AVI
AVI video containerUsed for recorded motion video with an accompanying soundtrack.
- Family
- Video
- MIME
- video/x-msvideo
Convert AVI to MKV online
To convert AVI to MKV, upload the AVI file, start the conversion and download the result: Converter.now writes an MKV with H.264 video (CRF 23) and Opus audio at 160 kbps. The first video and audio tracks are re-encoded; extra audio tracks and embedded subtitles are not copied. Both formats are lossy, so this adds a second round of compression; convert from the best original you have rather than an earlier export.
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AVI to MKV at a glance
- Converts
- AVI video container → Matroska video
- Output
- An MKV with H.264 video (CRF 23) and Opus audio at 160 kbps
- Compression
- AVI: lossy → MKV: lossy
- Engine
- FFmpeg
- Privacy
- Private download link; files are deleted after 6 hours. No account needed.
Timed-stream transcoding: How AVI becomes MKV
The picture, sound, and timing streams inside AVI is decoded first, then re-encoded into MKV's own codec and container profile. Duration typically holds steady even as compression, channel mapping, frame cadence, or auxiliary streams shift underneath it. AVI is reconstructed from RIFF indexes and interleaved chunks; codec tags, frame timing, keyframes, and audio alignment determine whether seeking remains stable. Matroska delivery can retain multiple timed tracks, languages, subtitles, chapters, and attachments, though simplified writers and browser players may use only a subset.
Decoded from an older Microsoft media container commonly paired here with Xvid video and MP3 audio. Encoded to a flexible Matroska container capable of multiple audio, video, subtitle, and attachment streams.
Need a different output? See all AVI conversion options, or check which other files convert to MKV.
Before converting a whole batch, read the difference between a container and a codec; it explains why a familiar extension can still fail to play.
→
MKV
Matroska videoDesigned for flexible multi-track video storage.
- Family
- Video
- MIME
- video/x-matroska
AVI source facts versus MKV output requirements
What can fail when AVI video container is interpreted
AVI has limited support for modern metadata, captions, variable frame rates, and some web players.
What Matroska video cannot safely promise
A simplified conversion may keep only primary streams, and many browsers do not play MKV directly.
How the MKV writer handles this route
The verified MKV profile uses H.264 video and Opus audio when those streams are present.
Checking the MKV result before you trust it
Record the AVI evidence before conversion
Test seeking and audio sync in the target player, not only the opening frame.
Test the MKV file in its receiving workflow
Inspect the stream list, subtitles, language labels, chapters, seeking, and sync.
Deciding when AVI to MKV is the right conversion
Switch to MKV only once the destination player, editor, or service has confirmed support for its exact container and codecs. If extra tracks or the original encoding must survive, AVI remains the safer choice.
What changes between the AVI model and the MKV deliverable
- The first video and audio tracks are re-encoded; extra audio tracks and embedded subtitles are not copied.
- Both formats are lossy, so this adds a second round of compression; convert from the best original you have rather than an earlier export.
- Treat AVI-specific metadata fields as optional in the MKV result until you have actually confirmed they survived.