<s>
iFrame	B-Algorithm
is	O
a	O
digital	O
video	O
format	O
developed	O
by	O
Apple	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
existing	O
industry	O
standards	O
,	O
such	O
as	O
AVC/H.264	B-Application
,	O
AAC	B-Application
and	O
QuickTime	B-Application
,	O
and	O
can	O
be	O
used	O
with	O
compatible	O
Mac	O
and	O
PC	O
applications	O
.	O
</s>
<s>
Traditionally	O
,	O
Apple	O
video	O
editing	O
tools	O
like	O
Final	B-Application
Cut	I-Application
Pro	I-Application
and	O
iMovie	B-Operating_System
have	O
required	O
conversion	O
of	O
video	O
from	O
its	O
original	O
format	O
into	O
intermediate	O
format	O
such	O
as	O
ProRes	O
422	O
or	O
AIC	B-Algorithm
for	O
editing	O
.	O
</s>
<s>
With	O
iFrame	B-Algorithm
such	O
conversion	O
is	O
no	O
longer	O
needed	O
starting	O
from	O
iMovie	B-Operating_System
'	O
09	O
.	O
</s>
<s>
iFrame	B-Algorithm
video	O
and	O
audio	O
is	O
encoded	O
using	O
lossy	B-Algorithm
compression	I-Algorithm
.	O
</s>
<s>
Only	O
intraframe	O
compression	O
is	O
enabled	O
;	O
every	O
frame	O
is	O
a	O
stand-alone	O
i-frame	B-General_Concept
.	O
</s>
<s>
Video	O
is	O
encoded	O
with	O
the	O
AVC/H.264	B-Application
compression	O
scheme	O
.	O
</s>
<s>
Audio	O
is	O
encoded	O
with	O
the	O
AAC	B-Application
codec	O
.	O
</s>
<s>
The	O
compressed	O
audio	O
and	O
video	O
are	O
multiplexed	B-Architecture
into	O
a	O
QuickTime	B-Application
file	O
.	O
</s>
<s>
To	O
reduce	O
data	O
rate	O
and	O
hardware	O
requirements	O
,	O
video	O
frame	O
has	O
size	O
of	O
960	O
horizontal	O
by	O
540	O
vertical	O
pixels	O
with	O
pixel	B-Device
aspect	I-Device
ratio	I-Device
of	O
1:1	O
,	O
which	O
results	O
in	O
16:9	O
display	O
aspect	B-Device
ratio	I-Device
.	O
</s>
<s>
Progressive	B-Device
scanning	I-Device
at	O
30	O
or	O
25	O
frames	O
per	O
second	O
reduces	O
data	O
rate	O
even	O
further	O
,	O
but	O
may	O
result	O
in	O
increased	O
“	O
judder	O
”	O
when	O
compared	O
to	O
the	O
traditional	O
rate	O
of	O
60	O
or	O
50	O
images	O
per	O
second	O
(	O
fields	O
or	O
complete	O
frames	O
depending	O
on	O
scanning	O
type	O
)	O
used	O
for	O
television	O
broadcast	O
.	O
</s>
<s>
Frame	O
size	O
of	O
960	O
by	O
540	O
pixels	O
nicknamed	O
qHD	O
became	O
popular	O
among	O
manufacturers	O
of	O
smartphones	B-Application
,	O
including	O
Apple	O
's	O
own	O
iPhone	B-Device
.	O
</s>
