Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/youtube/_video.py (Python)

Code before:
                f['source_preference'] += 100

            f['quality'] = q(itag_qualities.get(try_get(f, lambda f: f['format_id'].split('-')[0]), -1))
            if f['quality'] == -1 and f.get('height'):
                f['quality'] = q(res_qualities[min(res_qualities, key=lambda x: abs(x - f['height']))])
            if self.get_param('verbose') or all_formats:
                f['format_note'] = join_nonempty(
                    f.get('format_note'), short_client_name(client_name), delim=', ')
            if f.get('fps') and f['fps'] <= 1:
                del f['fps']

            if proto == 'hls' and f.get('has_drm'):
                f['has_drm'] = 'maybe'
                f['source_preference'] -= 5
            return True

        subtitles = {}
        for sd in streaming_data:
            client_name = sd[STREAMING_DATA_CLIENT_NAME]
            fetch_pot_func = sd[STREAMING_DATA_FETCH_GVS_PO_TOKEN]
            is_premium_subscriber = sd.get(STREAMING_DATA_IS_PREMIUM_SUBSCRIBER)
            has_player_token = sd.get(STREAMING_DATA_PLAYER_TOKEN_PROVIDED)

            hls_manifest_url = 'hls' not in skip_manifests and sd.get('hlsManifestUrl')
            if hls_manifest_url:
                pot_policy: GvsPoTokenPolicy = self._get_default_ytcfg(client_name).get('GVS_PO_TOKEN_POLICY')[StreamingProtocol.HLS]
                require_po_token = pot_required(pot_policy, is_premium_subscriber, has_player_token)
                po_token = gvs_pots.get(client_name, fetch_pot_func(required=require_po_token or pot_policy.recommended))
                if po_token:
                    hls_manifest_url = hls_manifest_url.rstrip('/') + f'/pot/{po_token}'
                    gvs_pots[client_name] = po_token
                if require_po_token and not po_token and 'missing_pot' not in self._configuration_arg('formats'):
                    self._report_pot_format_skipped(video_id, client_name, 'hls')
                else:
                    fmts, subs = self._extract_m3u8_formats_and_subtitles(
                        hls_manifest_url, video_id, 'mp4', fatal=False, live=live_status == 'is_live')
                    for sub in traverse_obj(subs, (..., ..., {dict})):
                        # TODO: If HLS video requires a PO Token, do the subs also require pot?
                        # Save client name for debugging
                        sub[STREAMING_DATA_CLIENT_NAME] = client_name
                    subtitles = self._merge_subtitles(subs, subtitles)
                    for f in fmts:
                        if process_manifest_format(f, 'hls', client_name, self._search_regex(
                                r'/itag/(\d+)', f['url'], 'itag', default=None), require_po_token and not po_token):
                            yield f

            dash_manifest_url = 'dash' not in skip_manifests and sd.get('dashManifestUrl')
            if dash_manifest_url:
                pot_policy: GvsPoTokenPolicy = self._get_default_ytcfg(client_name).get('GVS_PO_TOKEN_POLICY')[StreamingProtocol.DASH]
                require_po_token = pot_required(pot_policy, is_premium_subscriber, has_player_token)
                po_token = gvs_pots.get(client_name, fetch_pot_func(required=require_po_token or pot_policy.recommended))

Review comment (suggestion):
```suggestion
                pot_policy: GvsPoTokenPolicy = self._get_default_ytcfg(
                    client_name)['GVS_PO_TOKEN_POLICY'][StreamingProtocol.HLS]
```

Code after:
            if itag in ('616', '235'):
                f['format_note'] = join_nonempty(f.get('format_note'), 'Premium', delim=' ')
                f['source_preference'] += 100

            f['quality'] = q(itag_qualities.get(try_get(f, lambda f: f['format_id'].split('-')[0]), -1))
            if f['quality'] == -1 and f.get('height'):
                f['quality'] = q(res_qualities[min(res_qualities, key=lambda x: abs(x - f['height']))])
            if self.get_param('verbose') or all_formats:
                f['format_note'] = join_nonempty(
                    f.get('format_note'), short_client_name(client_name), delim=', ')
            if f.get('fps') and f['fps'] <= 1:
                del f['fps']

            if proto == 'hls' and f.get('has_drm'):
                f['has_drm'] = 'maybe'
                f['source_preference'] -= 5
            return True

        subtitles = {}
        for sd in streaming_data:
            client_name = sd[STREAMING_DATA_CLIENT_NAME]
            fetch_pot_func = sd[STREAMING_DATA_FETCH_GVS_PO_TOKEN]
            is_premium_subscriber = sd[STREAMING_DATA_IS_PREMIUM_SUBSCRIBER]
            has_player_token = sd[STREAMING_DATA_PLAYER_TOKEN_PROVIDED]

            hls_manifest_url = 'hls' not in skip_manifests and sd.get('hlsManifestUrl')
            if hls_manifest_url:
                pot_policy: GvsPoTokenPolicy = self._get_default_ytcfg(
                    client_name)['GVS_PO_TOKEN_POLICY'][StreamingProtocol.HLS]
                require_po_token = gvs_pot_required(pot_policy, is_premium_subscriber, has_player_token)
                po_token = gvs_pots.get(client_name, fetch_pot_func(required=require_po_token or pot_policy.recommended))
                if po_token:
                    hls_manifest_url = hls_manifest_url.rstrip('/') + f'/pot/{po_token}'
                    if client_name not in gvs_pots:
                        gvs_pots[client_name] = po_token
                if require_po_token and not po_token and 'missing_pot' not in self._configuration_arg('formats'):
                    self._report_pot_format_skipped(video_id, client_name, 'hls')
                else:
                    fmts, subs = self._extract_m3u8_formats_and_subtitles(
                        hls_manifest_url, video_id, 'mp4', fatal=False, live=live_status == 'is_live')
                    for sub in traverse_obj(subs, (..., ..., {dict})):
                        # TODO: If HLS video requires a PO Token, do the subs also require pot?
                        # Save client name for debugging
                        sub[STREAMING_DATA_CLIENT_NAME] = client_name
                    subtitles = self._merge_subtitles(subs, subtitles)
                    for f in fmts:
                        if process_manifest_format(f, 'hls', client_name, self._search_regex(
                                r'/itag/(\d+)', f['url'], 'itag', default=None), require_po_token and not po_token):
                            yield f

            dash_manifest_url = 'dash' not in skip_manifests and sd.get('dashManifestUrl')