From b4b855ebc7fac536a85f087f6921df69dec4e470 Mon Sep 17 00:00:00 2001
From: pukkandan <pukkandan.ytdlp@gmail.com>
Date: Tue, 19 Oct 2021 21:51:33 +0530
Subject: [PATCH] [fragment] Print error message when skipping fragment

---
 yt_dlp/downloader/external.py | 6 +++---
 yt_dlp/downloader/fragment.py | 7 ++++---
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/yt_dlp/downloader/external.py b/yt_dlp/downloader/external.py
index 40b9dcfe3..e30efb057 100644
--- a/yt_dlp/downloader/external.py
+++ b/yt_dlp/downloader/external.py
@@ -152,11 +152,11 @@ def _call_downloader(self, tmpfilename, info_dict):
             fragment_filename = '%s-Frag%d' % (tmpfilename, frag_index)
             try:
                 src, _ = sanitize_open(fragment_filename, 'rb')
-            except IOError:
+            except IOError as err:
                 if skip_unavailable_fragments and frag_index > 1:
-                    self.to_screen('[%s] Skipping fragment %d ...' % (self.get_basename(), frag_index))
+                    self.report_skip_fragment(frag_index, err)
                     continue
-                self.report_error('Unable to open fragment %d' % frag_index)
+                self.report_error(f'Unable to open fragment {frag_index}; {err}')
                 return -1
             dest.write(decrypt_fragment(fragment, src.read()))
             src.close()
diff --git a/yt_dlp/downloader/fragment.py b/yt_dlp/downloader/fragment.py
index 6a490131b..c345f3148 100644
--- a/yt_dlp/downloader/fragment.py
+++ b/yt_dlp/downloader/fragment.py
@@ -72,8 +72,9 @@ def report_retry_fragment(self, err, frag_index, count, retries):
             '\r[download] Got server HTTP error: %s. Retrying fragment %d (attempt %d of %s) ...'
             % (error_to_compat_str(err), frag_index, count, self.format_retries(retries)))
 
-    def report_skip_fragment(self, frag_index):
-        self.to_screen('[download] Skipping fragment %d ...' % frag_index)
+    def report_skip_fragment(self, frag_index, err=None):
+        err = f' {err};' if err else ''
+        self.to_screen(f'[download]{err} Skipping fragment {frag_index:d} ...')
 
     def _prepare_url(self, info_dict, url):
         headers = info_dict.get('http_headers')
@@ -443,7 +444,7 @@ def download_fragment(fragment, ctx):
         def append_fragment(frag_content, frag_index, ctx):
             if not frag_content:
                 if not is_fatal(frag_index - 1):
-                    self.report_skip_fragment(frag_index)
+                    self.report_skip_fragment(frag_index, 'fragment not found')
                     return True
                 else:
                     ctx['dest_stream'].close()