fix: fix next playout building (#2855)

ErsatzTV.Application/Channels/Commands/UpdateChannelHandler.cs

@@ -1,6 +1,7 @@
 using System.Globalization;
 using System.Text.RegularExpressions;
 using System.Threading.Channels;
+using ErsatzTV.Application.Playouts;
 using ErsatzTV.Application.Subtitles;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -160,6 +161,7 @@ public class UpdateChannelHandler(
         if (hasEpgChange)
         {
             await workerChannel.WriteAsync(new RefreshChannelData(c.Number), cancellationToken);
+            await workerChannel.WriteAsync(new SyncNextPlayout(c.Number), cancellationToken);
         }
 
         return ProjectToViewModel(c, c.Playouts?.Count ?? 0);

ErsatzTV.Application/Playouts/Commands/SyncNextPlayoutHandler.cs

@@ -7,6 +7,7 @@ using ErsatzTV.Core.Extensions;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Next;
 using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Infrastructure.Extensions;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 
@@ -78,6 +79,22 @@ public partial class SyncNextPlayoutHandler(
     {
         await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
 
+        TimeSpan playoutOffset = TimeSpan.Zero;
+        string mirrorChannelNumber = null;
+        Option<Channel> maybeChannel = await dbContext.Channels
+            .AsNoTracking()
+            .Include(c => c.MirrorSourceChannel)
+            .Filter(c => c.PlayoutSource == ChannelPlayoutSource.Mirror && c.MirrorSourceChannelId != null)
+            .SelectOneAsync(
+                c => c.Number == channelNumber,
+                c => c.Number == channelNumber,
+                cancellationToken);
+        foreach (Channel channel in maybeChannel)
+        {
+            mirrorChannelNumber = channel.MirrorSourceChannel.Number;
+            playoutOffset = channel.PlayoutOffset ?? TimeSpan.Zero;
+        }
+
         List<int> localLibraryIds = await dbContext.LocalLibraries
             .AsNoTracking()
             .Map(l => l.Id)
@@ -85,7 +102,7 @@ public partial class SyncNextPlayoutHandler(
 
         List<PlayoutItem> playoutItems = await dbContext.PlayoutItems
             .AsNoTracking()
-            .Where(i => i.Playout.Channel.Number == channelNumber)
+            .Where(i => i.Playout.Channel.Number == (mirrorChannelNumber ?? channelNumber))
             .Where(i => localLibraryIds.Contains(i.MediaItem.LibraryPath.LibraryId))
             .Include(i => i.MediaItem)
             .ThenInclude(i => (i as Episode).MediaVersions)
@@ -124,6 +141,9 @@ public partial class SyncNextPlayoutHandler(
 
                 string path = playoutItem.MediaItem.GetHeadVersion().MediaFiles.Head().Path;
 
+                playoutItem.Start += playoutOffset;
+                playoutItem.Finish += playoutOffset;
+
                 var nextPlayoutItem = new ItemElement
                 {
                     Id = playoutItem.Id.ToString(CultureInfo.InvariantCulture),

ErsatzTV.Application/Streaming/Commands/StartFFmpegNextSessionHandler.cs

@@ -142,9 +142,17 @@ public class StartFFmpegNextSessionHandler(
 
     private Task<Validation<BaseError, ValidationResult>> ChannelBinaryMustExist()
     {
-        string nextFolder = string.IsNullOrWhiteSpace(SystemEnvironment.NextFolder)
-            ? fileSystem.Path.GetDirectoryName(Assembly.GetEntryAssembly()?.Location)
-            : SystemEnvironment.NextFolder;
+        string nextFolder = SystemEnvironment.NextFolder;
+        if (string.IsNullOrWhiteSpace(nextFolder))
+        {
+            string processFileName = Environment.ProcessPath ?? string.Empty;
+            string processExecutable = Path.GetFileNameWithoutExtension(processFileName);
+            nextFolder = Path.GetDirectoryName(processFileName);
+            if ("dotnet".Equals(processExecutable, StringComparison.OrdinalIgnoreCase))
+            {
+                nextFolder = AppContext.BaseDirectory;
+            }
+        }
 
         string executable = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
             ? "ersatztv-channel.exe"