http://lomteqnxehqjdemqgzse7xchjlusgnpoxq2fpmz3yuukyfzc22t5gwyd.onion/jira_projects/browse/HLS-8.html
Might need to make a special case for things like cache:URL (tell ffmpeg to cache the URL to a local file and then use it) as it excludes the slash. Similarly file: should be treated as if the user had just specified a path. Alternatively, as ffmpeg will complain if the file doesn't exist anyway, it might be as simple to just remove the check for the input file (though we may then end up creating an output directory and erroring out just after).