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

Code before:
        formats = self._extract_formats(video_assets, video_id)

        subtitles = {}
        ttml_resource = video_assets.get('videoSubtitle')
        if ttml_resource:
            subtitles['de'] = [{
                'url': ttml_resource,
                'ext': 'ttml',
            }]
        webvtt_resource = video_assets.get('webvttUrl')
        if webvtt_resource:
            vtt = {
                'url': webvtt_resource,
                'ext': 'webvtt'
            }
            subtitles['de'].append(vtt)

        return {
            'id': video_id,
            'title': title,
            'description': doc['description'],
            'timestamp': timestamp,
            'duration': duration,
            'formats': formats,
            'subtitles': subtitles,
            'uploader': 'KIKA'
        }

    def _extract_formats(self, media_info, video_id):
        streams = media_info.get('assets', [])
        formats = []
        for num, media in enumerate(streams):
            stream_url = media.get("url")
            ext = determine_ext(stream_url)
            if ext == 'm3u8':
                formats.extend(self._extract_m3u8_formats(
                    stream_url, video_id, 'mp4', 'm3u8_native',
                    m3u8_id='hls', fatal=False))
            else:
                f = {
                    'url': stream_url,
                    'format_id': 'a%s-%s' % (num, ext),
                    'width': media.get('frameWidth'),
                    'height': media.get('frameHeight'),
                    'filesize': int_or_none(media.get('fileSize')),
                    'abr': int_or_none(media.get('bitrateAudio')),
                    'vbr': int_or_none(media.get('bitrateVideo')),
                }
                formats.append(f)
        return formats


Review comment (refactor):
when changing extractors, you need to return https://github.com/yt-dlp/yt-dlp/blob/8fb80d909ce83a7827ca9bffd78495e37c0b5f52/yt_dlp/extractor/common.py#L347

Assuming the id is same b/w the extractors, it'll look like
```py
            '_old_archive_ids': [f'MDR {video_id}']
```

Code after:
            'upload_date': '20231218',
            'episode_number': 7,
            'modified_date': '20240319',
            'modified_timestamp': 1710880610,
            'episode': 'Episode 7',
            'season_number': 1,
            'season': 'Season 1',
        },
    }, {
        'url': 'https://www.kika.de/bernd-das-brot/astrobrot/videos/video90088',
        'md5': 'ffd1b700d7de0a6616a1d08544c77294',
        'info_dict': {
            'id': 'video90088',
            'ext': 'mp4',
            'upload_date': '20221102',
            'timestamp': 1667390580,
            'duration': 197,
            'modified_timestamp': 1711093771,
            'episode_number': 8,
            'title': 'Es ist nicht leicht, ein Astrobrot zu sein',
            'modified_date': '20240322',
            'description': 'md5:d3641deaf1b5515a160788b2be4159a9',
            'season_number': 1,
            'episode': 'Episode 8',
            'season': 'Season 1',
        },
    }]

    def _real_extract(self, url):
        video_id = self._match_id(url)

        doc = self._download_json(f'https://www.kika.de/_next-api/proxy/v1/videos/{video_id}', video_id)
        video_assets = self._download_json(doc['assets']['url'], video_id)

        subtitles = {}
        if ttml_resource := url_or_none(video_assets.get('videoSubtitle')):
            subtitles['de'] = [{
                'url': ttml_resource,
                'ext': 'ttml',
            }]
        if webvtt_resource := url_or_none(video_assets.get('webvttUrl')):
            subtitles.setdefault('de', []).append({
                'url': webvtt_resource,
                'ext': 'vtt',
            })

        return {
            'id': video_id,
            'formats': list(self._extract_formats(video_assets, video_id)),
            'subtitles': subtitles,
            **traverse_obj(doc, {