Capture YouTube titles from Discord's embed cache

media-scrape/src/engine.ts

@@ -100,6 +100,14 @@ export interface ScrapeEngineOptions {
     ) => Promise<string | null>;
     /** Delay before the single suspect retry. Default 50 s. */
     suspectRetryMs?: number;
+    /**
+     * Title and author from the source message's Discord embed. Preferred over the provider
+     * oEmbed: Discord keeps the embed data even after a video is deleted.
+     */
+    embedMeta?: (
+        scrapeId: string,
+        media: { id: number; url: string; playUrl: string | null }
+    ) => Promise<{ title: string; author: string | null } | null>;
     /** Read dimensions and duration from a downloaded file. Defaults to ffprobe. */
     probe?: (
         path: string
@@ -605,7 +613,15 @@ export class ScrapeEngine {
                     break;
                 }
 
-                const resolved = await resolveEmbedTitle(row.url, options);
+                // Discord's cached embed data survives a deleted video; ask it first.
+                const fromDiscord = await this.options.embedMeta?.(meta.id, {
+                    id: row.id,
+                    url: row.url,
+                    playUrl: row.play_url
+                });
+                const resolved =
+                    fromDiscord ??
+                    (await resolveEmbedTitle(row.url, options));
                 if (resolved) {
                     store.markTitle(row.id, resolved.title, resolved.author);
                     result.titled++;

media-scrape/src/extract.ts

@@ -34,6 +34,8 @@ export interface ExtractedMedia {
     previewUrl: string | null;
     /** Embed title, when Discord provides one (YouTube and friends). Null elsewhere. */
     title: string | null;
+    /** Embed author (the YouTube channel Discord shows). Null elsewhere. */
+    titleAuthor: string | null;
 }
 
 /**
@@ -95,7 +97,8 @@ function extractEmbed(embed: CoreEmbed): ExtractedMedia | null {
         width: embed.width ?? null,
         height: embed.height ?? null,
         durationSecs: null,
-        title: embed.title ?? null
+        title: embed.title ?? null,
+        titleAuthor: embed.authorName ?? null
     };
 
     if (embed.videoUrl) {
@@ -150,7 +153,8 @@ function extractSticker(sticker: CoreSticker): ExtractedMedia | null {
         durationSecs: null,
         downloaded: false,
         previewUrl: null,
-        title: null
+        title: null,
+        titleAuthor: null
     };
 }
 
@@ -178,7 +182,8 @@ function extractFrom(message: MediaMessage): ExtractedMedia[] {
                     : null,
             downloaded: false,
             previewUrl: null,
-            title: null
+            title: null,
+            titleAuthor: null
         });
     }
 

media-scrape/src/store.ts

@@ -404,7 +404,7 @@ export class ScrapeStore {
             "INSERT OR REPLACE INTO messages (id, author_id, author_name, timestamp, content) VALUES (?, ?, ?, ?, ?)"
         );
         const insertMedia = this.db.prepare(
-            "INSERT OR IGNORE INTO media (kind, source, author_id, author_name, posted_at, url, play_url, provider, content_type, size, width, height, aspect_ratio, duration_secs, downloaded, preview_url, title, title_key, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+            "INSERT OR IGNORE INTO media (kind, source, author_id, author_name, posted_at, url, play_url, provider, content_type, size, width, height, aspect_ratio, duration_secs, downloaded, preview_url, title, title_key, title_author, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
         );
         const findMedia = this.db.prepare("SELECT id FROM media WHERE url = ?");
         const linkSource = this.db.prepare(
@@ -443,6 +443,7 @@ export class ScrapeStore {
                         item.previewUrl,
                         item.title,
                         item.title ? normalizeTitleKey(item.title) : null,
+                        item.titleAuthor,
                         createdAt
                     );
                     if (result.changes > 0) added[item.kind]++;

media-scrape/src/types.ts

@@ -35,6 +35,8 @@ export interface CoreEmbed {
     type: string | null;
     url: string | null;
     title: string | null;
+    /** Discord's embed author line (the YouTube channel name). */
+    authorName?: string | null;
     provider: string | null;
     videoUrl: string | null;
     imageUrl: string | null;