支持从音频修正VTT字幕时间轴

src/N_m3u8DL-RE.Common/JsonContext/JsonContext.cs

@@ -16,6 +16,7 @@ namespace N_m3u8DL_RE.Common
     [JsonSerializable(typeof(IOrderedEnumerable<StreamSpec>))]
     [JsonSerializable(typeof(IEnumerable<MediaSegment>))]
     [JsonSerializable(typeof(List<StreamSpec>))]
+    [JsonSerializable(typeof(List<MediaSegment>))]
     [JsonSerializable(typeof(Dictionary<string, string>))]
     internal partial class JsonContext : JsonSerializerContext { }
 }

src/N_m3u8DL-RE.Common/Resource/ResString.cs

@@ -72,6 +72,7 @@ namespace N_m3u8DL_RE.Common.Resource
         public static string cmd_liveRecordLimit { get => GetText("cmd_liveRecordLimit"); }
         public static string cmd_taskStartAt { get => GetText("cmd_taskStartAt"); }
         public static string cmd_liveWaitTime { get => GetText("cmd_liveWaitTime"); }
+        public static string cmd_liveFixVttByAudio { get => GetText("cmd_liveFixVttByAudio"); }
         public static string cmd_liveRealTimeMerge { get => GetText("cmd_liveRealTimeMerge"); }
         public static string cmd_livePerformAsVod { get => GetText("cmd_livePerformAsVod"); }
         public static string cmd_muxAfterDone { get => GetText("cmd_muxAfterDone"); }

src/N_m3u8DL-RE.Common/Resource/StaticText.cs

@@ -154,6 +154,12 @@ namespace N_m3u8DL_RE.Common.Resource
                 zhTW: "mkvmerge可執行程序全路徑, 例如 C:\\Tools\\mkvmerge.exe",
                 enUS: "Full path to the mkvmerge binary, like C:\\Tools\\mkvmerge.exe"
             ),
+            ["cmd_liveFixVttByAudio"] = new TextContainer
+            (
+                zhCN: "通过读取音频文件的起始时间修正VTT字幕",
+                zhTW: "透過讀取音訊檔案的起始時間修正VTT字幕",
+                enUS: "Correct VTT sub by reading the start time of the audio file"
+            ),
             ["cmd_header"] = new TextContainer
             (
                 zhCN: "为HTTP请求设置特定的请求头, 例如:\r\n-H \"Cookie: mycookie\" -H \"User-Agent: iOS\"",

src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs

@@ -79,6 +79,7 @@ namespace N_m3u8DL_RE.CommandLine
         private readonly static Option<bool> LivePipeMux = new(new string[] { "--live-pipe-mux" }, description: ResString.cmd_livePipeMux, getDefaultValue: () => false);
         private readonly static Option<TimeSpan?> LiveRecordLimit = new(new string[] { "--live-record-limit" }, description: ResString.cmd_liveRecordLimit, parseArgument: ParseLiveLimit) { ArgumentHelpName = "HH:mm:ss" };
         private readonly static Option<int?> LiveWaitTime = new(new string[] { "--live-wait-time" }, description: ResString.cmd_liveWaitTime) { ArgumentHelpName = "SEC" };
+        private readonly static Option<bool> LiveFixVttByAudio = new(new string[] { "--live-fix-vtt-by-audio" }, description: ResString.cmd_liveFixVttByAudio, getDefaultValue: () => false);
 
 
         //复杂命令行如下
@@ -418,6 +419,7 @@ namespace N_m3u8DL_RE.CommandLine
                     TaskStartAt = bindingContext.ParseResult.GetValueForOption(TaskStartAt),
                     LivePerformAsVod = bindingContext.ParseResult.GetValueForOption(LivePerformAsVod),
                     LivePipeMux = bindingContext.ParseResult.GetValueForOption(LivePipeMux),
+                    LiveFixVttByAudio = bindingContext.ParseResult.GetValueForOption(LiveFixVttByAudio),
                     UseSystemProxy = bindingContext.ParseResult.GetValueForOption(UseSystemProxy),
                     CustomProxy = bindingContext.ParseResult.GetValueForOption(CustomProxy),
                     LiveWaitTime = bindingContext.ParseResult.GetValueForOption(LiveWaitTime),
@@ -487,7 +489,7 @@ namespace N_m3u8DL_RE.CommandLine
                 LogLevel, UILanguage, UrlProcessorArgs, Keys, KeyTextFile, DecryptionBinaryPath, UseShakaPackager, MP4RealTimeDecryption,
                 MuxAfterDone,
                 CustomHLSMethod, CustomHLSKey, CustomHLSIv, UseSystemProxy, CustomProxy, TaskStartAt,
-                LivePerformAsVod, LiveRealTimeMerge, LiveKeepSegments, LivePipeMux, LiveRecordLimit, LiveWaitTime,
+                LivePerformAsVod, LiveRealTimeMerge, LiveKeepSegments, LivePipeMux, LiveFixVttByAudio, LiveRecordLimit, LiveWaitTime,
                 MuxImports, VideoFilter, AudioFilter, SubtitleFilter, DropVideoFilter, DropAudioFilter, DropSubtitleFilter, MoreHelp
             };
 

src/N_m3u8DL-RE/CommandLine/MyOption.cs

@@ -226,5 +226,9 @@ namespace N_m3u8DL_RE.CommandLine
         /// See: <see cref="CommandInvoker.LivePipeMux"/>.
         /// </summary>
         public bool LivePipeMux { get; set; }
+        /// <summary>
+        /// See: <see cref="CommandInvoker.LiveFixVttByAudio"/>.
+        /// </summary>
+        public bool LiveFixVttByAudio { get; set; }
     }
 }

src/N_m3u8DL-RE/DownloadManager/SimpleLiveRecordManager2.cs

@@ -45,6 +45,9 @@ namespace N_m3u8DL_RE.DownloadManager
         ConcurrentDictionary<int, long> DateTimeDic = new(); //上次下载的dateTime
         CancellationTokenSource CancellationTokenSource = new(); //取消Wait
 
