<s>
Microsoft	B-Application
Expression	I-Application
Encoder	I-Application
(	O
formerly	O
Expression	B-Application
Media	I-Application
Encoder	I-Application
)	O
is	O
a	O
transcoding	B-Algorithm
and	O
non-linear	O
video	O
editing	O
software	O
application	O
for	O
Microsoft	O
Windows	O
.	O
</s>
<s>
It	O
can	O
create	O
video	O
streams	O
for	O
distribution	O
via	O
Microsoft	B-Application
Silverlight	I-Application
.	O
</s>
<s>
Expression	B-Application
Encoder	I-Application
is	O
a	O
transcoding	B-Algorithm
and	O
linear	O
video	O
editing	O
program	O
.	O
</s>
<s>
It	O
features	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
based	O
on	O
Windows	B-Device
Presentation	I-Device
Foundation	I-Device
(	O
WPF	O
)	O
as	O
well	O
as	O
a	O
command	B-Application
line	I-Application
interface	I-Application
.	O
</s>
<s>
It	O
can	O
export	O
videos	O
to	O
H.264	B-Application
or	O
VC-1	B-Operating_System
formats	O
or	O
prepare	O
video	O
streams	O
for	O
distribution	O
via	O
Microsoft	B-Application
Silverlight	I-Application
.	O
</s>
<s>
It	O
supports	O
Silverlight	B-Application
player	O
controls	O
and	O
Silverlight	B-Application
templates	O
.	O
</s>
<s>
Microsoft	B-Application
Expression	I-Application
Encoder	I-Application
is	O
available	O
in	O
different	O
editions	O
:	O
</s>
<s>
This	O
version	O
does	O
not	O
support	O
H.264	B-Application
or	O
Advanced	B-Application
Audio	I-Application
Coding	I-Application
(	O
AAC	B-Application
)	O
formats	O
in	O
its	O
output	O
,	O
nor	O
can	O
it	O
open	O
AVCHD	O
,	O
MPEG-2	B-Algorithm
and	O
Dolby	O
Digital	O
(	O
AC-3	O
)	O
formats	O
.	O
</s>
<s>
A	O
beta	O
of	O
version	O
2.0	O
was	O
released	O
in	O
March	O
2008	O
which	O
included	O
new	O
VC-1	B-Operating_System
codecs	O
(	O
Advanced	O
,	O
Main	O
,	O
and	O
Simple	O
profiles	O
)	O
and	O
better	O
Silverlight	B-Application
support	O
.	O
</s>
<s>
Expression	O
The	O
first	O
service	O
pack	O
added	O
H.264	B-Application
+AAC	O
encoding	O
support	O
for	O
devices	O
.	O
</s>
<s>
According	O
to	O
Microsoft	O
,	O
Expression	B-Application
Encoder	I-Application
2	O
was	O
not	O
a	O
replacement	O
for	O
Windows	B-Protocol
Media	I-Protocol
Encoder	I-Protocol
,	O
despite	O
having	O
many	O
similarities	O
.	O
</s>
<s>
Expression	B-Application
Encoder	I-Application
3	O
added	O
multi-channel	O
audio	O
output	O
,	O
more	O
built	O
in	O
device	O
profiles	O
,	O
like	O
support	O
for	O
Zune	O
HD	O
,	O
Xbox	B-Operating_System
360	I-Operating_System
and	O
iPod	B-Device
Touch	I-Device
,	O
as	O
well	O
as	O
profiles	O
for	O
online	O
services	O
such	O
as	O
Facebook	O
and	O
YouTube	O
.	O
</s>
<s>
It	O
also	O
added	O
Expression	B-Application
Encoder	I-Application
3	O
Screen	O
Capture	O
,	O
which	O
allows	O
users	O
to	O
create	O
video	O
screen	O
captures	O
.	O
</s>
<s>
Version	O
4	O
added	O
IIS	O
live	O
smooth	O
streaming	O
,	O
screen	O
capture	O
improvements	O
and	O
an	O
H.264	B-Application
encoder	O
based	O
on	O
the	O
MainConcept	B-Algorithm
SDK	O
.	O
</s>
<s>
Expression	B-Application
Encoder	I-Application
4.0	O
SP1	O
was	O
released	O
in	O
January	O
2011	O
and	O
added	O
CUDA-enabled	O
GPU-assisted	O
encoding	O
,	O
HE-AAC	O
,	O
screen	O
captures	O
as	O
a	O
live	O
source	O
,	O
live	O
broadcasting	O
templates	O
,	O
Selective	O
Blend	O
de-interlacing	O
and	O
other	O
features	O
.	O
</s>
<s>
Some	O
of	O
Microsoft	B-Application
Expression	I-Application
Encoder	I-Application
features	O
include	O
:	O
</s>
<s>
Integrated	O
WebDAV	B-Protocol
publishing	O
.	O
</s>
<s>
Microsoft	B-Application
Expression	I-Application
Encoder	I-Application
cannot	O
encode	O
video	O
streams	O
in	O
Windows	O
Media	O
Video	O
formats	O
older	O
than	O
version	O
9	O
.	O
</s>
<s>
Expression	B-Application
Encoder	I-Application
requires	O
QuickTime	B-Application
to	O
decode	O
MP4	O
container	O
format	O
,	O
although	O
Media	B-Device
Foundation	I-Device
,	O
a	O
component	O
of	O
Windows	B-Device
7	I-Device
,	O
can	O
natively	O
decode	O
this	O
format	O
.	O
</s>
