<s>
QuickTime	O
is	O
a	O
discontinued	O
extensible	O
multimedia	B-Library
framework	I-Library
created	O
by	O
Apple	O
,	O
which	O
supports	O
playing	O
,	O
streaming	O
,	O
encoding	B-General_Concept
,	O
and	O
transcoding	B-Algorithm
a	O
variety	O
of	O
digital	O
media	O
formats	O
.	O
</s>
<s>
The	O
term	O
QuickTime	O
also	O
refers	O
to	O
the	O
QuickTime	O
Player	O
front-end	B-Architecture
media	O
player	O
application	O
,	O
which	O
is	O
built-into	O
macOS	B-Application
,	O
and	O
was	O
available	O
for	O
download	O
on	O
Windows	B-Application
until	O
2016	O
.	O
</s>
<s>
QuickTime	O
could	O
embed	O
a	O
number	O
of	O
advanced	O
media	O
types	O
,	O
including	O
panoramic	O
images	O
(	O
called	O
QuickTime	B-Application
VR	I-Application
)	O
and	O
Adobe	B-Operating_System
Flash	I-Operating_System
.	O
</s>
<s>
The	O
QuickTime	B-Application
File	I-Application
Format	I-Application
became	O
the	O
basis	O
for	O
the	O
MPEG-4	B-Algorithm
standard	O
.	O
</s>
<s>
During	O
its	O
heyday	O
,	O
QuickTime	O
was	O
notably	O
used	O
to	O
create	O
the	O
innovative	O
Myst	B-Application
and	O
Xplora1	O
video	O
games	O
,	O
and	O
to	O
exclusively	O
distribute	O
movie	O
trailers	O
for	O
several	O
Star	B-Application
Wars	I-Application
movies	O
.	O
</s>
<s>
QuickTime	O
could	O
support	O
additional	O
codecs	B-General_Concept
through	O
plug-ins	O
,	O
for	O
example	O
with	O
Perian	B-Operating_System
.	O
</s>
<s>
As	O
operating	O
systems	O
and	O
browsers	O
gained	O
support	O
for	O
MPEG-4	B-Algorithm
and	O
subsequent	O
standards	O
like	O
H.264	B-Application
,	O
the	O
need	O
for	O
a	O
cross-platform	O
version	O
of	O
QuickTime	O
diminished	O
,	O
and	O
Apple	O
discontinued	O
the	O
Windows	B-Application
version	O
of	O
QuickTime	O
in	O
2016	O
.	O
</s>
<s>
In	O
Mac	B-Device
OS	I-Device
X	I-Device
Snow	I-Device
Leopard	I-Device
,	O
QuickTime	O
7	O
was	O
discontinued	O
in	O
favor	O
of	O
QuickTime	O
Player	O
X	O
,	O
which	O
abandoned	O
the	O
aging	O
QuickTime	O
framework	O
in	O
favor	O
of	O
the	O
AVFoundation	B-Operating_System
framework	O
.	O
</s>
<s>
QuickTime	O
Player	O
X	O
does	O
not	O
support	O
video	O
editing	O
(	O
beyond	O
trimming	O
clips	O
)	O
or	O
plug-ins	O
for	O
additional	O
codec	B-General_Concept
support	O
.	O
</s>
<s>
macOS	B-Device
Catalina	I-Device
dropped	O
support	O
for	O
all	O
32-bit	O
applications	O
,	O
including	O
the	O
QTKit	B-Operating_System
framework	O
and	O
the	O
old	O
QuickTime	O
7	O
.	O
</s>
<s>
QuickTime	O
is	O
bundled	O
with	O
macOS	B-Application
.	O
</s>
<s>
QuickTime	O
for	O
Microsoft	B-Application
Windows	I-Application
is	O
downloadable	O
as	O
a	O
standalone	O
installation	O
,	O
and	O
was	O
bundled	O
with	O
Apple	B-Operating_System
's	I-Operating_System
iTunes	I-Operating_System
prior	O
to	O
iTunes	O
10.5	O
,	O
but	O
is	O
no	O
longer	O
supported	O
and	O
therefore	O
security	O
vulnerabilities	O
will	O
no	O
longer	O
be	O
patched	O
.	O
</s>
<s>
Already	O
,	O
at	O
the	O
time	O
of	O
the	O
Windows	B-Application
version	O
's	O
discontinuation	O
,	O
two	O
such	O
zero-day	O
vulnerabilities	O
(	O
both	O
of	O
which	O
permitted	O
arbitrary	O
code	O
execution	O
)	O
were	O
identified	O
and	O
publicly	O
disclosed	O
by	O
Trend	O
Micro	O
;	O
consequently	O
,	O
Trend	O
Micro	O
strongly	O
advised	O
users	O
to	O
uninstall	O
the	O
product	O
from	O
Windows	B-Application
systems	O
.	O
</s>
<s>
Software	B-Application
development	I-Application
kits	I-Application
(	O
SDK	B-Application
)	O
for	O
QuickTime	O
are	O
available	O
to	O
the	O
public	O
with	O
an	O
Apple	B-Operating_System
Developer	I-Operating_System
Connection	I-Operating_System
(	O
ADC	O
)	O
subscription	O
.	O
</s>
<s>
It	O
is	O
available	O
free	O
of	O
charge	O
for	O
both	O
macOS	B-Application
operating	O
systems	O
.	O
</s>
<s>
For	O
example	O
,	O
iTunes	B-Operating_System
can	O
export	O
audio	O
in	O
WAV	O
,	O
AIFF	O
,	O
MP3	B-Application
,	O
AAC	B-Application
,	O
and	O
Apple	B-Algorithm
Lossless	I-Algorithm
.	O
</s>
<s>
In	O
addition	O
,	O
macOS	B-Application
has	O
a	O
simple	O
AppleScript	B-Application
that	O
can	O
be	O
used	O
to	O
play	O
a	O
movie	O
in	O
full-screen	O
mode	O
,	O
but	O
since	O
version	O
7.2	O
full-screen	O
viewing	O
is	O
now	O
supported	O
in	O
the	O
non-Pro	O
version	O
.	O
</s>
<s>
Encoding	B-General_Concept
and	O
transcoding	B-Algorithm
video	O
and	O
audio	O
from	O
one	O
format	O
to	O
another	O
.	O
</s>
<s>
Command-line	O
utilities	O
afconvert	O
(	O
to	O
convert	O
audio	O
formats	O
)	O
,	O
avconvert	O
(	O
to	O
convert	O
video	O
formats	O
)	O
and	O
qtmodernizer	O
(	O
to	O
automatically	O
convert	O
older	O
formats	O
to	O
H.264/AAC	O
)	O
are	O
provided	O
with	O
macOS	B-Application
for	O
power	O
users	O
.	O
</s>
<s>
Decoding	O
video	O
and	O
audio	O
,	O
then	O
sending	O
the	O
decoded	O
stream	O
to	O
the	O
graphics	B-Algorithm
or	O
audio	O
subsystem	O
for	O
playback	O
.	O
</s>
<s>
In	O
macOS	B-Application
,	O
QuickTime	O
sends	O
video	O
playback	O
to	O
the	O
Quartz	O
Extreme	O
(	O
OpenGL	O
)	O
Compositor	O
.	O
</s>
<s>
A	O
"	O
component	O
"	O
plug-in	O
architecture	O
for	O
supporting	O
additional	O
3rd-party	O
codecs	B-General_Concept
(	O
such	O
as	O
DivX	B-Application
)	O
.	O
</s>
<s>
As	O
of	O
early	O
2008	O
,	O
the	O
framework	O
hides	O
