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I am trying to create a plugin (called frameselect) that will pass a video frame from a nvv4ldecoder element to a nvv4lh264enc based on the value of a custom metadata on the buffer. The transform method simply returns Ok(gst_base::BASE_TRANSFORM_FLOW_DROPPED) if the metadata specifies (by a bool field) that the buffer should not be passed to the encoder.

Given that the src caps of nvv4ldecoder are

  
  SRC template: 'src'
    Availability: Always
    Capabilities:
      video/x-raw(memory:NVMM)
                  width: [ 1, 2147483647 ]
                 height: [ 1, 2147483647 ]
              framerate: [ 0/1, 2147483647/1 ]

And the caps I specify in my plugin through gst::Caps::new_simple are

        let caps = gst::Caps::new_simple(
            "video/x-raw(memory:NVMM)",
            &[
                ("width", &gst::IntRange::<i32>::new(0, i32::MAX)),
                ("height", &gst::IntRange::<i32>::new(0, i32::MAX)),
                (
                    "framerate",
                    &gst::FractionRange::new(
                        gst::Fraction::new(0, 1),
                        gst::Fraction::new(i32::MAX, 1),
                    ),
                ),
            ],
        );

I get this error

0:00:00.468243547  7033 0x55d5222ee600 DEBUG     GST_PLUGIN_LOADING gstpluginfeature.c:116:gst_plugin_feature_load: loaded plugin frameselect
0:00:00.468256890  7033 0x55d5222ee600 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:359:gst_element_factory_create: creating element "frameselect" named "frameselect"
0:00:00.468271715  7033 0x55d5222ee600 DEBUG       GST_ELEMENT_PADS gstelement.c:302:gst_element_base_class_init: type GstBaseTransform : factory (nil)
0:00:00.468284816  7033 0x55d5222ee600 DEBUG          basetransform gstbasetransform.c:322:gst_base_transform_class_init: gst_base_transform_class_init
0:00:00.468301529  7033 0x55d5222ee600 DEBUG       GST_ELEMENT_PADS gstelement.c:302:gst_element_base_class_init: type FrameSelect : factory 0x55d5225214e0
0:00:00.468318759  7033 0x55d5222ee600 WARN               structure gststructure.c:197:gst_structure_validate_name: Invalid character '(' at offset 11 in structure name: video/x-raw(memory:NVMM)

I have tried setting the sink caps to video/x-raw, but the pads will fail to link due to intersection failure.

On nvidia forums, some have suggested using gst_caps_from_string instead of gst_caps_new_simple. This seems to be an issue on nvidia's end, but I would appreciate some advice on getting this to work in gstreamer-rs.