feat: add empty utils.SourceMedia

pipeline/utils.py

@@ -0,0 +1,16 @@
+class SourceMedia():
+    """Source media used by eg feature extractors. This is a list of Source objects.
+
+    JSON type schema:
+    [{
+        "source": "/path/to/video.mp4",
+        "path": "/path/to/video.mp4",
+        "provider": "FileInputJSON"
+    },
+    {
+        "source": "http://example.com/video.mp4",
+        "path": "/path/to/downloaded_video.mp4",
+        "provider": "InputYAML"
+    }]
+
+    It should be possible to combine/merge/aggregate multiple SourceMedia into one