[vdr] Re: PATCHES: vdr-1.2.6 (getSTC and mp2)

[Sven Goethel <sgoethel@jausoft.com>]

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On Friday 07 November 2003 16:37, Oliver Endriss wrote:
> On Friday 07 November 2003 15:56, Dr. Werner Fink wrote:
> > On Fri, Nov 07, 2003 at 03:46:31PM +0100, Oliver Endriss wrote:
> > > On Friday 07 November 2003 15:08, Sven Goethel wrote:
> > > > hmm .. so ain't there a way to get the seen PTS (video/audio)
> > > > of the played (replay/transfer/live) stream ?
> > >
> > > Imho the *PTS* (presentation timestamp) is not directly available,
> > > but the *STC* (System Time Clock) can be used instead.
> > >
> > > According to my tests, the STC is valid during replay/transfer/live
> > > mode. In trick mode (pause, slow motion, fast forward/rewind) it is
> > > meaningless anyway.
> > >
> > > > afai understand STC is the seen PTS as long as you just play ..
> > >
> > > Apparently the STC is set to the value of the PTS in the recorded
> > > material.
> > >
> > > It might be interesting for you to read section '11. Synchronization'
> > > of the av7110 datasheet. There is an explanation how the av7110
> > > performs A/V sync. Maybe you can use some ideas.
> >
> > The question is: how to get the offset to STC for audio as described
> > in paragraph 11.6?  Especially in live mode.  AFAIS there is no method
> > to get it from the firmware/driver.  Nevertheless this would help
> > a lot to get AC3 streams in sync with the live picture regardless of
> > the used channel/transponder.
>
> If I understand 11.5/11.6 correctly, there are basically 3 STCs:
> STCsys, STCvid and STCaud, where
> o STC = PCR
> o STCvid = STCsys+vidoffset
> o STCaud = STCsys+audoffset
> o vidoffset = audoffset (0 unless a buffer over/underrun occurred)
>
> If the DMX_GET_STC ioctl delivers STCvid, there is no problem.
> But I don't know which STC value is returned.
>

so .. _does_ anybody know this ?

btw - @klaus: - this was the reason, i tried to used
different file handles .. (fd_vid for STCvid .. ;-)
but .. we know, this did not worked ..

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