This article will explain the differences between the available modes for blackborder
Default: 3 scanlines in each direction (X Y) - fastest detection
Classic: The original implementation - lower cpu time (legacy for RPi 1) just scan the top one third of the picture which leads to a slow detection and trouble with TV channel logo.
OSD: Based on the default mode - not that effectiv but prevents border switching which may caused of OSD overlays (program infos and volume bar).
Pictures that explain the modes:
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