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

Code before:
        'url': 'https://www.mojevideo.sk/video/2cbeb/trailer_z_avengers_infinity_war.html',
        'only_matching': True,
    }]

    def _real_extract(self, url):
        page_id, display_id = self._match_valid_url(url).groups()
        webpage = self._download_webpage(url, page_id)

        video_id = self._search_regex(r'\bvId\s*=\s*(\d+)', webpage, 'video id')
        video_exp = self._search_regex(r'\bvEx\s*=\s*["\'](\d+)', webpage, 'video expiry')
        video_hashes = self._search_json(
            r'\bvHash\s*=\s*', webpage, 'video hashes', video_id,
            contains_pattern=r'\[.+\]', transform_source=js_to_json)

        formats = []
        for video_hash, (quality, (idx, format_note)) in zip(video_hashes, {
            '': (1, 'normálna kvalita'),
            '_lq': (0, 'nízka kvalita'),
            '_hd': (2, 'HD-720p'),
            '_fhd': (3, 'FULL HD-1080p'),
            '_2k': (4, '2K-1440p'),
        }.items()):
            formats.append({
                'format_id': f'mp4-{idx}',
                'format_note': format_note,
                'url': f'https://cache01.mojevideo.sk/securevideos69/{video_id}{quality}.mp4?md5={video_hash}&expires={video_exp}',
            })

        return {
            'id': video_id,
            'display_id': display_id,
            'formats': formats,
            'title': self._og_search_title(webpage, default=None)
            or remove_end(self._html_extract_title(webpage, 'title'), ' - Mojevideo'),
            'description': self._og_search_description(webpage),
            **self._search_json_ld(webpage, video_id, default={}),
        }


Review comment (performance):
```suggestion
                'url': f'https://cache01.mojevideo.sk/securevideos69/{video_id}{suffix}.mp4?md5={video_hash}&expires={video_exp}',
```

Code after:
        'url': 'https://www.mojevideo.sk/video/2cbeb/trailer_z_avengers_infinity_war.html',
        'only_matching': True,
    }]

    def _real_extract(self, url):
        video_id, display_id = self._match_valid_url(url).groups()
        webpage = self._download_webpage(url, video_id)

        video_id_dec = self._search_regex(
            r'\bvId\s*=\s*(\d+)', webpage, 'video id', fatal=False) or str(int(video_id, 16))
        video_exp = self._search_regex(r'\bvEx\s*=\s*["\'](\d+)', webpage, 'video expiry')
        video_hashes = self._search_json(
            r'\bvHash\s*=', webpage, 'video hashes', video_id,
            contains_pattern=r'\[(?s:.+)\]', transform_source=js_to_json)

        formats = []
        for video_hash, (suffix, quality, format_note) in zip(video_hashes, [
            ('', 1, 'normálna kvalita'),
            ('_lq', 0, 'nízka kvalita'),
            ('_hd', 2, 'HD-720p'),
            ('_fhd', 3, 'FULL HD-1080p'),
            ('_2k', 4, '2K-1440p'),
        ]):
            formats.append({
                'format_id': f'mp4-{quality}',
                'quality': quality,
                'format_note': format_note,
                'url': update_url_query(
                    f'https://cache01.mojevideo.sk/securevideos69/{video_id_dec}{suffix}.mp4', {
                        'md5': video_hash,
                        'expires': video_exp,
                    }),
            })

        return {
            'id': video_id,
            'display_id': display_id,
            'formats': formats,
            'title': (self._og_search_title(webpage, default=None)
                      or remove_end(self._html_extract_title(webpage, 'title'), ' - Mojevideo')),
            'description': self._og_search_description(webpage),
            **self._search_json_ld(webpage, video_id, default={}),
        }