use output mode from stdin

tests/run_time_machine.py

@@ -9,6 +9,7 @@ specially when the day_start time is in the night.
 import datetime
 import os
 import sys
+from importlib import import_module
 
 import time_machine
 
@@ -22,14 +23,19 @@ sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 # set time zone
 _TZ = ZoneInfo("Europe/Berlin")
 # fake date and time
-SOURCE_TIME = [2021, 2, 14, 23, 59, 0]
+SOURCE_TIME = [2021, 6, 24, 23, 57, 30]
 
 
 @time_machine.travel(datetime.datetime(*SOURCE_TIME, tzinfo=_TZ))
 def run_in_time_machine():
-    desktop.output()
+    if stdin_args.mode:
+        output = import_module(f'ffplayout.output.{stdin_args.mode}').output
+        output()
+    else:
+        desktop.output()
 
 
 if __name__ == '__main__':
     from ffplayout.output import desktop
+    from ffplayout.utils import stdin_args
     run_in_time_machine()