[Pladform] Fix redirection to external player (yt-dlp#2550)

Authored by: KiberInfinity

Author: KiberInfinity

yt_dlp/extractor/pladform.py

@@ -28,6 +28,24 @@ class PladformIE(InfoExtractor):
                         (?P<id>\d+)
                     '''
     _TESTS = [{
+        'url': 'http://out.pladform.ru/player?pl=18079&type=html5&videoid=100231282',
+        'info_dict': {
+            'id': '6216d548e755edae6e8280667d774791',
+            'ext': 'mp4',
+            'timestamp': 1406117012,
+            'title': 'Гарик Мартиросян и Гарик Харламов - Кастинг на концерт ко Дню милиции',
+            'age_limit': 0,
+            'upload_date': '20140723',
+            'thumbnail': str,
+            'view_count': int,
+            'description': str,
+            'category': list,
+            'uploader_id': '12082',
+            'uploader': 'Comedy Club',
+            'duration': 367,
+        },
+        'expected_warnings': ['HTTP Error 404: Not Found']
+    }, {
         'url': 'https://out.pladform.ru/player?pl=64471&videoid=3777899&vk_puid15=0&vk_puid34=0',
         'md5': '53362fac3a27352da20fa2803cc5cd6f',
         'info_dict': {
@@ -63,13 +81,19 @@ def _real_extract(self, url):
             'http://out.pladform.ru/getVideo', video_id, query={
                 'pl': pl,
                 'videoid': video_id,
-            })
+            }, fatal=False)
 
         def fail(text):
             raise ExtractorError(
                 '%s returned error: %s' % (self.IE_NAME, text),
                 expected=True)
 
+        if not video:
+            targetUrl = self._request_webpage(url, video_id, note='Resolving final URL').geturl()
+            if targetUrl == url:
+                raise ExtractorError('Can\'t parse page')
+            return self.url_result(targetUrl)
+
         if video.tag == 'error':
             fail(video.text)