<s>
VirtualDub	B-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
video	B-General_Concept
capture	I-General_Concept
and	O
video	O
processing	O
utility	O
for	O
Microsoft	B-Application
Windows	I-Application
written	O
by	O
Avery	O
Lee	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
VirtualDub	B-Application
,	O
written	O
for	O
Windows	B-Application
95	I-Application
,	O
to	O
be	O
released	O
on	O
SourceForge	B-Application
was	O
uploaded	O
on	O
August	O
20	O
,	O
2000	O
.	O
</s>
<s>
In	O
2009	O
,	O
the	O
third-party	O
software	O
print	O
guide	O
Learning	O
VirtualDub	B-Application
referred	O
to	O
VirtualDub	B-Application
as	O
"	O
the	O
leading	O
free	O
Open	O
Source	O
video	B-General_Concept
capture	I-General_Concept
and	O
processing	O
tool	O
"	O
.	O
</s>
<s>
Due	O
to	O
its	O
"	O
powerful	O
"	O
versatility	O
and	O
usefulness	O
especially	O
in	O
the	O
field	O
of	O
video	O
processing	O
(	O
see	O
below	O
)	O
,	O
PC	O
World	O
has	O
referred	O
to	O
VirtualDub	B-Application
as	O
"	O
something	O
of	O
a	O
'	O
Photoshop	B-Operating_System
 '	O
for	O
video	O
files	O
"	O
,	O
PC	O
Perspective	O
recommends	O
it	O
for	O
its	O
low	O
overhead	O
,	O
and	O
nextmedia	O
's	O
PC	O
&	O
Tech	O
Authority	O
particularly	O
praises	O
it	O
for	O
its	O
Direct	O
stream	O
copy	O
feature	O
to	O
avoid	O
generational	O
degradation	O
of	O
video	O
quality	O
when	O
performing	O
simple	O
editing	O
and	O
trimming	O
tasks	O
and	O
the	O
fact	O
that	O
VirtualDub	B-Application
"	O
offers	O
several	O
valuable	O
features	O
that	O
other	O
packages	O
lack	O
,	O
and	O
helps	O
you	O
get	O
quick	O
results	O
without	O
any	O
fuss	O
or	O
patronising	O
wizards	O
"	O
.	O
</s>
<s>
VirtualDub	B-Application
is	O
recommended	O
for	O
use	O
by	O
professional	O
computer	O
and	O
tech	O
magazines	O
,	O
guides	O
,	O
and	O
reviewers	O
such	O
as	O
PC	O
World	O
,	O
PC	O
&	O
Tech	O
Authority	O
,	O
PC	O
Perspective	O
,	O
technologies	O
guide	O
website	O
MakeTechEasier	O
,	O
freeware	O
and	O
open	O
source	O
software	O
review	O
site	O
Ghacks	O
,	O
Speed	O
Demos	O
Archive	O
,	O
as	O
well	O
as	O
third-party	O
professional	O
video	O
production	O
companies	O
,	O
and	O
the	O
creators	O
of	O
Wine	B-Application
(	O
software	O
)	O
.	O
</s>
<s>
Several	O
hundred	O
third-party	O
plug-ins	O
for	O
VirtualDub	B-Application
exist	O
,	O
including	O
by	O
professional	O
software	O
companies	O
.	O
</s>
<s>
Furthermore	O
,	O
Debugmode	O
Wax	O
allows	O
use	O
of	O
VirtualDub	B-Application
plug-ins	O
in	O
professional	O
video	O
editing	O
software	O
such	O
as	O
Adobe	B-Operating_System
Premiere	I-Operating_System
Pro	I-Operating_System
and	O
Vegas	B-Application
Pro	I-Application
.	O
</s>
<s>
VirtualDub	B-Application
is	O
designed	O
for	O
Microsoft	B-Application
Windows	I-Application
but	O
may	O
run	O
on	O
Linux	B-Application
and	O
Mac	B-Application
OS	I-Application
X	I-Application
using	O
Wine	B-Application
(	O
for	O
example	O
,	O
to	O
use	O
it	O
with	O
the	O
popular	O
Deshaker	O
plugin	O
)	O
.	O
</s>
<s>
VirtualDub	B-Application
was	O
made	O
to	O
operate	O
exclusively	O
on	O
AVI	O
files	O
;	O
however	O
,	O
a	O
plugin	O
API	O
was	O
added	O
from	O
version	O
1.7.2	O
which	O
allows	O
the	O
import	O
of	O
other	O
formats	O
.	O
</s>
<s>
Appropriate	O
video	O
and	O
audio	O
codecs	B-General_Concept
need	O
to	O
be	O
installed	O
.	O
</s>
<s>
VirtualDub	B-Application
supports	O
both	O
DirectShow	B-Library
and	O
Video	B-Device
