test: still trying to fix video tests

git-svn-id: svn://dev.exiv2.org/svn@3183 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
test: another effort to fix video tests

git-svn-id: svn://dev.exiv2.org/svn@3184 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
test: change the properties of the reference files

git-svn-id: svn://dev.exiv2.org/svn@3185 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3