<s>
Avidemux	B-Language
is	O
a	O
free	B-License
and	I-License
open-source	I-License
software	I-License
application	O
for	O
non-linear	O
video	O
editing	O
and	O
transcoding	B-Algorithm
multimedia	O
files	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
C++	B-Language
and	O
uses	O
Qt	B-Language
for	O
its	O
graphical	B-Application
user	I-Application
interface	I-Application
,	O
and	O
FFmpeg	B-Library
for	O
its	O
multimedia	O
functions	O
.	O
</s>
<s>
Starting	O
with	O
version	O
2.4	O
,	O
Avidemux	B-Language
also	O
offers	O
a	O
command-line	B-Application
interface	I-Application
,	O
and	O
since	O
version	O
2.6	O
,	O
the	O
original	O
GTK	B-Application
port	O
has	O
not	O
been	O
maintained	O
and	O
is	O
now	O
discontinued	O
.	O
</s>
<s>
Avidemux	B-Language
is	O
developed	O
for	O
Linux	B-Application
,	O
macOS	B-Application
,	O
and	O
Windows	O
.	O
</s>
<s>
Unofficial	O
builds	O
are	O
also	O
available	O
for	O
FreeBSD	B-Operating_System
,	O
NetBSD	B-Device
,	O
and	O
OpenBSD	B-Operating_System
.	O
</s>
<s>
Avidemux	B-Language
is	O
capable	O
of	O
non-linear	O
video	O
editing	O
,	O
applying	O
visual	O
effects	O
(	O
called	O
"	O
Filters	O
"	O
by	O
Avidemux	B-Language
)	O
to	O
video	O
,	O
and	O
transcoding	B-Algorithm
video	O
into	O
various	O
formats	O
.	O
</s>
<s>
Some	O
of	O
the	O
filters	O
were	O
ported	O
from	O
MPlayer	B-Application
and	O
Avisynth	B-Application
.	O
</s>
<s>
Avidemux	B-Language
can	O
also	O
insert	O
audio	O
streams	O
into	O
a	O
video	O
file	O
(	O
an	O
action	O
known	O
as	O
multiplexing	B-Architecture
or	O
"	O
muxing	B-Architecture
"	O
)	O
or	O
extract	O
audio	O
streams	O
from	O
video	O
files	O
(	O
an	O
action	O
known	O
as	O
"	O
demuxing	B-Architecture
"	O
)	O
.	O
</s>
<s>
An	O
integral	O
and	O
important	O
part	O
of	O
the	O
design	O
of	O
the	O
program	O
is	O
its	O
project	O
system	O
,	O
which	O
uses	O
the	O
SpiderMonkey	B-Language
JavaScript	I-Language
engine	I-Language
.	O
</s>
<s>
Like	O
VirtualDub	B-Application
's	O
VCF	O
scripting	O
capabilities	O
,	O
Avidemux	B-Language
has	O
advanced	O
scripting	O
available	O
for	O
it	O
both	O
in	O
its	O
GUI	B-Application
and	O
command	B-Application
line	I-Application
modes	O
.	O
</s>
<s>
It	O
also	O
supports	O
a	O
non-project	O
system	O
just	O
like	O
VirtualDub	B-Application
,	O
where	O
users	O
can	O
simply	O
create	O
all	O
of	O
their	O
configurations	O
and	O
save	O
the	O
video	O
directly	O
without	O
making	O
a	O
project	O
file	O
.	O
</s>
<s>
Avidemux	B-Language
has	O
built-in	O
subtitle	O
processing	O
,	O
both	O
for	O
optical	B-Application
character	I-Application
recognition	I-Application
of	O
DVD	O
subtitles	O
and	O
for	O
rendering	O
hard	O
subtitles	O
.	O
</s>
<s>
Avidemux	B-Language
supports	O
various	O
subtitle	O
formats	O
,	O
including	O
MicroDVD	O
(	O
.SUB	O
)	O
,	O
SubStation	O
Alpha	O
(	O
.SSA	O
)	O
,	O
Advanced	O
SubStation	O
Alpha	O
(	O
.ASS	O
)	O
and	O
SubRip	B-Application
(	O
.SRT	B-Application
)	O
.	O
</s>
<s>
Avidemux	B-Language
was	O
written	O
from	O
scratch	O
,	O
but	O
additional	O
code	O
from	O
FFmpeg	B-Library
,	O
MPlayer	B-Application
,	O
Transcode	B-Algorithm
and	O
Avisynth	B-Application
has	O
been	O
used	O
on	O
occasion	O
as	O
well	O
.	O
</s>
<s>
The	O
built-in	O
libavcodec	B-Language
library	O
from	O
the	O
FFmpeg	B-Library
project	O
is	O
used	O
for	O
decoding	O
and	O
encoding	O
of	O
various	O
audio	O
and	O
video	O
formats	O
such	O
as	O
MPEG-4	B-Application
ASP	I-Application
.	O
</s>
<s>
The	O
primary	O
(	O
though	O
not	O
the	O
only	O
)	O
Avidemux	B-Language
programmer	O
uses	O
the	O
nickname	O
'	O
Mean	O
 '	O
on	O
the	O
Avidemux	B-Language
forum	O
.	O
</s>
<s>
Multithreading	O
has	O
been	O
implemented	O
in	O
the	O
following	O
areas	O
of	O
Avidemux	B-Language
(	O
some	O
partially	O
through	O
libavcodec	B-Language
)	O
:	O
</s>
<s>
Earlier	O
versions	O
of	O
Xvid	B-Algorithm
are	O
not	O
compatible	O
with	O
this	O
feature	O
.	O
</s>
<s>
Avidemux	B-Language
supports	O
following	O
file	O
formats	O
:	O
</s>
