videoscale: transform size sensitive metas
requested to merge michaelgruner/gst-plugins-base:videoscale-transform-size-sensitive-metas into master
Currently, videoscale just drops all metas that have other tags besides video. However videoscale wont change the colorspace or the orientation of the video so metas tagged as such may be copied safely. Additionaly, given that videoscale will change the frame size, we invoke the meta transform implementation to give it the opportunity to scale accordingly.