diff --git a/src/components/mixed/MixedView.tsx b/src/components/mixed/MixedView.tsx
index 783bfe4..7f6e9b6 100644
--- a/src/components/mixed/MixedView.tsx
+++ b/src/components/mixed/MixedView.tsx
@@ -7,6 +7,7 @@ import ImageLightbox from './ImageLightbox'
 import TagSelector from '@/components/tags/TagSelector'
 import FilterPanel from '@/components/FilterPanel'
 import DoomScrollView, { type DoomScrollItem } from '@/components/DoomScrollView'
+import { isBrowserPlayable } from '@/lib/browser-media'
 
 interface Props {
   libraryId: string
@@ -200,7 +201,7 @@ export default function MixedView({ libraryId, initialPath }: Props) {
   // When filters are active, doom scroll uses filteredEntries (already filtered by search/tags).
   // When no filters, doom scroll uses the full recursiveEntries.
   const doomScrollItems: DoomScrollItem[] = (filtersActive ? filteredEntries : recursiveEntries)
-    .filter((e) => e.type === 'file' && (e.mediaType === 'video' || e.mediaType === 'image') && e.url)
+    .filter((e) => e.type === 'file' && (e.mediaType === 'video' || e.mediaType === 'image') && e.url && isBrowserPlayable(e.name))
     .map((e) => ({ url: e.url!, name: e.name, mediaType: e.mediaType as 'video' | 'image' }))
 
   return (
diff --git a/src/components/movies/MoviesView.tsx b/src/components/movies/MoviesView.tsx
index bb28d68..cc446d1 100644
--- a/src/components/movies/MoviesView.tsx
+++ b/src/components/movies/MoviesView.tsx
@@ -5,6 +5,7 @@ import type { Movie } from '@/types'
 import MovieDetailModal from './MovieDetailModal'
 import FilterPanel from '@/components/FilterPanel'
 import DoomScrollView, { type DoomScrollItem } from '@/components/DoomScrollView'
+import { isBrowserPlayable } from '@/lib/browser-media'
 
 interface Props {
   libraryId: string
@@ -74,7 +75,7 @@ export default function MoviesView({ libraryId }: Props) {
 
   const handleDoomScroll = () => {
     // Use filtered movies — respects any active search/tag filters automatically
-    const items: DoomScrollItem[] = filtered.map((m) => ({
+    const items: DoomScrollItem[] = filtered.filter((m) => isBrowserPlayable(m.videoPath)).map((m) => ({
       url: `/api/file?libraryId=${encodeURIComponent(libraryId)}&path=${encodeURIComponent(m.videoPath)}`,
       name: m.title,
       mediaType: 'video' as const,
diff --git a/src/components/tv/TvView.tsx b/src/components/tv/TvView.tsx
index 87cfafe..9a95816 100644
--- a/src/components/tv/TvView.tsx
+++ b/src/components/tv/TvView.tsx
@@ -8,6 +8,7 @@ import VideoPlayerModal from '@/components/mixed/VideoPlayerModal'
 import TagSelector from '@/components/tags/TagSelector'
 import EpisodeCard from './EpisodeCard'
 import DoomScrollView, { type DoomScrollItem } from '@/components/DoomScrollView'
+import { isBrowserPlayable } from '@/lib/browser-media'
 
 interface Props {
   libraryId: string
@@ -184,7 +185,7 @@ export default function TvView({ libraryId }: Props) {
             return seasonEps.flat()
           })
         )
-        items = episodeLists.flat().map((ep) => ({
+        items = episodeLists.flat().filter((ep) => isBrowserPlayable(ep.videoPath)).map((ep) => ({
           url: `/api/file?libraryId=${encodeURIComponent(libraryId)}&path=${encodeURIComponent(ep.videoPath)}`,
           name: ep.title,
           mediaType: 'video' as const,
@@ -209,7 +210,7 @@ export default function TvView({ libraryId }: Props) {
             return seasonEps.flat()
           })
         )
-        items = episodeLists.flat().map((ep) => ({
+        items = episodeLists.flat().filter((ep) => isBrowserPlayable(ep.videoPath)).map((ep) => ({
           url: `/api/file?libraryId=${encodeURIComponent(libraryId)}&path=${encodeURIComponent(ep.videoPath)}`,
           name: ep.title,
           mediaType: 'video' as const,
diff --git a/src/lib/browser-media.ts b/src/lib/browser-media.ts
new file mode 100644
index 0000000..99d87cb
--- /dev/null
+++ b/src/lib/browser-media.ts
@@ -0,0 +1,19 @@
+/**
+ * Browser-native media formats safe for use in <video> and <img> elements.
+ * Kept separate from the broader scanner extension sets (media-utils.ts, files.ts)
+ * which include server-side-only formats like .mkv, .avi, .tiff, etc.
+ */
+
+export const BROWSER_VIDEO_EXTENSIONS = new Set(['.mp4', '.webm', '.mov', '.m4v'])
+export const BROWSER_IMAGE_EXTENSIONS = new Set(['.jpg', '.jpeg', '.png', '.gif', '.webp', '.bmp'])
+
+/**
+ * Returns true if the file at `filename` (or path) has a browser-playable extension.
+ * Uses lastIndexOf to avoid importing the Node `path` module in client components.
+ */
+export function isBrowserPlayable(filename: string): boolean {
+  const dot = filename.lastIndexOf('.')
+  if (dot === -1) return false
+  const ext = filename.slice(dot).toLowerCase()
+  return BROWSER_VIDEO_EXTENSIONS.has(ext) || BROWSER_IMAGE_EXTENSIONS.has(ext)
+}