Bash variabes not passing from .sh properly

UltraFlux
UltraFlux used Ask the Experts™
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I am trying to use HandBrakeCLI to encode.

Everything works fine except one aspect.

INPUT=$1
EMBED=$2
WIDTH=$3
QUALITY=$4
AUDIO=$5
SUBS="$6"
DIRNAME=`dirname "$INPUT"`
FILENAME=`basename "$INPUT"`
BASENAME=${FILENAME%%.*}
FILENAME=$INPUT
HandBrakeCLI -i /www/domain.com/processing/"$FILENAME" -t 1 -c 1 -o /www/domain.com/htdocs/embed/"$EMBED".mp4 -f mp4 -r 23.976 --detelecine --decomb --denoise=weak -w "$WIDTH" --loose-anamorphic --start-at duration:300 --stop-at duration:30 --modulus 16 -e x264 -q "$QUALITY" --vfr -a 1 -E ffaac -B "$AUDIO" -6 stereo -R Auto -D 0 -x ref=6:subq=10:rc-lookahead=60:trellis=2:bframes=6:b-adapt=2:direct=auto:me=tesa:merange=24:analyse=all:psy-rd=0.40,0:deblock=1,1:aq-strength=0.6 --optimize "$SUBS"

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run code
./encode.sh videoin.mkv videoout 660 24 128 '--subtitle=1 --subtitle-forced=1 --subtitle-burn=1 --subtitle-default=1'

something is wrong with my $6 or the subtitle variable

Using HandBrakeCLI from command line I get the following:
[03:55:29]  * subtitle track 0, Unknown (id 2) Text [SSA] -> Render/Burn in, Forced Only, Default (this shows that all of the subtitles are working as expected)

Running the same command from within encode.sh
[03:56:30]  * subtitle track 0, Unknown (id 2) Text [SSA] -> Pass-Through (not working as expected)

It seems that using Handbrake from cmd line it understands the full line below
'--subtitle=1 --subtitle-forced=1 --subtitle-burn=1 --subtitle-default=1'

However, when used within encode.sh it only reads the first command --subtitle=1 and ignores the rest. Even when echoing the encode.sh everything looks correct.

Hence I am stuck and have been for days. Can anyone spot anything wrong or out of place?
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Commented:
--optimize $SUBS

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Commented:
ozo

I don't know what to say besides I hate and love you at the same time!

Thanks

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