Thanks so much.
Although I have used libavcodec version 54 to replace the downloaded android/vlc/contrib/tarballs/ffmpeg-HEAD.tar.gz to solve this problem.
I have solved the problem - "vlc: unknown option or missing mandatory argument `--avcodec-fast'" . This is just because of my lazy..... We need to build both of os and simulator once to complete the compile process. After I type ./buildMobileVLC.sh -s , the problem do not appear, so no cra...
This is caused by VLC_THREAD_ASSERT ("destroying condition"); in /vlc/src/misc/pthread.c:302 . I guess this ASSERT is only for debugging, so I can comment it first and wait until this bug fixed by Apple in the coming newer iOS version....(correct me if I am wrong) in /vlc/src/misc/pthread....