VOBsub

• Extensions: .idx AND .sub
• Website: http://sourceforge.net/projects/guliverkli
• Specs:

VOBsub extracts the DVD subtitles raw PES from a DVD and dumps this to a .sub file. It also creates a .idx Index file with the times and byteoffsets for each and every single subtitle. The format has support for multiple tracks and can also be embedded in MP4 (by Nero) and Matroska files.

A typical VobSub .idx file looks like:

# VobSub index file, v7 (do not modify this line!)
# 
# To repair desyncronization, you can insert gaps this way:
# (it usually happens after vob id changes)
# 
#	 delay: [sign]hh:mm:ss:ms
# 
# Where:
#	 [sign]: +, - (optional)
#	 hh: hours (0 <= hh)
#	 mm/ss: minutes/seconds (0 <= mm/ss <= 59)
#	 ms: milliseconds (0 <= ms <= 999)
# 
#	 Note: You can't position a sub before the previous with a negative value.
# 
# You can also modify timestamps or delete a few subs you don't like.
# Just make sure they stay in increasing order.


# Settings

# Original frame size
size: 720x576

# Origin, relative to the upper-left corner, can be overloaded by aligment
org: 0, 0

# Image scaling (hor,ver), origin is at the upper-left corner or at the alignment coord (x, y)
scale: 100%, 100%

# Alpha blending
alpha: 100%

# Smoothing for very blocky images (use OLD for no filtering)
smooth: OFF

# In millisecs
fadein/out: 50, 50

# Force subtitle placement relative to (org.x, org.y)
align: OFF at LEFT TOP

# For correcting non-progressive desync. (in millisecs or hh:mm:ss:ms)
# Note: Not effective in DirectVobSub, use "delay: ... " instead.
time offset: 0

# ON: displays only forced subtitles, OFF: shows everything
forced subs: OFF

# The original palette of the DVD
palette: 000000, 828282, 828282, 828282, 828282, 828282, 828282, ffffff, 828282, bababa, 828282, 828282, 828282, 828282, 828282, 828282

# Custom colors (transp idxs and the four colors)
custom colors: OFF, tridx: 1000, colors: 000000, bababa, 828282, 000000

# Language index in use
langidx: 0

# English
id: en, index: 0
# Decomment next line to activate alternative name in DirectVobSub / Windows Media Player 6.x
# alt: English
# Vob/Cell ID: 1, 1 (PTS: 0)
timestamp: 00:01:25:880, filepos: 000003800
timestamp: 00:01:46:160, filepos: 000008000
timestamp: 00:02:08:880, filepos: 00000c800
# Vob/Cell ID: 1, 2 (PTS: 222840)
timestamp: 00:03:58:800, filepos: 000011000
timestamp: 00:04:00:680, filepos: 000016800
timestamp: 00:04:04:640, filepos: 00001d800