在idx文件中应该有语句指定字体的大小吧。
# 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: 720x480
# 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: 0000e1, e83f07, 000000, fdfdfd, 11eb10, ea12eb, faff1a, 095d76, 626262, b3b3b3, 701f03, 077307, 00006c, cc0ae9, d2ab0f, 730972
# Custom colors (transp idxs and the four colors)
custom colors: OFF, tridx: 1000, colors: fdfdfd, 000000, b3b3b3, b3b3b3
# Language index in use
langidx: 0
