Added support for uploads with name prefix

pipeline/preprocessors/arec.py

@@ -23,13 +23,15 @@ class ArecProcessor(Preprocessor):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         # This regex matches the name format for the individual channel files
-        # in a capture, which is this format: 1970_12_31_23_45_00_CH?_Name.mp4
+        # in a capture, which is this format:
+        #  some-prefix_1970_12_31_23_45_00_CH?_Name.mp4
         # The above ? represents a number between 1 and 4.
-        # Capture group 1 is only there to shorten the regex.
-        # Capture group 2 capures the channel number,
-        # capture group 3 captures the channel name.
+        # Capture group 1 is there to make the upload name prefix optional
+        # Capture group 2 is only there to shorten the regex.
+        # Capture group 3 capures the channel number,
+        # capture group 4 captures the channel name.
         self.name_regex = re.compile(
-            '^\d{4}(_\d{2}){5}_CH([1-4])_([^.]+).mp4$')
+            '^([^_]+_)?\d{4}(_\d{2}){5}_CH([1-4])_([^.]+).mp4$')
 
     def validate(self, queueitem):
         if 'upload_dir' not in queueitem.keys():
@@ -78,7 +80,7 @@ class ArecProcessor(Preprocessor):
         for item in upload_dir.iterdir():
             match = self.name_regex.match(item.name)
             if match:
-                item_channel_no, item_channel_name = match.group(2, 3)
+                item_channel_no, item_channel_name = match.group(3, 4)
                 source = {'video': item.name,
                           'poster': '',
                           'playAudio': False}