Convert M4V to MKV — Free Online Converter
Convert MPEG-4 Video (Apple) (.m4v) to Matroska Video (.mkv) online for free. Fast, secure video conversion with no watermarks or registration....
2M+ ไฟล์ที่แปลงแล้ว
ผู้ใช้หลายพันคนไว้วางใจ
ถ่ายโอนอย่างปลอดภัย
อัปโหลดเข้ารหัส HTTPS
ความเป็นส่วนตัวมาก่อน
ไฟล์ถูกลบอัตโนมัติหลังการประมวลผล
ไม่ต้องลงทะเบียน
เริ่มแปลงได้ทันที
ใช้ได้ทุกที่
ทุกเบราว์เซอร์ ทุกอุปกรณ์
วิธีแปลง
Upload your .m4v 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 M4V to MKV Conversion
M4V is Apple's MPEG-4 container with optional DRM support, while MKV (Matroska Video) is an open, highly flexible container format that can hold virtually any combination of video, audio, and subtitle streams. MKV supports advanced features like multiple audio tracks, soft subtitles in numerous formats (SRT, ASS, PGS), chapter markers, and attachments — all in a single file. Converting M4V to MKV unlocks these capabilities for use with media servers like Plex, Jellyfin, and Kodi.
Why Convert M4V to MKV?
MKV is the preferred container for media server ecosystems and enthusiast video collections. It supports features that MP4/M4V cannot: unlimited audio and subtitle tracks, fonts for styled subtitles, chapter markers with named sections, and nearly every video and audio codec ever created. If you are building a Plex or Jellyfin library from Apple content, MKV is the standard container that these systems handle best.
Common Use Cases
- Building a Plex or Jellyfin media library from Apple TV and iTunes M4V content
- Adding multiple subtitle tracks or audio languages to previously Apple-only content
- Preserving M4V content in an open container format for long-term archival
- Combining M4V video with external SRT subtitle files into a single MKV
- Remuxing M4V for use with Kodi, VLC, or mpv media players on any platform
How It Works
FFmpeg remuxes the M4V content into the Matroska container, typically using stream copy for both video (H.264) and audio (AAC) to avoid re-encoding. The H.264 and AAC streams are fully compatible with MKV, so this is a fast container-swap operation. Additional subtitle tracks can be merged in the same pass. MKV's header structure is more efficient for seeking than M4V, and the container adds no overhead compared to MPEG-4.
Quality & Performance
When using stream copy (recommended), there is zero quality loss — the video and audio bitstreams are transferred identically. MKV is purely a container change; it does not affect the encoded content. File sizes are nearly identical to the source M4V, often slightly smaller due to MKV's efficient header format.
Device Compatibility
| Device | M4V | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | 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 stream copy mode (-c copy) for instant, lossless remuxing — no re-encoding needed since MKV supports H.264 and AAC natively
- 2Add chapter markers to the MKV if the original M4V contained chapters — MKV's chapter format is more feature-rich
- 3Merge external subtitle files during conversion with -i subs.srt to create a self-contained MKV
- 4For Plex/Jellyfin, name the MKV file using the pattern 'Movie Name (Year).mkv' for automatic metadata matching
- 5MKV supports multiple audio tracks — include all language tracks from the M4V for a complete media library entry
Related Conversions
M4V to MKV conversion is a fast, lossless container swap that unlocks MKV's superior subtitle support, multi-track capabilities, and media server compatibility. It is the ideal conversion for anyone moving Apple content into a platform-agnostic media library.