NDI metadata support

[darksidds]

I read the source code and found out that no metadata is being processed by the plugin. I wonder if there are any restrictions or it's just due to lack of need in there features? How difficult is it to implement this function?

[sdroege]

Metadata is now captured and printed to the logs but not made use of. There are no restrictions here, just that nobody implemented support for handling metadata yet.

[darksidds]

Thanks for your answer! Actually, as it turned out later on I needed per_buffer metadata but there were no such facilities, so I created my own implementation of transfering metadata as VideoCaptionMeta. Please, take a look at my pull-request #80