many	O
older	O
codecs	B-General_Concept
listed	O
below	O
from	O
the	O
user	O
although	O
the	O
option	O
to	O
"	O
Show	O
legacy	O
encoders	O
"	O
exists	O
in	O
QuickTime	O
Preferences	O
to	O
use	O
them	O
.	O
</s>
<s>
The	O
framework	O
supports	O
the	O
following	O
file	O
types	O
and	O
codecs	B-General_Concept
natively	O
:	O
</s>
<s>
Due	O
to	O
macOS	B-Device
Mojave	I-Device
being	O
the	O
last	O
version	O
to	O
include	O
support	O
for	O
32-bit	O
APIs	B-Application
and	O
Apple	O
's	O
plans	O
to	O
drop	O
32-bit	O
application	O
support	O
in	O
future	O
macOS	B-Application
releases	O
,	O
many	O
codecs	B-General_Concept
will	O
no	O
longer	O
be	O
supported	O
in	O
newer	O
macOS	B-Application
releases	O
,	O
starting	O
with	O
macOS	B-Device
Catalina	I-Device
,	O
which	O
was	O
released	O
on	O
October	O
7	O
,	O
2019	O
.	O
</s>
<s>
As	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
,	O
the	O
underlying	O
media	B-Library
framework	I-Library
for	O
QuickTime	O
,	O
QTKit	B-Operating_System
,	O
was	O
deprecated	O
in	O
favor	O
of	O
a	O
newer	O
graphics	B-Algorithm
framework	O
,	O
AVFoundation	B-Operating_System
,	O
and	O
completely	O
discontinued	O
as	O
of	O
macOS	B-Device
Catalina	I-Device
.	O
</s>
<s>
PictureViewer	O
is	O
a	O
component	O
of	O
QuickTime	O
for	O
Microsoft	B-Application
Windows	I-Application
and	O
the	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
and	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
operating	O
systems	O
.	O
</s>
<s>
In	O
macOS	B-Application
,	O
it	O
is	O
replaced	O
by	O
Preview	B-Language
.	O
</s>
<s>
Final	B-Operating_System
Cut	I-Operating_System
Studio	I-Operating_System
,	O
Logic	B-Application
Studio	I-Application
)	O
included	O
a	O
QuickTime	O
Pro	O
license	O
.	O
</s>
<s>
Pro	O
keys	O
are	O
specific	O
to	O
the	O
major	O
version	O
of	O
QuickTime	O
for	O
which	O
they	O
are	O
purchased	O
and	O
unlock	O
additional	O
features	O
of	O
the	O
QuickTime	O
Player	O
application	O
on	O
macOS	B-Application
or	O
Windows	B-Application
.	O
</s>
<s>
Saving	O
and	O
exporting	O
(	O
encoding	B-General_Concept
)	O
to	O
any	O
of	O
the	O
codecs	B-General_Concept
supported	O
by	O
QuickTime	O
.	O
</s>
<s>
QuickTime	O
7	O
includes	O
presets	O
for	O
exporting	O
video	O
to	O
a	O
video-capable	O
iPod	B-Device
,	O
Apple	B-Device
TV	I-Device
,	O
and	O
the	O
iPhone	B-Device
.	O
</s>
<s>
not	O
limited	O
to	O
.mov	B-Application
files	I-Application
.	O
)	O
</s>
<s>
Save	O
as	O
QuickTime	O
movie	O
–	O
This	O
option	O
will	O
save	O
the	O
embedded	O
video	O
in	O
a	O
.mov	B-Application
file	I-Application
format	O
no	O
matter	O
what	O
the	O
original	O
container	O
is/was	O
.	O
</s>
<s>
Mac	B-Device
OS	I-Device
X	I-Device
Snow	I-Device
Leopard	I-Device
includes	O
QuickTime	O
X	O
.	O
QuickTime	O
Player	O
X	O
lacks	O
cut	O
,	O
copy	O
and	O
paste	O
and	O
will	O
only	O
export	O
to	O
four	O
formats	O
,	O
but	O
its	O
limited	O
export	O
feature	O
is	O
free	O
.	O
</s>
<s>
Users	O
do	O
not	O
have	O
an	O
option	O
to	O
upgrade	O
to	O
a	O
Pro	O
version	O
of	O
QuickTime	O
X	O
,	O
but	O
those	O
who	O
have	O
already	O
purchased	O
QuickTime	O
7	O
Pro	O
and	O
are	O
upgrading	O
to	O
Snow	B-Device
Leopard	I-Device
from	O
a	O
previous	O
version	O
of	O
Mac	B-Device
OS	I-Device
X	I-Device
will	O
have	O
QuickTime	O
7	O
stored	O
in	O
the	O
Utilities	O
or	O
user	O
defined	O
folder	O
.	O
</s>
<s>
Otherwise	O
,	O
users	O
will	O
have	O
to	O
install	O
QuickTime	O
7	O
from	O
the	O
"	O
Optional	O
Installs	O
"	O
directory	O
of	O
the	O
Snow	B-Device
Leopard	I-Device
DVD	O
after	O
installing	O
the	O
OS	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
and	O
later	O
also	O
include	O
QuickTime	O
X	O
.	O
</s>
<s>
QuickTime	O
X	O
on	O
later	B-Operating_System
versions	I-Operating_System
of	I-Operating_System
macOS	I-Operating_System
support	O
cut	O
,	O
copy	O
and	O
paste	O
functions	O
similarly	O
to	O
the	O
way	O
QuickTime	O
7	O
Pro	O
did	O
;	O
the	O
interface	O
has	O
been	O
significantly	O
modified	O
to	O
simplify	O
these	O
operations	O
,	O
however	O
.	O
</s>
<s>
On	O
September	O
24	O
,	O
2018	O
,	O
Apple	O
ended	O
support	O
for	O
QuickTime	O
7	O
and	O
QuickTime	O
Pro	O
,	O
and	O
updated	O
many	O
download	O
and	O
support	O
pages	O
on	O
their	O
website	O
to	O
state	O
that	O
QuickTime	O
7	O
"	O
will	O
not	O
be	O
compatible	O
with	O
future	O
macOS	B-Application
releases.	O
"	O
</s>
<s>
The	O
native	O
file	O
format	O
for	O
QuickTime	B-Algorithm
video	I-Algorithm
,	O
QuickTime	B-Application
File	I-Application
Format	I-Application
,	O
specifies	O
a	O
multimedia	O
container	O
file	O
that	O
contains	O
one	O
or	O
more	O
tracks	O
,	O
each	O
of	O
which	O
stores	O
a	O
particular	O
type	O
of	O
data	O
:	O
audio	O
,	O
video	O
,	O
effects	O
,	O
or	O
text	O
(	O
e.g.	O
</s>
<s>
Other	O
file	O
formats	O
that	O
QuickTime	O
supports	O
natively	O
(	O
to	O
varying	O
degrees	O
)	O
include	O
AIFF	O
,	O
WAV	O
,	O
DV-DIF	O
,	O
MP3	B-Application
,	O
and	O
MPEG	O
program	O
stream	O
.	O
</s>
<s>
With	O
additional	O
QuickTime	O
Components	O
,	O
it	O
can	O
also	O
support	O
ASF	B-Application
,	O
DivX	B-Application
Media	O
Format	O
,	O
Flash	B-Operating_System
Video	I-Operating_System
,	O
Matroska	O
,	O
Ogg	O
,	O
and	O
many	O
others	O
.	O
</s>
<s>
