mp4-to-mpegdash raw script before automating

rm -rf 246 
rm -rf 426 
rm -rf 858 
rm -rf 1280 
rm -rf 1920 
mkdir 246 
mkdir 426 
mkdir 858 
mkdir 1280 
mkdir 1920 
mkdir audio 
ffmpeg -i sample.mp4 -vf scale=246:-2 -x264opts 'keyint=59:min-keyint=59:no-scenecut' -strict -2 -r 30000/1001 246/sample.mp4 -y
ffmpeg -i sample.mp4 -vf scale=426:-2 -x264opts 'keyint=59:min-keyint=59:no-scenecut' -strict -2 -r 30000/1001 426/sample.mp4 -y
ffmpeg -i sample.mp4 -vf scale=858:-2 -x264opts 'keyint=59:min-keyint=59:no-scenecut' -strict -2 -r 30000/1001 858/sample.mp4 -y
ffmpeg -i sample.mp4 -vf scale=1280:-2 -x264opts 'keyint=59:min-keyint=59:no-scenecut' -strict -2 -r 30000/1001 1280/sample.mp4 -y
ffmpeg -i sample.mp4 -vf scale=1920:-2 -x264opts 'keyint=59:min-keyint=59:no-scenecut' -strict -2 -r 30000/1001 1920/sample.mp4 -y
cp 1920/sample.mp4 audio/sample.mp4
cd 246; MP4Box -dash 2000 -frag 2000 -rap -frag-rap -profile onDemand sample.mp4#video;  cd ..
cd 426; MP4Box -dash 2000 -frag 2000 -rap -frag-rap -profile onDemand sample.mp4#video;  cd ..
cd 858; MP4Box -dash 2000 -frag 2000 -rap -frag-rap -profile onDemand sample.mp4#video;  cd ..
cd 1280; MP4Box -dash 2000 -frag 2000 -rap -frag-rap -profile onDemand sample.mp4#video;  cd ..
cd 1920; MP4Box -dash 2000 -frag 2000 -rap -frag-rap -profile onDemand sample.mp4#video;  cd ..
cd audio; MP4Box -dash 2000 -frag 2000 -rap -frag-rap -profile onDemand sample.mp4#audio;  cd ..

<Now we need to merge the different MPD files into One>