for	I-Device
Windows	I-Device
for	O
video	B-General_Concept
capture	I-General_Concept
.	O
</s>
<s>
Capture	O
features	O
include	O
capture	O
to	O
any	O
AVI	O
variant	O
,	O
audio	O
VU	O
meters	O
,	O
overlay	O
and	O
preview	O
modes	O
,	O
histogram	B-Algorithm
,	O
selectable	O
crop	O
area	O
,	O
video	O
noise	O
reduction	O
,	O
auto	O
stop	O
settings	O
(	O
based	O
on	O
capture	O
time	O
,	O
file	O
size	O
,	O
free	O
space	O
,	O
and/or	O
dropped	O
frames	O
)	O
,	O
and	O
designate	O
alternate	O
drive(s )	O
for	O
capture	O
overflow	O
.	O
</s>
<s>
VirtualDub	B-Application
can	O
help	O
overcome	O
problems	O
with	O
digital	B-Device
cameras	I-Device
that	O
also	O
record	O
video	O
.	O
</s>
<s>
Many	O
models	O
,	O
especially	O
Canon	O
,	O
record	O
in	O
an	O
M-JPEG	B-Application
format	O
incompatible	O
with	O
Sony	B-Application
Vegas	I-Application
6.0	O
and	O
7.0	O
.	O
</s>
<s>
VirtualDub	B-Application
supports	O
DV	O
capture	O
from	O
Type	O
2	O
(	O
VfW	O
)	O
FireWire	B-Protocol
controllers	O
only	O
(	O
It	O
cannot	O
work	O
with	O
Type	O
1	O
)	O
.	O
</s>
<s>
VirtualDub	B-Application
can	O
create	O
a	O
video	O
file	O
from	O
a	O
series	O
of	O
image	O
files	O
in	O
Truevision	O
TGA	O
or	O
Windows	B-Device
Bitmap	I-Device
file	O
formats	O
.	O
</s>
<s>
001.bmp	O
,	O
002.bmp	O
,	O
bmp	B-Device
..	O
)	O
.	O
</s>
<s>
VirtualDub	B-Application
can	O
also	O
disassemble	O
a	O
video	O
by	O
extracting	O
its	O
soundtracks	O
saving	O
its	O
frames	O
into	O
Truevision	O
TGA	O
or	O
Windows	B-Device
Bitmap	I-Device
files	O
.	O
</s>
<s>
VirtualDub	B-Application
can	O
delete	O
segments	O
of	O
a	O
video	O
file	O
,	O
append	O
new	O
segments	O
,	O
or	O
reorder	O
existing	O
segments	O
.	O
</s>
<s>
Appended	O
segments	O
must	O
have	O
similar	O
audio	O
and	O
video	B-Application
formats	I-Application
,	O
dimensions	O
,	O
number	O
of	O
audio	O
channels	O
,	O
frame	O
rates	O
and	O
sampling	O
rates	O
.	O
</s>
<s>
Otherwise	O
,	O
VirtualDub	B-Application
is	O
incapable	O
of	O
mixing	O
dissimilar	O
video	O
files	O
or	O
adding	O
transition	O
effects	O
between	O
segments	O
.	O
</s>
<s>
VirtualDub	B-Application
comes	O
with	O
a	O
number	O
of	O
video	O
editing	O
components	O
known	O
as	O
"	O
filters	O
"	O
.	O
</s>
<s>
Filter	O
plug-ins	O
further	O
extend	O
VirtualDub	B-Application
's	O
capabilities	O
.	O
</s>
<s>
A	O
plug-in	O
SDK	B-Application
is	O
available	O
for	O
developers	O
to	O
create	O
their	O
own	O
video	O
and	O
audio	O
filters	O
.	O
</s>
<s>
Besides	O
those	O
basic	O
features	O
,	O
its	O
many	O
third-party	O
plug-ins	O
make	O
VirtualDub	B-Application
a	O
"	O
powerful	O
"	O
open-source	O
tool	O
when	O
it	O
comes	O
to	O
linear	O
video	O
processing	O
,	O
and	O
in	O
fact	O
most	O
of	O
the	O
hundreds	O
of	O
third-party	O
plug-ins	O
available	O
for	O
VirtualDub	B-Application
are	O
filters	O
related	O
to	O
either	O
aesthetic	O
effects	O
or	O
cleaning	O
,	O
fixing	O
,	O
and	O
restoring	O
image	O
quality	O
,	O
such	O
as	O
various	O
denoising	O
and	O
sharpening	O
methods	O
targeted	O
especially	O
at	O
analogue	O
and	O
digital	O
video	B-Application
signal	I-Application
and	O
film	O
defects	O
(	O
be	O
they	O
related	O
to	O
VHS	O
,	O
faulty	O
cables	O
,	O
a	O
distorted	O
analogue	O
terrestrial	O
or	O
satellite	O
TV	O
reception	O
,	O
or	O
digital	B-Algorithm
compression	I-Algorithm
)	O
,	O
deinterlacing	O
and	O
fields	O
manipulation	O
,	O
colorspace	B-Algorithm
conversion	O
and	O
