To split files use avisplit like:avisplit -s 300 -i video.avi Then to burn subtitle to the video.avi:
mencoder in.mp4 -sub mysub.srt -subcp utf8 -subfont-text-scale 2 -sub-bg-color 0 -sub-bg-alpha 100 -subfont-outline 1 -ovc xvid -oac mp3lame -xvidencopts pass=1 -o out.mp4
Note: You need to either import a proper ttf file to your ~/.mplayer OR symlink the folder to a ttf file in /usr/share/fonts. (Doc)
