[core] Fix format string injection for metadata JSON filename message.

* Add simple extractor
* Support separate tracks
* Use index as id instead of slug

---------

Co-authored-by: dirkf <fieldhouse@gmx.net>

youtube_dl/YoutubeDL.py

@@ -2635,12 +2635,12 @@ class YoutubeDL(object):
             self.to_screen(msg('[info] %s is already present', label.title()))
             return 'exists'
         else:
-            self.to_screen(msg('[info] Writing %s as JSON to: ' + infofn, label))
+            self.to_screen(msg('[info] Writing %s as JSON to: ', label) + infofn)
             try:
                 write_json_file(self.filter_requested_info(info_dict), infofn)
                 return True
             except (OSError, IOError):
-                self.report_error(msg('Cannot write %s to JSON file ' + infofn, label))
+                self.report_error(msg('Cannot write %s to JSON file ', label) + infofn)
                 return
 
     def _write_thumbnails(self, info_dict, filename):

youtube_dl/extractor/epidemicsound.py

@@ -0,0 +1,101 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+from .common import InfoExtractor
+from ..utils import (
+    float_or_none,
+    T,
+    traverse_obj,
+    txt_or_none,
+    unified_timestamp,
+    url_or_none,
+)
+
+
+class EpidemicSoundIE(InfoExtractor):
+    _VALID_URL = r'https?://(?:www\.)?epidemicsound\.com/track/(?P<id>[0-9a-zA-Z]+)'
+    _TESTS = [{
+        'url': 'https://www.epidemicsound.com/track/yFfQVRpSPz/',
+        'md5': 'd98ff2ddb49e8acab9716541cbc9dfac',
+        'info_dict': {
+            'id': '45014',
+            'display_id': 'yFfQVRpSPz',
+            'ext': 'mp3',
+            'tags': ['foley', 'door', 'knock', 'glass', 'window', 'glass door knock'],
+            'title': 'Door Knock Door 1',
+            'duration': 1,
+            'thumbnail': 'https://cdn.epidemicsound.com/curation-assets/commercial-release-cover-images/default-sfx/3000x3000.jpg',
+            'timestamp': 1415320353,
+            'upload_date': '20141107',
+            'age_limit': None,
+            # check that the "best" format was found, since test file MD5 doesn't
+            # distinguish the formats
+            'format': 'full',
+        },
+    }, {
+        'url': 'https://www.epidemicsound.com/track/mj8GTTwsZd/',
+        'md5': 'c82b745890f9baf18dc2f8d568ee3830',
+        'info_dict': {
+            'id': '148700',
+            'display_id': 'mj8GTTwsZd',
+            'ext': 'mp3',
+            'tags': ['liquid drum n bass', 'energetic'],
+            'title': 'Noplace',
+            'duration': 237,
+            'thumbnail': 'https://cdn.epidemicsound.com/curation-assets/commercial-release-cover-images/11138/3000x3000.jpg',
+            'timestamp': 1694426482,
+            'release_timestamp': 1700535606,
+            'upload_date': '20230911',
+            'age_limit': None,
+            'format': 'full',
+        },
+    }]
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+        json_data = self._download_json('https://www.epidemicsound.com/json/track/' + video_id, video_id)
+
+        def fmt_or_none(f):
+            if not f.get('format'):
+                f['format'] = f.get('format_id')
+            elif not f.get('format_id'):
+                f['format_id'] = f['format']
+            if not (f['url'] and f['format']):
+                return
+            if f.get('format_note'):
+                f['format_note'] = 'track ID ' + f['format_note']
+            f['preference'] = -1 if f['format'] == 'full' else -2
+            return f
+
+        formats = traverse_obj(json_data, (
+            'stems', T(dict.items), Ellipsis, {
+                'format': (0, T(txt_or_none)),
+                'format_note': (1, 's3TrackId', T(txt_or_none)),
+                'format_id': (1, 'stemType', T(txt_or_none)),
+                'url': (1, 'lqMp3Url', T(url_or_none)),
+            }, T(fmt_or_none)))
+
+        self._sort_formats(formats)
+
+        info = traverse_obj(json_data, {
+            'id': ('id', T(txt_or_none)),
+            'tags': ('metadataTags', Ellipsis, T(txt_or_none)),
+            'title': ('title', T(txt_or_none)),
+            'duration': ('length', T(float_or_none)),
+            'timestamp': ('added', T(unified_timestamp)),
+            'thumbnail': (('imageUrl', 'cover'), T(url_or_none)),
+            'age_limit': ('isExplicit', T(lambda b: 18 if b else None)),
+            'release_timestamp': ('releaseDate', T(unified_timestamp)),
+        }, get_all=False)
+
+        info.update(traverse_obj(json_data, {
+            'categories': ('genres', Ellipsis, 'tag', T(txt_or_none)),
+            'tags': ('metadataTags', Ellipsis, T(txt_or_none)),
+        }))
+
+        info.update({
+            'display_id': video_id,
+            'formats': formats,
+        })
+
+        return info

youtube_dl/extractor/extractors.py

@@ -357,6 +357,7 @@ from .ellentube import (
 from .elpais import ElPaisIE
 from .embedly import EmbedlyIE
 from .engadget import EngadgetIE
+from .epidemicsound import EpidemicSoundIE
 from .eporner import EpornerIE
 from .eroprofile import EroProfileIE
 from .escapist import EscapistIE