ffmpeg flv & sync tips (LXF 119)

$ ffmpeg -i xxx.mpg -ar 22050 -acodec libmp3lame -ab 32K -r 25 -s 320x240
-vcodec flv xxx.flv

<4:3>
$ ffmpeg -i xxx.mpg -croptop 30 -cropbottom 30 -padtop 30 -padbottom
=padcp;pr 000000 -target ntsc-dvd ntsc.mpg


$ ffmpeg -i break.flv -vcodec mpeg2video break.m2v -acodec copy break.mp3
$ ffmpeg -i break.mp3 -itsoffset 00:00:10.2 -i break.m2v output.flv
$ ffmpeg -i break.m2v -itsoffset 00:00:00.3 -i break.mp3 output.flv