[vdr] Re: dxr3/vdr problem

[Malcolm Caldwell <malcolm.caldwell@ntu.edu.au>]

On Fri, 2003-02-28 at 22:27, Stefan Schluenss wrote:
> Hi guys,
> 
> Malcom is using DVB-T if i remember correctly and the currently implemented
> DVB-T systems seems to be more in an experimental state than in production
> state ;-)

In fact I am using DVB-S.

To answer another question I have a 2.4m dish receiving c-band signals. 
I live in the tropics and we are in the middle of our rainy season and
we have severe tropical thunder storms.

> The question is who (driver/vdr/dxr3-plugin) has to take care of corrupt
> data ?! In Kai's opinion the data has to be checked and rejected inside the
> driver and such corrcupt data should never reach upper layers (the dxr3-plugin).

This could well be true. (I don't know enough to say).  I think that the
DVB signal has enough error correction etc that the driver should know
when a packet is in error?

> This is at least defined in the ISO/OSI-network model.
> Btw. the DXR3 is by itself very sensitive on corrupt data. It was never
> designed to work under such situations because it has normaly only deal with data
> from a DVD.
> 
> Bis denne
> Stefan.
> 
> > On 28 Feb 2003 17:47:13 +0930
> > Malcolm Caldwell <malcolm.caldwell@ntu.edu.au> wrote:
> > 
> > 
> > Hi Malcolm!
> > Can you record from dvb card?
> > I use the dvb-kernel from 2003-02-16 and it works great.
> > My only problem is the dxr3 card :-(
> > When you mean that the satelite signal is too low, how small 
> > is your satelite-antenna?
> > CU Armin
> > 
> > > Hello,
> > > 
> > > I am still unable to get vdr and the dxr3 plugin working reliably here.
> > > 
> > > I think the problem is due to poor quality signal.  At times the picture
> > > starts to break up etc.  When this is bad vdr usually crashes. 
> > > Sometimes  the dxr3 locks up and I need to do a reboot.  By locks up I
> > > mean that the screen will have random noise frozen on it and sometimes
> > > the sound gets stuck making noise.
> > > 
> > > Often while this is happening I get messages out of vdr:
> > > Feb 28 01:21:17 vdr vdr[1378]: ERROR: unknown picture type '7'
> > > Feb 28 01:21:18 vdr vdr[1378]: ERROR: error in data stream!
> > > Feb 28 01:21:40 vdr vdr[1378]: ERROR: error in data stream!
> > > Feb 28 01:21:41 vdr vdr[1378]: ERROR: unknown picture type '5'
> > > Feb 28 01:21:50 vdr vdr[1378]: ERROR: unknown picture type '5'
> > > Feb 28 01:22:00 vdr vdr[1378]: ERROR: error in data stream!
> > > Feb 28 01:22:14 vdr last message repeated 13 times
> > > Feb 28 01:22:24 vdr vdr[1379]: ERROR: not sync'ed to TS packet on device
> > > 1
> > > Feb 28 01:22:24 vdr vdr[1379]: ERROR: skipped 25 bytes to sync on TS
> > > packet on device 1
> > > Feb 28 01:22:24 vdr vdr[1379]: ERROR: not sync'ed to TS packet on device
> > > 1
> > > Feb 28 01:22:24 vdr vdr[1379]: ERROR: skipped 163 bytes to sync on TS
> > > packet on device 1
> > > Feb 28 01:22:33 vdr vdr[1378]: ERROR: error in data stream!
> > > 
> > > (It is worth noting that my stand-alone receiver has problems during
> > > these times.  I have even known it to lock up and/or have its video
> > > decoder lock up.)
> > > 
> > > Now, we are having very bad weather here at the moment, and that could
> > > explain the problem, but still, the system (vdr/dxr3) should be more
> > > resilient.
> > > 
> > > Just to give you an idea I have been unable to get vdr to run for more
> > > than a few hours.
> > > 
> > > So, it would seem that the dxr3 plugin is not very resilient to error. 
> > > I received an email a while ago from one of the dxr3 plugin authors (Kai
> > > Moeller) saying:
> > > 
> > > > Well, with decoding corrupt pes packets. So actually it is an
> > interface 
> > > > violation because in my opinion the presentation layer should actually
> > not 
> > > > care about such problems.
> > > > Anyway Teemu Rantanen already reported this and we decided to add his 
> > > > workaround to the plugin code.
> > > > We are going to release today or tommorrow.
> > > 
> > > Ki - are you trying to say this is a driver or a vdr issue?
> > > 
> > > Eitherway, I think the dxr3 plugin should be more resilient.  I am
> > > willing to help track down problems etc if its any help (given that my
> > > signal is so poor that I will find problem quickly!)
> > > 
> > > Also, with budget cards - what is the recommended driver?  Perhaps a
> > > different driver would help stop errors getting through to vdr? Has
> > > anyone tried dvb-kernel with vdr?
> > > 
> > > 
> > > 
> > > 
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> > 
> > 
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