[linux-dvb] relating PTS to 'real' time

Robert Schlabbach robert_s at gmx.net
Tue Aug 23 00:28:45 CEST 2005

From: <public at whitelabel.org>
> When grabbing channels from a dvb-t transport stream and demuxing, the
> presentation timestamps seem to be offset from physical time. E.g. for
> BBC One on freeview in the UK, it seems to be about 4.5 hours.

MPEG-2 PTS/DTS do _not_ refer to any real time clock, but rather to the
clock provided through the PCR.

> How does this work? I've googled all over the place, but can't find an
> explanation.

You need to read ISO/IEC 13818-1 or ITU-T H.222.0. The latter can be
downloaded for free if you register for three free standards downloads (per
year) at www.itu.org.

Robert Schlabbach
e-mail: robert_s at gmx.net
Berlin, Germany

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