MKVtoolnix е комплект от инструменти за създаване и промяна на MKV файлове. Приложението е comand-line базирано, но Windows версията има графичен интерфейс, наречен MKVmerge GUI.

Има невероятен списък от поддържани входни формати. Въпреки че това приложение е повече за напреднали потребители, всеки може да го използва за да извърши основните задачи. Например, когато добавите видео файл, MKVtoolnix ще ви върне колко части съдържа файла. Например за XVID клип ви връща XVID видео част и AC3 аудио част. Когато сте готови да преобразувате файлове в MKV, просто натиснете бутона Start muxing, в долния край на страницата.

Тази безплатна програма има опции за субтитри, видео, аудио и настройки, специфични за формата. Накратко, MKVtoolnix може да предложи много функционалност, но относно видео файлове наистина може да оцените нейните възможности.

MKVToolnix е пакет с инструменти за работа с контейнер формата Matroska (MKA и MKV) и по-точно събиране на отделни потоци (видео, аудио, субтитри и др.) в съответния формат и разцепване на даден MKA/MKV файл на съставните му потоци. Програмата предлага пълно възползване от възможностите на Matroska формата: вграждане на повече от един потоци за видео, аудио и субтитри, вграждане на шрифтове и други файлове, разцепване, създаване на т.нар chapter-и и др. Лиценз: Безплатен GPL.

Промени в MKVToolnix 50.0.0:

## New feature: IETF BCP 47 language tags

* I’ve written up a [nice FAQ

entry](https://gitlab.com/mbunkus/mkvtoolnix/-/wikis/Languages-in-Matroska-and-MKVToolNix)

about the switch to using IETF BCP 47 language tags, how they interact with

legacy language elements, how the programs actually behave and how to

disable their use if necessary.

* mkvmerge: IETF BCP 47/RFC 5646 language tags: mkvmerge will now accept full

BCP 47 language tags for all options taking a language. mkvmerge will always

write „LanguageIETF“ track header elements. If the language tag contains a

valid ISO 639-2 language code it will also set the legacy „Language“ track

header element to the included ISO 639-2 code. Part of the implementation of

#2419.

* mkvmerge: IETF BCP 47/RFC 5646 language tags: if present the „LanguageIETF“

track header element will be reported as the `language_ietf` property in

JSON identification mode. Part of the implementation of #2419.

* mkvmerge: IETF BCP 47/RFC 5646 language tags in chapters: mkvmerge will now

write „ChapLanguageIETF“ elements when creating chapter atoms, either when

reading the simple chapter format or when generating chapters due to the

`–generate-chapters` command line option. Part of the implementation of

#2419.

* mkvmerge: IETF BCP 47/RFC 5646 language tags in tags: mkvmerge will now

write „TagLanguageIETF“ elements when creating „simple tag“ elements, either

when reading tag XML files or when generating them. Part of the

implementation of #2419.

* mkvmerge: IETF BCP 47/RFC 5646 language tags: added an option

`–disable-language-ietf` that causes mkvmerge to only write the legacy

language elements.

* mkvmerge, mkvpropedit, MKVToolNix GUI’s chapter editor: IETF BCP 47/RFC 5646

language tags in chapters: when reading XML chapter files the programs will

now add „ChapLanguageIETF“ elements for atoms that don’t contain them. The

values are derived from existing „ChapterLanguage“ elements. Part of the

implementation of #2419.

* mkvpropedit: IETF BCP 47/RFC 5646 language tags: setting/deleting the track

language now acts on both the old language element as well as the

„LanguageIETF“ track header element. Part of the implementation of #2419.

* mkvpropedit: IETF BCP 47/RFC 5646 language tags: added an option

`–disable-language-ietf` that causes mkvpropedit to apply changes to the

`language` track header property only to the legacy language track header

element.

* mkvinfo: IETF BCP 47/RFC 5646 language tags: added support for the

„LanguageIETF“ track header element. Part of the implementation of #2419.

* MKVToolNix GUI: multiplexer: added full support for IETF BCP 47/RFC 5646

language tags for both track and chapter languages. Part of the

implementation of #2419.

* MKVToolNix GUI: chapter: added full support for IETF BCP 47/RFC 5646

language tags for chapter languages. Part of the implementation of #2419.

* MKVToolNix GUI: header editor: added full support for IETF BCP 47/RFC 5646

language tags for track header languages. The header editor allows editing

of the legacy language elements and the IETF BCP 47 language elements

independent of each other. Part of the implementation of #2419.

## Other new features and enhancements

* mkvmerge: the chapter generation mode `when-appending` now also works with

the splitting modes `parts:` & `parts-frames:` when using the `…,+…` syntax

for appending other sections of the source file to the same destination

file. Implements #2898.

* MKVToolNix GUI: multiplexer: the file selection dialogs now include the

extension `.dtsma` for DTS files. Implements #2901.

* mkvmerge: MP4 reader: sped up parsing MP4 DASH files with a lot of segments

(`trun` atoms) quite a bit. Part of the fix of #2900.

* The PCRE2 regular expression library is now used instead of `std::regex` for

big performance improvements in all places where regular expressions are

used for parsing big chunks of text, e.g. in the subtitle parsers. Part of

the fix of #2899.

* all programs: Windows: all programs now support long file names on Windows

10 release 1604 if they’re turned on in the registry. Implements #2916.

## Bug fixes

* MKVToolNix GUI: preferences: under certain conditions changing the selected

entry in the page tree on the left did not cause the page shown on the right

to be updated. Fixes #2895.

* mkvmerge: splitting text by a fixed string (e.g. `,`) is now done by using

`std::string.find()` instead of using a regular-expression-based text

splitting function, greatly improving its performance. Part of the fix of

#2899.

* mkvmerge: mkvmerge will now read-buffer file I/O when probing text file

formats which increases its speed significantly on Windows. Part of the fix

of #2899.

* mkvmerge: MP4 reader: fixed handling of `tkhd` atoms of version 1. Fixes

#2900.

## Build system changes

* The PCRE2 library (the 8-bit variant) is now required.

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