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

Stefan Magdalinski public at whitelabel.org
Tue Aug 23 14:28:28 CEST 2005


Robert Schlabbach wrote:
> 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.
> 

That's what I figured. If I were to rephrase my question, what is the
process for matching timestamp data from the streams to real time?

> 
>>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.

I have read it, but not found it hugely edifiying. I'm not being lazy,
just thick.

stef

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