+        private readonly object lockObj = new object();
+        TimeSpan? audioStart = null;
+
         public SimpleLiveRecordManager2(DownloaderConfig downloaderConfig, List<StreamSpec> selectedSteams, StreamExtractor streamExtractor)
         {
             this.DownloaderConfig = downloaderConfig;
@@ -248,6 +251,10 @@ namespace N_m3u8DL_RE.DownloadManager
                             Logger.WarnMarkUp(ResString.readingInfo);
                             mediaInfos = await MediainfoUtil.ReadInfoAsync(DownloaderConfig.MyOptions.FFmpegBinaryPath!, result.ActualFilePath);
                             mediaInfos.ForEach(info => Logger.InfoMarkUp(info.ToStringMarkUp()));
+                            lock (lockObj)
+                            {
+                                if (audioStart == null) audioStart = mediaInfos.FirstOrDefault(x => x.Type == "Audio")?.StartTime;
+                            }
                             ChangeSpecInfo(streamSpec, mediaInfos, ref useAACFilter);
                             readInfo = true;
                         }
@@ -324,6 +331,10 @@ namespace N_m3u8DL_RE.DownloadManager
                             Logger.WarnMarkUp(ResString.readingInfo);
                             mediaInfos = await MediainfoUtil.ReadInfoAsync(DownloaderConfig.MyOptions.FFmpegBinaryPath!, result!.ActualFilePath);
                             mediaInfos.ForEach(info => Logger.InfoMarkUp(info.ToStringMarkUp()));
+                            lock (lockObj)
+                            {
+                                if (audioStart == null) audioStart = mediaInfos.FirstOrDefault(x => x.Type == "Audio")?.StartTime;
+                            }
                             ChangeSpecInfo(streamSpec, mediaInfos, ref useAACFilter);
                             readInfo = true;
                         }
@@ -367,7 +378,13 @@ namespace N_m3u8DL_RE.DownloadManager
                     foreach (var seg in keys)
                     {
                         var vttContent = File.ReadAllText(FileDic[seg]!.ActualFilePath);
-                        var vtt = WebVttSub.Parse(vttContent);
+                        var waitCount = 0;
+                        while (DownloaderConfig.MyOptions.LiveFixVttByAudio && audioStart == null && waitCount++ < 5)
+                        {
+                            await Task.Delay(1000);
+                        }
+                        var subOffset = audioStart != null ? (long)audioStart.Value.TotalMilliseconds : 0L;
+                        var vtt = WebVttSub.Parse(vttContent, subOffset);
                         //手动计算MPEGTS
                         if (currentVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                         {
@@ -773,6 +790,11 @@ namespace N_m3u8DL_RE.DownloadManager
                 if (WAIT_SEC <= 0) WAIT_SEC = 1;
                 Logger.WarnMarkUp($"set refresh interval to {WAIT_SEC} seconds");
             }
+            //如果没有选中音频 取消通过音频修复vtt时间轴
+            if (!SelectedSteams.Any(x => x.MediaType == MediaType.AUDIO))
+            {
+                DownloaderConfig.MyOptions.LiveFixVttByAudio = false;
+            }
 
             /*//写出master
             if (DownloaderConfig.MyOptions.LiveWriteHLS)

src/N_m3u8DL-RE/Entity/Mediainfo.cs

@@ -16,6 +16,7 @@ namespace N_m3u8DL_RE.Entity
         public string? Resolution { get; set; }
         public string? Fps { get; set; }
         public string? Type { get; set; }
+        public TimeSpan? StartTime { get; set; }
         public bool DolbyVison { get; set; }
         public bool HDR { get; set; }
 

src/N_m3u8DL-RE/N_m3u8DL-RE.csproj

@@ -7,7 +7,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
 	<LangVersion>preview</LangVersion>
     <Nullable>enable</Nullable>
-	<Version>0.1.5.3</Version>
+	<Version>0.1.5.4</Version>
 	<Platforms>AnyCPU;x64</Platforms>
   </PropertyGroup>
 

src/N_m3u8DL-RE/Util/MediainfoUtil.cs

@@ -30,6 +30,8 @@ namespace N_m3u8DL_RE.Util
         private static partial Regex FpsRegex();
         [GeneratedRegex("DOVI configuration record.*profile: (\\d).*compatibility id: (\\d)")]
         private static partial Regex DoViRegex();
+        [GeneratedRegex("Duration.*?start: (\\d+\\.?\\d{0,3})")]
+        private static partial Regex StartRegex();
 
         public static async Task<List<Mediainfo>> ReadInfoAsync(string binary, string file)
         {
@@ -73,6 +75,13 @@ namespace N_m3u8DL_RE.Util
                     )
                     info.DolbyVison = true;
 
+                if (StartRegex().IsMatch(output))
+                {
+                    var f = StartRegex().Match(output).Groups[1].Value;
+                    if (double.TryParse(f, out var d))
+                        info.StartTime = TimeSpan.FromSeconds(d);
+                }
+
                 result.Add(info);
             }