I would like to add one point regarding AVIs containing DV Type 1 format.

There is no proper tool in open source (as far as I know) for converting a DV Type 1 AVI to DV Type 2 AVI. The above given FAQ is the solution for this problem with one small modification.

Instead of
mencoder -o finalmovie.avi -noidx -oac copy -ovc copy concatenatedfile.avi
use
mencoder -o finalmovie.avi -noidx -oac pcm -ovc copy concatenatedfile.avi
in which the Audio codec is specified to be other than ‘copy’. This is necessary because DV Type 1 AVI has just one stream which contains both audio and video interleaved (see http://www.microsoft.com/whdc/archive/dvavi.mspx for details).

usage,

chmod +x scriptname
./scriptname [ [ -b outputfile ] input file(s) ]

function check_input {
if [ "$2" ];
then
echo “Concatenating selected files Please wait…”
cat “$@” > merged”$outputfilename”.avi
echo “Concatenation complete”
echo “Syncronizing concatenated file”
mencoder -o “$outputfilename”.avi -noidx -oac copy -ovc copy merged”$outputfilename”.avi
echo “Removing concatenated file to preserve disc space”
rm merged”$outputfilename”.avi
else
echo “Only one file for conversion, concatenation skipped”
echo “Preparing file for conversion. Please wait…”
cp “$1″ “$outputfilename”.avi
fi
}

if [ "$1" ]
then
if [ "$1" = "-b" ] && [ "$3" ]
then
for i in “${@:3:$#}”
do
echo “Checking” “$i” “exists…..”
if test -e “$i”
then
echo “….does”
else
echo “Cannot find” “$i” “Please re-check your input”
echo “Exiting….”
exit 1
fi
done
outputfilename=”$2″
inputfilename=”${@:3:$#}”
check_input ${@:3:$#}
else
for i in “$@”
do
echo “Checking” “$i” “exists…..”
if test -e “$i”
then
echo “….does”
else
echo “Cannot find” “$i” “Please re-check your input”
echo “Exiting….”
exit 1
fi
done
outputfilename=”finalmovie”
inputfilename=”$1″
check_input “$1″
fi
else
echo “ERROR: You must input at least one file for conversion!”
echo “Expected Syntax: ./mkdvd [ [ -b outputfile ] ‘file1′ ‘file2′ ‘etc..’ ]”
exit 1
fi

echo “Converting to mpg (This may take a long time…)”
ffmpeg -i “$outputfilename”.avi -y -target pal-dvd -sameq -aspect 16:9 “$outputfilename”.mpg
echo “Conversion Complete”

echo “Creating DVD files Please wait…”
dvdauthor –title -o “$outputfilename” -f “$outputfilename”.mpg
dvdauthor -o $outputfilename -T
echo “DVD file creation complete”

echo “Removing uneeded files”
rm “$outputfilename”.avi
rm “$outputfilename”.mpg

echo “Creating burnable ISO image”
mkisofs -dvd-video -o “$outputfilename”.iso $outputfilename/
echo “ISO image creation complete”
echo “Removing uneeded directory”
rm -r “$outputfilename”

read -n 1 -p “Do you wish to burn your project now? (y/n)” burn
echo “”
if [ $burn == "y" ]
then
read -n 1 -p “Have you insereted a blank disc? (y/n)” disc_inserted
echo “”
if [ $disc_inserted == "y" ]
then
growisofs -dvd-compat -dvd-video -speed=4 -Z /dev/dvd ./”$outputfilename”/*
else
echo “You may burn your project later using: ‘growisofs -dvd-compat -dvd-video -speed=4 -Z /dev/dvd ./”$outputfilename”/*’”
exit 0
fi
else
echo “You may burn your project at a later date using: ‘growisofs -dvd-compat -dvd-video -speed=4 -Z /dev/dvd ./”$outputfilename”/*’”
exit 0
fi

Thanks for a really clear guide.