On	O
February	O
11	O
,	O
1998	O
,	O
the	O
ISO	O
approved	O
the	O
QuickTime	B-Application
file	I-Application
format	I-Application
as	O
the	O
basis	O
of	O
the	O
MPEG‑4	O
file	O
format	O
.	O
</s>
<s>
The	O
MPEG-4	B-Algorithm
file	O
format	O
specification	O
was	O
created	O
on	O
the	O
basis	O
of	O
the	O
QuickTime	O
format	O
specification	O
published	O
in	O
2001	O
.	O
</s>
<s>
The	O
MP4	O
(	O
.mp4	O
)	O
file	O
format	O
was	O
published	O
in	O
2001	O
as	O
the	O
revision	O
of	O
the	O
MPEG-4	B-Algorithm
Part	I-Algorithm
1	I-Algorithm
:	O
Systems	O
specification	O
published	O
in	O
1999	O
(	O
ISO/IEC	O
14496-1:2001	O
)	O
.	O
</s>
<s>
In	O
2003	O
,	O
the	O
first	O
version	O
of	O
MP4	O
format	O
was	O
revised	O
and	O
replaced	O
by	O
MPEG-4	B-Algorithm
Part	O
14	O
:	O
MP4	O
file	O
format	O
(	O
ISO/IEC	O
14496-14:2003	O
)	O
.	O
</s>
<s>
It	O
in	O
turn	O
is	O
used	O
as	O
the	O
basis	O
for	O
other	O
multimedia	O
file	O
formats	O
(	O
for	O
example	O
3GP	O
,	O
Motion	B-Application
JPEG	I-Application
2000	O
)	O
.	O
</s>
<s>
This	O
registration	O
authority	O
for	O
code-points	O
in	O
"	O
MP4	O
Family	O
"	O
files	O
is	O
Apple	O
Computer	O
Inc	O
.	O
and	O
it	O
is	O
named	O
in	O
Annex	O
D	O
(	O
informative	O
)	O
in	O
MPEG-4	B-Algorithm
Part	O
12	O
.	O
</s>
<s>
By	O
2000	O
,	O
MPEG-4	B-Algorithm
formats	O
became	O
industry	O
standards	O
,	O
first	O
appearing	O
with	O
support	O
in	O
QuickTime	O
6	O
in	O
2002	O
.	O
</s>
<s>
Accordingly	O
,	O
the	O
MPEG-4	B-Algorithm
container	O
is	O
designed	O
to	O
capture	O
,	O
edit	O
,	O
archive	B-Application
,	O
and	O
distribute	O
media	O
,	O
unlike	O
the	O
simple	O
file-as-stream	O
approach	O
of	O
MPEG-1	B-Algorithm
and	O
MPEG-2	B-Algorithm
.	O
</s>
<s>
QuickTime	O
6	O
added	O
limited	O
support	O
for	O
MPEG-4	B-Algorithm
,	O
specifically	O
encoding	B-General_Concept
and	O
decoding	O
using	O
Simple	O
Profile	O
(	O
SP	O
)	O
.	O
</s>
<s>
Advanced	O
Simple	O
Profile	O
(	O
ASP	O
)	O
features	O
,	O
like	O
B-frames	B-General_Concept
,	O
were	O
unsupported	O
(	O
in	O
contrast	O
with	O
,	O
for	O
example	O
,	O
encoders	O
such	O
as	O
XviD	B-Algorithm
or	O
3ivx	B-Algorithm
)	O
.	O
</s>
<s>
QuickTime	O
7	O
supports	O
the	O
H.264	B-Application
encoder	O
and	O
decoder	O
.	O
</s>
<s>
Because	O
both	O
MOV	O
and	O
MP4	O
containers	O
can	O
use	O
the	O
same	O
MPEG-4	B-Algorithm
codecs	B-General_Concept
,	O
they	O
are	O
mostly	O
interchangeable	O
in	O
a	O
QuickTime-only	O
environment	O
.	O
</s>
<s>
This	O
is	O
especially	O
true	O
on	O
hardware	O
devices	O
,	O
such	O
as	O
the	O
Sony	B-Operating_System
PSP	I-Operating_System
and	O
various	O
DVD	O
players	O
,	O
on	O
the	O
software	O
side	O
,	O
most	O
DirectShow	B-Library
/	O
Video	B-Device
for	I-Device
Windows	I-Device
codec	B-General_Concept
packs	I-General_Concept
include	O
a	O
MP4	O
parser	O
,	O
but	O
not	O
one	O
for	O
MOV	O
.	O
</s>
<s>
In	O
QuickTime	O
Pro	O
's	O
MPEG-4	B-Algorithm
Export	O
dialog	O
,	O
an	O
option	O
called	O
"	O
Passthrough	O
"	O
allows	O
a	O
clean	O
export	O
to	O
MP4	O
without	O
affecting	O
the	O
audio	O
or	O
video	O
streams	O
.	O
</s>
<s>
QuickTime	O
7	O
now	O
supports	O
multi-channel	O
AAC-LC	B-Application
and	O
HE-AAC	O
audio	O
(	O
used	O
,	O
for	O
example	O
,	O
in	O
the	O
high-definition	O
trailers	O
on	O
Apple	O
's	O
site	O
)	O
,	O
for	O
both	O
.MOV	B-Application
and	O
.MP4	O
containers	O
.	O
</s>
<s>
Apple	O
released	O
the	O
first	O
version	O
of	O
QuickTime	O
on	O
December	O
2	O
,	O
1991	O
as	O
a	O
multimedia	O
add-on	O
for	O
System	B-Operating_System
6	I-Operating_System
and	O
later	O
.	O
</s>
<s>
The	O
original	O
video	B-Application
codecs	I-Application
included	O
:	O
</s>
<s>
the	O
Apple	B-Algorithm
Video	I-Algorithm
codec	B-General_Concept
(	O
also	O
known	O
as	O
"	O
Road	O
Pizza	O
"	O
)	O
,	O
suited	O
to	O
normal	O
live-action	O
video	O
.	O
</s>
<s>
The	O
first	O
publicly	O
visible	O
use	O
of	O
QuickTime	O
was	O
Ben	O
&	O
Jerry	O
's	O
interactive	B-General_Concept
factory	O
tour	O
(	O
dubbed	O
The	O
Rik	O
&	O
Joe	O
Show	O
after	O
its	O
in-house	O
developers	O
)	O
.	O
</s>
<s>
Apple	O
released	O
QuickTime	O
1.5	O
for	O
Mac	B-Application
OS	I-Application
in	O
the	O
latter	O
part	O
of	O
1992	O
.	O
</s>
<s>
This	O
added	O
the	O
SuperMac-developed	O
Cinepak	B-Algorithm
vector-quantization	O
video	B-Application
codec	I-Application
(	O
initially	O
known	O
as	O
Compact	O
Video	O
)	O
.	O
</s>
<s>
It	O
could	O
play	O
video	O
at	O
320×240	O
resolution	O
at	O
30	O
frames	O
per	O
second	O
on	O
a	O
25MHz	O
Motorola	B-Device
68040	I-Device
CPU	O
.	O
</s>
<s>
Apple	O
contracted	O
San	O
Francisco	O
Canyon	O
Company	O
to	O
port	O
QuickTime	O
to	O
the	O
Windows	B-Application
platform	O
.	O
</s>
<s>
Version	O
1.0	O
of	O
QuickTime	O
for	O
Windows	B-Application
provided	O
only	O
a	O
subset	O
of	O
the	O
full	O
QuickTime	O
API	B-Application
,	O
including	O
only	O
movie	O
playback	O
functions	O
driven	O
through	O
the	O
standard	O
movie	O
controller	O
.	O
</s>
<s>
Version	O
1.6.2	O
first	O
incorporated	O
the	O
"	O
QuickTime	O
PowerPlug	O
"	O
which	O
replaced	O
some	O
components	O
with	O
PowerPC-native	O
code	O
when	O
running	O
on	O
PowerPC	B-Architecture
Macs	O
.	O
</s>
<s>
Apple	O
released	O
QuickTime	O
2.0	O
for	O
System	B-Application
