Where can I take C libraries? about obs-gstreamer HOT 5 CLOSED

That depends on the target platform. And even then there are often several possibilities. Especially Linux and Windows differ significantly here.

GStreamer offers prebuild binaries for Windows and macOS. They can be a good start. The OBS library should come with OBS (I would assume) - I actually build mine myself. This really depends on a lot which toolchains you want to use. If you give some more details what exactly you aim for I can give some more hints.

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I'm using ubuntu

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For installing GStreamer then:

sudo apt install libgstreamer1.0-dev

For OBS I'm a bit unsure as my copy was build from source. I think there is some installer provided by OBS? Ideally it also install the required libobs.so.

Maybe you need to run:

sudo ldconfig

To make the system locate and find the libobs.so once.

If you follow the build instructions in the README.md it should work. But report back if not.

EDIT:
You may need:

sudo apt install libgstreamer-plugins-base1.0-dev

This pretty much depends on how your distro splits up the GStreamer development packages. Perhaps there are specific -video, -audio, -app packages too..

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How to fix it?

meson.build:24:27: ERROR: Unknown method "has_link_argument" in object.

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I think you need to update meson. Or change the unknown command to has_argument. That should work too.

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