Shell script to convert a Nintendo 3DS AVI file to an over-under DLNA-compliant NTSC MPEG-2 program stream (VOB) for viewing on some 3D TVs

3ds-to-dlna-vob.sh

#!/bin/sh
# Copyright (c) 2012 by Dean Brettle
# Licensed under the GPLv3.
# To use:
# chmod +x 3ds-to-dlna-vob.sh
# 3ds-to-dlna-vob.sh yourfile.avi

# The horizontal offset between the left and right videos of an object that
# should appear on the surface of the screen when viewed in 3D.
delta=70

reduced_width=`expr 480 - $delta`
display_width=`expr 240 \* 16 / 9`
border=`expr $display_width - $reduced_width`
border=`expr -1 \* $border / 2`
echo "border = $border"
base=`basename ${1} .AVI`
base=`basename ${base} .avi`
gst-launch filesrc location=${1} ! decodebin2 name=decode \
  decode.src1 ! queue ! alpha ! videobox left=$delta \
    ! videobox top=-240 border-alpha=0 \
  ! videomixer name=mix ! videobox left=$border right=$border \
    ! ffmpegcolorspace ! gdkpixbufscale ! videorate \
    ! 'video/x-raw-rgb,width=720,height=480,framerate=30000/1001' \
    ! ffmpegcolorspace ! mpeg2enc format=9 aspect=3 bitrate=4500 ! mpegpsmux name=mux ! filesink location=${base}.VOB \
  decode.src0 ! queue ! alpha ! videobox right=70 ! mix.  \
  decode.src2 ! queue ! audioconvert ! audioresample ! 'audio/x-raw-int,rate=48000' ! ffenc_mp2 ! mux.