Add more post-processing stages

playlist = After entire playlist
after_video = After downloading all formats of a video

yt_dlp/YoutubeDL.py

@@ -1766,6 +1766,10 @@ class YoutubeDL(object):
 
         for tmpl in self.params['forceprint'].get('playlist', []):
             self._forceprint(tmpl, ie_result)
+
+        for pp in self._pps['playlist']:
+            ie_result = self.run_pp(pp, ie_result)
+
         self.to_screen('[download] Finished downloading playlist: %s' % playlist)
         return ie_result
 
@@ -2564,6 +2568,10 @@ class YoutubeDL(object):
                 new_info['__original_infodict'] = info_dict
                 new_info.update(fmt)
                 self.process_info(new_info)
+
+            for pp in self._pps['after_video']:
+                info_dict = self.run_pp(pp, info_dict)
+
         # We update the info dict with the selected best quality format (backwards compatibility)
         if formats_to_download:
             info_dict.update(formats_to_download[-1])

yt_dlp/options.py

@@ -1482,8 +1482,10 @@ def parseOpts(overrideArguments=None):
             'ARGS are a semicolon ";" delimited list of NAME=VALUE. '
             'The "when" argument determines when the postprocessor is invoked. '
             'It can be one of "pre_process" (after extraction), '
-            '"before_dl" (before video download), "post_process" (after video download; default) '
-            'or "after_move" (after moving file to their final locations). '
+            '"before_dl" (before video download), "post_process" (after video download; default), '
+            '"after_move" (after moving file to their final locations), '
+            '"after_video" (after downloading and processing all formats of a video), '
+            'or "playlist" (end of playlist). '
             'This option can be used multiple times to add different postprocessors'))
 
     sponsorblock = optparse.OptionGroup(parser, 'SponsorBlock Options', description=(

yt_dlp/utils.py

@@ -3036,7 +3036,7 @@ def qualities(quality_ids):
     return q
 
 
-POSTPROCESS_WHEN = {'pre_process', 'before_dl', 'after_move', 'post_process'}
+POSTPROCESS_WHEN = {'pre_process', 'before_dl', 'after_move', 'post_process', 'after_video', 'playlist'}
 
 
 DEFAULT_OUTTMPL = {