subs - convert, join, split, and re-time subtitles
subs [options] subfile [ subfile ... ]
a and b coefficients in linear transformation u=at+b, where t and u are src and dest times ( default(identity transform) is [a=1,b=0] ). -a can be set as ratio, f.ex. 23.9/25
Use codec to write file. Run 'subs -h' for list of installed codecs.
Try to prolong duration of quickly disappearing text. 'Quickly' is less than 0.8 second per line of text.
Run perl code for each line of text in file. On each run, the text and time variables are initialized, and new values, if any, written to the file. The variables are used for:
subtitle text line
number of lines
persistent data between runs
The -e option can be specified several times
Edit files in place ( makes backup in .bak files )
Time interval between joins, seconds (default 2)
File to save processed subtitles (default out.sub)
Separate overlapped lines
Set a control point, where t1 is time of a phrase spoken in the film and t2 is time when the same phrase as appears in the subtitle. Two points are required for deducing -a and -b coefficients; if only one point is specified, it is assumed that the other one is [0,0].
Times can be relative, f.ex. -p 01:00 +3.5 -p -20 1:00:00
Options -P and -p are the same except the argument sequence is reversed. -P is to be used when arguments to -p were typed manually and in wrong order.
Restrict changes, if any, in time span t1-t2. Word 'end' can be used as an alias to the end of the file. Default values are '0' and 'end'.
Force frame-per-second rate for frame-based subs
Split in two parts by time
Zip subtitle files so time information is read from file.sub, while text information is read from the input file(s).
The time format is either [[HH:]MM:]SS[.MSEC] or subtitle format-specific
Warning: -i is a great feature, but use it with certain caution.
If subtitles are shown too early ( 5 seconds):
subs -i -b 5 file.sub
If subtitles are for a movie in 25 fps, need to be for 24 ( actual for frame-based formats only ).
subs -i -a 24/25 file.sub
If subtitles start ok, but in 1 hour are late in 7 seconds:
subs -i -p 0 0 -p 1:00:00 +7 file.sub
Join two parts with 15-second gap
subs -o joined.sub -j 15 part1.sub part2.sub
Split in two after 50 minutes and half a second ( makes basename.1.sub and basename.2.sub ).
subs -o basename.sub -s 50:00.5 toobig.sub
Remove closed caption-specific comments such as '[Sneezing]' or '[Music playing]'
subs -e 's/[\s-]*\[.*\]\s*\n*//gs' sub.sub
Subtitles written as
.smi format may differ from original.
Subtitles - backend module for this program
Dmitry Karasik, <firstname.lastname@example.org>.