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

30 Nov 2012

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-------- Оригинално писмо --------
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От: Newsy Paper newspaperman_germany@yahoo.com
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Относно: Re: [vdr] Skystar USB HD + VDR + Astra 23.5E 11817 V / 8psk, fec=5/6
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До: VDR Mailing List vdr@linuxtv.org
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Изпратено на: Вторник, 2012, Ноември 27 22:38:10 EET
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--- N. D.  schrieb am Do, 22.11.2012:
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Von: N. D.
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Betreff: Re: [vdr] Skystar USB HD + VDR + Astra 23.5E 11817 V / 8psk, fec=5/6
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An: "Ales Jurik"
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CC: "VDR Mailing List"
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Datum: Donnerstag, 22. November, 2012 14:31 Uhr
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-------- Оригинално писмо --------
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От: Ales Jurik ajurik@quick.cz
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Относно: Re: [vdr] Skystar USB HD + VDR + Astra
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23.5E 11817 V / 8psk,fec=5/6
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До: VDR Mailing List
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Изпратено на: Сряда, 2012, Юни 13
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18:34:55 EEST
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On 06/13/12 10:45, N. D. wrote:
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Hi,
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Since recently I have been using Skystar USB HD
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with my vdr
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box. However I have some strange issues with
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11817V on Astra 23.5E.
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Femon reports that there is a lock and sound comes
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but the image is
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completely garbled. I am starting to suspect that
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there might be
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something wrong with the driver, because I have no
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trouble with the
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other transpoders. Maybe it is the combination of
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fec=5/6 and 8psk on
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the said transponder that is the reason for this.
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Other transponders
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with fec=3/4 and 8psk are OK. The same setup with
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an HVR-4000 works
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fine.
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Kernel: 3.3.4
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VDR: 1.7.27
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Could someone who owns a Skystar USB HD and has
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access to Astra 23.5E
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share his experience? Is this a driver issue a
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problem with vdr or is my card faulty?
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If someone would be kind enough to test this with
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his/hers hardware, there is a FTA channel on the problematic
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transponder:
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Planeta
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HD;SatelliteBG:11817:VC56M5O35S1:S23.5E:27500:1001=27:1002=@3:0:0:5410:3:3206:0
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Any help would be greatly
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appreciated.
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Hi,
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few months ago on this transponder was nearly 30% of
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null PID packets
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broadcasted, but now it seems to be much better (less
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than 1Mbps). Also
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multiplexing of this transponder was not equal within
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time - there was
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chunks of packets of PlanetHD multiplexed with chunks
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of other SD
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channels mixed packets. Maybe the buffers for USB are
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not big enough to
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memorize such chunks? But I didn't done measuring for
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some months, so
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the situation may be different now.
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You can see bitrates of this transponder at
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http://www.digitalbitrate.com/dtv.php?mux=11817&pid=5410&live=70&...
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The bitrate of this channel is nothing special, with
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maximum about 11
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Mbps, the peak of 20.2Mbps at 22.5. was maybe a joke.
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Regards,
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Ales
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Hi,
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Since 20 Nov transponders 12051V and 12207V on the same
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satellite Astra 3B were switched to fec=5/6 and they also
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became unwatchable. Before the change they were 8psk,
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fec=3/4. Now they are 8psk, fec=5/6.
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have you tried this patch written by Old_Man?
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http://www.vdr-portal.de/board16-video-disk-recorder/board85-hdtv-dvb-s2/p97...
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kind regards
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Newsy
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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&mu...
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.