How can I extract audio losslessly from a video on my windows 10 pc?

You can use the MKVToolNix GUI to extract audio from video on windows pc.

MKVToolNix GUI is a specialized application primarily designed for creating, manipulating, and inspecting Matroska (MKV) media containers. Its core strength for audio extraction lies in the multiplexer function, which can handle not just MKV files but also common formats like MP4, AVI, and MOV.

The process involves loading a source video, deselecting all video, subtitle, and chapter tracks, selecting only the desired audio stream, and then "muxing" it out into a new file, typically as an MKA (Matroska Audio) file, which is a simple container for the untouched audio stream. This ensures a mathematically lossless pathway to extract audio from video on windows, as the original audio data is copied bit-for-bit without any re-encoding.

Pros

• Guarantees a perfectly lossless extraction via direct stream copying.
• Offers precise control to select and isolate specific audio tracks from files with multiple streams.
• Handles a wide variety of audio and video source container formats (MP4, AVI, MKV, etc.).
• Completely free, open-source, and well-maintained software.

Cons

• The interface is designed for multiplexing and can feel less intuitive for simple audio extraction.
• The default output format (MKA) is less universally compatible than MP3 or AAC, though the audio inside is untouched.
• The workflow can feel indirect for a single-purpose task, as it requires manually deselecting video/subtitle tracks.