From 3206c24475056adb179ef97c21197740590631c5 Mon Sep 17 00:00:00 2001
From: yinyajiang <32933356+yinyajiang@users.noreply.github.com>
Date: Wed, 25 Dec 2024 11:13:55 +0800
Subject: [PATCH] Update facebook.py

---
 yt_dlp/extractor/facebook.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/yt_dlp/extractor/facebook.py b/yt_dlp/extractor/facebook.py
index d9c7c97ea0b4..652b88e0d984 100644
--- a/yt_dlp/extractor/facebook.py
+++ b/yt_dlp/extractor/facebook.py
@@ -643,6 +643,7 @@ def parse_graphql_video(video):
                                 'quality': q(format_id) - 3,
                                 'url': playable_url,
                             })
+                            self._correct_format(formats[-1])
                     extract_dash_manifest(fmt_data, formats)
 
                     # New videoDeliveryResponse formats extraction
@@ -899,6 +900,19 @@ def _real_extract(self, url):
         real_url = self._VIDEO_PAGE_TEMPLATE % video_id if url.startswith('facebook:') else url
         return self._extract_from_url(real_url, video_id)
 
+    @staticmethod
+    def _correct_format(f):
+        if not f:
+            return
+        if f.get('format_id', '') in ('sd', 'hd') and 'acodec' not in f and 'vcodec' not in f:
+            format_ext = determine_ext(f.get('url', ''))
+            if format_ext == 'mp4':
+                f['vcodec'] = 'mp4'
+                f['acodec'] = 'none'
+            elif format_ext == 'm4a':
+                f['vcodec'] = 'none'
+                f['acodec'] = 'm4a'
+
 
 class FacebookPluginsVideoIE(InfoExtractor):
     _VALID_URL = r'https?://(?:[\w-]+\.)?facebook\.com/plugins/video\.php\?.*?\bhref=(?P<id>https.+)'