From 985637cbbfc1a79091eb2f5ca4afec84f6616c75 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Tue, 12 Feb 2019 00:13:50 +0700
Subject: [PATCH] [twitch] Add new source format detection approach (closes
 #19193)

---
 youtube_dl/extractor/twitch.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/youtube_dl/extractor/twitch.py b/youtube_dl/extractor/twitch.py
index 401615683..8c87f6dd3 100644
--- a/youtube_dl/extractor/twitch.py
+++ b/youtube_dl/extractor/twitch.py
@@ -136,7 +136,12 @@ def _prefer_source(self, formats):
             source = next(f for f in formats if f['format_id'] == 'Source')
             source['preference'] = 10
         except StopIteration:
-            pass  # No Source stream present
+            for f in formats:
+                if '/chunked/' in f['url']:
+                    f.update({
+                        'source_preference': 10,
+                        'format_note': 'Source',
+                    })
         self._sort_formats(formats)