Merge commit '8e757716c61e0563a63829e30b02d5ba2a422ad6'

* commit '8e757716c61e0563a63829e30b02d5ba2a422ad6':
  avprobe: Print stereo3d information

This commit is not merged as it doesn't apply at all in our tree. The
two following commits will add the same feature.

Merged-by: Clément Bœsch <clement@stupeflix.com>