This reverts part of "visual: enable commented out code again."
(commit 8222ba16c8).
The shader code does indeed look broken (or rather,
it makes assumptions that are not necessarily true here,
namly that pixel stride is 4, for example), which
makes totem very crashy and causes other weird behaviour.
Also see https://bugzilla.gnome.org/show_bug.cgi?id=683527
Add support for GstVideoMeta and GstVideoFrame.
Remove some redundant fields that are also in GstVideoInfo
Disable the shader code, it looks broken.
Fixes https://bugzilla.gnome.org/show_bug.cgi?id=681719