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It's quite common to have synchronization problems with subtitles files. Indeed, very often the subtitle file is not adapted to our source video file. So we usually have a delay that goes from a few milliseconds to a few seconds which can be quite annoying when playing.
It's possible, with most players (vlc, mpv or mplayer); see here; to adjust the delay, but the configuration will be lost at the next playback. So it is more interesting to be able to adjust by directly modifying the subtitle file.
And I have developed a script to do just that.
user@host:~$ ./shebangthe_srt.sh -f [srt file] -t '[+/- time]'
user@host:~$ ./shebangthe_srt.sh -f /home/std/Running.on.Empty.1988.1080p.BluRay.x264.AAC.5.1-POOP.srt -t '- 0.400'
user@host:~$ ./shebangthe_srt.sh -f /home/std/Running.on.Empty.1988.1080p.BluRay.x264.AAC.5.1-POOP.srt -t '+ 1.400'
[…] 1126 01:55:12,527 --> 01:55:14,461 I love you. 1127 01:55:20,735 --> 01:55:22,669 I really love you.
#! /bin/bash
IFS=$'\n'
option_F_found=0
option_T_found=0
usage()
{
echo "usage: ./subtitles.sh -f [srt file] -t '[+/- time]'"
echo "ex : ./subtitles.sh -f /home/std/lecuisinierlevoleursafemmeetsonamant.srt -t '- 18.100'"
echo "ex : ./subtitles.sh -f /home/std/lecuisinierlevoleursafemmeetsonamant.srt -t '+ 18.100'"
echo ""
exit 3
}
while getopts f:t: OPTNAME; do
case "$OPTNAME" in
f)
FILE="$OPTARG"
option_F_found=1
;;
t)
TIME="$OPTARG"
option_T_found=1
;;
*)
usage
;;
esac
done
if [ "$option_F_found" -eq "0" ] || [ "$option_T_found" -eq "0" ]; then
usage
fi
FunctionDuration()
{
duration_temp=$(date -d "1983-12-12 $1" "+%s.%3N")
duration_diff=$(echo "scale=3; $duration_temp $TIME" | bc -l)
duration_dest=$(date -d"@$duration_diff" "+%H:%M:%S,%3N")
echo "$duration_dest"
}
for i in $(grep -E "[0-9]{2}:[0-9]{2}\,[0-9]{3}" "$FILE");
do
A=$(echo "$i" | sed 's/\([0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}\,[0-9]\{3\}\) --> \([0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}\,[0-9]\{3\}\)/\1/')
B=$(echo "$i" | sed 's/\([0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}\,[0-9]\{3\}\) --> \([0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}\,[0-9]\{3\}\)/\2/')
VAL1=$(FunctionDuration "$A")
VAL2=$(FunctionDuration "$B")
echo "working on $A --> $B"
sed -i "s/$i/$VAL1 --> $VAL2/" "$FILE"
done
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