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

Code before:
            'series': ('custom_data', 'program_name'),
        })

        tf_url = urljoin(
            url,
            self._search_regex(r'<script src=["\'](/assets/tf\.[^"\']+\.js)["\']', page, 'stream API config')
        )
        tf_js = self._download_webpage(tf_url, video_id, note='Downloading stream API config')
        video_url = self._search_regex(r'videoPlaybackUrl: *[\'"]([^\'"]+)[\'"]', tf_js, 'stream API url')
        api_key = self._search_regex(r'api_key: *[\'"]([^\'"]+)[\'"]', tf_js, 'stream API key')

        try:
            source_meta = self._download_json(f'{video_url}ref:{video_id}', video_id,
                                              headers={'X-Streaks-Api-Key': api_key},
                                              note='Downloading stream metadata')
        except ExtractorError as e:
            if isinstance(e.cause, HTTPError) and e.cause.status == 403:
                self.raise_geo_restricted(countries=['JP'])
            raise

        formats = []
        subs = []
        for i in traverse_obj(source_meta, ('sources', ..., 'src')):
            format, sub = self._extract_m3u8_formats_and_subtitles(i, video_id)
            formats.extend(format)
            subs.extend(sub)

        return {
            'title': get_element_text_and_html_by_tag('h3', page)[0],
            'episode': traverse_obj(episode, ('title', lambda _, v: not v.get('is_phonetic'), 'value'), get_all=False),
            **episode_meta,
            'formats': formats,
            'subtitles': sub,
        }


class TBSJPProgramIE(InfoExtractor):
    _VALID_URL = r'https://cu\.tbs\.co\.jp/program/(?P<id>[\d]+)'
    _TESTS = [{
        'url': 'https://cu.tbs.co.jp/program/23601',
        'playlist_mincount': 4,
        'info_dict': {
            'id': '23601',
            'categories': ['エンタメ', 'ミライカプセル', '会社', '働く', 'バラエティ', '動画'],
            'description': '幼少期の夢は大人になって、どう成長したのだろうか？\nそしてその夢は今後、どのように広がっていくのか？\nいま話題の会社で働く人の「夢の成長」を描く',
            'series': 'ミライカプセル　-I have a dream-',
            'title': 'ミライカプセル　-I have a dream-'
        }
    }]

    def _real_extract(self, url):

Review comment (refactor):
 - avoid redefining built-ins like `format`
 - use `_merge_subtitles()`
 - IMO don't use `i` as var name if it's not an index value
 - if multiple m3u8 URLs, make m3u8 extraction non-fatal so that 1 bad URL doesn't throw
 ```suggestion
        for src in traverse_obj(source_meta, ('sources', ..., 'src')):
            fmts, subs = self._extract_m3u8_formats_and_subtitles(src, video_id, fatal=False)
            formats.extend(fmts)
            self._merge_subtitles(subs, target=subtitles)
```

Code after:
        api_key = self._search_regex(r'api_key:\s*[\'"]([^\'"]+)[\'"]', tf_js, 'stream API key')

        try:
            source_meta = self._download_json(f'{video_url}ref:{video_id}', video_id,
                                              headers={'X-Streaks-Api-Key': api_key},
                                              note='Downloading stream metadata')
        except ExtractorError as e:
            if isinstance(e.cause, HTTPError) and e.cause.status == 403:
                self.raise_geo_restricted(countries=['JP'])
            raise

        formats, subtitles = [], {}
        for src in traverse_obj(source_meta, ('sources', ..., 'src')):
            fmts, subs = self._extract_m3u8_formats_and_subtitles(src, video_id, fatal=False)
            formats.extend(fmts)
            self._merge_subtitles(subs, target=subtitles)

        return {
            'title': try_call(lambda: clean_html(get_element_text_and_html_by_tag('h3', webpage)[0])),
            'id': video_id,
            **traverse_obj(episode, {
                'categories': ('keywords', {list}),
                'id': ('content_id', {str}),
                'description': ('description', 0, 'value'),
                'timestamp': ('created_at', {unified_timestamp}),
                'release_timestamp': ('pub_date', {unified_timestamp}),
                'duration': ('tv_episode_info', 'duration', {int_or_none}),
                'episode_number': ('tv_episode_info', 'episode_number', {int_or_none}),
                'episode': ('title', lambda _, v: not v.get('is_phonetic'), 'value'),
                'series': ('custom_data', 'program_name'),
            }, get_all=False),
            'formats': formats,
            'subtitles': subtitles,
        }


class TBSJPProgramIE(InfoExtractor):
    _VALID_URL = r'https?://cu\.tbs\.co\.jp/program/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://cu.tbs.co.jp/program/23601',
        'playlist_mincount': 4,
        'info_dict': {
            'id': '23601',
            'categories': ['エンタメ', 'ミライカプセル', '会社', '働く', 'バラエティ', '動画'],
            'description': '幼少期の夢は大人になって、どう成長したのだろうか？\nそしてその夢は今後、どのように広がっていくのか？\nいま話題の会社で働く人の「夢の成長」を描く',
            'series': 'ミライカプセル　-I have a dream-',
            'title': 'ミライカプセル　-I have a dream-'
        }
    }]

    def _real_extract(self, url):