Since MediaCoder 0.7.3, multi-threaded version of MPlayer and MEncoder are included in the full pack distribution (in the past only included in optimization packs). However, as the MT version of MPlayer/MEncoder is still experimental, its inclusion brings some problems with MediaCoder. Decoding of Some H.264 files (mainly MKV) is blocked sometimes. If you encounter this issue, a workaround is to disabling multi-threaded decoding. You can do this by clicking Source button on Video tab. A pop up dialog should display the options of MEncoder and clicking “Decoding threads” and put a value of 1 (meaning single thread) in the blank at the bottom of the dialog.MediaCoder 0.7.3刚发布了几个星期，一些用户发现新版本没有过去稳定。经过调查，发现主要问题是因为新版本采用了多线程版的MPlayer来进行H.264解码，而这个多线程版本目前还不是非常稳定，过去只在处理器优化包中包含。主要现象是解码一些H.264的MKV文件时，MediaCoder会阻塞住。如果您遇到这样的问题，一个解决方法是禁用多线程解码，具体操作如下：
- 点击“视频”栏上的“来源”按钮
- 在弹出的对话框中，选中Decoding threads选项
- 在对话框下方的值改为1（解码线程数）