<s>
RTVideo	B-Device
is	O
Microsoft	O
's	O
default	O
video	O
codec	O
for	O
Office	B-Protocol
Communications	I-Protocol
Server	I-Protocol
2007	O
and	O
the	O
Microsoft	B-Protocol
Office	I-Protocol
Communicator	I-Protocol
2007	I-Protocol
client	O
.	O
</s>
<s>
It	O
is	O
a	O
Microsoft	O
proprietary	O
implementation	O
of	O
the	O
VC-1	B-Operating_System
codec	O
for	O
real-time	O
transmission	O
purposes	O
.	O
</s>
<s>
Microsoft	O
extensions	O
to	O
VC-1	B-Operating_System
are	O
based	O
on	O
cached	O
frame	O
and	O
SP-frame	O
.	O
</s>
<s>
Also	O
it	O
includes	O
system-level	O
enhancements	O
for	O
recovery	O
of	O
packet	B-Protocol
loss	I-Protocol
on	O
IP	O
networks	O
-	O
forward	B-Error_Name
error	I-Error_Name
correction	I-Error_Name
and	O
error	O
concealment	O
.	O
</s>
<s>
RTVideo	B-Device
is	O
a	O
proprietary	O
codec	O
.	O
</s>
<s>
Like	O
RTAudio	B-Algorithm
this	O
protocol	O
can	O
also	O
be	O
licensed	O
from	O
Microsoft	O
.	O
</s>