manipulation	O
,	O
reverse	O
telecine	O
aka	O
IVTC	O
,	O
deflickering	O
,	O
deshaking	O
,	O
adding	O
and	O
removing	O
logos	O
and	O
subtitles	O
,	O
analysis	O
of	O
video	O
content	O
,	O
etc	O
.	O
</s>
<s>
All	O
of	O
these	O
processing	O
features	O
are	O
fully	O
batchable	B-General_Concept
to	O
apply	O
the	O
same	O
effects	O
on	O
a	O
large	O
number	O
of	O
files	O
.	O
</s>
<s>
VirtualDub	B-Application
is	O
free	B-Application
software	I-Application
,	O
released	O
under	O
the	O
GNU	B-License
GPL-2.0-or-later	I-License
and	O
hosted	O
on	O
SourceForge.net	B-Application
.	O
</s>
<s>
VirtualDub	B-Application
was	O
originally	O
created	O
by	O
the	O
author	O
,	O
when	O
a	O
college	O
student	O
,	O
for	O
the	O
purpose	O
of	O
compressing	O
anime	O
videos	B-Application
of	O
Sailor	B-Application
Moon	I-Application
.	O
</s>
<s>
It	O
was	O
written	O
to	O
read	O
and	O
write	O
AVI	O
videos	B-Application
,	O
but	O
support	O
for	O
input	O
plug-ins	O
was	O
added	O
,	O
enabling	O
it	O
to	O
read	O
additional	O
formats	O
including	O
MPEG-2	B-Algorithm
,	O
Matroska	O
,	O
Flash	B-Operating_System
Video	I-Operating_System
,	O
Windows	B-Device
Media	I-Device
,	O
QuickTime	B-Application
,	O
MP4	O
and	O
others	O
.	O
</s>
<s>
VirtualDub	B-Application
has	O
spawned	O
several	O
forks	B-Application
,	O
including	O
VirtualDubMod	B-Language
and	O
Nandub	B-Application
.	O
</s>
<s>
The	O
latest	O
fork	B-Application
is	O
called	O
VirtualDub2	O
(	O
formerly	O
VirtualDub	B-Application
FilterMod	O
)	O
.	O
</s>
<s>
It	O
has	O
all	O
the	O
features	O
of	O
the	O
original	O
VirtualDub	B-Application
,	O
plus	O
support	O
for	O
high	O
bit-depth	O
(	O
i.e.	O
,	O
deep	O
color	O
)	O
.	O
</s>
<s>
It	O
is	O
no	O
longer	O
limited	O
to	O
Video	B-Device
for	I-Device
Windows	I-Device
(	O
Video	B-Device
Compression	I-Device
Manager	I-Device
)	O
codecs	B-General_Concept
,	O
and	O
AVI	O
format	O
limitations	O
(	O
such	O
as	O
limited	O
VBR	O
support	O
,	O
H.264/HEVC	O
minor	O
incompatibilities	O
etc	O
.	O
</s>
<s>
The	O
VirtualDub2	O
fork	B-Application
has	O
built-in	O
encode/decode	O
of	O
any	O
container	O
and	O
video	O
and	O
audio	O
compression	O
formats	O
supported	O
by	O
FFmpeg	B-Library
(	O
H.264	B-Application
,	O
HEVC	O
,	O
VP9	O
,	O
AAC	O
,	O
Opus	O
and	O
other	O
formats	O
)	O
and	O
can	O
open	O
and	O
save	O
QuickTime	B-Application
File	I-Application
Format	I-Application
(	O
MOV	O
)	O
,	O
MP4	O
,	O
Matroska	O
,	O
WebM	B-Application
,	O
AVI	O
based	O
on	O
FFmpeg	B-Library
or	O
only	O
the	O
audio	O
from	O
a	O
video	O
in	O
M4A	O
,	O
Opus	O
in	O
Matroska	O
,	O
Ogg	O
Opus	O
,	O
Vorbis	O
,	O
AAC	O
or	O
MP3	O
formats	O
.	O
</s>
<s>
Early	O
versions	O
of	O
VirtualDub	B-Application
supported	O
importing	O
of	O
Microsoft	O
's	O
Advanced	B-Application
Systems	I-Application
Format	I-Application
,	O
but	O
this	O
was	O
removed	O
in	O
version	O
1.3d	O
following	O
an	O
informal	O
phone	O
call	O
from	O
a	O
Microsoft	O
employee	O
in	O
2000	O
claiming	O
that	O
it	O
infringed	O
one	O
of	O
Microsoft	O
's	O
patents	O
.	O
</s>
<s>
In	O
August	O
2006	O
,	O
VirtualDub	B-Application
's	O
German	O
users	O
who	O
hosted	O
copies	O
of	O
VirtualDub	B-Application
,	O
or	O
even	O
linked	O
to	O
them	O
on	O
their	O
web	O
pages	O
,	O
began	O
receiving	O
cease	O
and	O
desist	O
letters	O
from	O
a	O
private	O
individual	O
that	O
claimed	O
to	O
have	O
German	O
word	O
mark	O
on	O
"	O
VirtualDub	B-Application
"	O
.	O
</s>
