GStreamer Problem related to pkgconfig files?

[KANIYONIKA]

I was developing an app using GStreamer and ran into this issue.

https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1159

I checked the contents of this issue and found that the issue needs to be resolved on the homebrew side.

yes. I guess we should've blocked 1.20.1 on -Wl,-rpath, being added to the pkgconfig files. We should do it now, before 1.20.2 (as a blocker).

I am not sure how to go about getting this issue resolved.
I apologize if I am rude. Please advise me.

[carlocab]

It seems like backporting the patch referenced in the issue might help: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/97655eb8ac70b6de0b672e8df73ece5c901371d3

Try to see if rebuilding gstreamer with that patch helps. If it does we can apply it to the formula and fix it for everyone else using it.

[carlocab]

Oh, that's great news. Thanks for the info. I take it this means meson ... && ninja ... from a Git tag should just Do The Right Thing then?

Additionally, from the formulae that use gstreamer:

❯ brew uses --eval-all --include-build --include-test --recursive gstreamer
aravis                        gst-devtools                  gst-plugins-base              gst-python                    pympress
clutter-gst                   gst-editing-services          gst-plugins-good              gst-rtsp-server               spice-gtk
efl                           gst-libav                     gst-plugins-rs                libnice                       virt-manager
gradio                        gst-plugins-bad               gst-plugins-ugly              pdfpc                         webkitgtk

I take it only the ones that are prefixed with gst- are the plugins that will be replaced by a monorepo build? Looks like gst-libav is going to pull in FFmpeg, which isn't ideal, but oh well.

Apologies for all the questions -- I don't actually use gstreamer, so I'm not familiar at all with it.

[nirbheek]

I take it this means meson ... && ninja ... from a Git tag should just Do The Right Thing then?

Yes. You may like to use --wrap-mode=nodownload so that meson doesn't download anything behind your back (I guess you already have abstractions for this for use with other meson formula?), and you want to look at meson_options.txt for things to enable. You can pass -Dbase=enabled etc to enable each component.

Another thing distros do is to pass --auto-features=enabled and then manually disable everything you don't want. That way you don't have any 'automagic' dependencies. But that's a lot of work, since there's dozens of plugins. You can skip that and just specifically enable the plugins that you want to ship, like so: -Dbad=enabled -Dgst-plugins-bad:srtp=enabled.

I take it only the ones that are prefixed with gst- are the plugins that will be replaced by a monorepo build?

Yes, except for gst-plugins-rs, which is a separate repository. However, you can actually build it using this setup, by passing -Drs=enabled. Since you probably want to control what's downloaded yourself, you will want to set up subprojects/gst-plugins-rs yourself with, f.ex., meson subprojects download gst-plugins-rs before running meson setup. Starting from 1.22 (and the 1.21 dev releases), there will be a corresponding tag in gst-plugins-rs for each gstreamer release. In 1.20 you're supposed to use the 0.8 release branch.

Apologies for all the questions -- I don't actually use gstreamer, so I'm not familiar at all with it.

That's ok, I'm happy someone is having a look at fixing up the gstreamer brew formulae :)

[KANIYONIKA]

Thank you for your discussion!!
I am ashamed to say that I don't think I can do it, so we will wait for someone else to do it.

[carlocab]

I'll try to get this done at Homebrew/homebrew-core#113061.

[KANIYONIKA]

Thank you✨Nice Guy!!

[danburkert]

Setting env GST_PLUGIN_PATH=/opt/homebrew/lib appears to be a workaround, although it causes gstreamer to issue a warning log for every non-plugin dylib in that directory which it can't load. Perhaps setting it to a more targeted list of the plugin dylibs would fix that.

[carlocab]

Try

plugin_libdirs=("$(brew --prefix)"/opt/gst-*/lib)
export GST_PLUGIN_PATH="${(j|:|)plugin_libdirs}"

⚠️ Zsh syntax, may not work on other shells

[carlocab]

I've opened Homebrew/homebrew-core#125996 to try to get this done. @nirbheek, I'd appreciate it if you could have a look. In particular, there are options we used to pass to what will now be subprojects which I'm not sure how to handle from a meson invocation.

[carlocab]

Hmmm, ok, one issue is that gst-plugins-bad depends on libnice. Except that libnice also depends on gstreamer, so once gst-plugins-bad is built as part of the gstreamer monorepo, we have a circular dependency:

gstreamer -> libnice -> gstreamer

Not quite sure how to resolve this, so I guess I'm blocked here.

[carlocab]

I've merged Homebrew/homebrew-core#125996. Give it about ~20 minutes for the API to update then do brew update && brew upgrade gstreamer.

