add hls segmenter streaming mode (#400)

* hls segmenter wip

* log message

* close unused transcode sessions after 2 minutes

* use frame rate for 2s keyframes in hls segmenter

* add frame rate to media version

* fix segmenter framerate calculation

* automatically restart hls segmenter with next scheduled item

* cleanup

* update changelog

* decrease segmenter start delay

ErsatzTV.Infrastructure/Migrations/20211007201223_Add_MediaVersionRFrameRate.cs

@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_MediaVersionRFrameRate : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "RFrameRate",
+                table: "MediaVersion",
+                type: "TEXT",
+                nullable: true);
+            
+            migrationBuilder.Sql("UPDATE MediaVersion SET DateUpdated = '0001-01-01 00:00:00'");
+            migrationBuilder.Sql("UPDATE LibraryFolder SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE EmbyMovie SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE EmbyShow SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE EmbySeason SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE EmbyEpisode SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE JellyfinMovie SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE JellyfinShow SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE JellyfinSeason SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE JellyfinEpisode SET Etag = NULL");
+            migrationBuilder.Sql("UPDATE LibraryPath SET LastScan = '0001-01-01 00:00:00'");
+            migrationBuilder.Sql("UPDATE Library SET LastScan = '0001-01-01 00:00:00'");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "RFrameRate",
+                table: "MediaVersion");
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -809,6 +809,9 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Property<string>("Name")
                         .HasColumnType("TEXT");
 
+                    b.Property<string>("RFrameRate")
+                        .HasColumnType("TEXT");
+
                     b.Property<string>("SampleAspectRatio")
                         .HasColumnType("TEXT");