SwingFiles
mkv → opusEXTRACT • Local processing

Extract audio .MKV → .OPUS

Export the audio track from the video to the target audio format. Video frames are not included in an audio output.

Output scope: Video frames are not included in an audio output.

Extract audio .MKV → .OPUS

Drop Files for Local Browser Processing

Auto-detects magic bytes • Zero daily caps • Instant ZIP & P2P Swing chaining

Target Format & Engine Parameters

EXTRACT: Export the audio track from the video to the target audio format. Video frames are not included in an audio output.

Compute Engine:

Technical Specifications: MKV (.mkv) vs OPUS (.opus)

Specification ParameterSource: .MKV (MKV)Target: .OPUS (OPUS)
Full Format NameMatroska Multimedia ContainerIETF Opus Interactive Audio
IANA MIME Typevideo/x-matroskaaudio/opus
Magic Byte Signature (Hex)1A 45 DF A34F 67 67 53
Compression & FidelityLossless SupportedLossy / Perceptual
Alpha / Transparency & DepthYUV 4:2:0 / 10-bit HDR StreamUTF-8 / Binary Structured Stream
Typical Size Reduction Ratio24:116:1
OS & Platform SupportCross-Platform via SwingFiles WebAssembly EngineCross-Platform via SwingFiles WebAssembly Engine

Processing Steps

  1. 1. Drop .MKV Files Locally
    Choose MKV (video/x-matroska) files from your device. The browser checks their type before processing.
  2. 2. Extract Locally
    Export the audio track from the video to the target audio format.
  3. 3. Save .OPUS or Swing P2P
    Download the .opus output, export a batch ZIP, or choose "Convert & Swing" to transfer it to another device.

Frequently Asked Questions

What does this MKV to OPUS route produce?

Export the audio track from the video to the target audio format. Video frames are not included in an audio output.

Does the .mkv file leave my device?

The conversion runs in your browser. Files are not uploaded to a conversion server.

Can I process large .mkv files or batches?

There is no daily conversion quota. Large files and batch size depend on available browser memory and the format engine.

Reverse Pair (OPUS-TO-MKV) & Related Format Conversions

Reverse: opus to mkv
OPUS to MKVMKV to MP3MKV to WAVMKV to FLACMKV to AAC

Same-Wi-Fi P2P Radar Discovery

Devices on the same Wi-Fi appear automatically below — zero codes needed

Scanning local Wi-Fi subnet… Open this page on another device to pair automatically
AES-256-GCM file key stays in the peer channel; compare fingerprints before transferringPeer-to-peer · live speed appears during transfer

Phone ↔ PC Room Pairing

VERIFY PEER
6-Digit Swing Room Code
---

Drop Unlimited Files to Swing (20GB+ Direct-to-Disk Stream)

Zero cloud upload caps • 64KB chunked SCTP DataChannel • 4MB backpressure • Mobile Screen WakeLock protection

Ready for zero-cloud WebRTC SCTP streaming (64KB chunks, 4MB backpressure control).
WakeLock: STANDBY