ff

tests/unit/test_media_descriptor_change_set.py

@@ -27,6 +27,64 @@ class StaticConfig:
 
 
 class MediaDescriptorChangeSetTests(unittest.TestCase):
+    def test_non_primary_source_language_code_is_normalized_in_changed_track_metadata(self):
+        context = {
+            "logger": get_ffx_logger(),
+            "config": StaticConfig({}),
+        }
+
+        source_track = TrackDescriptor(
+            index=0,
+            source_index=0,
+            sub_index=0,
+            track_type=TrackType.AUDIO,
+            tags={"language": "ger", "title": "German Main"},
+        )
+        target_track = TrackDescriptor(
+            index=0,
+            source_index=0,
+            sub_index=0,
+            track_type=TrackType.AUDIO,
+            tags={"language": "ger", "title": "German Main"},
+        )
+
+        change_set = MediaDescriptorChangeSet(
+            context,
+            MediaDescriptor(track_descriptors=[target_track]),
+            MediaDescriptor(track_descriptors=[source_track]),
+        )
+
+        metadata_tokens = change_set.generateMetadataTokens()
+
+        self.assertIn("-metadata:s:a:0", metadata_tokens)
+        self.assertIn("language=deu", metadata_tokens)
+        self.assertNotIn("language=ger", metadata_tokens)
+
+    def test_target_only_track_language_metadata_uses_primary_code(self):
+        context = {
+            "logger": get_ffx_logger(),
+            "config": StaticConfig({}),
+        }
+
+        target_track = TrackDescriptor(
+            index=0,
+            source_index=0,
+            sub_index=0,
+            track_type=TrackType.AUDIO,
+            tags={"language": "ger", "title": "German Main"},
+        )
+
+        change_set = MediaDescriptorChangeSet(
+            context,
+            MediaDescriptor(track_descriptors=[target_track]),
+        )
+
+        metadata_tokens = change_set.generateMetadataTokens()
+
+        self.assertIn("-metadata:s:a:0", metadata_tokens)
+        self.assertIn("language=deu", metadata_tokens)
+        self.assertNotIn("language=ger", metadata_tokens)
+
     def test_external_subtitle_preserves_source_only_tags_except_removed_keys(self):
         context = {
             "logger": get_ffx_logger(),
@@ -79,6 +137,40 @@ class MediaDescriptorChangeSetTests(unittest.TestCase):
         self.assertNotIn("BPS=remove-me", metadata_tokens)
         self.assertIn("BPS=", metadata_tokens)
 
+    def test_external_subtitle_normalizes_preserved_source_language_metadata(self):
+        context = {
+            "logger": get_ffx_logger(),
+            "config": StaticConfig({}),
+        }
+
+        source_track = TrackDescriptor(
+            index=0,
+            source_index=0,
+            sub_index=0,
+            track_type=TrackType.SUBTITLE,
+            tags={"language": "ger", "title": "German Subtitle"},
+        )
+        target_track = TrackDescriptor(
+            index=0,
+            source_index=0,
+            sub_index=0,
+            track_type=TrackType.SUBTITLE,
+            tags={},
+            external_source_file="/tmp/external-subtitle.vtt",
+        )
+
+        change_set = MediaDescriptorChangeSet(
+            context,
+            MediaDescriptor(track_descriptors=[target_track]),
+            MediaDescriptor(track_descriptors=[source_track]),
+        )
+
+        metadata_tokens = change_set.generateMetadataTokens()
+
+        self.assertIn("-metadata:s:s:0", metadata_tokens)
+        self.assertIn("language=deu", metadata_tokens)
+        self.assertNotIn("language=ger", metadata_tokens)
+
     def test_target_only_tracks_still_emit_remove_tokens_for_configured_stream_keys(self):
         context = {
             "logger": get_ffx_logger(),