fix: improve media extraction

src/lib/twitter-client-utils.ts

@@ -189,18 +189,21 @@ export function extractMedia(result: GraphqlTweetResult | undefined): TweetMedia
 
     // Extract video URL for video/animated_gif
     if ((item.type === 'video' || item.type === 'animated_gif') && item.video_info?.variants) {
-      // Find highest bitrate mp4 variant
+      // Prefer highest bitrate MP4, fall back to first MP4 when bitrate is missing.
-      const mp4Variants = item.video_info.variants
+      const mp4Variants = item.video_info.variants.filter(
-        .filter((v): v is { bitrate: number; content_type: string; url: string } =>
+        (v): v is { bitrate?: number; content_type: string; url: string } =>
-          v.content_type === 'video/mp4' && typeof v.bitrate === 'number' && typeof v.url === 'string'
+          v.content_type === 'video/mp4' && typeof v.url === 'string',
-        )
+      );
+      const mp4WithBitrate = mp4Variants
+        .filter((v): v is { bitrate: number; content_type: string; url: string } => typeof v.bitrate === 'number')
         .sort((a, b) => b.bitrate - a.bitrate);
+      const selectedVariant = mp4WithBitrate[0] ?? mp4Variants[0];
 
-      if (mp4Variants.length > 0) {
+      if (selectedVariant) {
-        mediaItem.videoUrl = mp4Variants[0].url;
+        mediaItem.videoUrl = selectedVariant.url;
       }
 
-      if (item.video_info.duration_millis) {
+      if (typeof item.video_info.duration_millis === 'number') {
         mediaItem.durationMs = item.video_info.duration_millis;
       }
     }

tests/extract-media.test.ts

@@ -110,6 +110,31 @@ describe('extractMedia', () => {
     });
   });
 
+  it('falls back to first mp4 when bitrate is missing', () => {
+    const result: GraphqlTweetResult = {
+      legacy: {
+        extended_entities: {
+          media: [
+            {
+              type: 'video',
+              media_url_https: 'https://pbs.twimg.com/ext_tw_video_thumb/123/img/thumb.jpg',
+              video_info: {
+                variants: [
+                  { content_type: 'video/mp4', url: 'https://video.twimg.com/no-bitrate.mp4' },
+                  { content_type: 'application/x-mpegURL', url: 'https://video.twimg.com/pl.m3u8' },
+                ],
+              },
+            },
+          ],
+        },
+      },
+    };
+
+    const media = extractMedia(result);
+    expect(media).toHaveLength(1);
+    expect(media![0].videoUrl).toBe('https://video.twimg.com/no-bitrate.mp4');
+  });
+
   it('extracts animated_gif with video url', () => {
     const result: GraphqlTweetResult = {
       legacy: {
@@ -140,6 +165,29 @@ describe('extractMedia', () => {
     expect(media![0].durationMs).toBeUndefined();
   });
 
+  it('keeps zero duration for videos', () => {
+    const result: GraphqlTweetResult = {
+      legacy: {
+        extended_entities: {
+          media: [
+            {
+              type: 'video',
+              media_url_https: 'https://pbs.twimg.com/ext_tw_video_thumb/zero.jpg',
+              video_info: {
+                duration_millis: 0,
+                variants: [{ content_type: 'video/mp4', url: 'https://video.twimg.com/zero.mp4' }],
+              },
+            },
+          ],
+        },
+      },
+    };
+
+    const media = extractMedia(result);
+    expect(media).toHaveLength(1);
+    expect(media![0].durationMs).toBe(0);
+  });
+
   it('handles multiple media items', () => {
     const result: GraphqlTweetResult = {
       legacy: {