Software	I-Application
7	O
in	O
June	O
1994	O
—	O
the	O
only	O
version	O
never	O
released	O
for	O
free	O
.	O
</s>
<s>
Following	O
Bruce	O
Leak	O
's	O
departure	O
to	O
Web	B-Device
TV	I-Device
,	O
the	O
leadership	O
of	O
the	O
QuickTime	O
team	O
was	O
taken	O
over	O
by	O
Peter	O
Hoddie	O
.	O
</s>
<s>
QuickTime	O
2.0	O
for	O
Windows	B-Application
appeared	O
in	O
November	O
1994	O
under	O
the	O
leadership	O
of	O
Paul	O
Charlton	O
.	O
</s>
<s>
The	O
QTML	O
later	O
became	O
the	O
foundation	O
for	O
the	O
Carbon	O
API	B-Application
which	O
allowed	O
legacy	O
Macintosh	O
applications	O
to	O
run	O
on	O
the	O
Darwin	O
kernel	O
in	O
Mac	B-Device
OS	I-Device
X	I-Device
.	O
</s>
<s>
QuickTime	O
2.5	O
also	O
fully	O
integrated	O
QuickTime	B-Application
VR	I-Application
2.0.1	O
into	O
QuickTime	O
as	O
a	O
QuickTime	O
extension	O
.	O
</s>
<s>
On	O
January	O
16	O
,	O
1997	O
,	O
Apple	O
released	O
the	O
QuickTime	O
MPEG	O
Extension	O
(	O
PPC	O
only	O
)	O
as	O
an	O
add-on	O
to	O
QuickTime	O
2.5	O
,	O
which	O
added	O
software	O
MPEG-1	B-Algorithm
playback	O
capabilities	O
to	O
QuickTime	O
.	O
</s>
<s>
Apple	O
alleged	O
that	O
San	O
Francisco	O
Canyon	O
had	O
helped	O
develop	O
Video	B-Device
for	I-Device
Windows	I-Device
using	O
several	O
hundred	O
lines	O
of	O
unlicensed	O
QuickTime	O
source	O
code	O
.	O
</s>
<s>
They	O
were	O
contracted	O
by	O
Intel	O
to	O
help	O
make	O
Video	B-Device
for	I-Device
Windows	I-Device
better	O
use	O
system	O
resources	O
on	O
Intel	O
processors	O
,	O
which	O
was	O
subsequently	O
unilaterally	O
removed	O
.	O
</s>
<s>
The	O
release	O
of	O
QuickTime	O
3.0	O
for	O
Mac	B-Application
OS	I-Application
on	O
March	O
30	O
,	O
1998	O
introduced	O
the	O
now-standard	O
revenue	O
model	O
of	O
releasing	O
the	O
software	O
for	O
free	O
,	O
but	O
with	O
additional	O
features	O
of	O
the	O
Apple-provided	O
MoviePlayer	O
application	O
that	O
end-users	O
could	O
only	O
unlock	O
by	O
buying	O
a	O
QuickTime	O
Pro	O
license	O
code	O
.	O
</s>
<s>
Since	O
the	O
"	O
Pro	O
"	O
features	O
were	O
the	O
same	O
as	O
the	O
existing	O
features	O
in	O
QuickTime	O
2.5	O
,	O
any	O
previous	O
user	O
of	O
QuickTime	O
could	O
continue	O
to	O
use	O
an	O
older	O
version	O
of	O
the	O
central	O
MoviePlayer	O
application	O
for	O
the	O
remaining	O
lifespan	O
of	O
Mac	B-Application
OS	I-Application
to	O
2002	O
,	O
indeed	O
,	O
since	O
these	O
additional	O
features	O
were	O
limited	O
to	O
MoviePlayer	O
,	O
any	O
other	O
QuickTime-compatible	O
application	O
remained	O
unaffected	O
.	O
</s>
<s>
QuickTime	O
3.0	O
added	O
support	O
for	O
graphics	B-Algorithm
importer	O
components	O
that	O
could	O
read	O
images	O
from	O
GIF	O
,	O
JPEG	O
,	O
TIFF	O
,	O
and	O
other	O
file	O
formats	O
,	O
and	O
video	O
output	O
components	O
which	O
served	O
primarily	O
to	O
export	O
movie	O
data	O
via	O
FireWire	O
.	O
</s>
<s>
Apple	O
also	O
licensed	O
several	O
third-party	O
technologies	O
for	O
inclusion	O
in	O
QuickTime	O
3.0	O
,	O
including	O
the	O
Sorenson	O
Video	B-Application
codec	I-Application
for	O
advanced	O
video	O
compression	O
,	O
the	O
QDesign	O
Music	O
codec	B-General_Concept
for	O
substantial	O
audio	O
compression	O
,	O
and	O
the	O
complete	O
Roland	O
Sound	O
Canvas	O
instrument	O
set	O
and	O
GS	O
Format	O
extensions	O
for	O
improved	O
playback	O
of	O
MIDI	O
music	O
files	O
.	O
</s>
<s>
Some	O
of	O
these	O
effects	O
would	O
even	O
respond	O
to	O
mouse	O
clicks	O
by	O
the	O
user	O
,	O
as	O
part	O
of	O
the	O
new	O
movie	O
interaction	B-General_Concept
support	O
(	O
known	O
as	O
wired	O
movies	O
)	O
.	O
</s>
<s>
During	O
the	O
development	O
cycle	O
for	O
QuickTime	O
3.0	O
,	O
part	O
of	O
the	O
engineering	O
team	O
was	O
working	O
on	O
a	O
more	O
advanced	O
version	O
of	O
QuickTime	O
to	O
be	O
known	O
as	O
QuickTime	O
interactive	B-General_Concept
or	O
QTi	O
.	O
</s>
<s>
Although	O
similar	O
in	O
concept	O
to	O
the	O
wired	O
movies	O
feature	O
released	O
as	O
part	O
of	O
QuickTime	O
3.0	O
,	O
QuickTime	O
interactive	B-General_Concept
was	O
much	O
more	O
ambitious	O
.	O
</s>
<s>
It	O
allowed	O
any	O
QuickTime	O
movie	O
to	O
be	O
a	O
fully	O
interactive	B-General_Concept
and	O
programmable	O
container	O
for	O
media	O
.	O
</s>
<s>
A	O
special	O
track	O
type	O
was	O
added	O
that	O
contained	O
an	O
interpreter	O
for	O
a	O
custom	O
programming	O
language	O
based	O
on	O
68000	O
assembly	B-Language
language	I-Language
.	O
</s>
<s>
This	O
supported	O
a	O
comprehensive	O
user	O
interaction	B-General_Concept
model	O
for	O
mouse	O
and	O
keyboard	O
event	O
handling	O
based	O
in	O
part	O
on	O
the	O
AML	O
language	O
from	O
the	O
Apple	B-Application
Media	I-Application
Tool	I-Application
.	O
</s>
<s>
The	O
QuickTime	O
interactive	B-General_Concept
movie	O
was	O
to	O
have	O
been	O
the	O
playback	O
format	O
for	O
the	O
next	O
generation	O
of	O
HyperCard	B-Application
authoring	O
tool	O
.	O
</s>
<s>
Both	O
the	O
QuickTime	O
interactive	B-General_Concept
and	O
the	O
HyperCard	B-Application
3.0	O
projects	O
were	O
canceled	O
in	O
order	O
to	O
concentrate	O
engineering	O
resources	O
on	O
streaming	O
support	O
for	O
QuickTime	O
4.0	O
,	O
and	O
the	O
projects	O
were	O
never	O
released	O
to	O
the	O
public	O
.	O
</s>
<s>
Apple	O
released	O
