This bash script will take a video, trim it, create a image sequence and create JS file with Base64 versions of the images.

TrimVideoToBase64.sh

#!/bin/bash
# Use > 1 to consume two arguments per pass in the loop (e.g. each
# argument has a corresponding value to go with it).
# Use > 0 to consume one or more arguments per pass in the loop (e.g.
# some arguments don't have a corresponding value to go with it such
# as in the --default example).
# note: if this is set to > 0 the /etc/hosts part is not recognized ( may be a bug )

while [[ $# > 1 ]]
do
key="$1"

echo "usage is -o ORIGNALVIDEO -f FILETOMAKE -s start -e end";
# ./cutVideoToImg.sh -o trailer.mp4 -f carlos.mp4 -s 00:00:30 -e 1

rm carlos.mp4;
rm vidData.js;
rm -rf img/;

case $key in
    -o|--original)
    ORIGINAL="$2"
    shift # past argument
    ;;
    -f|--file)
    FILE="$2"
    shift # past argument
    ;;
    -s|--start)
    START="$2"
    shift # past argument
    ;;
    -e|--end)
    END="$2"
    shift # past argument
    ;;
    --default)
    DEFAULT=YES
    ;;
    *)
            # unknown option
    ;;
esac
shift # past argument or value
done
echo ORIGINAL = "${ORIGINAL}"
echo FILE   = "${FILE}"
echo START  = "${START}"
echo END    = "${END}"
# trim a clip of video
`ffmpeg -i "${ORIGINAL}" -ss "${START}" -t "${END}" -vcodec libx264 -crf 24 -vf scale=1024:512 -async 1 "${FILE}"`
# `ffmpeg -i "${ORIGINAL}" -ss "${START}" -t "${END}" -vcodec libx264 -crf 24 -vf scale=1024:-1 -async 1 "${FILE}"`
# make img directory
`mkdir img`
# use trimed file to make image sequence
`ffmpeg -i "${FILE}" -q:v 9 img/image%03d.jpg`
# count how many images there are in /img

NUM=`ls -l img* | wc -l`
d=2;
TOTAL="$((NUM - d))";

echo "number of images create was ${TOTAL}";

FILES=img/*
start='"'; 
end='",';

find . -iname "*.jpg" -exec jpegoptim --strip-all -m100 -o -p  {} \

echo "/////////////////////////////===================";

# done
echo "var info=[{start:0,end:${TOTAL},total:${TOTAL}}]; var imgs2 = [" >> vidData.js

for f in `ls $FILES | sort -g`
do
    # take action on each file. $f store current file name
    echo "Processing $f file..."
    # echo ""[data:image/jpeg;base64,"`openssl base64 -in $f` '\n' ]"
    TEMP="data:image/jpeg;base64,"`base64 -in $f`;
    PAYLOAD="${start}${TEMP}${end}" 
    echo ${PAYLOAD} >> vidData.js
done
echo "];" >> vidData.js
cp vidData.js base64demo/json/
echo "Finished creating Base64 JS file."