gstreamer1-libav, vimeo (h.264) and firefox 28

[Tijl Coosemans]

On Sat, 22 Mar 2014 00:46:18 -0700 (PDT) Jakub Lach wrote:
> It looks to me that after upgrading firefox to 28, gstreamer-ffmpeg is
> superseded by gstreamer1-libav, however the later doesn't support mp3
> decoding nor h.264 (at least it's not working with vimeo). I installed
> gstreamer1-libmad, so I have mp3 decoding (bandcamp, soundcloud works),
> but what about the video part?

Try installing multimedia/gstreamer1-plugins-core.  That should give you
a good set of plugins.

> Installing gstreamer1-plugins-x264 does not give me anything (previously
> it was the same- only ffmpeg plugin gave me full media support).

x264 is an encoder not a decoder.