Issue with dataurisrc and Rust: streaming stopped, reason not-linked (-1)

[Nazar Mokrynskyi]

Hi folks,
I'm new to Rust and new to Gstreamer, so this may be a simple question, 
but I'd be really helpful for any directions.

Essentially I want to turn this:

> gst-launch-1.0 dataurisrc 
> uri="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==" 
> ! pngdec ! imagefreeze ! videoconvert ! autovideosink
Which works fine, into Rust code.

What I have so far is this:

> extern crate gstreamer as gst;
> use gst::prelude::*;
>
> extern crate glib;
>
> fn main() {
>     gst::init().unwrap();
>
>     let base64_image = 
> "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==";
>
>     let pipeline = gst::Pipeline::new(None);
>
>     let image = gst::ElementFactory::make("dataurisrc", None).unwrap();
>     let pngdec = gst::ElementFactory::make("pngdec", None).unwrap();
>     let imagefreeze = gst::ElementFactory::make("imagefreeze", 
> None).unwrap();
>     let videoconvert = gst::ElementFactory::make("videoconvert", 
> None).unwrap();
>     let autovideosink = gst::ElementFactory::make("autovideosink", 
> None).unwrap();
>
>     image.set_property_from_str("uri", base64_image);
>     gst::Element::link_many(&[&image, &pngdec, &imagefreeze, 
> &videoconvert, &autovideosink]).unwrap();
>
>     pipeline.add_many(&[&image, &pngdec, &imagefreeze, &videoconvert, 
> &autovideosink]).unwrap();
>
>     pipeline
>         .set_state(gst::State::Playing)
>         .expect("Unable to set the pipeline to the `Playing` state");
>
>     let bus = pipeline.get_bus().unwrap();
>
>     for msg in bus.iter_timed(gst::CLOCK_TIME_NONE) {
>         use gst::MessageView;
>
>         match msg.view() {
>             MessageView::Eos(..) => break,
>             MessageView::Error(err) => {
>                 println!(
>                     "Error from {:?}: {} ({:?})",
>                     err.get_src().map(|s| s.get_path_string()),
>                     err.get_error(),
>                     err.get_debug()
>                 );
>                 break;
>             }
>             _ => (),
>         }
>     }
>
>     pipeline
>         .set_state(gst::State::Null)
>         .expect("Unable to set the pipeline to the `Null` state");
> }
However when I try to run it (with stable version of gstreamer crate) I 
get this:
> 0:00:00.023632544 20196 0x5632ff4081e0 WARN                 basesrc 
> gstbasesrc.c:3072:gst_base_src_loop:<dataurisrc0> error: Internal data 
> stream error.
> 0:00:00.023657375 20196 0x5632ff4081e0 WARN basesrc 
> gstbasesrc.c:3072:gst_base_src_loop:<dataurisrc0> error: streaming 
> stopped, reason not-linked (-1)
> Error from Some(Owned(0x5632ff429c40, 48)): Internal data stream 
> error. (Some("gstbasesrc.c(3072): gst_base_src_loop (): 
> /GstPipeline:pipeline0/GstDataURISrc:dataurisrc0:\nstreaming stopped, 
> reason not-linked (-1)"))
All pads should always be available, so I'm a bit confused by this. Any 
ideas?

-- 
Sincerely, Nazar Mokrynskyi