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Author: Technical Brief Date: April 14, 2026 Software Version: MPC-HC 2.x (based on LAV Filters) 1. Abstract Media Player Classic Home Cinema (MPC-HC) allows users to increase or decrease playback speed. However, traditional speed change raises pitch (like the “chipmunk” effect) when speeding up. This paper outlines the methods to enable time-stretching (tempo change without pitch alteration) using internal audio renderer settings and external audio processing via LAV Filters. 2. Problem Statement The default audio renderer in MPC-HC, when coupled with standard decoders (e.g., MPEG-1/2 Audio Layer III), resamples audio by dropping or repeating samples. This naive approach changes both playback speed and pitch according to the formula: mpc hc speed up without pitch
[ f_\textnew = f_\textoriginal \times \textspeed factor ] End of paper