<s>
The	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
is	O
a	O
high-quality	O
8-bit	O
4:2:0	O
video	O
codec	O
used	O
mainly	O
as	O
a	O
less	O
processor-intensive	O
way	O
of	O
working	O
with	O
long-GOP	O
MPEG-2	B-Algorithm
footage	O
such	O
as	O
HDV	O
.	O
</s>
<s>
It	O
is	O
recommended	O
for	O
use	O
with	O
all	O
HD	O
workflows	O
in	O
Final	B-Operating_System
Cut	I-Operating_System
Express	I-Operating_System
,	O
iMovie	B-Operating_System
,	O
and	O
until	O
Final	O
Cut	O
Pro	O
version	O
5	O
.	O
</s>
<s>
The	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
abbreviated	O
AIC	O
(	O
by	O
users	O
,	O
Apple	O
Engineers	O
do	O
n't	O
use	O
the	O
abbreviation	O
)	O
is	O
designed	O
by	O
Apple	O
Inc	O
.	O
to	O
be	O
an	O
intermediate	O
format	O
in	O
an	O
HDV	O
and	O
AVCHD	O
workflow	O
.	O
</s>
<s>
Unlike	O
native	O
MPEG-2	B-Algorithm
based	O
HDV	O
-	O
and	O
similar	O
to	O
the	O
standard-definition	O
DV	O
codec	O
-	O
the	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
does	O
not	O
use	O
temporal	O
compression	O
,	O
enabling	O
every	O
frame	O
to	O
be	O
decoded	O
immediately	O
without	O
decoding	O
other	O
frames	O
.	O
</s>
<s>
As	O
a	O
result	O
of	O
this	O
,	O
the	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
takes	O
three	O
to	O
four	O
times	O
more	O
space	O
than	O
HDV	O
.	O
</s>
<s>
The	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
is	O
officially	O
available	O
only	O
on	O
the	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
platform	O
but	O
can	O
be	O
read	O
on	O
other	O
platforms	O
such	O
as	O
Windows	B-Application
or	O
Linux	B-Application
,	O
using	O
FFmpeg	O
.	O
</s>
<s>
All	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
software	O
which	O
makes	O
use	O
of	O
the	O
QuickTime	B-Application
codec	O
libraries	O
-	O
such	O
as	O
Final	B-Operating_System
Cut	I-Operating_System
Studio	I-Operating_System
,	O
Final	B-Operating_System
Cut	I-Operating_System
Express	I-Operating_System
,	O
and	O
iMovie	B-Operating_System
-	O
can	O
use	O
the	O
Apple	B-Algorithm
Intermediate	I-Algorithm
codec	I-Algorithm
.	O
</s>
<s>
The	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
was	O
used	O
because	O
it	O
was	O
less	O
processor	O
intensive	O
;	O
as	O
the	O
compression	O
scheme	O
did	O
not	O
need	O
the	O
next	O
frame	O
to	O
be	O
displayed	O
.	O
</s>
<s>
It	O
's	O
still	O
used	O
in	O
the	O
iLife	O
package	O
,	O
specifically	O
iMovie	B-Operating_System
,	O
but	O
it	O
is	O
rarely	O
used	O
in	O
Final	O
Cut	O
Pro	O
as	O
of	O
Version	O
6	O
since	O
it	O
now	O
uses	O
the	O
ProRes	B-Algorithm
codecs	O
instead	O
of	O
the	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
,	O
though	O
some	O
versions	O
of	O
Final	O
Cut	O
Pro	O
(	O
HD	O
4.5	O
through	O
5	O
)	O
and	O
Final	B-Operating_System
Cut	I-Operating_System
Express	I-Operating_System
use	O
them	O
regularly	O
.	O
</s>
<s>
Its	O
compression	O
scheme	O
is	O
called	O
long-GOP	O
MPEG2	B-Algorithm
.	O
</s>
<s>
It	O
uses	O
Long-GOP	O
MPEG2	B-Algorithm
compression	O
to	O
achieve	O
a	O
maximum	O
data	O
rate	O
of	O
25mps	O
,	O
which	O
is	O
the	O
same	O
as	O
normal	O
DV	O
video	O
.	O
</s>
<s>
At	O
the	O
other	O
end	O
of	O
the	O
spectrum	O
,	O
the	O
opposite	O
of	O
long-GOP	O
MPEG	O
is	O
I-frame-only	O
MPEG	O
,	O
in	O
which	O
only	O
I-frames	O
are	O
used	O
.	O
</s>
<s>
1080-line	O
HDV	O
media	O
uses	O
an	O
open	O
GOP	B-General_Concept
structure	O
,	O
which	O
means	O
that	O
B-frames	O
in	O
the	O
MPEG	O
stream	O
can	O
be	O
reliant	O
on	O
frames	O
in	O
adjacent	O
GOPs	O
.	O
</s>
<s>
720-line	O
HDV	O
media	O
uses	O
a	O
closed	O
GOP	B-General_Concept
structure	O
,	O
which	O
means	O
that	O
each	O
GOP	B-General_Concept
is	O
self-contained	O
and	O
does	O
not	O
rely	O
on	O
frames	O
outside	O
the	O
GOP	B-General_Concept
.	O
</s>
<s>
To	O
record	O
such	O
large	O
images	O
with	O
such	O
a	O
low	O
data	O
rate	O
,	O
HDV	O
uses	O
long-GOP	O
MPEG	O
compression	O
.	O
</s>
<s>
Note	O
:	O
HDV	O
specifically	O
employs	O
MPEG-2	B-Algorithm
compression	O
,	O
but	O
the	O
concepts	O
of	O
long-GOP	O
and	O
I-frame-only	O
compression	O
discussed	O
below	O
apply	O
to	O
all	O
versions	O
of	O
the	O
MPEG	O
standard	O
:	O
MPEG-1	O
,	O
MPEG-2	B-Algorithm
,	O
and	O
MPEG-4	O
(	O
including	O
AVC/H.264	O
)	O
.	O
</s>
<s>
Both	O
MPEG-2	B-Algorithm
HDV	O
,	O
AVCHD	O
and	O
the	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
record	O
a	O
4:2:0	O
component	O
(	O
Y´CBCR	O
)	O
digital	O
video	O
signal	O
.	O
</s>
<s>
MPEG-2	B-Algorithm
HDV	O
and	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
feature	O
a	O
16:9	O
widescreen	O
aspect	O
ratio	O
for	O
all	O
resolutions	O
.	O
</s>
<s>
So	O
you	O
also	O
need	O
to	O
convert	O
to	O
the	O
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
if	O
you	O
plan	O
to	O
edit	O
in	O
Final	O
Cut	O
Pro	O
.	O
</s>
<s>
Codec	O
Bitrate	O
MPEG-2	B-Algorithm
HDV	O
720p30	O
2.5	O
MB/sec	O
.	O
</s>
<s>
MPEG-2	B-Algorithm
HDV	O
1080i60/50	O
3.3	O
MB/sec	O
.	O
</s>
<s>
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
HDV	O
720p30	O
approximately	O
7	O
MB/sec	O
.	O
</s>
<s>
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
HDV	O
1080i50	O
approximately	O
12	O
MB/sec	O
.	O
</s>
<s>
Apple	B-Algorithm
Intermediate	I-Algorithm
Codec	I-Algorithm
HDV	O
1080i60	O
approximately	O
14	O
MB/sec	O
.	O
</s>
