As the forum area suggest I'm newbie in linux

I am on Centos playing with mencoder. I am trying to step1 (cut a file) and step2 (add subs to it).

Step 1 :-

mencoder -oac copy -ovc copy -ss 0:09:50 -endpos 0:03:50 -o part01.avi Full.avi

Step 2 :-

mencoder -vop pp=de,scale=480:360 -oac copy -ovc lavc -lavcopts keyint=25:vcodec=mpeg4:vbitrate=500:vpass=1 -sub "/files/subs.srt" -o "/subbed/part01.avi" "part01.avi"


First step works perfect, In step 2 i want to add subs only, don't change resolution, don't change codecs and instead of bitrate can i use quantizer value to achieve same quality ?

I searched over to come up with the above, It's working fully. But what I want to know is that is there any chance I can remove un-necessary parameters and merge the command to one step instead of two ?

I will really appreciate if you could explain me a bit in detail, really looking forward to learn something about it.