How is GstVideoCropMeta supposed to be used?

[Carlos Rafael Giani]

On 2013-08-25 18:08, Tim-Philipp Müller wrote:
> videoparse? Did you mean the videocrop element? If yes, then the answer
> is that it should use the crop meta if downstream supports that, though
> it appears that that's not implemented yet.

Yes, I meant videocrop. But how could it know if downstream supports 
that? I do not see a query for finding that out in the API.