From d502f4c6d95b74896f40070d07229997f0850f31 Mon Sep 17 00:00:00 2001
From: bashonly <88596187+bashonly@users.noreply.github.com>
Date: Tue, 2 Jul 2024 16:24:17 -0500
Subject: [PATCH] [pp/embedthumbnail] Fix embedding with mutagen (#10337)

Fixes regression in f2a4ea1794718e4dc0148bc172cb877f1080903b

Closes #10335
Authored by: bashonly
---
 yt_dlp/postprocessor/embedthumbnail.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/yt_dlp/postprocessor/embedthumbnail.py b/yt_dlp/postprocessor/embedthumbnail.py
index f2228ac61..16c8bcdda 100644
--- a/yt_dlp/postprocessor/embedthumbnail.py
+++ b/yt_dlp/postprocessor/embedthumbnail.py
@@ -134,7 +134,7 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
                     meta = MP4(filename)
                     # NOTE: the 'covr' atom is a non-standard MPEG-4 atom,
                     # Apple iTunes 'M4A' files include the 'moov.udta.meta.ilst' atom.
-                    meta.tags['covr'] = [MP4Cover(data=thumb_data, imageformat=f)]
+                    meta.tags['covr'] = [MP4Cover(data=thumb_data, imageformat=f[type_])]
                     meta.save()
                     temp_filename = filename
                 except Exception as err: