definition we only depend directlyon gst-plugins-base. It
seems that we were scared off of -bad at some point in the past:
https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/webkit.scm#n255
11:03 < jackhill> I'll look into adding them (and manybe clearing my cache). Were we wrong in our assesment of -bad?
11:06 < MichaelCatanzaro[m]> jackhill: Yup, that is mandatory... and disabling GStreamerGL is not recommended either
11:06 < jackhill> MichaelCatanzaro[m]: yep, adding -bad did it! Is there an official WebKitGTK statement that I can point to when
proposing my fix to Guix?
11:06 < MichaelCatanzaro[m]> Not all the elements are mandatory, but some are...
11:07 < MichaelCatanzaro[m]> jackhill: No, we just expect you to have a working gstreamer installation
11:07 < jackhill> hehe, fair enough
11:08 < MichaelCatanzaro[m]> Looks like there is a bug report: https://bugs.webkit.org/show_bug.cgi?id=233949
[daychange]
10:55 < jackhill> MichaelCatanzaro[m]: we're having a conversation in #guix:libera.chat about adding the gst-plugins-bad. Can I
quote our conversation yesterday to hopefully bring others up to speed?
11:26 < MichaelCatanzaro[m]> <jackhill> "Michael Catanzaro: we're..." <- Of course, all the history here is public anyway
11:27 < MichaelCatanzaro[m]> You need: gst-plugins-base, gst-plugins-good, and gst-plugins-bad (not gst-plugins-ugly)
11:27 < MichaelCatanzaro[m]> gst-libav especially welcome if available, but not required...
11:29 < MichaelCatanzaro[m]> GStreamer is indeed used inside the bwrap sandbox (most applications do not enable the sandbox, but
Ephy does)
11:29 < MichaelCatanzaro[m]> All web content is handled sandboxed :)
> Should leaf applications that use webkitgtk be wrapped to find the right
> gst-plugins? This seems suboptimal to me. If the plugins are really
> dependencies of webkitgtk then perhaps they should be encoded that way in
> Guix.
>
> Should webkitgtk be wrapped somehow to find the plugins on its own? How would
> this wrapping be done? Do we want to force all webkitgtk applications to
> carry around these dependencies?
We talked through some of these option on #guix:libera.chat (thanks
apteryx and cybersyn!) and it sounds like we're leaning towards the first
option. An additional concern with webkitgtk always pulling in the plugins
is that it increases the webkitgtk closure size by over 1G!
We're still waiting on webkitgtk builds to finish to help us determine if
we can enable GSTREAMER_GL.
Best,
Jack
Information forwarded
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bug#52375; Package guix.
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
To: Jack Hill <jackhill@HIDDEN>
Subject: Re: bug#52375: webkitgtk page crashes on core-updates-frozen
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Date: Tue, 21 Dec 2021 11:39:05 -0500
In-Reply-To: <alpine.DEB.2.21.2112202258320.9433@HIDDEN> (Jack Hill's
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Hello Jack,
Jack Hill <jackhill@HIDDEN> writes:
> I asked about this issue on #webkitgtk:gnome.org on IRC. It turns out
> that what's missing from my environment is gst-plugins-bad (most
> likely the fakevideosink plugin contained therein). If I install
> gst-plugins-bad into an environment with a webgkitgtk browser, the
> crash I was seeing is resolved. Only adding gst-plugins-bad to the
> inputs of webkitgtk doesn't seem to be enough to solve the problem. I
> suppose some additional wrapping is needed somewhere (although
> gst-plugins-base shows up in the webkitgtk references).
>
> What's the best path forward here?
>
> Should leaf applications that use webkitgtk be wrapped to find the
> right gst-plugins? This seems suboptimal to me. If the plugins are
> really dependencies of webkitgtk then perhaps they should be encoded
> that way in Guix.
I think upstream should improve their software to display more
informative messages when a plugin is missing to play some content (a
tab crash is not very helpful!) :-).
> Should webkitgtk be wrapped somehow to find the plugins on its own?
> How would this wrapping be done? Do we want to force all webkitgtk
> applications to carry around these dependencies?
I think there's not much to do here other than document the availability
of plugins to extend the capabilities of webkitgtk. It's won't be
obvious to leaf package users though, so fixing it upstream would still
have value.
As discussed on #guix, some reasons for not propagating them or even
wrapping them is the fact that they are *plugins*, that is, they exist
in that form so that users can compose them for runtime discovery as
they see fit. Propagating the plugins would go against this, and is not
very "Guixy" :-).
Another reason is that adding the gst-plugins-good and gst-plugins-bad
would inflate the size of the webkitgtk package by more than 1 GiB!
(compare "guix size webkitgtk" vs "guix size webkitgtk gst-plugins-good
gst-plugins-bad").
I'm tempted to make this change to the description of 'webkitgtk':
--8<---------------cut here---------------start------------->8---
modified gnu/packages/webkit.scm
@@ -350,7 +350,9 @@ (define-public webkitgtk
(description
"WebKitGTK+ is a full-featured port of the WebKit rendering engine,
suitable for projects requiring any kind of web integration, from hybrid
-HTML/CSS applications to full-fledged web browsers.")
+HTML/CSS applications to full-fledged web browsers. WebKitGTK+ can play
+various video content through the use of the GStreamer plugins (not propagated
+by default) such as @code{gst-plugins-good} and @code{gst-plugins-bad}.")
;; WebKit's JavaScriptCore and WebCore components are available under
;; the GNU LGPL, while the rest is available under a BSD-style license.
(license (list license:lgpl2.0
--8<---------------cut here---------------end--------------->8---
and close this as 'notabug'. What do you think?
Thanks,
Maxim
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From: Jack Hill <jackhill@HIDDEN>
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To: 52375 <at> debbugs.gnu.org
Subject: Re: bug#52375: webkitgtk needs gst-plugins-bad
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I asked about this issue on #webkitgtk:gnome.org on IRC. It turns
out that what's missing from my environment is gst-plugins-bad (most
likely the fakevideosink plugin contained therein). If I install
gst-plugins-bad into an environment with a webgkitgtk browser, the crash I
was seeing is resolved. Only adding gst-plugins-bad to the inputs of
webkitgtk doesn't seem to be enough to solve the problem. I suppose some
additional wrapping is needed somewhere (although gst-plugins-base shows
up in the webkitgtk references).
What's the best path forward here?
Should leaf applications that use webkitgtk be wrapped to find the right
gst-plugins? This seems suboptimal to me. If the plugins are really
dependencies of webkitgtk then perhaps they should be encoded that way in
Guix.
Should webkitgtk be wrapped somehow to find the plugins on its own? How
would this wrapping be done? Do we want to force all webkitgtk applications
to carry around these dependencies?
Best,
Jack
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Subject: Re: bug#52375: Both pages load fine for me
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I've attached the output of running `LD_DEBUG=all epiphany` and then
demonstrating the problem. Unfortunately, I wasn't able to determine what
part would be relevant, so I've attached the whole thing which is 1.3G
uncompressed.
Best,
Jack
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