as far as I have seen, there is a possibility to embed (locally stored?) video files in documents on the ojs server using the feature.
However, I wonder whether it would be possible to link to an external streaming service, too. Background: Our OJS Server has large, however limited, filespace; I would prefer to stream media content from the video streaming server (using mms:// ) to save space and connection capacity …
The limitation here will be your PDF creation software (and the reader’s display software), not OJS. OJS will accept a PDF with arbitrary content. I’ve not heard of PDFs embedding streams, but it might be out there.