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

Code before:
        return {
            'id': str(channel_id),
            'title': live_detail.get('liveTitle'),
            'thumbnails': thumbnails,
            **traverse_obj(live_detail, {
                'timestamp': ('openDate', {lambda d: parse_iso8601(d, ' ')}),
                'view_count': ('concurrentUserCount', {int_or_none}),
                'channel': ('channel', 'channelName', {str}),
                'channel_id': ('channel', 'channelId', {str}),
                'channel_is_verified': ('channel', 'verifiedMark', {bool}),
            }),
            'is_live': True,
            'formats': formats,
            'subtitles': subtitles,
        }


class CHZZKVideoIE(InfoExtractor):
    IE_NAME = 'chzzk:video'
    _VALID_URL = r'https?://chzzk\.naver\.com/video/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://chzzk.naver.com/video/1754',
        "md5": "b0c0c1bb888d913b93d702b1512c7f06",
        'info_dict': {
            "id": "1754",
            "ext": "mp4",
            'title': '치지직 테스트 방송',
            'channel': '침착맨',
            'channel_id': 'bb382c2c0cc9fa7c86ab3b037fb5799c',
            'channel_is_verified': False,
            'thumbnail': r're:^https?://.*\.jpg$',
            'duration': 15577,
            'timestamp': 1702970505,
            'upload_date': '20231219',
            'view_count': int,
        },
    }]

    def _real_extract(self, url):
        video_id = self._match_id(url)
        video_meta = self._download_json(
            f'https://api.chzzk.naver.com/service/v2/videos/{video_id}', video_id,
            note='Downloading video info', errnote='Unable to download video info')['content']
        formats, subtitles = self._extract_mpd_formats_and_subtitles(
            f'https://apis.naver.com/neonplayer/vodplay/v1/playback/{video_meta["videoId"]}', video_id,
            query={
                'key': video_meta['inKey'],
                'env': 'real',
                'lc': 'en_US',
                'cpl': 'en_US',
            }, note='Downloading video playback', errnote='Unable to download video playback')

Review comment (suggestion):
```suggestion
        'md5': 'b0c0c1bb888d913b93d702b1512c7f06',
        'info_dict': {
            'id': '1754',
            'ext': 'mp4',
```

Code after:
                    f['quality'] = -2
            formats.extend(fmts)
            self._merge_subtitles(subs, target=subtitles)

        return {
            'id': channel_id,
            'is_live': True,
            'formats': formats,
            'subtitles': subtitles,
            'thumbnails': thumbnails,
            **traverse_obj(live_detail, {
                'title': ('liveTitle', {str}),
                'timestamp': ('openDate', {functools.partial(parse_iso8601, delimiter=' ')}),
                'concurrent_view_count': ('concurrentUserCount', {int_or_none}),
                'view_count': ('accumulateCount', {int_or_none}),
                'channel': ('channel', 'channelName', {str}),
                'channel_id': ('channel', 'channelId', {str}),
                'channel_is_verified': ('channel', 'verifiedMark', {bool}),
            }),
        }


class CHZZKVideoIE(InfoExtractor):
    IE_NAME = 'chzzk:video'
    _VALID_URL = r'https?://chzzk\.naver\.com/video/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://chzzk.naver.com/video/1754',
        'md5': 'b0c0c1bb888d913b93d702b1512c7f06',
        'info_dict': {
            'id': '1754',
            'ext': 'mp4',
            'title': '치지직 테스트 방송',
            'channel': '침착맨',
            'channel_id': 'bb382c2c0cc9fa7c86ab3b037fb5799c',
            'channel_is_verified': False,
            'thumbnail': r're:^https?://.*\.jpg$',
            'duration': 15577,
            'timestamp': 1702970505.417,
            'upload_date': '20231219',
            'view_count': int,
        },
    }]

    def _real_extract(self, url):
        video_id = self._match_id(url)
        video_meta = self._download_json(
            f'https://api.chzzk.naver.com/service/v2/videos/{video_id}', video_id,
            note='Downloading video info', errnote='Unable to download video info')['content']
        formats, subtitles = self._extract_mpd_formats_and_subtitles(
            f'https://apis.naver.com/neonplayer/vodplay/v1/playback/{video_meta["videoId"]}', video_id,
            query={