| Feature | MKVToolNix GUI v7.0.0 | Modern Version (v85+) | | --- | --- | --- | | Windows 11 support | Untested, may work with compatibility mode | Full native support | | 4K/UHD muxing | No HDR metadata passthrough | Full HDR10+, Dolby Vision | | AV1 codec | Not recognized | Full support | | Blu-ray subtitles (PGS) | Limited, often out of sync | Perfect sync and conversion | | Maximum file size | 2GB? (32-bit limit on some builds) | No practical limit (64-bit) | | Dark mode UI | No | Yes (Qt6) |
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