ffmpeg batch for video play speed

# Change batch video play speed in folder 

#!/bin/bash
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
for f in *
do
  ffmpeg -i "$f" -filter_complex "[0:v]setpts=0.625*PTS[v];[0:a]atempo=1.6[a]" -map "[v]" -map "[a]" "$f-UF.mp4"
done
IFS=$SAVEIFS


# Change batch video scale in folder

#!/bin/bash
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
for f in *
do
 ffmpeg -i "$f" -vf scale=720x480 "$f-NS.mp4"
done
IFS=$SAVEIFS