Convert MTS to MKV — Free Online Converter
Convert AVCHD Video (.mts) to Matroska Video (.mkv) online for free. Fast, secure video conversion with no watermarks or registration....
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如何转换
Upload your .mts 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.
About MTS to MKV Conversion
MKV (Matroska Video) is the most flexible open container format available, supporting virtually unlimited audio, subtitle, and chapter tracks with any codec combination. MTS/AVCHD files use the MPEG-2 Transport Stream container which, while functional, lacks support for embedded subtitles, multiple audio tracks, and chapter navigation. Converting MTS to MKV preserves or enhances the video while unlocking modern container capabilities.
Why Convert MTS to MKV?
Media server software (Plex, Jellyfin, Kodi, Emby) works best with MKV because it can extract and present multiple audio tracks, subtitle streams, and chapter markers to the viewer. AVCHD's MTS container supports none of these features. Converting camcorder footage to MKV enables adding subtitle tracks (for multilingual distribution), embedding chapter markers (for navigating long events), and carrying multiple audio mixes (original, commentary, music-only).
MKV also supports modern codecs that outperform AVCHD's H.264 encoding. Transcoding to H.265 or AV1 within MKV can reduce file sizes by 40-60% while maintaining or improving visual quality. For media library management, MKV's rich metadata and flexible structure make it the container of choice.
Common Use Cases
- Building Plex/Jellyfin libraries from AVCHD camcorder footage with proper metadata
- Adding subtitles and chapter markers to camcorder event recordings
- Transcoding AVCHD to H.265 in MKV for efficient storage of large video archives
- Combining multiple AVCHD audio tracks (different microphones) into a single MKV file
- Archiving camcorder footage in a future-proof container that supports any codec
How It Works
For a fast remux preserving the H.264 stream: `-c:v copy -c:a copy -f matroska`. Note that deinterlacing requires re-encoding: `-vf yadif -c:v libx264 -crf 20 -c:a aac -b:a 192k`. For H.265: `-vf yadif -c:v libx265 -crf 24 -c:a aac -b:a 192k`. MKV supports adding external subtitles: `-i subs.srt -c:s srt`. Use MKVToolNix post-conversion to add, remove, or reorder tracks.
Quality & Performance
Remuxing (stream copy) preserves exact AVCHD quality with zero loss. Re-encoding to H.264 CRF 20 is visually lossless. H.265 at CRF 24 matches H.264 CRF 20 quality at 30-40% smaller file sizes. The main quality improvement comes from deinterlacing, which eliminates combing artifacts on progressive displays.
Device Compatibility
| Device | MTS | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use remux (stream copy) for speed when you do not need deinterlacing or compression — it takes seconds
- 2Add chapter markers at clip boundaries when merging multiple MTS files into one MKV
- 3Include both AC3 (original surround) and AAC (compatible stereo) audio tracks for maximum playback flexibility
- 4Use MKVToolNix after conversion to fine-tune track order, default tracks, and metadata without re-encoding
- 5For Plex/Jellyfin, name files as 'Title (Year).mkv' for automatic metadata matching and artwork fetching
Related Conversions
MTS to MKV conversion upgrades AVCHD camcorder recordings into the most versatile container format, enabling rich metadata, multiple tracks, and modern codec options for media library management and long-term archival.