get_request_pad from encodebin return None

[RiccardoCagnasso]

Ok time to bother you guys with some more issues. 

1) Even if I set "avoid-reencoding" to True, it seems to re-encode h264
strems in my tests, see this example

https://imgur.com/a/E4PYKd3

2) If i set an encoder preset like this

        vaapih264enc = Gst.ElementFactory.make('vaapih264enc')
        Gst.Preset.save_preset(vaapih264enc, 'vaapih264enc_preset')
        video_profile = GstPbutils.EncodingVideoProfile.new(
            h264, None, Gst.Caps.from_string("video/x-h264"), 0)

and then I try to add two video streams, it fails to deliver the second
video_pad with

(launchmodule.py:7846): GStreamer-WARNING **: 08:45:35.152:
gst_value_deserialize_g_value_array: unimplemented

(launchmodule.py:7846): GStreamer-WARNING **: 08:45:35.152: Name
'vaapiencodeh264-0' is not unique in bin 'encodebin0', not adding

(launchmodule.py:7846): GStreamer-CRITICAL **: 08:45:35.152:
gst_element_get_static_pad: assertion 'GST_IS_ELEMENT (element)' failed

(launchmodule.py:7846): GStreamer-CRITICAL **: 08:45:35.152:
gst_pad_link_full: assertion 'GST_IS_PAD (srcpad)' failed

(launchmodule.py:7846): GStreamer-CRITICAL **: 08:45:35.152:
gst_element_set_state: assertion 'GST_IS_ELEMENT (element)' failed

(launchmodule.py:7846): GStreamer-CRITICAL **: 08:45:35.153: gst_bin_remove:
assertion 'GST_IS_ELEMENT (element)' failed

wich kind of makes sense considering that the preset is an instance of an
encoder, but how can i work around this?

3) I'm not entirely sure this is really encodebin related, but if I try to
encode a v4l2 stream (e.g. my webcam) or audio from microphone with pulse,
the pipeline seems fine but never actually start. 

https://imgur.com/a/xXTyZ1J



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