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#!/bin/bash

# script to reduce the size of video files

# first parameter is filename

# second parameter is target size in MBs

# requirement

# sudo apt install ffmpeg

# target size MB

TARGETMB=$2

# calculate the duraion in secs

DURATION=$(ffmpeg -i $1 2>&1 | grep Duration | cut -d ' ' -f 4 | sed s/,//)

HOUR=$(echo $DURATION | awk -F: '{print $1}')

MIN=$(echo $DURATION | awk -F: '{print $2}')

SEC=$(echo $DURATION | awk -F: '{print $3}' | awk -F. '{print $1}')

echo "$HOUR hours $MIN mins $SEC secs"

TOTALSEC=$(($((HOUR*3600))+$((MIN*60))+SEC))

echo "$TOTALSEC secs"

# calculate the bitrate in kbits per sec

TARGETBIT=$((TARGETMB*8*1024*1024))

echo "$TARGETMB MByte is $TARGETBIT bits"

BITRATE=$((TARGETBIT/TOTALSEC/1024))

echo "Script will convert the file with $BITRATE kbits per sec bitrate"

# run the program and out to a new file with '_'

ffmpeg -i $1 -b ${BITRATE}k _$1