[vdr] Skystar USB HD + VDR + Astra 23.5E 11817 V / 8psk, fec=5/6

N. D. named2 at abv.bg
Fri Nov 30 11:48:55 CET 2012










 >-------- Оригинално писмо --------

 >От: Newsy Paper newspaperman_germany at yahoo.com

 >Относно: Re: [vdr] Skystar USB HD + VDR + Astra 23.5E 11817 V / 8psk, fec=5/6

 >До: VDR Mailing List <vdr at linuxtv.org>

 >Изпратено на: Вторник, 2012, Ноември 27 22:38:10 EET

> --- N. D.  schrieb am Do, 22.11.2012:
 
> 
 
> > Von: N. D. 
 
> > Betreff: Re: [vdr] Skystar USB HD + VDR + Astra 23.5E 11817 V / 8psk, fec=5/6
 
> > An: "Ales Jurik" 
 
> > CC: "VDR Mailing List" 
 
> > Datum: Donnerstag, 22. November, 2012 14:31 Uhr
 
> > 
 
> > 
 
> >  >-------- Оригинално писмо --------
 
> > 
 
> >  >От: Ales Jurik ajurik at quick.cz
 
> > 
 
> >  >Относно: Re: [vdr] Skystar USB HD + VDR + Astra
 
> > 23.5E 11817 V / 8psk,fec=5/6
 
> > 
 
> >  >До: VDR Mailing List 
 
> > 
 
> >  >Изпратено на: Сряда, 2012, Юни 13
 
> > 18:34:55 EEST
 
> > 
 
> > 
 
> > 
 
> >  
 
> > > On 06/13/12 10:45, N. D. wrote:
 
> >  
 
> > > > 
 
> >  
 
> > > >        
 
> >            
 
> >            
 
> >     Hi,
 
> >  
 
> > > > Since recently I have been using Skystar USB HD
 
> > with my vdr 
 
> >  
 
> > > > box. However I have some strange issues with
 
> > 11817V on Astra 23.5E. 
 
> >  
 
> > > > Femon reports that there is a lock and sound comes
 
> > but the image is 
 
> >  
 
> > > > completely garbled. I am starting to suspect that
 
> > there might be 
 
> >  
 
> > > > something wrong with the driver, because I have no
 
> > trouble with the 
 
> >  
 
> > > > other transpoders. Maybe it is the combination of
 
> > fec=5/6 and 8psk on 
 
> >  
 
> > > > the said transponder that is the reason for this.
 
> > Other transponders 
 
> >  
 
> > > > with fec=3/4 and 8psk are OK. The same setup with
 
> > an HVR-4000 works 
 
> >  
 
> > > > fine.
 
> >  
 
> > > > 
 
> >  
 
> > > > Kernel: 3.3.4
 
> >  
 
> > > > 
 
> >  
 
> > > > VDR: 1.7.27
 
> >  
 
> > > > 
 
> >  
 
> > > > Could someone who owns a Skystar USB HD and has
 
> > access to Astra 23.5E 
 
> >  
 
> > > > share his experience? Is this a driver issue a
 
> > problem with vdr or is my card faulty?
 
> >  
 
> > > > 
 
> >  
 
> > > > If someone would be kind enough to test this with
 
> > his/hers hardware, there is a FTA channel on the problematic
 
> > transponder:
 
> >  
 
> > > > 
 
> >  
 
> > > > 
 
> >  
 
> > > > 
 
> >  
 
> > > > Planeta
 
> > HD;SatelliteBG:11817:VC56M5O35S1:S23.5E:27500:1001=27:1002=@3:0:0:5410:3:3206:0
 
> >  
 
> > > > 
 
> >  
 
> > > > 
 
> >  
 
> > > > 
 
> >  
 
> > > > Any help would be greatly
 
> > appreciated.       
 
> >            
 
> >             
 
> >  
 
> > > > 
 
> >  
 
> > > 
 
> >  
 
> > > Hi,
 
> >  
 
> > > 
 
> >  
 
> > > few months ago on this transponder was nearly 30% of
 
> > null PID packets
 
> >  
 
> > > broadcasted, but now it seems to be much better (less
 
> > than 1Mbps). Also
 
> >  
 
> > > multiplexing of this transponder was not equal within
 
> > time - there was
 
> >  
 
> > > chunks of packets of PlanetHD multiplexed with chunks
 
> > of other SD
 
> >  
 
> > > channels mixed packets. Maybe the buffers for USB are
 
> > not big enough to
 
> >  
 
> > > memorize such chunks? But I didn't done measuring for
 
> > some months, so
 
> >  
 
> > > the situation may be different now.
 
> >  
 
> > > 
 
> >  
 
> > > You can see bitrates of this transponder at
 
> >  
 
> > > http://www.digitalbitrate.com/dtv.php?mux=11817&pid=5410&live=70&lang=en
 
> > .
 
> >  
 
> > > 
 
> >  
 
> > > The bitrate of this channel is nothing special, with
 
> > maximum about 11
 
> >  
 
> > > Mbps, the peak of 20.2Mbps at 22.5. was maybe a joke.
 
> >  
 
> > > 
 
> >  
 
> > > Regards,
 
> >  
 
> > > 
 
> >  
 
> > > Ales
 
> > 
 
> > Hi,
 
> > 
 
> > Since 20 Nov transponders 12051V and 12207V on the same
 
> > satellite Astra 3B were switched to fec=5/6 and they also
 
> > became unwatchable. Before the change they were 8psk,
 
> > fec=3/4. Now they are 8psk, fec=5/6. 
 
> > 
 
> > _______________________________________________
 
> have you tried this patch written by Old_Man?
 
> 
 
> http://www.vdr-portal.de/board16-video-disk-recorder/board85-hdtv-dvb-s2/p977938-stb0899-fec-3-4-tester-gesucht/#post977938
 
> 
 
> kind regards
 
> 
 
> Newsy
 
> 
 
 > _______________________________________________
 
I am running kernel 3.6.2 on that particular machine and as far as I can tell that patch is already included. I also tried reverting it but it didn't help. 
For me the telling difference can be seen here:
http://www.digitalbitrate.com/dtv.php?liste=1&live=70&lang=en&mux=12207
Before the change to fec=5/6 the total bitrate of 12207V and 12051V was below 60Mbps. Now it is over 65Mbps. According to the spec for Technotrend S2-3200 (http://www.tt-downloads.de/update/engl/techspec_tt-budget_s2-3200_en.pdf) 60Mbps is the limit for DVB-S. For DVB-S2 it is stated that the card supports bitrates of up to 90Mbps. So my next guess is that the linux driver implementation somehow precludes the support of bitrates above 90Mbps for DVB-S2, which are technically possible nonetheless. After all I was able to accidentally get proper lock on these transponders a couple of times but it is very hard to reproduce. 



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