MKVToolNix是一款功能强大的mkv格式制作和处理的工具，支持将多种视频、音频、字幕等格式封装成mkv格式。支持简体中文界面。安装版绿色版随你挑！

更新日志：https://mkvtoolnix.download/doc/NEWS.md
# Version 61.0.0 “So” 2021-08-30

## New features and enhancements

* all: IETF BCP 47/RFC 5646 language tags: implemented support for officially
registered IANA language tag extensions.
* mkvmerge: track selection: when using language tags for selecting which
tracks to keep, mkvmerge will now use component-based language tag matching
instead of comparing them verbatim. This means that only those components
(language, region etc.) the user specified will be required to exist and be
equal. For example, if a file contains three subtitle tracks with languages
`es` (generic Spanish), `es-MX` (Spanish as spoken in Mexico) and `es-ES`
(Spanish as spoken in Spain), the user can use `–stracks es` to match all
three tracks or be more specific with e.g. `–stracks es-MX` which would
only match one track. Similarly inverting the selection with e.g. `–stracks
!es` would get rid of all three tracks, not just the one for the generic
Spanish.
* MKVToolNix GUI: multiplexer: deriving track languages from file names: the
GUI can now detect full BCP 47/RFC 5646 language tags in file names. Part of
the implementation of #3173.
* MKVToolNix GUI: multiplexer: deriving track languages from file names: the
default list of boundary characters now includes `-`. Part of the
implementation of #3173.
* MKVToolNix GUI: multiplexer: the GUI now defaults to the “lower” process
priority setting for new installations in order to leave more room for other
applications, especially interactive ones. Up to and including v59 the
default was the “normal” process priority. v60 changed that to “lowest”,
which turned out to be much slower on Windows for no real gain over
“lower”. The setting will be auto-corrected by the GUI if the settings file
were saved last with a version between v60.0.0.0 & v60.0.0.17 & “lowest” &
it is still set to “lowest”.
* HEVC dumper development tool: the tool has been renamed to `xvc_dump` and
extended to be able to dump AVC/H.264 bitstreams, too. It now also detects
the type of bitstream framing (ISO 14496-15 vs. ITU-T H.264/H.265 Annex B).

## Bug fixes

* all: IETF BCP 47/RFC 5646 language tags: fixed a corner case of wrongfully
allowing scripts/variants not listed in any of the entries in the prefix
list when the prefix list contains prefixes restricting scripts/variants and
a prefix solely with the language at the same time (example: the variant
`ekavsk` with its prefixes `sr`, `sr-Cyrl` and `sr-Latn` where
e.g. `sr-ekavsk` and `sr-Cyrl-ekavsk` should be allowed but not
`sr-Bali-ekavsk`).
* mkvmerge: HEVC/H.265: the frame type of B frames was often wrongfully
signalled as P frames instead, both with `BlockGroup` (missing second
references) and `SimpleBlock` (“discardable” flag not set) elements.
* mkvmerge: SSA/ASS packetizer: the frame numbers will now be re-calculated
when appending SSA/ASS tracks so that frame numbers of appended tracks are
always strictly higher than frame numbers of the track they’re appended to.
* mkvmerge, MKVToolNix GUI’s chapter editor: BCP 47/RFC 5646 language tags:
when BCP 47 language tags are used with a language code that isn’t part of
ISO 639-2, the programs will now write a legacy language element set to
`und` (“undetermined”) instead of not writing such an element at all or
writing one with an invalid code. Fixes #3174.
* mkvmerge, MKVToolNix GUI’s chapter editor: BCP 47/RFC 5646 language tags:
the programs will ensure that the legacy and IETF language elements written
will be unique within the scope of the same “chapter display” element.
* mkvinfo, MKVToolNix GUI’s info tool: in summary mode the frame type was
reported wrong for `BlockGroup` elements in which the `ReferenceBlock`
elements were located behind the `Block` element.

## Build system changes

* all: `std::codecvt_utf8` is now used instead of Boost’s
`utf8_codecvt_facet`. The bundled copy the latter in `lib/boost` has
therefore been removed.

下载地址：
32位安装版：mkvtoolnix-32-bit-61.0.0-setup.exe
32位绿色版：mkvtoolnix-32-bit-61.0.0.7z
64位安装版：mkvtoolnix-64-bit-61.0.0-setup.exe
64位绿色版：mkvtoolnix-64-bit-61.0.0.7z