支持大于1800分片调用ffmpeg合并 fix #7

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

@@ -72,6 +72,7 @@ namespace N_m3u8DL_RE.Common.Resource
         public static string liveLimit { get => GetText("liveLimit"); }
         public static string liveLimitReached { get => GetText("liveLimitReached"); }
         public static string saveName { get => GetText("saveName"); }
+        public static string partMerge { get => GetText("partMerge"); }
         public static string fetch { get => GetText("fetch"); }
         public static string ffmpegMerge { get => GetText("ffmpegMerge"); }
         public static string ffmpegNotFound { get => GetText("ffmpegNotFound"); }

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

@@ -583,6 +583,12 @@ namespace N_m3u8DL_RE.Common.Resource
                 zhTW: "內容匹配: [white on deepskyblue1]HTTP Live Streaming[/]",
                 enUS: "Content Matched: [white on deepskyblue1]HTTP Live Streaming[/]"
             ),
+            ["partMerge"] = new TextContainer
+            (
+                zhCN: "分片数量大于1800个，开始分块合并...",
+                zhTW: "分片數量大於1800個，開始分塊合併...",
+                enUS: "Segments more than 1800, start partial merge..."
+            ),
             ["notSupported"] = new TextContainer
             (
                 zhCN: "当前输入不受支持: ",

src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs

@@ -11,6 +11,7 @@ using N_m3u8DL_RE.Util;
 using Spectre.Console;
 using Spectre.Console.Rendering;
 using System.Collections.Concurrent;
+using System.IO;
 using System.Text;
 
 namespace N_m3u8DL_RE.DownloadManager
@@ -509,6 +510,20 @@ namespace N_m3u8DL_RE.DownloadManager
                     {
                         Logger.WarnMarkUp($"{Path.GetFileName(ffOut)} => {Path.GetFileName(ffOut = Path.ChangeExtension(ffOut, $"copy" + Path.GetExtension(ffOut)))}");
                     }
+                    //大于1800分片，需要分步骤合并
+                    if (files.Length >= 1800)
+                    {
+                        Logger.WarnMarkUp(ResString.partMerge);
+                        files = MergeUtil.PartialCombineMultipleFiles(files);
+                        FileDic.Clear();
+                        foreach (var item in files)
+                        {
+                            FileDic[new MediaSegment() { Url = item }] = new DownloadResult()
+                            {
+                                ActualFilePath = item
+                            };
+                        }
+                    }
                     mergeSuccess = MergeUtil.MergeByFFmpeg(DownloaderConfig.MyOptions.FFmpegBinaryPath!, files, Path.ChangeExtension(ffOut, null), ext, useAACFilter);
                     if (mergeSuccess) output = ffOut;
                 }

src/N_m3u8DL-RE/Util/MergeUtil.cs

@@ -75,6 +75,38 @@ namespace N_m3u8DL_RE.Util
             p.WaitForExit();
         }
 
+        public static string[] PartialCombineMultipleFiles(string[] files)
+        {
+            var newFiles = new List<string>();
+            int div = 0;
+            if (files.Length <= 90000)
+                div = 100;
+            else
+                div = 200;
+
+            string outputName = Path.GetDirectoryName(files[0]) + "\\T";
+            int index = 0; //序号
+
+            //按照div的容量分割为小数组
+            string[][] li = Enumerable.Range(0, files.Count() / div + 1).Select(x => files.Skip(x * div).Take(div).ToArray()).ToArray();
+            foreach (var items in li)
+            {
+                if (items.Count() == 0)
+                    continue;
+                var output = outputName + index.ToString("0000") + ".ts";
+                CombineMultipleFilesIntoSingleFile(items, output);
+                newFiles.Add(output);
+                //合并后删除这些文件
+                foreach (var item in items)
+                {
+                    File.Delete(item);
+                }
+                index++;
+            }
+
+            return newFiles.ToArray();
+        }
+
         public static bool MergeByFFmpeg(string binary, string[] files, string outputPath, string muxFormat, bool useAACFilter,
             bool fastStart = false,
             bool writeDate = true, string poster = "", string audioName = "", string title = "",