<s>
Video	B-General_Concept
capture	I-General_Concept
is	O
the	O
process	O
of	O
converting	O
an	O
analog	O
video	O
signal	O
—	O
such	O
as	O
that	O
produced	O
by	O
a	O
video	O
camera	O
,	O
DVD	O
player	O
,	O
or	O
television	O
tuner	O
—	O
to	O
digital	O
video	O
and	O
sending	O
it	O
to	O
local	O
storage	O
or	O
to	O
external	O
circuitry	O
.	O
</s>
<s>
Depending	O
on	O
the	O
application	O
,	O
a	O
video	O
stream	O
may	O
be	O
recorded	O
as	O
computer	B-Operating_System
files	I-Operating_System
,	O
or	O
sent	O
to	O
a	O
video	O
display	O
,	O
or	O
both	O
.	O
</s>
<s>
Special	O
electronic	O
circuitry	O
is	O
required	O
to	O
capture	B-General_Concept
video	I-General_Concept
from	O
analog	O
video	O
sources	O
.	O
</s>
<s>
At	O
the	O
system	O
level	O
this	O
function	O
is	O
typically	O
performed	O
by	O
a	O
dedicated	O
video	B-General_Concept
capture	I-General_Concept
device	O
.	O
</s>
<s>
Such	O
devices	O
typically	O
employ	O
integrated	O
circuit	O
video	O
decoders	O
to	O
convert	O
incoming	O
video	O
signals	O
to	O
a	O
standard	O
digital	O
video	O
format	O
,	O
and	O
additional	O
circuitry	O
to	O
convey	O
the	O
resulting	O
digital	O
video	O
to	O
local	O
storage	O
or	O
to	O
circuitry	O
outside	O
the	O
video	B-General_Concept
capture	I-General_Concept
device	O
,	O
or	O
both	O
.	O
</s>
<s>
Depending	O
on	O
the	O
device	O
,	O
the	O
resulting	O
video	O
stream	O
may	O
be	O
conveyed	O
to	O
external	O
circuitry	O
via	O
a	O
computer	O
bus	O
(	O
e.g.	O
,	O
PCI/104	B-Device
or	O
PCIe	O
)	O
or	O
a	O
communication	O
interface	O
such	O
as	O
USB	B-Protocol
,	O
Ethernet	O
or	O
WiFi	O
,	O
or	O
stored	O
in	O
mass-storage	O
memory	O
in	O
the	O
device	O
itself	O
(	O
e.g.	O
,	O
digital	B-Application
video	I-Application
recorder	I-Application
)	O
.	O
</s>