QuickTime	O
4.0	O
on	O
June	O
8	O
,	O
1999	O
for	O
Mac	O
OS	O
7.5.5	O
through	O
8.6	O
(	O
later	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
)	O
and	O
Windows	B-Application
95	I-Application
,	O
Windows	B-Device
98	I-Device
,	O
and	O
Windows	B-Device
NT	I-Device
.	O
</s>
<s>
Graphics	B-Algorithm
exporter	O
components	O
,	O
which	O
could	O
write	O
some	O
of	O
the	O
same	O
formats	O
that	O
the	O
previously	O
introduced	O
importers	O
could	O
read	O
.	O
</s>
<s>
Support	O
for	O
the	O
QDesign	O
Music	O
2	O
and	O
MPEG-1	B-Application
Layer	I-Application
3	I-Application
audio	O
(	O
MP3	B-Application
)	O
.	O
</s>
<s>
It	O
was	O
accompanied	O
by	O
the	O
release	O
of	O
the	O
free	O
QuickTime	B-Operating_System
Streaming	I-Operating_System
Server	I-Operating_System
version	O
1.0	O
.	O
</s>
<s>
Support	O
for	O
files	O
larger	O
than	O
2.0	O
GB	O
in	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
.	O
</s>
<s>
(	O
This	O
is	O
a	O
consequence	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
requiring	O
the	O
HFS	B-Application
Plus	I-Application
filesystem	O
.	O
)	O
</s>
<s>
Variable	B-General_Concept
bit	I-General_Concept
rate	I-General_Concept
(	O
VBR	O
)	O
support	O
for	O
MPEG-1	B-Application
Layer	I-Application
3	I-Application
(	O
MP3	B-Application
)	O
audio	O
.	O
</s>
<s>
Support	O
for	O
Synchronized	B-Language
Multimedia	I-Language
Integration	I-Language
Language	I-Language
(	O
SMIL	O
)	O
.	O
</s>
<s>
Introduction	O
of	O
AppleScript	B-Application
support	O
in	O
Mac	B-Application
OS	I-Application
.	O
</s>
<s>
The	O
requirement	O
of	O
a	O
PowerPC	B-Architecture
processor	I-Architecture
for	O
Mac	B-Application
OS	I-Application
systems	O
.	O
</s>
<s>
QuickTime	O
4.1	O
dropped	O
support	O
for	O
Motorola	B-Device
68k	I-Device
Macintosh	B-Application
systems	I-Application
.	O
</s>
<s>
This	O
version	O
was	O
the	O
last	O
to	O
have	O
greater	O
capabilities	O
under	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
than	O
under	O
Mac	B-Device
OS	I-Device
X	I-Device
,	O
and	O
the	O
last	O
version	O
of	O
QuickTime	O
to	O
support	O
Mac	B-Application
OS	I-Application
versions	O
7.5.5	O
through	O
8.5.1	B-Operating_System
on	O
a	O
PowerPC	B-Architecture
Mac	O
and	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
Version	O
5.0	O
was	O
initially	O
only	O
released	O
for	O
Mac	B-Application
OS	I-Application
and	O
Mac	B-Device
OS	I-Device
X	I-Device
on	O
April	O
14	O
,	O
2001	O
,	O
and	O
version	O
5.0.1	O
followed	O
shortly	O
thereafter	O
on	O
April	O
23	O
,	O
2001	O
,	O
supporting	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
Mac	B-Device
OS	I-Device
X	I-Device
,	O
and	O
Windows	B-Application
.	O
</s>
<s>
MPEG-1	B-Algorithm
playback	O
for	O
Windows	B-Application
,	O
and	O
updated	O
MPEG-1	B-Application
Layer	I-Application
3	I-Application
audio	O
support	O
for	O
all	O
systems	O
.	O
</s>
<s>
Realtime	O
rendering	O
of	O
effects	O
&	O
transitions	O
in	O
DV	O
files	O
,	O
including	O
enhancements	O
to	O
DV	O
rendering	O
,	O
multiprocessor	O
support	O
,	O
and	O
Altivec	O
enhancements	O
for	O
PowerPC	B-General_Concept
G4	I-General_Concept
systems	O
.	O
</s>
<s>
Flash	B-Operating_System
4	O
playback	O
and	O
export	O
.	O
</s>
<s>
A	O
new	O
QuickTime	B-Application
VR	I-Application
engine	O
,	O
adding	O
support	O
for	O
cubic	O
VR	O
panoramas	O
.	O
</s>
<s>
MPEG-4	B-Algorithm
playback	O
,	O
import	O
,	O
and	O
export	O
,	O
including	O
MPEG-4	B-Application
Part	I-Application
2	I-Application
video	O
and	O
AAC	B-Application
Audio	I-Application
.	O
</s>
<s>
Support	O
for	O
Flash	B-Operating_System
5	O
,	O
JPEG	O
2000	O
,	O
and	O
improved	O
Exif	O
handling	O
.	O
</s>
<s>
MPEG-2	B-Algorithm
playback	O
(	O
via	O
the	O
purchase	O
of	O
Apple	O
's	O
MPEG-2	B-Algorithm
Playback	O
Component	O
)	O
.	O
</s>
<s>
Scriptable	O
ActiveX	B-Application
control	I-Application
.	O
</s>
<s>
QuickTime	O
6	O
was	O
initially	O
available	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
8.6	I-Operating_System
–	O
9.x	O
,	O
Mac	B-Device
OS	I-Device
X	I-Device
(	O
10.1.5	O
minimum	O
)	O
,	O
and	O
Windows	B-Device
98	I-Device
,	O
Me	B-Device
,	O
2000	O
,	O
and	O
XP	B-Application
.	O
</s>
<s>
Development	O
of	O
QuickTime	O
6	O
for	O
Mac	B-Application
OS	I-Application
slowed	O
considerably	O
in	O
early	O
2003	O
,	O
after	O
the	O
release	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
in	O
August	O
2002	O
.	O
</s>
<s>
QuickTime	O
6	O
for	O
Mac	B-Application
OS	I-Application
continued	O
on	O
the	O
6.0.x	O
path	O
,	O
eventually	O
stopping	O
with	O
version	O
6.0.3	O
.	O
</s>
<s>
QuickTime	O
6.1	O
&	O
6.1.1	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.1	I-Operating_System
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
(	O
released	O
October	O
22	O
,	O
2002	O
)	O
and	O
QuickTime	O
6.1	O
for	O
Windows	B-Application
(	O
released	O
March	O
31	O
,	O
2003	O
)	O
offered	O
ISO-Compliant	O
MPEG-4	B-Algorithm
file	O
creation	O
and	O
fixed	O
the	O
vulnerability	O
.	O
</s>
<s>
Apple	O
released	O
QuickTime	O
6.2	O
exclusively	O
for	O
Mac	B-Device
OS	I-Device
X	I-Device
on	O
April	O
29	O
,	O
2003	O
to	O
provide	O
support	O
for	O
iTunes	B-Operating_System
4	O
,	O
which	O
allowed	O
AAC	B-Application
