[vdr] Re: Lip-Synchronisation

[Gregor Lawatscheck <gpel@mpex.net>]

>I know its not the fault of VDR when this problem occurs, but it would be 
great >to have the possibility to synch the current video.

> Would it be possible to know how does the firmware synchronize audio and 
> video (PTS ?, DTS ?, other ?)
I've been wondering the same thing too and have PTS handling on the list of 
"bugs" I'd like to fix (if I had the expertise and time) / see fixed in vdr 
because the PTS handling could possibly introduce probs with unclean streams.

According to Metzler on the DVB list it's PTS the full featured cards use 
to sync A/V. It would certainly help if vdr would write PTS correctly in 
remux.c (used for transfermode / recording). This way after a stream 
reception error sync remux wouldn't be needed? As far as I can see vdr is 
treating PTS in a different way (or not at all?) than mpegtools' ts2ps 
does. ts2ps applies timestamps to the header according to a coded-in 
transformation table if I read the code correctly -- vdr doesn't do this.

Now possibly this is because it's not needed for "pseudo" TS coming from a 
full card -- but then what about real TS with recording from a budget card 
or using transfer mode? I'm not quire sure what the reasoning behind it 
is... I'm sure Klaus can comment much more competently than myself...

- Gregor 


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