gstreamer: add linbice dependency

[aconchillo]

This enables the nice plugins and also adds the webrtcbin plugins from gst-plugins-bad.

Note, that this is different from the disabled libnice subproject. The subproject clones libnice and try to install it in the system, which we don't want. In contrast, adding the dependency just allows plugins to depend on the system installed one.

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• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
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[aconchillo]

The caveats addition is necessary because that's actually the real GStreamer plugin path. Otherwise, GStreamer will load plugins from the Cellar path instead and, for example, it won't load the gstreamer plugin that comes in libnice.

[aconchillo]

@chenrui333 any chance to add the Ci-long-timeout label again? Let me know if there's anything missing.

Btw, I'm also working on a current issue. Basically lots of GStreamer plugins are broken (at least on Apple Silicon), try for example:

gst-launch-1.0 videotestsrc ! fakesink

This is now fixed here: https://gitlab.freedesktop.org/gstreamer/orc/-/merge_requests/163. Once this is merged, I believe they will release a new ORC version. After that we will need a new revision of GStreamer to compile orc files with the new ORC.

[carlocab]

libnice depends on gstreamer, so this creates a circular dependency (which we can't have).

Also, setting GST_PLUGIN_SYSTEM_PATH seems to be discouraged by upstream maintainers. See #120206.

[aconchillo]

libnice depends on gstreamer, so this creates a circular dependency (which we can't have).

Also, setting GST_PLUGIN_SYSTEM_PATH seems to be discouraged by upstream maintainers. See #120206.

Should we create a gstreamer-libnice package that depends on gstreamer and then gstreamer can safely depend on libnice?

[aconchillo]

libnice depends on gstreamer, so this creates a circular dependency (which we can't have).
Also, setting GST_PLUGIN_SYSTEM_PATH seems to be discouraged by upstream maintainers. See #120206.

Should we create a gstreamer-libnice package that depends on gstreamer and then gstreamer can safely depend on libnice?

I'll give that a try...

[aconchillo]

Closing for now until I have something working locally.