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

Code before:
        'info_dict': {
            'id': 'd44e1a03-a0e5-45c2-9496-5c9fa08dc94c',
            'ext': 'ismv',
            'title': 'What is the Difference Between a Terminal and a Shell? (Part 2 of 20)',
            'description': 'md5:7bbbfb593d21c2cf2babc3715ade6b88',
            'timestamp': 1676339547,
            'upload_date': '20230214',
            'thumbnail': r're:https://learn\.microsoft\.com/video/media/.*\.png',
            'subtitles': 'count:14',
        },
    }]

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

        entry_id = self._html_search_meta('entryId', webpage, 'entryId', fatal=True)
        video_info = self._download_json(
            f'https://learn.microsoft.com/api/video/public/v1/entries/{entry_id}', video_id)
        return {
            'id': entry_id,
            'formats': self._extract_ism(video_info['publicVideo']['adaptiveVideoUrl'], video_id),
            'subtitles': self._sub_to_dict(traverse_obj(video_info, ('publicVideo', 'captions', ..., {
                'tag': ('language', {str}),
                'url': ('url', {url_or_none}),
            }))),
            'title': self._og_search_title(webpage),
            'description': self._og_search_description(webpage),
            **traverse_obj(video_info, {
                'timestamp': ('createTime', {parse_iso8601}),
                'thumbnails': ('publicVideo', 'thumbnailOtherSizes', ..., {url_or_none}, {lambda x: x and {'url': x}}),
            }),
        }


class MicrosoftLearnSessionIE(InfoExtractor):
    _VALID_URL = r'https?://learn\.microsoft\.com/(?:[\w\-]+/)?events/[\w\-]+/(?P<id>[^?#/]+)'
    _TESTS = [{
        'url': 'https://learn.microsoft.com/en-us/events/build-2022/ts01-rapidly-code-test-ship-from-secure-cloud-developer-environments',
        'info_dict': {
            'id': '9640d86c-f513-4889-959e-5dace86e7d2b',
            'ext': 'ismv',
            'title': 'Rapidly code, test and ship from secure cloud developer environments - Events',
            'description': 'md5:f26c1a85d41c1cffd27a0279254a25c3',
            'timestamp': 1653408600,
            'upload_date': '20220524',
            'thumbnail': r're:https://mediusimg\.event\.microsoft\.com/video-\d+/thumbnail\.jpg.*',
        },
    }]

    def _real_extract(self, url):

Review comment (suggestion):
filter instead of transform here, same as above

```suggestion
            'subtitles': self._sub_to_dict(traverse_obj(video_info, (
                'publicVideo', 'captions', lambda _, v: url_or_none(v['url']), {
                    'tag': ('language', {str}),
                    'url': 'url',
                }))),
```

Code after:
            'title': 'What is the Difference Between a Terminal and a Shell? (Part 2 of 20)',
            'description': 'md5:7bbbfb593d21c2cf2babc3715ade6b88',
            'timestamp': 1676339547,
            'upload_date': '20230214',
            'thumbnail': r're:https://learn\.microsoft\.com/video/media/.*\.png',
            'subtitles': 'count:14',
        },
    }]

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

        entry_id = self._html_search_meta('entryId', webpage, 'entryId', fatal=True)
        video_info = self._download_json(
            f'https://learn.microsoft.com/api/video/public/v1/entries/{entry_id}', video_id)
        return {
            'id': entry_id,
            'formats': self._extract_ism(video_info['publicVideo']['adaptiveVideoUrl'], video_id),
            'subtitles': self._sub_to_dict(traverse_obj(video_info, (
                'publicVideo', 'captions', lambda _, v: url_or_none(v['url']), {
                    'tag': ('language', {str}),
                    'url': 'url',
                }))),
            'title': self._og_search_title(webpage),
            'description': self._og_search_description(webpage),
            **traverse_obj(video_info, {
                'timestamp': ('createTime', {parse_iso8601}),
                'thumbnails': ('publicVideo', 'thumbnailOtherSizes', ..., {'url': {url_or_none}}),
            }),
        }


class MicrosoftLearnSessionIE(InfoExtractor):
    _VALID_URL = r'https?://learn\.microsoft\.com/(?:[\w-]+/)?events/[\w-]+/(?P<id>[^?#/]+)'
    _TESTS = [{
        'url': 'https://learn.microsoft.com/en-us/events/build-2022/ts01-rapidly-code-test-ship-from-secure-cloud-developer-environments',
        'info_dict': {
            'id': '9640d86c-f513-4889-959e-5dace86e7d2b',
            'ext': 'ismv',
            'title': 'Rapidly code, test and ship from secure cloud developer environments - Events',
            'description': 'md5:f26c1a85d41c1cffd27a0279254a25c3',
            'timestamp': 1653408600,
            'upload_date': '20220524',
            'thumbnail': r're:https://mediusimg\.event\.microsoft\.com/video-\d+/thumbnail\.jpg.*',
        },
    }]

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