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

Code before:
            'id': '35457073',
            'title': '1 8 岁 现 状',
            'thumbnail': 'https://tx-free-imgs.acfun.cn/newUpload/51246077_82bcf86c32c54c4d80cbd624ba4cc38c.jpeg?imageslim',
            'description': '“赶紧回去！班主任查班了！”',
            'uploader': '锤子game',
            'uploader_id': '51246077',
            'tags': ['电子竞技', 'LOL', 'CF', '搞笑', '真人'],
            'view_count': 31917,
            'like_count': 1850,
            'comment_count': 288,
            'duration': 174.208,
            'timestamp': 1656403967
        },
        'params': {
            'skip_download': 'm3u8',
        },
    }]

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

        webpage = self._download_webpage(url, video_id)
        json_all = self._search_json(r'window.videoInfo\s*=\s*', webpage, 'videoInfo', video_id)

        if 'currentVideoInfo' not in json_all:
            raise ExtractorError(f'Unknown webpage json schema{bug_reports_message()}')
        video_info = json_all['currentVideoInfo']

        title = json_all.get('title', '')
        video_internal_id = traverse_obj(json_all, ('currentVideoInfo', 'id'))
        if 'videoList' in json_all and video_internal_id is not None:
            video_list = json_all['videoList']
            p_idx, p_video_info = next(
                (idx + 1, v) for (idx, v) in enumerate(video_list)
                if v['id'] == video_internal_id)

            if len(video_list) > 1:
                title = f'{title} P{p_idx:02d} {p_video_info["title"]}'

        return {
            'id': video_id,
            'title': title,
            'thumbnail': json_all.get('coverUrl'),
            'description': json_all.get('description'),
            'uploader': traverse_obj(json_all, ('user', 'name')),
            'uploader_id': traverse_obj(json_all, ('user', 'href')),
            'tags': traverse_obj(json_all, ('tagList', ..., 'name')),
            'view_count': int_or_none(json_all.get('viewCount')),
            'like_count': int_or_none(json_all.get('likeCountShow')),
            'comment_count': int_or_none(json_all.get('commentCountShow')),
            'http_headers': {

Review comment (bug):
Imo, this error isnt even needed. The below line will raise a good enough error for this situation. But if u want to keep it, do:
```suggestion
            raise ExtractorError('Unknown webpage json schema')
```
bug_report_message is automatically added

Code after:
            'thumbnail': r're:^https?://.*\.(jpg|jpeg)',
            'upload_date': '20220628',
            'like_count': int,
            'view_count': int,
            'comment_count': int,
            'tags': list,
        },
    }, {
        # example for len(video_list) > 1
        'url': 'https://www.acfun.cn/v/ac35468952_2',
        'info_dict': {
            'id': '35468952_2',
            'ext': 'mp4',
            'title': '【动画剧集】Rocket & Groot Season 1（2022）/火箭浣熊与格鲁特第1季 P02 S01E02 十拿九穩',
            'duration': 90.459,
            'uploader': '比令',
            'uploader_id': '37259967',
            'upload_date': '20220629',
            'timestamp': 1656479962,
            'tags': list,
            'like_count': int,
            'view_count': int,
            'comment_count': int,
            'thumbnail': r're:^https?://.*\.(jpg|jpeg)',
            'description': 'md5:67583aaf3a0f933bd606bc8a2d3ebb17',
        }
    }]

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

        webpage = self._download_webpage(url, video_id)
        json_all = self._search_json(r'window.videoInfo\s*=\s*', webpage, 'videoInfo', video_id)

        title = json_all.get('title')
        video_list = json_all.get('videoList') or []
        video_internal_id = traverse_obj(json_all, ('currentVideoInfo', 'id'))
        if video_internal_id and len(video_list) > 1:
            part_idx, part_video_info = next(
                (idx + 1, v) for (idx, v) in enumerate(video_list)
                if v['id'] == video_internal_id)
            title = f'{title} P{part_idx:02d} {part_video_info["title"]}'

        return {
            **self._extract_metadata(video_id, json_all['currentVideoInfo']),
            'title': title,
            'thumbnail': json_all.get('coverUrl'),
            'description': json_all.get('description'),
            'uploader': traverse_obj(json_all, ('user', 'name')),
            'uploader_id': traverse_obj(json_all, ('user', 'href')),
            'tags': traverse_obj(json_all, ('tagList', ..., 'name')),