ffsubsync is a subtitle synchronization tool that aligns subtitle timestamps to audio tracks or reference files using voice activity detection and FFmpeg. It functions as an audio-based subtitle aligner that analyzes speech patterns within a video audio stream to correct timing.
The system provides capabilities for cross-language subtitle synchronization, allowing an unsynchronized file to be aligned using a correctly timed subtitle file in a different language as a reference. It also includes a remote media timing engine that streams audio references from network URLs to perform synchronization without downloading full media files.
The tool covers a broad range of media processing tasks, including audio track synchronization via voice activity detection and reference-based timing alignment using cross-correlation signal matching.
