get thumbnail from attached pic if present

src/util/video.ts

@@ -58,20 +58,45 @@ export async function resolveVideo(name: string): Promise<ResolvedVideo | null>
   return null;
 }
 
-export interface VideoMetadata {
-  title: string;
-  description: string | null;
-  longDescription: string | null;
-}
 interface FFprobeResult {
   streams?: {
+    index?: number;
     codec_type?: string;
     tags?: Record<string, string>;
+    disposition?: {
+      attached_pic?: number;
+    };
   }[];
   format?: {
     tags?: Record<string, string>;
   };
 }
+async function getVideoFFprobeMetadata(filePath: string): Promise<FFprobeResult | null> {
+  try {
+    const { stdout } = await execFileAsync(
+      'ffprobe',
+      // prettier-ignore
+      [
+        '-v', 'error',
+        '-show_entries', 'format_tags=title,description,synopsis,longdescription:stream=index,codec_type:stream_tags=title,description,synopsis,longdescription:stream_disposition=attached_pic',
+        '-of', 'json',
+        filePath
+      ],
+      { timeout: 20_000, maxBuffer: 1024 * 1024 }
+    );
+
+    return JSON.parse(stdout) as FFprobeResult;
+  } catch (e) {
+    logger.warn({ error: e instanceof Error ? e.message : String(e) }, 'error while reading video metadata');
+    return null;
+  }
+}
+
+export interface VideoMetadata {
+  title: string;
+  description: string | null;
+  longDescription: string | null;
+}
 export async function getVideoMetadata(video: ResolvedVideo): Promise<VideoMetadata | null> {
   const modifiedAtMs = video.modifiedAt.getTime();
   const cached = videoMetadataCache.get(video.path);
@@ -82,26 +107,16 @@ export async function getVideoMetadata(video: ResolvedVideo): Promise<VideoMetad
 
   let metadata: VideoMetadata;
   try {
-    const { stdout } = await execFileAsync(
-      'ffprobe',
-      // prettier-ignore
-      [
-        '-v', 'error',
-        '-show_entries', 'format_tags=title,description,synopsis,longdescription:stream=codec_type:stream_tags=title,description,synopsis,longdescription',
-        '-of', 'json',
-        video.path
-      ],
-      { timeout: 20_000, maxBuffer: 1024 * 1024 }
-    );
+    const probe = await getVideoFFprobeMetadata(video.path);
+    if (!probe) return null;
 
-    const parsed = JSON.parse(stdout) as FFprobeResult;
-    const videoStream = parsed.streams?.find((stream) => stream.codec_type === 'video');
-    const tags = { ...videoStream?.tags, ...parsed.format?.tags };
+    const videoStream = probe.streams?.find((stream) => stream.codec_type === 'video');
+    const tags = { ...videoStream?.tags, ...probe.format?.tags };
 
     metadata = {
       title: tags['title'] || video.name,
       description: tags['description'],
-      longDescription: tags['synopsis'],
+      longDescription: tags['synopsis']
     };
   } catch (e) {
     logger.warn({ error: e instanceof Error ? e.message : String(e) }, 'error while reading video metadata');
@@ -125,14 +140,14 @@ export async function getVideoThumbnail(video: ResolvedVideo): Promise<VideoThum
   if (!VIDEO_PATH) return null;
 
   const cacheDirectory = path.join(path.resolve(CACHE_PATH), '.thumbnails');
-  const cacheKey = createHash('sha1').update(`${video.path}:${video.size}:${video.modifiedAt.getTime()}`).digest('hex');
+  const cacheKey = createHash('sha1')
+    .update(`cover:${video.path}:${video.size}:${video.modifiedAt.getTime()}`)
+    .digest('hex');
   const thumbnailPath = path.join(cacheDirectory, `${cacheKey}.jpg`);
 
   try {
     const stats = await fs.promises.stat(thumbnailPath);
-    if (stats.isFile() && stats.size > 0) {
-      return { path: thumbnailPath, contentType: 'image/jpeg' };
-    }
+    if (stats.isFile()) return { path: thumbnailPath, contentType: 'image/jpeg' };
   } catch (e) {
     if ((e as NodeJS.ErrnoException).code !== 'ENOENT') {
       logger.warn({ error: (e as Error).message }, 'error while reading video thumbnail');
@@ -143,6 +158,11 @@ export async function getVideoThumbnail(video: ResolvedVideo): Promise<VideoThum
 
   try {
     await fs.promises.mkdir(cacheDirectory, { recursive: true });
+
+    const probe = await getVideoFFprobeMetadata(video.path);
+    const coverIndex = probe?.streams?.find((stream) => stream.disposition?.attached_pic === 1)?.index ?? null;
+
+    // extract embedded cover or first frame
     await execFileAsync(
       'ffmpeg',
       // prettier-ignore
@@ -150,10 +170,11 @@ export async function getVideoThumbnail(video: ResolvedVideo): Promise<VideoThum
         '-v', 'error',
         '-y',
         '-i', video.path,
+        ...(coverIndex !== null ? ['-map', `0:${coverIndex}`] : []),
         '-frames:v', '1',
         '-vf', 'scale=1280:-2',
         '-q:v', '2',
-        tempPath
+        tempPath,
       ],
       { timeout: 20_000, maxBuffer: 1024 * 1024 }
     );