增加码率选择器以及修复2处bug (#427)

* Prevent the ffmpeg-binary-path option from being accidentally overridden by the mux-after-done option.

* Add bandwidth filter

* Add bandwidth filter

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

@@ -477,7 +477,7 @@ namespace N_m3u8DL_RE.Common.Resource
                 zhCN: "通过正则表达式选择符合要求的视频流. 你能够以:分隔形式指定如下参数:\r\n\r\n" +
                       "id=REGEX:lang=REGEX:name=REGEX:codecs=REGEX:res=REGEX:frame=REGEX\r\n" +
                       "segsMin=number:segsMax=number:ch=REGEX:range=REGEX:url=REGEX\r\n" +
-                      "plistDurMin=hms:plistDurMax=hms:role=string:for=FOR\r\n\r\n" +
+                      "plistDurMin=hms:plistDurMax=hms:bwMin=int:bwMax=int:role=string:for=FOR\r\n\r\n" +
                       "* for=FOR: 选择方式. best[number], worst[number], all (默认: best)\r\n\r\n" +
                       "例如: \r\n" +
                       "# 选择最佳视频\r\n" +
@@ -486,11 +486,13 @@ namespace N_m3u8DL_RE.Common.Resource
                       "-sv res=\"3840*\":codecs=hvc1:for=best\r\n" +
                       "# 选择长度大于1小时20分钟30秒的视频\r\n" +
                       "-sv plistDurMin=\"1h20m30s\":for=best\r\n" +
-                      "-sv role=\"main\":for:best\r\n",
+                      "-sv role=\"main\":for=best\r\n" +
+                      "# 选择码率在800Kbps至1Mbps之间的视频\r\n" +
+                      "-sv bwMin=800:bwMax=1000\r\n",
                 zhTW: "通過正則表達式選擇符合要求的影片軌. 你能夠以:分隔形式指定如下參數:\r\n\r\n" +
                       "id=REGEX:lang=REGEX:name=REGEX:codecs=REGEX:res=REGEX:frame=REGEX\r\n" +
                       "segsMin=number:segsMax=number:ch=REGEX:range=REGEX:url=REGEX\r\n" +
-                      "plistDurMin=hms:plistDurMax=hms:role=string:for=FOR\r\n\r\n" +
+                      "plistDurMin=hms:plistDurMax=hms:bwMin=int:bwMax=int:role=string:for=FOR\r\n\r\n" +
                       "* for=FOR: 選擇方式. best[number], worst[number], all (默認: best)\r\n\r\n" +
                       "例如: \r\n" +
                       "# 選擇最佳影片\r\n" +
@@ -499,11 +501,13 @@ namespace N_m3u8DL_RE.Common.Resource
                       "-sv res=\"3840*\":codecs=hvc1:for=best\r\n" +
                       "# 選擇長度大於1小時20分鐘30秒的影片\r\n" +
                       "-sv plistDurMin=\"1h20m30s\":for=best\r\n" +
-                      "-sv role=\"main\":for:best\r\n",
+                      "-sv role=\"main\":for=best\r\n" +
+                      "# 選擇碼率在800Kbps至1Mbps之間的影片\r\n" +
+                      "-sv bwMin=800:bwMax=1000\r\n",
                 enUS: "Select video streams by regular expressions. OPTIONS is a colon separated list of:\r\n\r\n" +
                       "id=REGEX:lang=REGEX:name=REGEX:codecs=REGEX:res=REGEX:frame=REGEX\r\n" +
                       "segsMin=number:segsMax=number:ch=REGEX:range=REGEX:url=REGEX\r\n" +
-                      "plistDurMin=hms:plistDurMax=hms:role=string:for=FOR\r\n\r\n" +
+                      "plistDurMin=hms:plistDurMax=hms:bwMin=int:bwMax=int:role=string:for=FOR\r\n\r\n" +
                       "* for=FOR: Select type. best[number], worst[number], all (Default: best)\r\n\r\n" +
                       "Examples: \r\n" +
                       "# select best video\r\n" +
@@ -512,7 +516,9 @@ namespace N_m3u8DL_RE.Common.Resource
                       "-sv res=\"3840*\":codecs=hvc1:for=best\r\n" +
                       "# Select best video with duration longer than 1 hour 20 minutes 30 seconds\r\n" +
                       "-sv plistDurMin=\"1h20m30s\":for=best\r\n" +
-                      "-sv role=\"main\":for:best\r\n"
+                      "-sv role=\"main\":for=best\r\n" +
+                      "# Select video with bandwidth between 800Kbps and 1Mbps\r\n" +
+                      "-sv bwMin=800:bwMax=1000\r\n"
             ),
             ["cmd_selectAudio"] = new TextContainer
             (
@@ -536,7 +542,7 @@ namespace N_m3u8DL_RE.Common.Resource
                       "-sa lang=en:for=best\r\n" +
                       "# 选择最佳的2条英语(或日语)音轨\r\n" +
                       "-sa lang=\"ja|en\":for=best2\r\n" +
-                      "-sa role=\"main\":for:best\r\n",
+                      "-sa role=\"main\":for=best\r\n",
                 zhTW: "通過正則表達式選擇符合要求的音軌. 參考 --select-video\r\n\r\n" +
                       "例如: \r\n" +
                       "# 選擇所有音訊\r\n" +
@@ -545,7 +551,7 @@ namespace N_m3u8DL_RE.Common.Resource
                       "-sa lang=en:for=best\r\n" +
                       "# 選擇最佳的2條英語(或日語)音軌\r\n" +
                       "-sa lang=\"ja|en\":for=best2\r\n" +
-                      "-sa role=\"main\":for:best\r\n",
+                      "-sa role=\"main\":for=best\r\n",
                 enUS: "Select audio streams by regular expressions. ref --select-video\r\n\r\n" +
                       "Examples: \r\n" +
                       "# select all\r\n" +
@@ -554,7 +560,7 @@ namespace N_m3u8DL_RE.Common.Resource
                       "-sa lang=en:for=best\r\n" +
                       "# select best 2, and language is ja or en\r\n" +
                       "-sa lang=\"ja|en\":for=best2\r\n" +
-                      "-sa role=\"main\":for:best\r\n"
+                      "-sa role=\"main\":for=best\r\n"
             ),
             ["cmd_selectSubtitle"] = new TextContainer
             (

