<s>
A	O
subtitle	B-Application
editor	I-Application
is	O
a	O
type	O
of	O
software	O
used	O
to	O
create	O
and	O
edit	O
subtitles	O
to	O
be	O
superimposed	O
over	O
,	O
and	O
synchronized	O
with	O
,	O
video	O
.	O
</s>
<s>
Subtitle	B-Application
editors	I-Application
are	O
available	O
as	O
standalone	O
applications	O
,	O
as	O
components	O
of	O
many	O
video	O
editing	O
software	O
suites	O
,	O
and	O
as	O
web	O
applications	O
.	O
</s>
<s>
A	O
capable	O
subtitle	B-Application
editor	I-Application
can	O
convert	O
one	O
time	O
measurement	O
system	O
into	O
another	O
without	O
error	O
.	O
</s>
<s>
Change	O
subtitle	O
format	O
(	O
MicroDVD	O
,	O
MPSub	O
,	O
SubRip	B-Application
,	O
...	O
)	O
</s>
<s>
Aegisub	B-Language
-	O
Free	O
.	O
</s>
<s>
Amara	B-General_Concept
-	O
Free	O
.	O
</s>
<s>
Gnome	B-Application
Subtitles	I-Application
-	O
Free	O
.	O
</s>
<s>
Subtitle	B-Language
Edit	I-Language
-	O
Free	O
and	O
Open	O
Source	O
under	O
GPL	O
License	O
.	O
</s>
<s>
Subtitle	B-Application
Composer	I-Application
-	O
Free	O
,	O
open	O
source	O
,	O
part	O
of	O
KDE	B-Application
.	O
</s>
<s>
SubRip	B-Application
-	O
Free	O
.	O
</s>
<s>
Not	O
an	O
editor	O
,	O
but	O
used	O
to	O
extract	O
subtitles	O
from	O
VOB	O
or	O
hard	O
subbed	O
video	O
files	O
by	O
optical	B-Application
character	I-Application
recognition	I-Application
to	O
a	O
subtitle	O
file	O
.	O
</s>
<s>
Avidemux	B-Language
-	O
Free	O
.	O
</s>
<s>
Avidemux	B-Language
is	O
video	O
editing	O
software	O
that	O
can	O
be	O
used	O
to	O
extract	O
subtitles	O
like	O
SubRip	B-Application
.	O
</s>
<s>
VobSub/VSFilter/DirectVobSub	O
-	O
not	O
an	O
editor	O
,	O
but	O
a	O
Windows	O
add-on	O
(	O
DirectX	B-Application
filter	O
)	O
which	O
displays	O
subtitles	O
during	O
video	O
playback	O
.	O
</s>
