Updates

src/Fragalytics.RenderWorker/Services/SampleCopyRenderBackend.cs

@@ -13,7 +13,7 @@ public sealed class SampleCopyRenderBackend : IClipRenderBackend
         _options = options.Value;
     }
 
-    public string Name => "sample-copy";
+    public string Name => RenderBackendNames.SampleCopy;
 
     public async Task<RenderedClipResult> RenderAsync(ClipJobRecord clipJob, CancellationToken cancellationToken)
     {
@@ -42,7 +42,7 @@ public sealed class SampleCopyRenderBackend : IClipRenderBackend
         {
             FilePath = outputPath,
             FileName = Path.GetFileName(sampleClipPath),
-            ContentType = extension.Equals(".webm", StringComparison.OrdinalIgnoreCase) ? "video/webm" : "video/mp4"
+            ContentType = ClipMediaFormats.InferContentType(extension)
         };
     }
 }