Parse WebVTT to POCO ready for indexing using Azure Search.

webvttpocoparser.cs

static List<IndexText> Parse(string vtt, string videoId){
    string[] lines = vtt.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);

    var tcStart = default(TimeSpan);
    var tcEnd = default(TimeSpan);

    var indexList = new List<IndexText>();

    foreach (var l in lines)
    {
        if (l == "WEBVTT" || string.IsNullOrWhiteSpace(l))
        {
            continue;
        }

        if (l.IndexOf("-->") != -1)
        {
            //this is a timecode
            var tc = l.Replace("-->", "|").Split('|');

            tcStart = TimeSpan.Parse(tc[0]);
            tcEnd = TimeSpan.Parse(tc[1]);
        }
        else
        {
            var s = tcStart.TotalMilliseconds.ToString();
            var e = tcEnd.TotalMilliseconds.ToString();
            //this is text
            var idx = new IndexText
            {
                Text = l,
                Start = s, 
                End = e,
                IndexId = videoId + s + e,
                VideoId = videoId

            };
            indexList.Add(idx);
        }
    }

    return indexList;
}

public class IndexText
{
    [Key]
    [IsFilterable]
    public string IndexId { get; set; }
    public string Start { get; set; }
    public string End { get; set; }
    
    [IsSearchable]
    [Analyzer(AnalyzerName.AsString.EnLucene)]
    public string Text { get; set; }
    [IsSortable]
    [IsFilterable]
    [IsSearchable]
    public string VideoId { get; set; }
}