diff --git a/src/lib.rs b/src/lib.rs
index 11ebf4c..e4f8066 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -149,7 +149,7 @@ enum Stream {
         codec_long_name: String,
         coded_height: usize,
         coded_width: usize,
-        display_aspect_ratio: String,
+        display_aspect_ratio: Option<String>,
         #[serde(default, deserialize_with = "from_str")]
         duration: f32,
         height: usize,
@@ -376,7 +376,10 @@ impl Movies {
         let mut movie_counter = HashMap::new();
         for m in &self.movies {
             let (path, _cmd) = m.files.first().unwrap();
-            let parent = clean_path_parent(path).to_string_lossy().to_string();
+            let parent = clean_path_parent(path)
+                .to_string_lossy()
+                .to_ascii_lowercase()
+                .to_string();
             movie_counter.entry(parent).or_insert(Vec::new()).push(m);
         }
         let mut dupes = Vec::new();
diff --git a/src/movielibrary_test.rs b/src/movielibrary_test.rs
index f784a8c..757615d 100644
--- a/src/movielibrary_test.rs
+++ b/src/movielibrary_test.rs
@@ -37,7 +37,7 @@ fn test_simple_library() {
                             short_name: "mp3".to_string(),
                             long_name: "MP3 (MPEG audio layer 3)".to_string(),
                             channels: 2,
-                            channel_layout: "stereo".to_string(),
+                            channel_layout: Some("stereo".to_string()),
                             title: None,
                             language: None,
                         }],
@@ -116,6 +116,16 @@ fn build_complex_metadata() -> HashMap<String, CompactMetadata> {
             (1920, 1080),
             5000,
         ),
+        build_tuple(
+            "two movies different caps (2019)/abcdef123456789.mkv",
+            (1920, 1080),
+            100,
+        ),
+        build_tuple(
+            "Two Movies Different Caps (2019)/abcdef123456789.mkv",
+            (640, 480),
+            1,
+        ),
     ]
     .into_iter()
     .collect()
@@ -158,6 +168,16 @@ fn build_complex_movies() -> Movies {
                 (1920, 1080),
                 5000,
             )]),
+            build_movie(vec![(
+                "two movies different caps (2019)/abcdef123456789.mkv",
+                (1920, 1080),
+                100,
+            )]),
+            build_movie(vec![(
+                "Two Movies Different Caps (2019)/abcdef123456789.mkv",
+                (640, 480),
+                1,
+            )]),
         ],
     };
     m.movies.sort_by(|a, b| {
@@ -200,25 +220,39 @@ fn validate_duplicates(got: Vec<(&Movie, Vec<&Movie>)>, want: Vec<(Movie, Vec<Mo
 fn test_duplicate_candidates() -> Result<(), Box<dyn Error>> {
     let movies = build_complex_movies();
     let got = movies.duplicate_candidates();
-    let want = vec![(
-        build_movie(vec![(
-            "Two Movies With Multi Parts (2019)/somethingelse.mkv",
-            (1920, 1080),
-            5000,
-        )]),
-        vec![build_movie(vec![
-            (
-                "Two Movies With Multi Parts (2019)/abcdef123456789 part 1.mkv",
-                (1280, 720),
-                1000,
-            ),
-            (
-                "Two Movies With Multi Parts (2019)/abcdef123456789 part 2.mkv",
-                (1280, 720),
-                1000,
-            ),
-        ])],
-    )];
+    let want = vec![
+        (
+            build_movie(vec![(
+                "Two Movies With Multi Parts (2019)/somethingelse.mkv",
+                (1920, 1080),
+                5000,
+            )]),
+            vec![build_movie(vec![
+                (
+                    "Two Movies With Multi Parts (2019)/abcdef123456789 part 1.mkv",
+                    (1280, 720),
+                    1000,
+                ),
+                (
+                    "Two Movies With Multi Parts (2019)/abcdef123456789 part 2.mkv",
+                    (1280, 720),
+                    1000,
+                ),
+            ])],
+        ),
+        (
+            build_movie(vec![(
+                "two movies different caps (2019)/abcdef123456789.mkv",
+                (1920, 1080),
+                100,
+            )]),
+            vec![build_movie(vec![(
+                "Two Movies Different Caps (2019)/abcdef123456789.mkv",
+                (640, 480),
+                1,
+            )])],
+        ),
+    ];
     validate_duplicates(got, want);
     Ok(())
 }