add separate video loader class

recording_grouper.py

@@ -0,0 +1,27 @@
+from data.library import ArkiteData
+from string import digits as DIGITS
+
+class RecordingGrouper:
+    def __init__(self, data: ArkiteData):
+        self.data = data
+
+    def getRecordings(self):
+        for detection in self.data.detections(self.data.use_cases()):
+            for recording in detection.recordings():
+                yield recording
+
+    def getRecordingGroups(self):
+        groups = []
+        for recording in self.getRecordings():
+            # Check if last char is digit
+            name = recording.name
+            if name[-1] in DIGITS:
+                # Remove last two chars:
+                splitname = name[:-2]
+                group = next((x for x in groups if x[0] == splitname), None)
+                if group is not None:
+                    group[1].append(recording)
+                else:
+                    groups.append((splitname, [recording]))
+
+        return groups