I've seen this issue recently, all gst-plugin packages should be equal in version. It might be that you have different versions of these plugins packages masked so prevent them to upgrade to their compatible versions.
Daniel
- [gentoo-user] gst-plugins-bad-1.11.90 is blocking gst-plugin... Hubert Hauser
- Re: [gentoo-user] gst-plugins-bad-1.11.90 is blocking g... daniel
- [gentoo-user] Re: gst-plugins-bad-1.11.90 is blocking g... Kai Krakow
- Re: Re: [gentoo-user] gst-plugins-bad-1.11.90 is blocki... Hubert Hauser
