部分更新如下：
新特性和增强
GUI: chapter editor: added a character set selection in the preferences for text files. If a character set is selected there, it will be used instead of asking the user when opening text chapter files. Implements
GUI: multiplexer: added a column "character set" to the "tracks, chapters and tags" list view showing the currently selected character set for that track. Implements
mkvmerge: added an -engage option "all_i_slices_are_key_frames" for treating all I slices of an h.264/AVC stream as key frames in pathological streams that lack real key frames. Implements
GUI: running programs after jobs: added a new variable
mkvmerge: DVB subtitle tracks whose CodecPrivate data is only four bytes long will now be fixed up to the proper five bytes by adding the subtitling type byte.
mkvmerge: MP4 reader: "ctts" version 1 atoms are now supported.
软件详情：https://www.bunkus.org/blog/2017/02/mkvtoolnix-v9-9-0-released/
下载地址：https://mkvtoolnix.download/downloads.html
来自:开源中国社区