mencoder -oac lavc -ovc lavc -of lavf -lavcopts aglobal=1:vglobal=1:vcodec=mpeg4:acodec=aachttp://www.mplayerhq.hu/DOCS/HTML/zh_CN/menc-feat-handheld-psp.html
-af lavcresample=24000 -vf harddup -lavfopts
format=psp:i_certify_that_my_video_stream_does_not_use_b_frames
-ofps 30000/1001
mencoder -ofps 30000/1001 -af lavcresample=24000 -vf harddup -of lavf /
-oac lavc -ovc lavc -lavcopts aglobal=1:vglobal=1:vcodec=mpeg4:acodec=aac /
-lavfopts format=psp:i_certify_that_my_video_stream_does_not_use_b_frames /
input.video
-ooutput.psp