About This App

Your favorite music video, a treasured home recording, or a beloved VHS tape from years ago. "The performance is perfect, but the sound quality is lacking." To all creators and video lovers who have felt this—VideoSoundRefiner is built for you.

● "The bass disappears on my phone speakers."
Even the best bass line can't be heard on small transducers. VideoSoundRefiner uses psychoacoustic synthesis to make the low-end audible on any device.
● "Old music videos sound quiet and thin compared to modern releases."
Legacy recordings often lack the density of modern masters. Our look-ahead maximizer boosts loudness without sacrificing signal integrity.
● "The vocals sound muffled or under a blanket."
Traditional EQ often makes things harsh. Our harmonic exciter restores the lost air and high-end detail, making vocals clear and immediate.
● "Instruments are clumping together in the center."
When recordings lack separation, they sound small. Our spectral unmasking technology gives every instrument its own space.

Unlike static filters, VideoSoundRefiner lets you hear every change instantly. Adjust any parameter while your video plays and hear the effect update in real time—no re-exporting needed.

VideoSoundRefiner is a high-precision DSP utility that analyzes and optimizes the audio track of your video with objective accuracy.
● Harmonic Excitation & Spectral Shaping
High-pass filtering and polynomial soft-clipping synthesize high-frequency harmonics, restoring clarity without the phase distortion of traditional EQ.
● Psychoacoustic Bass Enhancement
Uses "Missing Fundamental" theory to generate sub-harmonics, letting low frequencies be perceived on small transducers without exceeding their mechanical limits.
● Look-ahead Peak Limiting (Maximizer)
A 5ms look-ahead limiter with adjustable input gain and ceiling, using an intelligent release curve to increase density while preventing digital clipping.
● Instrument Separation & Spectral Unmasking
WOLA synthesis and spectral contrast enhancement exaggerate panning differentials above 600Hz, reducing masking and improving instrument definition.
● Advanced Formant Detail Controls
Fine-tune formant shifting with Cepstral Envelope Fade, High-Frequency Protection, and Low-Energy Frame Bypass for precise, natural-sounding pitch and voice transformation.
● Precision Manual Control
Every DSP module is adjustable via precision sliders: Drive/Mix for Harmonic Exciters, Input Gain/Ceiling for Limiters, Pitch and Formant shift ratios, and spectral separation intensity.

・Music Video Enthusiasts: Enhance your favorite MVs for a richer listening experience.
・VHS & Legacy Restoration: Dramatically improve the sound of degraded, tape-era music videos.
・Mobile Playback Optimization: Automatically balance frequency range for clear sound on phone speakers.
・Content Creation: Polish voiceovers and dialogue for consistent loudness and clarity.

・Harmonic Exciter (High-frequency synthesis)
・Sub-Bass Restoration & Virtual Bass (Psychoacoustic processing)
・Drive & Saturation (Non-linear signal enrichment)
・Spectral Noise Removal (FFT-based subtraction)
・Stereo Imaging Expansion (Correlation-based widening)
・Pitch-Shift & Formant Shift (Granular/Phase-vocoder algorithms)
・Real-Time Playback Preview (Powered by ExoPlayer)
・AI-Based Parameter Recommendation (Waveform-driven analysis)

VideoSoundRefiner provides a transparent, controllable environment for video audio engineering on the go—delivering studio-standard DSP for your video's sound, right on your phone.

- AndroidX Media3 (including ExoPlayer)
Licensed under the Apache License, Version 2.0 (the "License").
You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0