While it could open high-resolution files, smooth playback on devices like the Nokia 5800 was typically capped at 640x360 pixels. 720p files often caused lag due to the limited processor speeds of that era.
Software decoding consumed significantly more battery than the built-in RealPlayer, making it a "heavy" app for its time. The Legacy of CoreCodec coreplayer symbian s60 v5 1
H.264 (AVC), MKV, MPEG-1, MPEG-4 Part 2 (ASP), DivX, XviD, and MJPEG. While it could open high-resolution files, smooth playback
CorePlayer remains a symbol of the "open" feel of Symbian, where enthusiasts could push their hardware to the limit to enjoy content in ways the manufacturers never originally intended. Review: CorePlayer Mobile for UIQ 3 and S60 3rd Edition While it could open high-resolution files