From 39d4c1be4d601a3297157315652637ca52000965 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Thu, 1 Jun 2017 23:29:45 +0700
Subject: [PATCH] [youtube] Improve chapters extraction (closes #13247)

---
 test/test_youtube_chapters.py   | 7 +++++++
 youtube_dl/extractor/youtube.py | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/test/test_youtube_chapters.py b/test/test_youtube_chapters.py
index cb12f8384..324ca8525 100644
--- a/test/test_youtube_chapters.py
+++ b/test/test_youtube_chapters.py
@@ -254,6 +254,13 @@ class TestYoutubeChapters(unittest.TestCase):
                 'title': '3 - Из серпов луны...[Iz serpov luny]',
             }]
         ),
+        (
+            # https://www.youtube.com/watch?v=xZW70zEasOk
+            # time point more than duration
+            '''● LCS Spring finals: Saturday and Sunday from <a href="#" onclick="yt.www.watch.player.seekTo(13*60+30);return false;">13:30</a> outside the venue! <br />● PAX East: Fri, Sat & Sun - more info in tomorrows video on the main channel!''',
+            283,
+            []
+        ),
     ]
 
     def test_youtube_chapters(self):
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 40ac1a019..bf4f4e139 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1353,10 +1353,16 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             start_time = parse_duration(time_point)
             if start_time is None:
                 continue
+            if start_time > duration:
+                break
             end_time = (duration if next_num == len(chapter_lines)
                         else parse_duration(chapter_lines[next_num][1]))
             if end_time is None:
                 continue
+            if end_time > duration:
+                end_time = duration
+            if start_time > end_time:
+                break
             chapter_title = re.sub(
                 r'<a[^>]+>[^<]+</a>', '', chapter_line).strip(' \t-')
             chapter_title = re.sub(r'\s+', ' ', chapter_title)
-- 
2.22.2