Gstreamer plugin missing ["videoconvert", "videoscale"]

General Discussion
,
1

I have installed gstreamer 1.24.7. I was trying to run the webrtc rust example. But I kept getting missing plugins for ["videoconvert, "videoscale"]. I decided to create a new project with following dependencies:

[dependencies]
cocoa = "0.26.0"
gstreamer = "0.23.1"
objc = "0.2.7"

I tried running the following snippet

fn tutorial_main() {
    gstreamer::init().unwrap();
    let needed = [
        "videoconvert",
        "videoscale",
    ];

    let registry = gstreamer::Registry::get();
    let missing = needed
        .iter()
        .filter(|n| registry.find_plugin(n).is_none())
        .cloned()
        .collect::<Vec<_>>();

    if !missing.is_empty() {
        println!("Missing plugins: {:?}", missing);
    }
}

I still get the same error. But then when I was trying the Basic Tutorial 3 - Exercise, which makes use of the videoconvert element, I’m able to run it.

Even doing a gst-inspect on them shows that they exist.
Any idea on why this happening and how to resolve it?

2

How did you install GStreamer?

3

Through the .pkg files listed here

4

Is there a difference between the way these two are handled?

let convert = gst::ElementFactory::make("videoconvert")
        .name("convert")
        .build()
        .expect("Could not create convert element.");

and

let missing = gstreamer::Registry::get().find_plugin("videoconvert");

And if gst-inspect-1.0 videoconvert is working, then there shouldn’t be a problem right?

5

Starting with 1.24, the plugins videoconvert and videoscale were merged into one plugin: videoconvertscale. The videoconvert and videoscale elements (aka plugin features) are still available.

With gstreamer::Registry::get().find_plugin() you are searching for plugin names, and with gst::ElementFactory::make() (or find) you are searching for elements.

Plugin names are not a stable ABI in GStreamer, but plugin features are.

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