videoinfo: GST_VIDEO_FLAG_PREMULTIPLIED_ALPHA is not reflected in caps

Submitted by Stian Selnes @stianse

Link to original bug (#796144)

Description

Created attachment 372079
test for GST_VIDEO_FLAG_PREMULTIPLIED_ALPHA to/from caps

It would be nice if GST_VIDEO_FLAG_PREMULTIPLIED_ALPHA is reflected in the caps. Attached is a test case I would expect to work.

Patch 372079, "test for GST_VIDEO_FLAG_PREMULTIPLIED_ALPHA to/from caps":
0001-videoinfo-Add-test-for-GST_VIDEO_FLAG_PREMULTIPLIED_.patch