<s>
The	O
presentation	B-Protocol
timestamp	I-Protocol
(	O
PTS	O
)	O
is	O
a	O
timestamp	O
metadata	O
field	B-Application
in	O
an	O
MPEG	O
transport	O
stream	O
or	O
MPEG	O
program	O
stream	O
that	O
is	O
used	O
to	O
achieve	O
synchronization	O
of	O
programs	O
 '	O
separate	O
elementary	O
streams	O
(	O
for	O
example	O
Video	O
,	O
Audio	O
,	O
Subtitles	O
)	O
when	O
presented	O
to	O
the	O
viewer	O
.	O
</s>
<s>
Presentation	B-Protocol
time	I-Protocol
stamps	I-Protocol
have	O
a	O
resolution	O
of	O
90kHz	O
,	O
suitable	O
for	O
the	O
presentation	O
synchronization	O
task	O
.	O
</s>
