I’ve just pushed out MKVToolNix v51. As expected the new IETF BCP 47 language tag functionality introduced in v50 had a couple of bugs, which I’ve fixed in v51. Apart from that I’ve also started fuzzying mkvmerge, which turned up several issues that have also been fixed. Fuzzying will continue in the future and I fully expect a lot more bugs to be unearthed by it.
Important news for package managers is that `configure` can now detect and use a system-wide installed copy of the JPCRE2 header library. If it isn’t found, the bundled version will be used (just like in v50).
You can download the source code or one of the binaries. The Windows and macOS binaries as well as the Linux AppImage are available already. The other Linux binaries are stil being built and will be available over the course of the next couple of hours.
Here are the NEWS since the previous release:
New features and enhancements
- mkvmerge, mkvpropedit, MKVToolNix GUI: IETF BCP 47 language tags: added
missing support for UN M.49 regions for which there are no corresponding ISO
3166 alpha codes. This enables language tags such as
es-419= Spanish in
Latin America and the Caribbean. Implements #2919.
- MKVToolNix GUI: IETF BCP 47 language tags: the text in the widget displaying
the current language & the corresponding edit button is now displayed like a
link (depending on the theme: different color & underlined), making it
clearer that not just the edit button can be clicked but the text, too.
- mkvmerge: AV1 parser: fixed mkvmerge crashing after uncaught exceptions due
to certain data conditions. Found by fuzzying.
- mkvmerge: AV1 packetizer: the duration of frames wasn’t set properly. When
appending AV1 IVF or OBU files this meant that the last frame of the Nth
file and the first frame of file N+1 had the same timestamp. Fixes #2937.
- mkvmerge: DTS reader: fixed handling of buffers with an odd length when
byte-swapped DTS is detected so that mkvmerge doesn’t abort with a failed
assertion. Found by fuzzying.
- mkvmerge: h.264/AVC and h.265/HEVC elementary stream readers: mkvmerge will
no longer claim to recognize data that looks like AVC or HEVC but with
invalid video width/height values as that lead to failed assertions in
libEBML later. Found by fuzzying.
- mkvmerge: h.265/HEVC parser: fixed mkvmerge aborting after uncaught
exceptions due to certain data constellations found by fuzzying.
- mkvmerge: IVF reader: fixed mkvmerge crashing with a "division by zero"
error due to certain data conditions. Found by fuzzying.
- mkvmerge: fixed mkvmerge aborting with a "division by zero" error due to the
timestamp scaling factor being 0 after handling certain data constellations
found by fuzzying.
- mkvmerge: track statistics: fixed a "division by zero" error when the
content’s shorter than 1ms. Found by fuzzying.
- mkvmerge, mkvinfo, mkvextract, mkvpropedit: Matroska access class: fixed an
invalid memory access under certain data conditions. Found by fuzzying.
- MKVToolNix GIU: IETF BCP 47/RFC 5646 language tags: the GUI will no longer
open the language dialog when clicking on a disabled language display
- MKVToolNix GUI: IETF BCP 47 language tags: the "variants" combo-boxes were
not populated even when the language tag was valid and contained at a
variant. Fixes #2923.
- MKVToolNix GUI: IETF BCP 47 language tags: when no language is selected, at
least one of the other components (extended subtags, region, or variants)
has something selected and "private use" is not empty, the GUI would claim
this to be a valid tag, which it isn’t. Fixes #2924.
- MKVToolNix GUI: multiplexer: when the tracks/chapters/tags selection changes
from "at least one entry selected" to "no entry selected", the input
controls will be reset to their default state and not just disabled. Fixes
Build system changes
configurenow checks for the presence of the a system-wide installed copy
of the JPCRE2 C++ wrapper library for the PCRE2 library and uses that if
it’s new enough (at least v10.32.1). If not, the bundled version will be
used as a fallback. Implements #2929.