Bryan,
I'm a little concerned about your assumption that: "va-driver-all is already brought in by gstreamer1.0-libav"
While that might be true, be careful to not confuse libav with libva. They are very different things.
I would prefer that we explicitly pulled in va-driver-all, which is required for gstreamer1.0-vaapi and other things to work.
Bryan,
I'm a little concerned about your assumption that:
"va-driver-all is already brought in by gstreamer1.0-libav"
While that might be true, be careful to not confuse libav with libva. They are very different things.
I would prefer that we explicitly pulled in va-driver-all, which is required for gstreamer1.0-vaapi and other things to work.