How do I create an OGV file?

Excuse me, I'm wondering how exactly one goes about creating an OGV file. Is there a specific software I need to use, or is there a standard method of conversion from other file formats? Could you walk me through the steps of creating an OGV file from start to finish? Are there any potential challenges or roadblocks I should be aware of when trying to create one? Thank you for your time and assistance.