diff --git a/homeassistant/components/camera/media_source.py b/homeassistant/components/camera/media_source.py
index c61cbef146a..ab7661fefe2 100644
--- a/homeassistant/components/camera/media_source.py
+++ b/homeassistant/components/camera/media_source.py
@@ -81,11 +81,13 @@ class CameraMediaSource(MediaSource):
         # Root. List cameras.
         component: EntityComponent = self.hass.data[DOMAIN]
         children = []
+        not_shown = 0
         for camera in component.entities:
             camera = cast(Camera, camera)
             stream_type = camera.frontend_stream_type
 
             if stream_type not in supported_stream_types:
+                not_shown += 1
                 continue
 
             children.append(
@@ -111,4 +113,5 @@ class CameraMediaSource(MediaSource):
             can_expand=True,
             children_media_class=MEDIA_CLASS_VIDEO,
             children=children,
+            not_shown=not_shown,
         )
diff --git a/homeassistant/components/media_source/__init__.py b/homeassistant/components/media_source/__init__.py
index 2bcd80a39ab..3c42016f8f7 100644
--- a/homeassistant/components/media_source/__init__.py
+++ b/homeassistant/components/media_source/__init__.py
@@ -119,7 +119,7 @@ async def async_browse_media(
     item.children = [
         child for child in item.children if child.can_expand or content_filter(child)
     ]
-    item.not_shown = old_count - len(item.children)
+    item.not_shown += old_count - len(item.children)
     return item
 
 
diff --git a/tests/components/camera/test_media_source.py b/tests/components/camera/test_media_source.py
index 3a3558419e5..54d6ef6279e 100644
--- a/tests/components/camera/test_media_source.py
+++ b/tests/components/camera/test_media_source.py
@@ -35,6 +35,7 @@ async def test_browsing_filter_non_hls(hass, mock_camera_web_rtc):
     assert item is not None
     assert item.title == "Camera"
     assert len(item.children) == 0
+    assert item.not_shown == 2
 
 
 async def test_resolving(hass, mock_camera_hls):
diff --git a/tests/components/media_source/test_init.py b/tests/components/media_source/test_init.py
index 2655000efc9..491b1972cb6 100644
--- a/tests/components/media_source/test_init.py
+++ b/tests/components/media_source/test_init.py
@@ -6,7 +6,7 @@ import yarl
 
 from homeassistant.components import media_source
 from homeassistant.components.media_player import MEDIA_CLASS_DIRECTORY, BrowseError
-from homeassistant.components.media_source import const
+from homeassistant.components.media_source import const, models
 from homeassistant.setup import async_setup_component
 
 
@@ -60,6 +60,30 @@ async def test_async_browse_media(hass):
     media.children[0].title = "Epic Sax Guy 10 Hours"
     assert media.not_shown == 1
 
+    # Test content filter adds to original not_shown
+    orig_browse = models.MediaSourceItem.async_browse
+
+    async def not_shown_browse(self):
+        """Patch browsed item to set not_shown base value."""
+        item = await orig_browse(self)
+        item.not_shown = 10
+        return item
+
+    with patch(
+        "homeassistant.components.media_source.models.MediaSourceItem.async_browse",
+        not_shown_browse,
+    ):
+        media = await media_source.async_browse_media(
+            hass,
+            "",
+            content_filter=lambda item: item.media_content_type.startswith("video/"),
+        )
+    assert isinstance(media, media_source.models.BrowseMediaSource)
+    assert media.title == "media"
+    assert len(media.children) == 1, media.children
+    media.children[0].title = "Epic Sax Guy 10 Hours"
+    assert media.not_shown == 11
+
     # Test invalid media content
     with pytest.raises(BrowseError):
         await media_source.async_browse_media(hass, "invalid")