smartMedia is a fully customizable multi threaded media converter, ingestion and delivery tool that runs standalone and inside Nuke. It lets you convert image and video based media from one format into another using Nuke under the hood. Due to using Nuke's node based workflow this means full flexibility to create any output you like - including custom slates and burnins. And if you have some programing knowledge you can take over full controll and customize it heavily to your needs.
https://aescripts.com/smartmedia/