From 5ea765fb720523efb2702358e188e5157d08775b Mon Sep 17 00:00:00 2001
From: Remita Amine <remitamine@gmail.com>
Date: Wed, 29 Nov 2017 17:50:38 +0100
Subject: [PATCH] [mtv] correct scc extention in extracted subtitles(closes
 #13730)

---
 youtube_dl/extractor/mtv.py | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/youtube_dl/extractor/mtv.py b/youtube_dl/extractor/mtv.py
index 1154a3536..7a3b57abd 100644
--- a/youtube_dl/extractor/mtv.py
+++ b/youtube_dl/extractor/mtv.py
@@ -115,10 +115,17 @@ class MTVServicesInfoExtractor(InfoExtractor):
             if transcript.get('kind') != 'captions':
                 continue
             lang = transcript.get('srclang')
-            subtitles[lang] = [{
-                'url': compat_str(typographic.get('src')),
-                'ext': typographic.get('format')
-            } for typographic in transcript.findall('./typographic')]
+            for typographic in transcript.findall('./typographic'):
+                sub_src = typographic.get('src')
+                if not sub_src:
+                    continue
+                ext = typographic.get('format')
+                if ext == 'cea-608':
+                    ext = 'scc'
+                subtitles.setdefault(lang, []).append({
+                    'url': compat_str(sub_src),
+                    'ext': ext
+                })
         return subtitles
 
     def _get_video_info(self, itemdoc, use_hls=True):