> > > I own a Skystar USB HD which I use with vdr. Ever since I bought the card I have been having 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. The same setup (Kernel: 3.3.8, VDR: 1.7.27) works fine with an HVR-4000. So I started to suspect that there might be something wrong with the driver. Trying to find out some more information I came across this forum: > > > > > > > http://rickcaylor.websitetoolbox.com/post/stv0900_core.c-patch-5481028 > > > > > > > I tried the patch which is supposed to (among other things) make the tuner lock on high bitrate transponders (>60Mbps). But it did not help. > > > > > > > So using the stock driver I gave dvbsnoop a whirl to see if there was something amiss. > > > > > > > > > > > > > > Astra 3B 11817.00 V DVB-S2 8PSK 27500 5/6 66.6 Mbps > > > > > > > > > > > > > > packets read: 122/(343292) d_time: 0.001 s = 183488.000 kbit/s (Avrg: 66142.860 kbit/s) [bad: 2] > > > > > > > packets read: 42/(343334) d_time: 0.001 s = 63168.000 kbit/s (Avrg: 66150.953 kbit/s) [bad: 0] > > > > > > > packets read: 38/(343372) d_time: 0.001 s = 57152.000 kbit/s (Avrg: 66158.274 kbit/s) [bad: 2] > > > > > > > packets read: 34/(343406) d_time: 0.001 s = 51136.000 kbit/s (Avrg: 66164.825 kbit/s) [bad: 1] > > > > > > > packets read: 35/(343441) d_time: 0.001 s = 52640.000 kbit/s (Avrg: 66171.569 kbit/s) [bad: 2] > > > > > > > packets read: 31/(343472) d_time: 0.001 s = 46624.000 kbit/s (Avrg: 66177.541 kbit/s) [bad: 4] > > > > > > > packets read: 16/(343488) d_time: 0.001 s = 24064.000 kbit/s (Avrg: 66180.624 kbit/s) [bad: 0] > > > > > > > packets read: 29/(343517) d_time: 0.008 s = 5452.000 kbit/s (Avrg: 66118.450 kbit/s) [bad: 1] > > > > > > > packets read: 116/(343633) d_time: 0.001 s = 174464.000 kbit/s (Avrg: 66140.777 kbit/s) [bad: 1] > > > > > > > packets read: 38/(343671) d_time: 0.001 s = 57152.000 kbit/s (Avrg: 66148.091 kbit/s) [bad: 1] > > > > > > > packets read: 34/(343705) d_time: 0.001 s = 51136.000 kbit/s (Avrg: 66154.635 kbit/s) [bad: 1] > > > > > > > packets read: 30/(343735) d_time: 0.001 s = 45120.000 kbit/s (Avrg: 66160.410 kbit/s) [bad: 0] > > > > > > > packets read: 37/(343772) d_time: 0.001 s = 55648.000 kbit/s (Avrg: 66167.531 kbit/s) [bad: 2] > > > > > > > packets read: 38/(343810) d_time: 0.001 s = 57152.000 kbit/s (Avrg: 66174.845 kbit/s) [bad: 1] > > > > > > > packets read: 30/(343840) d_time: 0.001 s = 45120.000 kbit/s (Avrg: 66180.619 kbit/s) [bad: 0] > > > > > > > > > > > > > > Then I experimented with a lot of other transponders and found another one with the same behavior. > > > > > > > > > > > > > > HotBird 13C 11411.00 H DVB-S2 8PSK 27500 5/6 68.2 Mbps > > > > > > > > > > > > > > packets read: 40/(259860) d_time: 0.001 s = 60160.000 kbit/s (Avrg: 65498.482 kbit/s) [bad: 0] > > > > > > > packets read: 39/(259899) d_time: 0.001 s = 58656.000 kbit/s (Avrg: 65508.312 kbit/s) [bad: 0] > > > > > > > packets read: 34/(259933) d_time: 0.001 s = 51136.000 kbit/s (Avrg: 65516.882 kbit/s) [bad: 1] > > > > > > > packets read: 34/(259967) d_time: 0.001 s = 51136.000 kbit/s (Avrg: 65525.451 kbit/s) [bad: 0] > > > > > > > packets read: 36/(260003) d_time: 0.001 s = 54144.000 kbit/s (Avrg: 65534.525 kbit/s) [bad: 2] > > > > > > > packets read: 11/(260014) d_time: 0.001 s = 16544.000 kbit/s (Avrg: 65537.298 kbit/s) [bad: 1] > > > > > > > packets read: 349/(260363) d_time: 0.008 s = 65612.000 kbit/s (Avrg: 65537.398 kbit/s) [bad: 7] > > > > > > > packets read: 25/(260388) d_time: 0.008 s = 4700.000 kbit/s (Avrg: 65456.051 kbit/s) [bad: 0] > > > > > > > packets read: 129/(260517) d_time: 0.001 s = 194016.000 kbit/s (Avrg: 65488.479 kbit/s) [bad: 2] > > > > > > > packets read: 35/(260552) d_time: 0.001 s = 52640.000 kbit/s (Avrg: 65497.277 kbit/s) [bad: 0] > > > > > > > packets read: 37/(260589) d_time: 0.001 s = 55648.000 kbit/s (Avrg: 65506.578 kbit/s) [bad: 2] > > > > > > > packets read: 34/(260623) d_time: 0.001 s = 51136.000 kbit/s (Avrg: 65515.125 kbit/s) [bad: 2] > > > > > > > packets read: 36/(260659) d_time: 0.001 s = 54144.000 kbit/s (Avrg: 65524.174 kbit/s) [bad: 3] > > > > > > > packets read: 