encoding	B-General_Concept
for	O
songs	O
in	O
the	O
iTunes	B-Operating_System
library	O
.	O
</s>
<s>
(	O
iTunes	B-Operating_System
was	O
not	O
available	O
for	O
Windows	B-Application
until	O
October	O
2003	O
.	O
)	O
</s>
<s>
Support	O
for	O
3GPP	O
,	O
including	O
3G	B-Architecture
Text	O
,	O
video	O
,	O
and	O
audio	O
(	O
AAC	B-Application
and	O
AMR	B-Algorithm
codecs	B-General_Concept
)	O
.	O
</s>
<s>
Support	O
for	O
the	O
.3gp	O
,	O
.amr	B-Algorithm
,	O
and	O
.sdv	O
file	O
formats	O
via	O
separate	O
component	O
.	O
</s>
<s>
QuickTime	O
6.4	O
,	O
released	O
on	O
October	O
16	O
,	O
2003	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.3	I-Operating_System
,	O
and	O
Windows	B-Application
,	O
added	O
the	O
following	O
:	O
</s>
<s>
Addition	O
of	O
the	O
Apple	O
Pixlet	B-Algorithm
codec	B-General_Concept
(	O
only	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.3	I-Operating_System
and	O
later	O
)	O
.	O
</s>
<s>
These	O
versions	O
would	O
be	O
the	O
last	O
to	O
support	O
Windows	B-Device
98	I-Device
and	O
Me	B-Device
.	O
</s>
<s>
QCELP	B-Algorithm
voice	O
code	O
.	O
</s>
<s>
Apple	B-Algorithm
Lossless	I-Algorithm
(	O
in	O
version	O
6.5.1	O
)	O
.	O
</s>
<s>
Initially	O
released	O
on	O
April	O
29	O
,	O
2005	O
in	O
conjunction	O
with	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
(	O
for	O
version	O
10.3.9	O
and	O
10.4.x	O
)	O
,	O
QuickTime	O
7.0	O
featured	O
the	O
following	O
:	O
</s>
<s>
Improved	O
MPEG-4	B-Algorithm
compliance	O
.	O
</s>
<s>
A	O
H.264/MPEG	B-Application
-4	I-Application
AVC	I-Application
codec	B-General_Concept
(	O
does	O
not	O
support	O
the	O
AVCHD	O
H.264	B-Application
AVC	I-Application
format	O
from	O
Sony	O
HD	O
camcorders	O
)	O
.	O
</s>
<s>
Support	O
for	O
Core	B-Operating_System
Audio	I-Operating_System
,	O
a	O
set	O
of	O
Application	B-Application
programming	I-Application
interfaces	I-Application
that	O
supports	O
high	O
resolution	O
sound	O
and	O
replaces	O
Sound	B-Operating_System
Manager	I-Operating_System
.	O
</s>
<s>
Support	O
for	O
using	O
Core	B-Operating_System
Image	I-Operating_System
filters	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
on	O
live	O
video	O
(	O
Not	O
to	O
be	O
confused	O
with	O
Core	B-Operating_System
Video	I-Operating_System
)	O
.	O
</s>
<s>
Support	O
for	O
Quartz	B-Operating_System
Composer	I-Operating_System
(	O
.qtz	O
)	O
animations	O
.	O
</s>
<s>
QuickTime	O
Kit	O
Framework	O
(	O
QTKit	B-Operating_System
)	O
,	O
a	O
Cocoa	B-Operating_System
framework	O
for	O
QuickTime	O
.	O
</s>
<s>
After	O
a	O
couple	O
of	O
preview	B-Language
Windows	B-Application
releases	O
,	O
Apple	O
released	O
7.0.2	O
as	O
the	O
first	O
stable	O
release	O
on	O
September	O
7	O
,	O
2005	O
for	O
Windows	B-Application
2000	I-Application
and	O
Windows	B-Application
XP	I-Application
.	O
</s>
<s>
Version	O
7.0.4	O
,	O
released	O
on	O
January	O
10	O
,	O
2006	O
was	O
the	O
first	O
universal	B-Operating_System
binary	I-Operating_System
version	O
.	O
</s>
<s>
But	O
it	O
suffered	O
numerous	O
bugs	O
,	O
including	O
a	O
buffer	B-General_Concept
overrun	I-General_Concept
,	O
which	O
is	O
more	O
problematic	O
to	O
most	O
users	O
.	O
</s>
<s>
Apple	O
dropped	O
support	O
for	O
Windows	B-Application
2000	I-Application
with	O
the	O
release	O
of	O
QuickTime	O
7.2	O
on	O
July	O
11	O
,	O
2007	O
.	O
</s>
<s>
The	O
last	O
version	O
available	O
for	O
Windows	B-Application
2000	I-Application
,	O
7.1.6	O
,	O
contains	O
numerous	O
security	O
vulnerabilities	O
.	O
</s>
<s>
QuickTime	O
7.2	O
is	O
the	O
first	O
version	O
for	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
Apple	O
dropped	O
support	O
for	O
Flash	B-Operating_System
content	O
in	O
QuickTime	O
7.3	O
,	O
breaking	O
content	O
that	O
relied	O
on	O
Flash	B-Operating_System
for	O
interactivity	B-General_Concept
,	O
or	O
animation	O
tracks	O
.	O
</s>
<s>
Flash	B-Operating_System
flv	B-Operating_System
files	I-Operating_System
can	O
still	O
be	O
played	O
in	O
QuickTime	O
if	O
the	O
free	O
Perian	B-Operating_System
plugin	O
is	O
added	O
.	O
</s>
<s>
In	O
QuickTime	O
7.3	O
,	O
a	O
processor	B-General_Concept
that	O
supports	O
SSE	B-General_Concept
is	O
required	O
.	O
</s>
<s>
QuickTime	O
7.4	O
does	O
not	O
require	O
SSE	B-General_Concept
.	O
</s>
<s>
Unlike	O
versions	O
7.2	O
and	O
7.3	O
,	O
QuickTime	O
7.4	O
cannot	O
be	O
installed	O
on	O
Windows	B-Application
XP	I-Application
without	O
service	O
packs	O
or	O
with	O
Service	O
Pack	O
1/1A	O
installed	O
(	O
its	O
setup	O
program	O
checks	O
if	O
Service	O
Pack	O
2	O
is	O
installed	O
)	O
.	O
</s>
<s>
QuickTime	O
7.5.5	O
was	O
released	O
on	O
September	O
9	B-Operating_System
,	O
2008	O
,	O
which	O
requires	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
or	O
higher	O
,	O
dropping	O
10.3	B-Operating_System
support	O
.	O
</s>
<s>
QuickTime	O
7.6.6	O
is	O
available	O
for	O
OS	O
X	O
,	O
10.6.3	O
Snow	B-Device
Leopard	I-Device
until	O
10.14	O
Mojave	B-Device
,	O
as	O
10.15	O
Catalina	O
will	O
only	O
support	O
64-bit	O
applications	O
.	O
</s>
<s>
There	O
is	O
a	O
7.7	O
release	O
of	O
QuickTime	O
7	O
for	O
OS	O
X	O
,	O
but	O
it	O
is	O
only	O
for	O
Leopard	B-Application
10.5	O
.	O
</s>
<s>
QuickTime	O
7.7.6	O
is	O
the	O
last	O
release	O
for	O
Windows	B-Application
