public ActionResult DirectDownloadAudio([FromRoute] string vid)
        {
            if (!ValidateVid(vid))
            {
                return(BadRequest($"'{vid}' is not a valid video ID"));
            }

            var info = YoutubeHelper.GetVideoInfo(vid);

            if (info.DurationSeconds > (Max_Duration_Seconds * 2))
            {
                return(BadRequest($"Cannot process videos longer than {Max_Duration_Seconds * 2} seconds"));
            }

            var outputFilePath = $"{Output_Root}/yt/{vid}.mp3";

            if (System.IO.File.Exists(outputFilePath))
            {
                return(PhysicalFile(outputFilePath, "audio/mpeg", $"{info.Filename}-{vid}.mp3"));
            }

            var audio = YoutubeHelper.DownloadAudioMp3(vid);

            if (System.IO.File.Exists(audio))
            {
                return(PhysicalFile(audio, "audio/mpeg", $"{info.Filename}-{vid}.mp3"));
            }
            return(BadRequest("Video requested was not found"));
        }