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

Code before:
            video_id=video_id,
            note=f'Downloading {description} metadata',
            errnote=f'Unable to download {description} metadata',
            query=query)
        error = response.get('error')
        if error:
            raise ExtractorError(f'{self.IE_NAME} returned error: {error}', expected=True)
        return response.get('result')

    def _extract_thumbnails(self, thumbnails_dict):
        if not thumbnails_dict:
            return None
        thumbnails = []
        for index, thumbnail_size in enumerate(['small', 'medium', 'large']):
            thumbnail_url = thumbnails_dict.get(thumbnail_size)
            if not thumbnail_url:
                continue
            thumbnails.append({
                'url': thumbnail_url,
                'preference': index,
            })
        return thumbnails

    def _real_extract(self, url):
        container = self._get_container(url)
        stream = try_get(container, lambda x: x['media_container_streams'][0])
        media = try_get(stream, lambda x: x['stream_media'][0])
        if not media:
            raise ExtractorError('Can not extract media data.', expected=True)
        media_meta = media.get('media_meta')
        media_url, is_live = self._get_media_url(media_meta)
        video_id = media.get('media_id') or container.get('media_container_id')
        formats, subtitles = self._extract_m3u8_formats_and_subtitles(media_url, video_id, 'mp4')
        self._sort_formats(formats)
        return {
            'id': str(video_id),
            'title': container.get('media_container_name') or self._og_search_title(self._download_webpage(url, video_id)),
            'description': container.get('media_container_description'),
            'thumbnails': self._extract_thumbnails(media_meta.get('media_preview_images')),
            'timestamp': parse_iso8601(container.get('created_at')),
            'view_count': int_or_none(stream.get('stream_current_viewers' if is_live else 'stream_total_viewers')),
            'is_live': is_live,
            'formats': formats,
            'subtitles': subtitles,
        }


class WASDTVStreamIE(WASDTVBaseIE):
    IE_NAME = 'wasdtv:stream'
    _VALID_URL = r'https?://wasd\.tv/(?P<id>[^/#?]+)$'
    _TESTS = [{

Review comment (suggestion):
Not a amndatory change, but fyi, this can be simplified to:
```suggestion
        stream = traverse_obj(container, ('media_container_streams', 0))
```

Code after:
            errnote=f'Unable to download {description} metadata')
        error = response.get('error')
        if error:
            raise ExtractorError(f'{self.IE_NAME} returned error: {error}', expected=True)
        return response.get('result')

    def _extract_thumbnails(self, thumbnails_dict):
        return [{
            'url': url,
            'preference': index,
        } for index, url in enumerate(
            traverse_obj(thumbnails_dict, (('small', 'medium', 'large'),))) if url]

    def _real_extract(self, url):
        container = self._get_container(url)
        stream = traverse_obj(container, ('media_container_streams', 0))
        media = try_get(stream, lambda x: x['stream_media'][0])
        if not media:
            raise ExtractorError('Can not extract media data.', expected=True)
        media_meta = media.get('media_meta')
        media_url, is_live = self._get_media_url(media_meta)
        video_id = media.get('media_id') or container.get('media_container_id')
        formats, subtitles = self._extract_m3u8_formats_and_subtitles(media_url, video_id, 'mp4')
        self._sort_formats(formats)
        return {
            'id': str(video_id),
            'title': container.get('media_container_name') or self._og_search_title(self._download_webpage(url, video_id)),
            'description': container.get('media_container_description'),
            'thumbnails': self._extract_thumbnails(media_meta.get('media_preview_images')),
            'timestamp': parse_iso8601(container.get('created_at')),
            'view_count': int_or_none(stream.get('stream_current_viewers' if is_live else 'stream_total_viewers')),
            'is_live': is_live,
            'formats': formats,
            'subtitles': subtitles,
        }

    def _get_container(self, url):
        raise NotImplementedError('Subclass for get media container')

    def _get_media_url(self, media_meta):
        raise NotImplementedError('Subclass for get media url')


class WASDTVStreamIE(WASDTVBaseIE):
    IE_NAME = 'wasdtv:stream'
    _VALID_URL = r'https?://wasd\.tv/(?P<id>[^/#?]+)$'
    _TESTS = [{
        'url': 'https://wasd.tv/24_7',
        'info_dict': {
            'id': '559738',
            'ext': 'mp4',