<s>
SubRip	B-Application
is	O
a	O
free	B-Application
software	I-Application
program	O
for	O
Microsoft	B-Application
Windows	I-Application
which	O
extracts	O
subtitles	O
and	O
their	O
timings	O
from	O
various	O
video	O
formats	O
to	O
a	O
text	B-General_Concept
file	I-General_Concept
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
<s>
Its	O
subtitle	O
format	O
's	O
file	O
extension	O
is	O
.srt	B-Application
and	O
is	O
widely	O
supported	O
.	O
</s>
<s>
Each	O
.srt	B-Application
file	O
is	O
a	O
human-readable	O
file	O
format	O
where	O
the	O
subtitles	O
are	O
stored	O
sequentially	O
along	O
with	O
the	O
timing	O
information	O
.	O
</s>
<s>
Using	O
optical	B-Application
character	I-Application
recognition	I-Application
,	O
SubRip	B-Application
can	O
extract	O
from	O
live	O
video	O
,	O
video	O
files	O
and	O
DVDs	O
,	O
then	O
record	O
the	O
extracted	O
subtitles	O
and	O
timings	O
as	O
a	O
Subrip	B-Application
format	O
text	B-General_Concept
file	I-General_Concept
.	O
</s>
<s>
In	O
practice	O
,	O
SubRip	B-Application
is	O
configured	O
with	O
the	O
correct	O
codec	B-General_Concept
for	O
the	O
video	O
source	O
,	O
then	O
trained	O
by	O
the	O
user	O
on	O
the	O
specific	O
text	O
area	O
,	O
fonts	O
,	O
styles	O
,	O
colors	O
and	O
video	O
processing	O
requirements	O
to	O
recognize	O
subtitles	O
.	O
</s>
<s>
After	O
trial	O
and	O
fine	O
tuning	O
,	O
SubRip	B-Application
can	O
automatically	O
extract	O
subtitles	O
for	O
the	O
whole	O
video	O
source	O
file	O
during	O
its	O
playback	O
.	O
</s>
<s>
SubRip	B-Application
records	O
the	O
beginning	O
and	O
end	O
times	O
and	O
text	O
for	O
each	O
subtitle	O
in	O
the	O
output	O
text	O
.srt	B-Application
file	O
.	O
</s>
<s>
SubRip	B-Application
uses	O
AviSynth	B-Application
to	O
extract	O
video	O
frames	O
from	O
source	O
video	O
,	O
and	O
can	O
rip	O
subtitles	O
from	O
all	O
video	O
files	O
supported	O
by	O
that	O
program	O
.	O
</s>
<s>
The	O
SubRip	B-Application
file	O
format	O
is	O
described	O
on	O
the	O
Matroska	O
multimedia	O
container	O
format	O
website	O
as	O
"	O
perhaps	O
the	O
most	O
basic	O
of	O
all	O
subtitle	O
formats.	O
"	O
</s>
<s>
SubRip	B-Application
(	O
SubRip	B-Application
Text	O
)	O
files	O
are	O
named	O
with	O
the	O
extension	O
.srt	B-Application
,	O
and	O
contain	O
formatted	O
lines	O
of	O
plain	O
text	O
in	O
groups	O
separated	O
by	O
a	O
blank	O
line	O
.	O
</s>
<s>
Example	O
for	O
Star	B-Application
Wars	I-Application
:	I-Application
Episode	I-Application
II	I-Application
–	I-Application
Attack	I-Application
of	I-Application
the	I-Application
Clones	I-Application
:	O
</s>
<s>
Formatting	O
is	O
derived	O
from	O
HTML	B-Language
tags	O
for	O
bold	O
,	O
italic	O
,	O
underline	O
and	O
color	O
:	O
</s>
<s>
The	O
SubRip	B-Application
.srt	B-Application
file	O
format	O
is	O
supported	O
by	O
most	O
software	O
video	O
players	O
.	O
</s>
<s>
For	O
Windows	O
software	O
video	O
players	O
that	O
do	O
not	O
support	O
subtitle	O
playback	O
directly	O
,	O
the	O
VSFilter	O
DirectX	B-Application
filter	O
displays	O
SubRip	B-Application
and	O
other	O
subtitle	O
formats	O
.	O
</s>
<s>
The	O
SubRip	B-Application
format	O
is	O
supported	O
directly	O
by	O
many	O
subtitle	O
creation	O
and	O
editing	O
tools	O
,	O
</s>
<s>
In	O
August	O
2008	O
,	O
YouTube	B-General_Concept
added	O
subtitle	O
support	O
to	O
its	O
Flash	B-Operating_System
video	O
player	O
under	O
the	O
"	O
Closed	O
Captioning	O
"	O
option	O
–	O
content	O
producers	O
can	O
upload	O
subtitles	O
in	O
SubRip	B-Application
format	O
.	O
</s>
<s>
SubRip	B-Application
's	O
default	O
output	O
encoding	O
is	O
configured	O
as	O
Windows-1252	O
.	O
</s>
<s>
Therefore	O
,	O
there	O
is	O
no	O
de	O
facto	O
character	O
encoding	O
standard	O
for	O
.srt	B-Application
files	O
,	O
which	O
means	O
that	O
any	O
SubRip	B-Application
file	O
parser	O
must	O
attempt	O
to	O
use	O
Charset	O
detection	O
.	O
</s>
<s>
In	O
1999	O
,	O
Brain	O
created	O
SubRip	B-Application
,	O
and	O
a	O
friend	O
,	O
David	O
Dolinski	O
,	O
created	O
SubViewer	O
,	O
who	O
offered	O
it	O
for	O
download	O
on	O
his	O
personal	O
website	O
.	O
</s>
<s>
SubViewer	O
was	O
included	O
in	O
the	O
DivX	B-Application
media	O
player	O
.	O
</s>
<s>
On	O
August	O
28	O
,	O
2008	O
,	O
YouTube	B-General_Concept
included	O
support	O
for	O
SubViewer	O
and	O
SubRip	B-Application
,	O
allowing	O
existing	O
videos	O
to	O
be	O
retroactively	O
subtitled	O
.	O
</s>
<s>
A	O
format	O
originally	O
called	O
WebSRT	O
(	O
Web	O
Subtitle	O
Resource	O
Tracks	O
)	O
was	O
specified	O
in	O
2010	O
by	O
the	O
Web	B-Language
Hypertext	I-Language
Application	I-Language
Technology	I-Language
Working	I-Language
Group	I-Language
for	O
the	O
proposed	O
HTML5	B-Application
<track>	O
element	O
.	O
</s>
<s>
It	O
shared	O
the	O
.srt	B-Application
file	O
extension	O
and	O
was	O
based	O
on	O
parts	O
of	O
the	O
SubRip	B-Application
format	O
,	O
but	O
was	O
not	O
fully	O
compatible	O
with	O
it	O
.	O
</s>
<s>
Google	O
's	O
Chrome	O
and	O
Microsoft	O
's	O
Internet	O
Explorer	O
10	O
browsers	O
were	O
the	O
first	O
to	O
support	O
tags	O
with	O
WebVTT	O
files	O
for	O
HTML5	B-Application
videos	O
.	O
</s>
<s>
YouTube	B-General_Concept
began	O
supporting	O
WebVTT	O
in	O
April	O
,	O
2013	O
.	O
</s>
