Convert Opus Audio Codec (.opus) to Matroska Video (.mkv) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .opus file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mkv file when it's ready.
MKV (Matroska Video) is a flexible open-source multimedia container that can hold virtually any audio and video codec combination, including Opus natively. Converting Opus to MKV can be done as a simple container remux — the Opus audio stream is placed inside the Matroska container without any transcoding, preserving the original audio quality bit-for-bit.
Matroska was designed as a universal container format, and it is one of the few containers that officially supports Opus alongside Vorbis, FLAC, AAC, MP3, and dozens of other audio codecs. This makes Opus-to-MKV one of the rare conversions where the audio data passes through completely untouched.
MKV is the standard container for media libraries managed by Plex, Kodi, Emby, and Jellyfin. If you are building a media server and want to include Opus audio files alongside your video collection, packaging them in MKV ensures they appear correctly in your media server's library with proper metadata, artwork, and chapter markers.
MKV also supports multiple audio tracks, subtitles, and chapter markers in a single file — features that Opus's native Ogg container does not offer. If you need to combine Opus audio with other elements (subtitle tracks, alternative audio tracks, metadata chapters), MKV is the most capable container available.
FFmpeg remuxes the Opus audio stream directly into a Matroska (.mkv) container using stream copy (-c copy). No transcoding occurs — the Opus bitstream is preserved bit-for-bit. The MKV container adds support for Matroska metadata (tags), chapters (EditionEntry), and multiple tracks. File size increases by only a few kilobytes of container overhead.
Completely lossless. This is a container remux, not a transcode. The Opus audio bitstream inside the MKV is identical to the source. File size is virtually unchanged, differing only by the minimal Matroska container overhead.
| Device | Opus | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Opus to MKV is a lossless container remux ideal for media server integration, multi-track packaging, and chapter marker support. The Opus audio passes through untouched, making this one of the fastest and highest-quality Opus conversions available.
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| No |
| Tính năng | Opus | MKV |
|---|---|---|
| Tên đầy đủ | Opus Audio Codec | Matroska Video |
| Phần mở rộng | .opus | .mkv |
| Phù hợp nhất cho | Low latency | Multiple audio tracks |