src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs

@@ -369,6 +369,14 @@ namespace N_m3u8DL_RE.CommandLine
             if (!string.IsNullOrEmpty(plistDurMax))
                 streamFilter.PlaylistMaxDur = OtherUtil.ParseSeconds(plistDurMax);
 
+            var bwMin = p.GetValue("bwMin");
+            if (!string.IsNullOrEmpty(bwMin))
+                streamFilter.BandwidthMin = int.Parse(bwMin) * 1000;
+
+            var bwMax = p.GetValue("bwMax");
+            if (!string.IsNullOrEmpty(bwMax))
+                streamFilter.BandwidthMax = int.Parse(bwMax) * 1000;
+
             var role = p.GetValue("role");
             if (System.Enum.TryParse(role, true, out RoleType roleType))
                 streamFilter.Role = roleType;
@@ -566,7 +574,7 @@ namespace N_m3u8DL_RE.CommandLine
                     option.MuxAfterDone = true;
                     option.MuxOptions = muxAfterDoneValue;
                     if (muxAfterDoneValue.UseMkvmerge) option.MkvmergeBinaryPath = muxAfterDoneValue.BinPath;
-                    else option.FFmpegBinaryPath = muxAfterDoneValue.BinPath;
+                    else option.FFmpegBinaryPath ??= muxAfterDoneValue.BinPath;
                 }
 
 

src/N_m3u8DL-RE/Entity/StreamFilter.cs

@@ -23,6 +23,8 @@ namespace N_m3u8DL_RE.Entity
         public long? SegmentsMaxCount { get; set; }
         public double? PlaylistMinDur {  get; set; }
         public double? PlaylistMaxDur {  get; set; }
+        public int? BandwidthMin { get; set; }
+        public int? BandwidthMax { get; set; }
         public RoleType? Role { get; set; }
 
         public string For { get; set; } = "best";
@@ -44,6 +46,8 @@ namespace N_m3u8DL_RE.Entity
             if (SegmentsMaxCount != null) sb.Append($"SegmentsMaxCount: {SegmentsMaxCount} ");
             if (PlaylistMinDur != null) sb.Append($"PlaylistMinDur: {PlaylistMinDur} ");
             if (PlaylistMaxDur != null) sb.Append($"PlaylistMaxDur: {PlaylistMaxDur} ");
+            if (BandwidthMin != null) sb.Append($"{nameof(BandwidthMin)}: {BandwidthMin} ");
+            if (BandwidthMax != null) sb.Append($"{nameof(BandwidthMax)}: {BandwidthMax} ");
             if (Role.HasValue) sb.Append($"Role: {Role} ");
 
             return sb.ToString() + $"For: {For}";

src/N_m3u8DL-RE/Util/FilterUtil.cs

@@ -46,6 +46,10 @@ namespace N_m3u8DL_RE.Util
                 inputs = inputs.Where(i => i.Playlist?.TotalDuration > filter.PlaylistMinDur);
             if (filter.PlaylistMaxDur != null)
                 inputs = inputs.Where(i => i.Playlist?.TotalDuration < filter.PlaylistMaxDur);
+            if (filter.BandwidthMin != null)
+                inputs = inputs.Where(i => i.Bandwidth >= filter.BandwidthMin);
+            if (filter.BandwidthMax != null)
+                inputs = inputs.Where(i => i.Bandwidth <= filter.BandwidthMax);
             if (filter.Role.HasValue)
                 inputs = inputs.Where(i => i.Role == filter.Role);