Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/tv4.py (Python)

Code before:
            'url': 'http://www.tv4play.se/sport/3060959',
            'only_matching': True,
        },
        {
            'url': 'http://www.tv4play.se/film/2378136',
            'only_matching': True,
        },
        {
            'url': 'http://www.tv4play.se/barn/looney-tunes?video_id=3062412',
            'only_matching': True,
        },
        {
            'url': 'http://www.tv4play.se/program/farang/3922081',
            'only_matching': True,
        },
        {
            'url': 'https://www.tv4play.se/program/nyheterna/avsnitt/13315940',
            'only_matching': True,
        }
    ]

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

        info = self._download_json(
            'https://playback2.a2d.tv/asset/%s' % video_id,
            video_id, 'Downloading video info JSON', query={
                'service': 'tv4',
                'device': 'browser',
                'protocol': 'hls,dash',
                'drm': 'widevine',
            })['metadata']

        title = info['title']

        manifest_url = self._download_json(
            'https://playback2.a2d.tv/play/' + video_id,
            video_id, query={
                'service': 'tv4',
                'device': 'browser',
                'protocol': 'hls',
            })['playbackItem']['manifestUrl']
        formats = []
        subtitles = {}

        fmts, subs = self._extract_m3u8_formats_and_subtitles(
            manifest_url, video_id, 'mp4',
            'm3u8_native', m3u8_id='hls', fatal=False)
        formats.extend(fmts)
        subtitles = self._merge_subtitles(subtitles, subs)


Review comment (suggestion):
use f-strings for both API URLs for consistency / readability
```suggestion
            f'https://playback2.a2d.tv/asset/{video_id}',
```

Code after:
                'ext': 'mp4',
                'title': 'Så här jobbar ficktjuvarna - se avslöjande bilder',
                'thumbnail': r're:^https?://.*\.jpg$',
                'description': 'Unika bilder avslöjar hur turisternas fickor vittjas mitt på Stockholms central. Två experter på ficktjuvarna avslöjar knepen du ska se upp för.',
                'timestamp': int,
                'upload_date': '20150130',
            },
            'skip': '404 Not Found',
        },
        {
            'url': 'http://www.tv4play.se/sport/3060959',
            'only_matching': True,
        },
        {
            'url': 'http://www.tv4play.se/film/2378136',
            'only_matching': True,
        },
        {
            'url': 'http://www.tv4play.se/barn/looney-tunes?video_id=3062412',
            'only_matching': True,
        },
        {
            'url': 'http://www.tv4play.se/program/farang/3922081',
            'only_matching': True,
        },
        {
            'url': 'https://www.tv4play.se/program/nyheterna/avsnitt/13315940',
            'only_matching': True,
        }
    ]

    def _call_api(self, endpoint, video_id, headers=None, query={}):
        return self._download_json(
            f'https://playback2.a2d.tv/{endpoint}/{video_id}', video_id,
            f'Downloading {endpoint} API JSON', headers=headers, query={
                'service': 'tv4',
                'device': 'browser',
                'protocol': 'hls',
                **query,
            })

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

        info = traverse_obj(self._call_api('asset', video_id, query={
            'protocol': 'hls,dash',
            'drm': 'widevine',
        }), ('metadata', {dict})) or {}

        manifest_url = self._call_api(
            'play', video_id, headers=self.geo_verification_headers())['playbackItem']['manifestUrl']