Hi, I'm having the same issue regarding the QML Video RTP source :
GStreamer; Unable to pause - "rtp://@231.1.128.20:8854"
No URI handler implemented for \"rtp\"."
Did you eventually got this video stream to run on Qt @Mark81 ? I'm also guessing some unsupported, most probably lacking gstream stuff.. still looking into it. I use Qt5.7.0