我是通过yum安装的mplayer+mencoder的，在执行mencoder操作时
/usr/bin/mencoder 9.flv -o testing.flv -of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec=flv:vbitrate=800:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames -srate 22050
如果有lavfopts参数就会报错提示没有这个参数，如果把这个option去掉，是以下提示，有达人能告诉我是成功了吗？最后一个提示Segmentation fault是什么意思？
MEncoder SVN-r29417-4.1.2 (C) 2000-2009 MPlayer Team
success: format: 0 data: 0x0 - 0x23bdab
libavformat file format detected.
[lavf] Video stream found, -vid 0
VIDEO: [VP6F] 436x280 0bpp 29.970 fps 409.6 kbps (50.0 kbyte/s)
[V] filefmt:44 fourcc:0x46365056 size:436x280 fps:29.970 ftime:=0.0334
** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffvp6f] vfm: ffmpeg (FFmpeg VP6 Flash)
==========================================================================
VDec: vo config request - 436 x 280 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
videocodec: libavcodec (436x280 fourcc=31564c46 [FLV1])
[VE_LAVC] High quality encoding selected (non-realtime)!
Segmentation fault