XP	I-Application
.	O
</s>
<s>
QuickTime	O
7.7.9	O
is	O
the	O
last	O
Windows	B-Application
release	O
of	O
QuickTime	O
.	O
</s>
<s>
Apple	O
stopped	O
supporting	O
QuickTime	O
on	O
Windows	B-Application
afterwards	O
.	O
</s>
<s>
Safari	O
12	O
,	O
released	O
on	O
September	O
17	O
,	O
2018	O
for	O
macOS	B-Operating_System
Sierra	I-Operating_System
and	O
macOS	B-Operating_System
High	I-Operating_System
Sierra	I-Operating_System
(	O
and	O
the	O
default	O
browser	O
included	O
on	O
macOS	B-Device
Mojave	I-Device
released	O
on	O
September	O
24	O
,	O
2018	O
)	O
,	O
which	O
drops	O
support	O
for	O
NPAPI	O
plug-ins	O
(	O
except	O
for	O
Adobe	B-Operating_System
Flash	I-Operating_System
)	O
dropped	O
its	O
support	O
for	O
QuickTime	O
7	O
's	O
web	O
plugin	O
.	O
</s>
<s>
On	O
September	O
24	O
,	O
2018	O
,	O
Apple	O
dropped	O
support	O
for	O
the	O
macOS	B-Application
version	O
of	O
QuickTime	O
7	O
.	O
</s>
<s>
This	O
effectively	O
marked	O
the	O
end	O
of	O
the	O
technology	O
in	O
Apple	O
's	O
codec	B-General_Concept
and	O
web	O
development	O
.	O
</s>
<s>
Starting	O
with	O
macOS	B-Device
Catalina	I-Device
,	O
QuickTime	O
7	O
applications	O
,	O
image	O
,	O
audio	O
and	O
video	B-Application
codecs	I-Application
will	O
no	O
longer	O
be	O
compatible	O
with	O
macOS	B-Application
or	O
supported	O
by	O
Apple	O
.	O
</s>
<s>
QuickTime	O
X	O
(	O
pronounced	O
QuickTime	O
Ten	O
)	O
was	O
initially	O
demonstrated	O
at	O
WWDC	O
on	O
June	O
8	O
,	O
2009	O
,	O
and	O
shipped	O
with	O
Mac	B-Device
OS	I-Device
X	I-Device
v10.6	I-Device
.	O
</s>
<s>
It	O
includes	O
visual	O
chapters	O
,	O
conversion	O
,	O
sharing	O
to	O
YouTube	B-General_Concept
,	O
video	O
editing	O
,	O
capture	O
of	O
video	O
and	O
audio	O
streams	O
,	O
screen	O
recording	O
,	O
GPU	O
acceleration	O
,	O
and	O
live	O
streaming	O
.	O
</s>
<s>
This	O
includes	O
iTunes/Apple	O
TV	O
video	O
purchases	O
,	O
or	O
any	O
content	O
protected	O
by	O
Apple	O
's	O
FairPlay	B-Operating_System
DRM	I-Operating_System
technology	O
.	O
</s>
<s>
While	O
Safari	O
uses	O
FairPlay	B-Operating_System
,	O
Google	B-Application
Chrome	I-Application
,	O
and	O
Firefox	B-Application
use	O
Widevine	O
for	O
DRM	O
,	O
whose	O
content	O
is	O
not	O
protected	O
from	O
QuickTime	O
screen	O
capturing	O
.	O
</s>
<s>
The	O
reason	O
for	O
the	O
jump	O
in	O
numbering	O
from	O
7	O
to	O
10	O
(	O
X	O
)	O
was	O
to	O
indicate	O
a	O
similar	O
break	O
with	O
the	O
previous	O
versions	O
of	O
the	O
product	O
that	O
Mac	B-Device
OS	I-Device
X	I-Device
indicated	O
.	O
</s>
<s>
QuickTime	O
X	O
is	O
fundamentally	O
different	O
from	O
previous	O
versions	O
,	O
in	O
that	O
it	O
is	O
provided	O
as	O
a	O
Cocoa	B-Operating_System
(	O
Objective-C	B-Language
)	O
framework	O
and	O
breaks	O
compatibility	O
with	O
the	O
previous	O
QuickTime	O
7	O
C-based	O
APIs	B-Application
that	O
were	O
previously	O
used	O
.	O
</s>
<s>
QuickTime	O
X	O
was	O
completely	O
rewritten	O
to	O
implement	O
modern	O
audio	O
video	B-Application
codecs	I-Application
in	O
64-bit	O
.	O
</s>
<s>
QuickTime	O
X	O
is	O
a	O
combination	O
of	O
two	O
technologies	O
:	O
QuickTime	O
Kit	O
Framework	O
(	O
QTKit	B-Operating_System
)	O
and	O
QuickTime	O
X	O
Player	O
.	O
</s>
<s>
QTKit	B-Operating_System
is	O
used	O
by	O
QuickTime	O
player	O
to	O
display	O
media	O
.	O
</s>
<s>
QuickTime	O
X	O
does	O
not	O
implement	O
all	O
of	O
the	O
functionality	O
of	O
the	O
previous	O
QuickTime	O
as	O
well	O
as	O
some	O
of	O
the	O
codecs	B-General_Concept
.	O
</s>
<s>
When	O
QuickTime	O
X	O
attempts	O
to	O
operate	O
with	O
a	O
32-bit	O
codec	B-General_Concept
or	O
perform	O
an	O
operation	O
not	O
supported	O
by	O
QuickTime	O
X	O
,	O
it	O
will	O
start	O
a	O
32-bit	O
helper	O
process	O
to	O
perform	O
the	O
requested	O
operation	O
.	O
</s>
<s>
The	O
website	O
Ars	O
Technica	O
revealed	O
that	O
QuickTime	O
X	O
uses	O
QuickTime	O
7.x	O
via	O
QTKit	B-Operating_System
to	O
run	O
older	O
codecs	B-General_Concept
that	O
have	O
not	O
made	O
the	O
transition	O
to	O
64-bit	O
.	O
</s>
<s>
It	O
has	O
been	O
suggested	O
using	O
the	O
program	O
Subler	O
to	O
interleave	O
the	O
MP4	O
and	O
SRT	O
files	O
will	O
fix	O
this	O
oversight	O
,	O
which	O
can	O
be	O
downloaded	O
at	O
Bitbucket	B-Protocol
.	O
</s>
<s>
QuickTime	O
7	O
may	O
still	O
be	O
required	O
to	O
support	O
older	O
formats	O
on	O
Snow	B-Device
Leopard	I-Device
such	O
as	O
QTVR	B-Application
,	O
interactive	B-General_Concept
QuickTime	O
movies	O
,	O
and	O
MIDI	O
files	O
.	O
</s>
<s>
In	O
such	O
cases	O
,	O
a	O
compatible	O
version	O
of	O
QuickTime	O
7	O
is	O
included	O
on	O
Snow	B-Device
Leopard	I-Device
installation	O
disc	O
and	O
may	O
be	O
installed	O
side-by-side	O
with	O
QuickTime	O
X	O
.	O
</s>
<s>
A	O
Snow	B-Device
Leopard	I-Device
compatible	O
version	O
of	O
QuickTime	O
7	O
may	O
also	O
be	O
downloaded	O
from	O
Apple	O
Support	O
website	O
.	O
</s>
<s>
It	O
contains	O
more	O
sharing	O
options	O
(	O
email	O
,	O
YouTube	B-General_Concept
,	O
Facebook	B-Application
,	O
Flickr	B-Algorithm
etc	O
.	O
</s>
<s>
)	O
,	O
more	O
export	O
options	O
(	O
including	O
web	O
export	O
in	O
multiple	O
sizes	O
,	O
and	O
export	O
for	O
iPhone	B-Device
4/iPad/Apple	O
TV	O
(	O
but	O
not	O
Apple	B-Device
TV	I-Device
2	O
)	O
