From 2a09c1b8ab348c43ece3cf246645e7335a802ca9 Mon Sep 17 00:00:00 2001
From: pulpe <Pulpan3@gmail.com>
Date: Sat, 25 Apr 2015 20:41:15 +0200
Subject: [PATCH] [postprocessor/embedthumbnail] Fix mp3 embedding with avconv
 (fixes #5526)

---
 youtube_dl/postprocessor/embedthumbnail.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/youtube_dl/postprocessor/embedthumbnail.py b/youtube_dl/postprocessor/embedthumbnail.py
index 7ba98a0ea6..4868a42fdc 100644
--- a/youtube_dl/postprocessor/embedthumbnail.py
+++ b/youtube_dl/postprocessor/embedthumbnail.py
@@ -11,6 +11,7 @@ from ..compat import (
     compat_urlretrieve,
 )
 from ..utils import (
+    determine_ext,
     check_executable,
     encodeFilename,
     PostProcessingError,
@@ -27,7 +28,7 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
     def run(self, info):
         filename = info['filepath']
         temp_filename = prepend_extension(filename, 'temp')
-        temp_thumbnail = prepend_extension(filename, 'thumb')
+        temp_thumbnail = filename + '.' + determine_ext(info['thumbnail'])
 
         if not info.get('thumbnail'):
             raise EmbedThumbnailPPError('Thumbnail was not found. Nothing to do.')