[mraerino]

i'm still seeing issue with using gstreamer in a Rust application:

% PKG_CONFIG_PATH=/opt/homebrew/lib/pkgconfig:/opt/homebrew/share/pkgconfig cargo build -v
-- snip --
     Running `rustc --crate-name gstreamer --edition=2021 /Users/marcus/.cargo/registry/src/index.crates.io-6f17d22bba15001f/gstreamer-0.20.5/src/lib.rs --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C split-debuginfo=unpacked -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="serde"' --cfg 'feature="serde_bytes"' --cfg 'feature="v1_16"' --cfg 'feature="v1_18"' --cfg 'feature="v1_20"' --cfg 'feature="v1_22"' -C metadata=fa913bb4cf74ffa4 -C extra-filename=-fa913bb4cf74ffa4 --out-dir /Users/marcus/src/mraerino/merdia/target/debug/deps -L dependency=/Users/marcus/src/mraerino/merdia/target/debug/deps -L native=/opt/homebrew/Cellar/glib/2.76.2/lib -L native=/opt/homebrew/opt/gettext/lib -L native=/opt/homebrew/Cellar/glib/2.76.2/lib -L native=/opt/homebrew/opt/gettext/lib -L native=/opt/homebrew/Cellar/glib/2.76.2/lib -L native=/opt/homebrew/opt/gettext/lib -L native=/opt/homebrew/Cellar/glib/2.76.2/lib -L native=/opt/homebrew/opt/gettext/lib -L native=/opt/homebrew/Cellar/gstreamer/1.22.2/lib -L native=/opt/homebrew/Cellar/glib/2.76.2/lib -L native=/opt/homebrew/opt/gettext/lib`
-- snip --

% ./target/debug/mybin

(<unknown>:64557): GStreamer-WARNING **: 22:52:10.815: External plugin loader failed. This most likely means that the plugin loader helper binary was not found or could not be run. You might need to set the GST_PLUGIN_SCANNER environment variable if your setup is unusual. This should normally not be required though.
thread 'tokio-runtime-worker' panicked at 'Could not find webrtcbin', src/main.rs:129:50

in contrast, it works when using the libraries directly provided by gstreamer:

% PKG_CONFIG_PATH=/Library/Frameworks/GStreamer.framework/Versions/Current/lib/pkgconfig cargo build -v
     Running `rustc --crate-name gstreamer --edition=2021 /Users/marcus/.cargo/registry/src/index.crates.io-6f17d22bba15001f/gstreamer-0.20.5/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=122 --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C split-debuginfo=unpacked -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="serde"' --cfg 'feature="serde_bytes"' --cfg 'feature="v1_16"' --cfg 'feature="v1_18"' --cfg 'feature="v1_20"' --cfg 'feature="v1_22"' -C metadata=fa913bb4cf74ffa4 -C extra-filename=-fa913bb4cf74ffa4 --out-dir /Users/marcus/src/mraerino/merdia/target/debug/deps -L dependency=/Users/marcus/src/mraerino/merdia/target/debug/deps --cap-lints allow -L native=/Library/Frameworks/GStreamer.framework/Versions/Current/lib/pkgconfig/../../lib -L native=/Library/Frameworks/GStreamer.framework/Versions/Current/lib/pkgconfig/../../lib -L native=/Library/Frameworks/GStreamer.framework/Versions/Current/lib/pkgconfig/../../lib -L native=/Library/Frameworks/GStreamer.framework/Versions/Current/lib/pkgconfig/../../lib -L native=/Library/Frameworks/GStreamer.framework/Versions/Current/lib/pkgconfig/../../lib`

is there anything i can do to debug this?

[razvanphp]

Any news about the webrtc plugin / libnice support?

[nirbheek]

@carlocab I've opened a merge request with a fix for this issue: https://gitlab.freedesktop.org/libnice/libnice/-/merge_requests/271

I recommend that you split libnice into two packages:

1. libnice
   • Build with -Dgstreamer=disabled
2. libnice-gstreamer
   • Apply the changes from the MR
   • Build with -Dgstreamer=enabled -Dgstreamer-plugin-only=true

Don't wait for the patch to get upstreamed, I will help you maintain it.

[nirbheek]

@carlocab poke again 🙂 or could you please point this to the current formula maintainer for gstreamer? We regularly get people on our support channels asking about this 😅

[carlocab]

All formulae in Homebrew/core are community maintained, so each formula doesn't have a specific maintainer. But I've opened Homebrew/homebrew-core#171902 to see if we can do this.

[nirbheek]

Thanks Carlo!