After upgrade to 3.4.0.24 one more time, I finally manage to get gstreamer-based players (e.g. harbour-videoPLayer) work on my scorpion-windy.

As I mentioned before, gstreamer1.0-droid become incompatible to the rest of gstreamer after upgraded to 3.3 or later, but gstreamer1.0-droid proves to be neither so essential to video playback, nor required by other vital components, and just uninstalling it could make video playback work, for gstreamer would switch to other working video sinks automatically.