From eabb4680fdb09ba1f48d174a700a2e3b43f82add Mon Sep 17 00:00:00 2001
From: bashonly <88596187+bashonly@users.noreply.github.com>
Date: Thu, 26 Sep 2024 18:27:16 -0500
Subject: [PATCH] [ie/niconico] Fix m3u8 formats extraction (#11103)

Closes #10724
Authored by: bashonly
---
 yt_dlp/extractor/niconico.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/yt_dlp/extractor/niconico.py b/yt_dlp/extractor/niconico.py
index 179e7a9b1..e06740d62 100644
--- a/yt_dlp/extractor/niconico.py
+++ b/yt_dlp/extractor/niconico.py
@@ -420,7 +420,7 @@ class NiconicoIE(InfoExtractor):
                 'x-request-with': 'https://www.nicovideo.jp',
             })['data']['contentUrl']
         # Getting all audio formats results in duplicate video formats which we filter out later
-        dms_fmts = self._extract_m3u8_formats(dms_m3u8_url, video_id)
+        dms_fmts = self._extract_m3u8_formats(dms_m3u8_url, video_id, 'mp4')
 
         # m3u8 extraction does not provide audio bitrates, so extract from the API data and fix
         for audio_fmt in traverse_obj(dms_fmts, lambda _, v: v['vcodec'] == 'none'):
@@ -432,7 +432,6 @@ class NiconicoIE(InfoExtractor):
                     'asr': ('samplingRate', {int_or_none}),
                 }), get_all=False),
                 'acodec': 'aac',
-                'ext': 'm4a',
             }
 
         # Sort before removing dupes to keep the format dicts with the lowest tbr