我看到 12）matroska能够添加可变帧率(VFR)的内容吗？ 这个教程了，可打不开doom9（方正的烂网）。目前问题是用mkvmerge GUI 出现了下面的错误，应该本身应该就是VFR的MKV，现在就是想调整一下外挂字幕，其它的不动，但无法重新封装。想问一下集体到底如何操作才可重新封装。
mkvmerge output:
mkvmerge v1.8.1 ('Little By Little') built on Nov 25 2006 16:14:20
'G:\[MapleSnow_PPX]Black_Lagoon_01[DVDRip][H264_AC3][0C5B8A20].mkv': Using the Matroska
demultiplexer.
'G:\[MapleSnow_PPX]Black_Lagoon_01[DVDRip][H264_AC3][0C5B8A20].mkv' track 1: Using the text
subtitle output module.
'G:\[MapleSnow_PPX]Black_Lagoon_01[DVDRip][H264_AC3][0C5B8A20].mkv' track 2: Using the video
output module.
At the moment mkvmerge does not support converting from VfW-mode AVC/h.264 tracks to native
Matroska-mode AVC/h.264 tracks. You can, however, first import the video track into a MP4
file with e.g. 'MP4Box' (use Google). Then you can use mkvmerge and put the video into a
Matroska file.
If you're trying to get AVC/h.264 from an AVI into Matroska then the commands you need to
use are for example:
avi2raw avc.avi raw.264
mp4box -fps 23.976 -add raw.264 avc.mp4
Keep in mind to replace '-fps 23.976' with the actual frame rate of your source file.
If you really know what you are doing then you can force mkvmerge to put this AVC/h.264
track into a Matroska file even in VfW mode if you add '--engage allow_avc_in_vfw_mode' to
the command line. You can do that in mmg with the 'Add command line options' menu entry in
the 'Muxing' menu.
Errors:
Error: 'G:\[MapleSnow_PPX]Black_Lagoon_01[DVDRip][H264_AC3][0C5B8A20].mkv' track 2: You are
trying to put AVC/h.264 video from an AVI or a similar VfW (Video for Windows) compatible
source into a Matroska file in the so-called 'VfW compatibility mode'. Please note that this
is not the official way to store AVC/h.264 video in Matroska. Therefore proper playback of
such files cannot be guaranteed, and we strongly urge you to use the native Matroska-mode.
