    ﻿using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Text.RegularExpressions;

    namespace Nikse.SubtitleEdit.Core.SubtitleFormats
    {
        public class AvidCaption : SubtitleFormat
        {
            private static readonly Regex RegexTimeCodes = new Regex(@"^\d\d:\d\d:\d\d:\d\d \d\d:\d\d:\d\d:\d\d$", RegexOptions.Compiled);

            public override string Extension => ".txt";

            public override string Name => "Avid Caption";

            public override string ToText(Subtitle subtitle, string title)
            {
                var sb = new StringBuilder();
                sb.AppendLine("@ This file written with the Avid Caption plugin, version 1");
                sb.AppendLine();
                sb.AppendLine("<begin subtitles>");
                const string writeFormat = "{0} {1}{2}{3}{2}";
                foreach (Paragraph p in subtitle.Paragraphs)
                {
                    sb.AppendLine(string.Format(writeFormat, p.StartTime.ToHHMMSSFF(), EncodeEndTimeCode(p.EndTime), Environment.NewLine, HtmlUtil.RemoveHtmlTags(p.Text, true)));
                    //00:50:34:22 00:50:39:13
                    //Ich muss dafür sorgen,
                    //dass die Epsteins weiterleben
                }
                sb.AppendLine("<end subtitles>");
                return sb.ToString();
            }

            private static string EncodeEndTimeCode(TimeCode time)
            {
                //00:50:39:13 (last is frame)

                //Bugfix for Avid - On 23.976 FPS and 24 FPS projects, when the End time of a subtitle ends in 02, 07, 12, 17, 22, 27 frames, the subtitle won't import.
                if (Math.Abs(Configuration.Settings.General.CurrentFrameRate - 23.976) < 0.01 ||
                    Math.Abs(Configuration.Settings.General.CurrentFrameRate - 24) < 0.01)
                {
                    var frames = MillisecondsToFramesMaxFrameRate(time.Milliseconds);
                    if (frames == 2 || frames == 7 || frames == 12 || frames == 17 || frames == 22 || frames == 27)
                        frames--;
                    return $"{time.Hours:00}:{time.Minutes:00}:{time.Seconds:00}:{frames:00}";
                }
                else
                {
                    return time.ToHHMMSSFF();
                }
            }

            public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
            {
                //00:03:15:22  00:03:23:10 This is line one.
                //This is line two.
                Paragraph p = null;
                subtitle.Paragraphs.Clear();
                _errorCount = 0;
                bool beginFound = false;
                bool endFound = false;
                foreach (string line in lines)
                {
                    string tline = line.Trim();
                    if (tline.Equals("<begin subtitles>", StringComparison.OrdinalIgnoreCase))
                    {
                        beginFound = true;
                    }
                    else if (tline.Equals("<end subtitles>", StringComparison.OrdinalIgnoreCase))
                    {
                        endFound = true;
                        break;
                    }

                    if (line.IndexOf(':') == 2 && RegexTimeCodes.IsMatch(line))
                    {
                        string temp = line.Substring(0, RegexTimeCodes.Match(line).Length);
                        string start = temp.Substring(0, 11);
                        string end = temp.Substring(12, 11);

                        string[] startParts = start.Split(SplitCharColon, StringSplitOptions.RemoveEmptyEntries);
                        string[] endParts = end.Split(SplitCharColon, StringSplitOptions.RemoveEmptyEntries);
                        if (startParts.Length == 4 && endParts.Length == 4)
                        {
                            p = new Paragraph(DecodeTimeCodeFramesFourParts(startParts), DecodeTimeCodeFramesFourParts(endParts), string.Empty);
                            subtitle.Paragraphs.Add(p);
                        }
                    }
                    else if (tline.Length == 0 || tline[0] == '@')
                    {
                        // skip these lines
                    }
                    else if (tline.Length > 0 && p != null)
                    {
                        if (string.IsNullOrEmpty(p.Text))
                            p.Text = line;
                        else
                            p.Text = p.Text.TrimEnd() + Environment.NewLine + line;
                    }
                }
                if (!beginFound)
                    _errorCount++;
                if (!endFound)
                    _errorCount++;

                subtitle.Renumber();
            }

        }
    }

↑ V3063 A part of conditional expression is always true if it is evaluated: tline.Length > 0.