2 files changed, 15 insertions, 2 deletions
diff --git a/activestorage/lib/active_storage/previewer/pdf_previewer.rb b/activestorage/lib/active_storage/previewer/pdf_previewer.rb
index a2f05c74a6..426ff51eb1 100644
--- a/activestorage/lib/active_storage/previewer/pdf_previewer.rb
+++ b/activestorage/lib/active_storage/previewer/pdf_previewer.rb
@@ -8,10 +8,19 @@ module ActiveStorage
 
     def preview
       download_blob_to_tempfile do |input|
-        draw "mutool", "draw", "-F", "png", "-o", "-", input.path, "1" do |output|
+        draw_first_page_from input do |output|
           yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png"
         end
       end
     end
+
+    private
+      def draw_first_page_from(file, &block)
+        draw mutool_path, "draw", "-F", "png", "-o", "-", file.path, "1", &block
+      end
+
+      def mutool_path
+        ActiveStorage.paths[:mutool] || "mutool"
+      end
   end
 end
diff --git a/activestorage/lib/active_storage/previewer/video_previewer.rb b/activestorage/lib/active_storage/previewer/video_previewer.rb
index 49f128d142..2f28a3d341 100644
--- a/activestorage/lib/active_storage/previewer/video_previewer.rb
+++ b/activestorage/lib/active_storage/previewer/video_previewer.rb
@@ -16,8 +16,12 @@ module ActiveStorage
 
     private
       def draw_relevant_frame_from(file, &block)
-        draw "ffmpeg", "-i", file.path, "-y", "-vcodec", "png",
+        draw ffmpeg_path, "-i", file.path, "-y", "-vcodec", "png",
           "-vf", "thumbnail", "-vframes", "1", "-f", "image2", "-", &block
       end
+
+      def ffmpeg_path
+        ActiveStorage.paths[:ffmpeg] || "ffmpeg"
+      end
   end
 end