.	O
</s>
<s>
Starting	O
with	O
macOS	B-Device
Catalina	I-Device
,	O
Apple	O
only	O
provides	O
QuickTime	O
X	O
,	O
as	O
QuickTime	O
7	O
was	O
never	O
updated	O
to	O
64-bit	O
,	O
affecting	O
many	O
applications	O
,	O
image	O
,	O
audio	O
,	O
and	O
video	O
formats	O
utilizing	O
QuickTime	O
7	O
,	O
and	O
compatibility	O
with	O
these	O
codecs	B-General_Concept
in	O
QuickTime	O
X	O
.	O
</s>
<s>
QuickTime	O
X	O
previously	O
provided	O
the	O
QTKit	B-Operating_System
Framework	O
on	O
Mac	B-Device
OS	I-Device
10.6	I-Device
until	O
10.14	O
.	O
</s>
<s>
Since	O
the	O
release	O
of	O
macOS	B-Device
10.15	I-Device
,	O
AVKit	O
and	O
AVFoundation	B-Operating_System
are	O
used	O
instead	O
(	O
due	O
to	O
the	O
removal	O
of	O
32-bit	O
audio	O
and	O
video	B-Application
codecs	I-Application
,	O
as	O
well	O
as	O
image	O
formats	O
and	O
APIs	B-Application
supported	O
by	O
QuickTime	O
7	O
)	O
.	O
</s>
<s>
The	O
Movie	O
Toolbox	O
consists	O
of	O
a	O
general	O
API	B-Application
for	O
handling	O
time-based	O
data	O
,	O
while	O
the	O
Image	O
Compression	O
Manager	O
provides	O
services	O
for	O
dealing	O
with	O
compressed	O
raster	B-Algorithm
data	O
as	O
produced	O
by	O
video	O
and	O
photo	O
codecs	B-General_Concept
.	O
</s>
<s>
Developers	O
can	O
use	O
the	O
QuickTime	O
software	B-Application
development	I-Application
kit	I-Application
(	O
SDK	B-Application
)	O
to	O
develop	O
multimedia	O
applications	O
for	O
Mac	O
or	O
Windows	B-Application
with	O
the	O
C	B-Language
programming	I-Language
language	I-Language
or	O
with	O
the	O
Java	O
programming	O
language	O
(	O
see	O
QuickTime	B-Language
for	I-Language
Java	I-Language
)	O
,	O
or	O
,	O
under	O
Windows	B-Application
,	O
using	O
COM/ActiveX	B-Application
from	O
a	O
language	O
supporting	O
this	O
.	O
</s>
<s>
The	O
COM/ActiveX	B-Application
option	O
was	O
introduced	O
as	O
part	O
of	O
QuickTime	O
7	O
for	O
Windows	B-Application
and	O
is	O
intended	O
for	O
programmers	O
who	O
want	O
to	O
build	O
standalone	O
Windows	B-Application
applications	I-Application
using	O
high-level	O
QuickTime	O
movie	O
playback	O
and	O
control	O
with	O
some	O
import	O
,	O
export	O
,	O
and	O
editing	O
capabilities	O
.	O
</s>
<s>
This	O
is	O
considerably	O
easier	O
than	O
mastering	O
the	O
original	O
QuickTime	O
C	B-Language
API	B-Application
.	O
</s>
<s>
QuickTime	O
7	O
for	O
Mac	O
introduced	O
the	O
QuickTime	O
Kit	O
(	O
aka	O
QTKit	B-Operating_System
)	O
,	O
a	O
developer	O
framework	O
that	O
is	O
intended	O
to	O
replace	O
previous	O
APIs	B-Application
for	O
Cocoa	B-Operating_System
developers	O
.	O
</s>
<s>
This	O
framework	O
is	O
for	O
Mac	O
only	O
,	O
and	O
exists	O
as	O
Objective-C	B-Language
abstractions	O
around	O
a	O
subset	O
of	O
the	O
C	B-Language
interface	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
v10.5	I-Application
extends	O
QTKit	B-Operating_System
to	O
full	O
64-bit	O
support	O
.	O
</s>
<s>
The	O
QTKit	B-Operating_System
allows	O
multiplexing	O
between	O
QuickTime	O
X	O
and	O
QuickTime	O
7	O
behind	O
the	O
scenes	O
so	O
that	O
the	O
user	O
need	O
not	O
worry	O
about	O
which	O
version	O
of	O
QuickTime	O
they	O
need	O
to	O
use	O
.	O
</s>
<s>
QuickTime	O
7.4	O
was	O
found	O
to	O
disable	O
Adobe	O
's	O
video	O
compositing	O
program	O
,	O
After	B-Operating_System
Effects	I-Operating_System
.	O
</s>
<s>
This	O
was	O
due	O
to	O
the	O
DRM	O
built	O
into	O
version	O
7.4	O
since	O
it	O
allowed	O
movie	O
rentals	O
from	O
iTunes	B-Operating_System
.	O
</s>
<s>
Versions	O
4.0	O
through	O
7.3	O
contained	O
a	O
buffer	B-General_Concept
overflow	I-General_Concept
bug	O
which	O
could	O
compromise	O
the	O
security	O
of	O
a	O
PC	O
using	O
either	O
the	O
QuickTime	O
Streaming	O
Media	O
client	O
,	O
or	O
the	O
QuickTime	O
player	O
itself	O
.	O
</s>
<s>
The	O
list	O
includes	O
six	O
types	O
of	O
buffer	B-General_Concept
overflow	I-General_Concept
,	O
data	O
conversion	O
,	O
signed	O
vs.	O
unsigned	O
integer	O
mismatch	O
,	O
and	O
uninitialized	O
memory	O
pointer	O
.	O
</s>
<s>
QuickTime	O
7.6	O
has	O
been	O
found	O
to	O
disable	O
Mac	O
users	O
 '	O
ability	O
to	O
play	O
certain	O
games	O
,	O
such	O
as	O
Civilization	B-Application
IV	I-Application
and	O
The	B-Application
Sims	I-Application
2	I-Application
.	O
</s>
<s>
QuickTime	O
7	O
lacks	O
support	O
for	O
H.264	B-Application
Sample	O
Aspect	O
Ratio	O
.	O
</s>
<s>
QuickTime	O
X	O
does	O
not	O
have	O
this	O
limitation	O
,	O
but	O
many	O
Apple	O
products	O
(	O
such	O
as	O
Apple	B-Device
TV	I-Device
)	O
still	O
use	O
the	O
older	O
QuickTime	O
7	O
engine	O
.	O
</s>
<s>
iTunes	B-Operating_System
previously	O
utilized	O
QuickTime	O
7	O
,	O
but	O
as	O
of	O
October	O
2019	O
,	O
iTunes	B-Operating_System
no	O
longer	O
utilizes	O
the	O
older	O
QuickTime	O
7	O
engine	O
.	O
</s>
<s>
QuickTime	O
7.7.x	O
on	O
Windows	B-Application
fails	O
to	O
encode	O
H.264	B-Application
on	O
multi-core	O
systems	O
with	O
more	O
than	O
approximately	O
20	O
threads	O
,	O
e.g.	O
</s>
<s>
Encoding	B-General_Concept
speed	O
and	O
stability	O
depends	O
on	O
the	O
scaling	O
of	O
the	O
player	O
window	O
.	O
</s>
<s>
Apple	O
responded	O
with	O
a	O
statement	O
that	O
QuickTime	O
7	O
for	O
Windows	B-Application
is	O
no	O
longer	O
supported	O
by	O
Apple	O
.	O
</s>
