Greetings, I am having some issues trying to backup a DVD using mencoder and using the x264 options. Here is the command used: mencoder -noaspect \ -noautoexpand \ -force-avi-aspect 4:3 \ -quiet dvd://1 \ -o output1.avi \ -dvd-device U:/MyDVD \ -vobsub 999 \ -vf pullup,softskip,pp=lb,crop=704:480:14:0,scale=presize=sntsc,harddup \ -oac lavc \ -lavcopts acodec=libfdk_aac:abitrate=128 \ -channels 2 \ -ovc x264 \ -x264encopts preset=ultrafast:profile=baseline:global_header:fast_pskip=0:bitrate=1650:threads=auto The final required is an MP4 file... Therefore, knowing that mencoder is buggy (is it?) creating mp4 file, I then do as follows: ffmpeg -i output1.avi -bsf:a aac_adtstoasc -vcodec copy -acodec copy output1.mp4 But the SAR is then wrong. so I need to do this to get the final correct file: mp4box -par 1=1:1 output1.mp4 As you might imagine I wish to encode using PAR=1/1 and DAR=4:3 in the H.264 bitstream without calling mp4box , but there seem to be no way to specify that the x264 bitstream contains SAR=1/1 in mencoder, am I right? I looked at the code and could not find anything... while it seems that the x264 command line tool permits to set sar=1, am I doing something wrong here? p.s: UIltrafast setting is just for example's sake! Am I doing something wrong? Thanks in advance! Carl