fix: use configured ffmpeg with all graphics elements (#2892)

CHANGELOG.md

@@ -14,6 +14,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 - Fix HLS Direct playback when JWT auth is also used
+- Use configured ffmpeg path for motion and subtitle graphics elements
+  - Previously, these elements required ffmpeg to be on PATH
 
 ## [26.5.1] - 2026-05-08
 ### Fixed

ErsatzTV.Infrastructure/Streaming/Graphics/GraphicsEngine.cs

@@ -27,6 +27,10 @@ public class GraphicsEngine(
             ConfigElementKey.FFprobePath,
             cancellationToken);
 
+        Option<string> ffmpegPath = await configElementRepository.GetValue<string>(
+            ConfigElementKey.FFmpegPath,
+            cancellationToken);
+
         var elements = new List<IGraphicsElement>();
         foreach (GraphicsElementContext element in context.Elements)
         {
@@ -54,6 +58,7 @@ public class GraphicsEngine(
                         new MotionElement(
                             motionElementDataContext.MotionElement,
                             ffprobePath,
+                            ffmpegPath,
                             localStatisticsProvider,
                             logger));
                     break;
@@ -74,6 +79,7 @@ public class GraphicsEngine(
                         templateFunctions,
                         tempFilePool,
                         subtitleElementContext.SubtitleElement,
+                        ffmpegPath,
                         variables,
                         logger);
 

ErsatzTV.Infrastructure/Streaming/Graphics/Motion/MotionElement.cs

@@ -15,6 +15,7 @@ namespace ErsatzTV.Infrastructure.Streaming.Graphics;
 public class MotionElement(
     MotionGraphicsElement motionElement,
     Option<string> ffprobePath,
+    Option<string> ffmpegPath,
     ILocalStatisticsProvider localStatisticsProvider,
     ILogger logger)
     : GraphicsElement, IDisposable
@@ -193,7 +194,7 @@ public class MotionElement(
 
             _state = MotionElementState.PlayingIn;
 
-            Command command = Cli.Wrap("ffmpeg")
+            Command command = Cli.Wrap(await ffmpegPath.IfNoneAsync("ffmpeg"))
                 .WithArguments(arguments)
                 .WithWorkingDirectory(FileSystemLayout.TempFilePoolFolder)
                 .WithStandardOutputPipe(PipeTarget.ToStream(pipe.Writer.AsStream()));

ErsatzTV.Infrastructure/Streaming/Graphics/Subtitle/SubtitleElement.cs

@@ -18,6 +18,7 @@ public class SubtitleElement(
     TemplateFunctions templateFunctions,
     ITempFilePool tempFilePool,
     SubtitleGraphicsElement subtitleElement,
+    Option<string> ffmpegPath,
     Dictionary<string, object> variables,
     ILogger logger)
     : GraphicsElement, IDisposable
@@ -114,7 +115,7 @@ public class SubtitleElement(
                 "-"
             ];
 
-            Command command = Cli.Wrap("ffmpeg")
+            Command command = Cli.Wrap(await ffmpegPath.IfNoneAsync("ffmpeg"))
                 .WithArguments(arguments)
                 .WithWorkingDirectory(FileSystemLayout.TempFilePoolFolder)
                 .WithStandardOutputPipe(PipeTarget.ToStream(pipe.Writer.AsStream()));