[ie/youtube] Check any `ios` m3u8 formats prior to download (#13524)

Closes #13511
Authored by: bashonly

yt_dlp/YoutubeDL.py

@@ -2219,6 +2219,7 @@ class YoutubeDL:
                         self.report_warning(f'Unable to delete temporary file "{temp_file.name}"')
             f['__working'] = success
             if success:
+                f.pop('__needs_testing', None)
                 yield f
             else:
                 self.to_screen('[info] Unable to download format {}. Skipping...'.format(f['format_id']))
@@ -3963,6 +3964,7 @@ class YoutubeDL:
                     self._format_out('UNSUPPORTED', self.Styles.BAD_FORMAT) if f.get('ext') in ('f4f', 'f4m') else None,
                     (self._format_out('Maybe DRM', self.Styles.WARNING) if f.get('has_drm') == 'maybe'
                      else self._format_out('DRM', self.Styles.BAD_FORMAT) if f.get('has_drm') else None),
+                    self._format_out('Untested', self.Styles.WARNING) if f.get('__needs_testing') else None,
                     format_field(f, 'format_note'),
                     format_field(f, 'container', ignore=(None, f.get('ext'))),
                     delim=', '), delim=' '),

yt_dlp/extractor/youtube/_video.py

@@ -3556,6 +3556,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                 f['format_note'] = join_nonempty(f.get('format_note'), 'MISSING POT', delim=' ')
                 f['source_preference'] -= 20
 
+            # XXX: Check if IOS HLS formats are affected by player PO token enforcement; temporary
+            # See https://github.com/yt-dlp/yt-dlp/issues/13511
+            if proto == 'hls' and client_name == 'ios':
+                f['__needs_testing'] = True
+
             itags[itag].add(key)
 
             if itag and all_formats:
@@ -4284,6 +4289,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
         if upload_date and live_status not in ('is_live', 'post_live', 'is_upcoming'):
             # Newly uploaded videos' HLS formats are potentially problematic and need to be checked
+            # XXX: This is redundant for as long as we are already checking all IOS HLS formats
             upload_datetime = datetime_from_str(upload_date).replace(tzinfo=dt.timezone.utc)
             if upload_datetime >= datetime_from_str('today-2days'):
                 for fmt in info['formats']: