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

Code before:
            'upload_date': '20230328',
            'timestamp': 1680037507,
            'duration': 3716,
            'categories': ['motors'],
        }
    }]

    def _extract_from_webpage(self, url, webpage):
        viously_players = re.findall(r'<div[^>]*class="(?:[^"]*\s)?v(?:iou)?sly-player(?:\s[^"]*)?"[^>]*>', webpage)
        if not viously_players:
            return

        def custom_decode(text):
            STANDARD_ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
            CUSTOM_ALPHABET = 'VIOUSLYABCDEFGHJKMNPQRTWXZviouslyabcdefghjkmnpqrtwxz9876543210+/='
            data = base64.b64decode(text.translate(str.maketrans(CUSTOM_ALPHABET, STANDARD_ALPHABET)))
            return data.decode('utf-8').strip('\x00')

        for video_id in traverse_obj(viously_players, (..., {extract_attributes}, 'id')):
            formats = self._extract_m3u8_formats(
                f'https://www.viously.com/video/hls/{video_id}/index.m3u8', video_id, fatal=False)
            data = self._download_json(
                f'https://www.viously.com/export/json/{video_id}', video_id,
                transform_source=custom_decode, fatal=False)
            if not formats or not data:
                continue
            yield {
                'id': video_id,
                'formats': formats,
                **traverse_obj(data, ('video', {
                    'title': 'title',
                    'description': 'description',
                    'duration': ('duration', {int_or_none}),
                    'timestamp': ('iso_date', {parse_iso8601}),
                    'categories': ('category', {lambda x: [x['name']]}),
                })),
            }


Review comment (refactor):
we can still extract if we have formats w/o metadata
```suggestion
            formats = self._extract_m3u8_formats(
                f'https://www.viously.com/video/hls/{video_id}/index.m3u8', video_id, fatal=False)
            if not formats:
                continue
            data = self._download_json(
                f'https://www.viously.com/export/json/{video_id}', video_id,
                transform_source=custom_decode, fatal=False)
```

Code after:
            'upload_date': '20230328',
            'timestamp': 1680037507,
            'duration': 3716,
            'categories': ['motors'],
        }
    }]

    def _extract_from_webpage(self, url, webpage):
        viously_players = re.findall(r'<div[^>]*class="(?:[^"]*\s)?v(?:iou)?sly-player(?:\s[^"]*)?"[^>]*>', webpage)
        if not viously_players:
            return

        def custom_decode(text):
            STANDARD_ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
            CUSTOM_ALPHABET = 'VIOUSLYABCDEFGHJKMNPQRTWXZviouslyabcdefghjkmnpqrtwxz9876543210+/='
            data = base64.b64decode(text.translate(str.maketrans(CUSTOM_ALPHABET, STANDARD_ALPHABET)))
            return data.decode('utf-8').strip('\x00')

        for video_id in traverse_obj(viously_players, (..., {extract_attributes}, 'id')):
            formats = self._extract_m3u8_formats(
                f'https://www.viously.com/video/hls/{video_id}/index.m3u8', video_id, fatal=False)
            if not formats:
                continue
            data = self._download_json(
                f'https://www.viously.com/export/json/{video_id}', video_id,
                transform_source=custom_decode, fatal=False)
            yield {
                'id': video_id,
                'formats': formats,
                **traverse_obj(data, ('video', {
                    'title': ('title', {str}),
                    'description': ('description', {str}),
                    'duration': ('duration', {int_or_none}),
                    'timestamp': ('iso_date', {parse_iso8601}),
                    'categories': ('category', 'name', {str}, {lambda x: [x] if x else None}),
                })),
            }