mafw-gst- should be related to the mediaplayer

You could check in fapman Fast Application Manager: There are some icons in the lower right corner, the one with 'C' seperates the packages in categories. Scroll down the categories to find the 'Advanced' -mode. Search for mafw-gst and figure out what might be missing.

mafw-gst-renderer is installed here on my device, there is also mafw-gst-subtitles-renderer