34/(260693) d_time: 0.001 s = 51136.000 kbit/s (Avrg: 65532.721 kbit/s) [bad: 0] > > > > > > > packets read: 21/(260714) d_time: 0.001 s = 31584.000 kbit/s (Avrg: 65538.000 kbit/s) [bad: 0] > > > > > > > > > > > > > > Both of these are 8psk 5/6 and have an average bitrate of over 65Mbps. The high bitrate per se could not explain what is wrong because there are a number of ~65Mbps transponders on Hotbird which are OK. > > > > > > > > > > > > > > For example: > > > > > > > > > > > > > > HotBird 13B 11785.00 H DVB-S2 8PSK 29900 3/4 65.1 Mbps > > > > > > > > > > > > > > packets read: 33/(434934) d_time: 0.001 s = 49632.000 kbit/s (Avrg: 65101.586 kbit/s) [bad: 0] > > > > > > > packets read: 38/(434972) d_time: 0.001 s = 57152.000 kbit/s (Avrg: 65107.274 kbit/s) [bad: 0] > > > > > > > packets read: 34/(435006) d_time: 0.001 s = 51136.000 kbit/s (Avrg: 65112.363 kbit/s) [bad: 0] > > > > > > > packets read: 36/(435042) d_time: 0.001 s = 54144.000 kbit/s (Avrg: 65117.752 kbit/s) [bad: 0] > > > > > > > packets read: 17/(435059) d_time: 0.001 s = 25568.000 kbit/s (Avrg: 65120.296 kbit/s) [bad: 0] > > > > > > > packets read: 32/(435091) d_time: 0.007 s = 6875.429 kbit/s (Avrg: 65079.748 kbit/s) [bad: 0] > > > > > > > packets read: 122/(435213) d_time: 0.001 s = 183488.000 kbit/s (Avrg: 65091.523 kbit/s) [bad: 0] > > > > > > > packets read: 38/(435251) d_time: 0.001 s = 57152.000 kbit/s (Avrg: 65097.206 kbit/s) [bad: 0] > > > > > > > packets read: 36/(435287) d_time: 0.001 s = 54144.000 kbit/s (Avrg: 65102.590 kbit/s) [bad: 0] > > > > > > > packets read: 36/(435323) d_time: 0.001 s = 54144.000 kbit/s (Avrg: 65107.975 kbit/s) [bad: 0] > > > > > > > packets read: 35/(435358) d_time: 0.001 s = 52640.000 kbit/s (Avrg: 65113.209 kbit/s) [bad: 0] > > > > > > > packets read: 36/(435394) d_time: 0.001 s = 54144.000 kbit/s (Avrg: 65118.593 kbit/s) [bad: 0] > > > > > > > packets read: 8/(435402) d_time: 0.001 s = 12032.000 kbit/s (Avrg: 65119.790 kbit/s) [bad: 0] > > > > > > > packets read: 348/(435750) d_time: 0.008 s = 65424.000 kbit/s (Avrg: 65120.032 kbit/s) [bad: 0] > > > > > > > packets read: 344/(436094) d_time: 0.008 s = 64672.000 kbit/s (Avrg: 65119.676 kbit/s) [bad: 0] > > > > > > > > > > > > > > The only difference is in the code rate: 3/4 v 5/6. I also tried some DVB-S qpsk 5/6 transponders but none of them had such a high bitrate. So it seems to me that either my hardware is faulty or the combination of 8psk, fec 5/6 (and possibly the high bitrate) is triggering some bug in the driver. > > > > > > > I hope someone more knowledgeable could chime in and shed more light. > > > > > > > > > > > > > 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. > > > > > > > > I dug out my old Technotrend S2-3200 and gave it a go. Same transponders, same problem. Other transponders, which are OK with Skystar USB HD, are also OK with s2-3200. I wonder if these cards share some common code, or maybe some common driver bug. I will repeat that HVR-4000 has no problem with the same setup. Also I have noticed that under bad weather the picture seems to be somewhat less garbled. It is a cloudy day here and by some freak chance I was able to get perfect picture on a single occasion with the technotrend card. Maybe, and this just an uneducated :) guess, signal strength and quality are too high, off the chart, for s2-3220 and ss usb hd to gain proper lock. HVR-4000 registers ~100% signal and snr. Unfortunately my antenna is on the roof of the building and I can't reduce signal by moving it. > -- This is an update. I tried reducing the signal by extending he cable and inserting some f-couplers but that failed miserably. However I checked the bitrates on the newly changed transponders. There seems to be a marked difference which 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. Unfortunately I was unable to find similar info for Technisat USB HD. 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. I was able to accidentally get proper lock on these transponders a couple of times but it is very hard to reproduce. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
