Dvbv5-scan of Astra 28.2
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2024-01-16, 07:49 PM
The predefined Astra 28.2E are woefully out of date. Unfortunately nobody is updating them that knows what they are doing. I created a dummy list and used that to carry out that last scan. As I said earlier I’ve very little faith in dvbv5-scan either. It’s poorly documented too. Maybe Sub could look at some of the alternatives.
2024-01-16, 08:21 PM
(This post was last modified: 2024-01-16, 08:23 PM by mvallevand.)
libdvbv5 seems to be working ok in general so I don't share your opinion. Sub found a problem with ATSC scanning and I was able to find the bug and submitted the fix which is now in the mainline. If there is a specific problem rather than look for alternatives I like to find a solution.
Linux dvb in general is not in great shape, especially the scan files. This is why I was shocked when LibreELEC moved from the TVHeadend git for the scan tables to incredibly out of date source https://git.linuxtv.org/dtv-scan-tables.git/ I think expecting users to submit changes via a Linux mailing list is ridiculous. For NextPVR on LibreELEC/CoreELEC I do provide a mechanism for curated lists of scan files. Martin
2024-01-16, 09:20 PM
The one remaining person who had limited admin privileges on the TVHeadend forum decided to hand it all over to the guys in LibreELEC instead of consulting with the members who have among their ranks some very capable developers. Major mistake and one TVH users will live to regret. I reckon that decision will finally kill off TVHeadend as a credible option for PVR.
There are a number of alternative scanning tools available out there which I reckon are superior to dvbv5 scan. The one I linked to earlier w_scan_cpp is one I’m going to build myself as there are no precompiled packages currently available for Ubuntu 22.04. Regarding predefined mux lists it’s easier to create a dummy and scan will automatically pick up the remaining active muxes anyway. Crazycat69’s repo seems to be the most up to date but even that one looks patchy. Unfortunately with the rise in IPTV popularity most of the developers efforts are targeted towards that area so, in my case DVBS has taken a back seat in popularity. Still a few knowledgeable guys out there keeping their hand in though.
2024-01-16, 09:35 PM
The PR I was talking about was in LE before the handoff to chewitt https://github.com/LibreELEC/LibreELEC.tv/pull/8311 chewitt thinks there is no problem using Linux mailing list for updates when we discussed in on Slack. Anyway as I said for NextPVR on LE mine is a mix of scan files from CrazyCat, TVheadend and the source and I can add new ones if need.
I am not sure how you can create an empty dummy file without knowing what spectrum characteristics you are dealing with. I think sub should stick with libdvbv5 for as long as it works. Nothing points to a problem right now. Martin
2024-01-16, 11:49 PM
I don't have any major problem with libdvbv5 other than the supplied tuning files are terribly out of date.
I know first hand that these types of files can be very difficult to maintain without users in each of those countries/regions supplying updated files whenever local broadcasts change, but as the main DVB api for Linux, these tuning files are woefully bad. Unfortunately it's not really possible to use the NextPVR tuning files (from Windows and SAT>IP) as a basis for tuning on Linux (they require some additional info we don't have). (2024-01-16, 11:49 PM)sub Wrote: I don't have any major problem with libdvbv5 other than the supplied tuning files are terribly out of date. What I’ve given you here are scans done on an Hauppauge HVR4000 pci card for Astra 28.2 In Ubuntu 22.04 LTS. I had to set this this system up specifically to do this. Can you confirm that you’ve got the required information from these scans now to proceed with your work on EPG in Linux.
2024-01-17, 01:51 AM
2024-01-17, 02:03 AM
(2024-01-17, 01:51 AM)sub Wrote:(2024-01-17, 01:04 AM)satforall Wrote: Can you confirm that you’ve got the required information from these scans now to proceed with your work on EPG in Linux.Yes I think so. Martin extracted the bits in question, and I've had a quick look, and I'm pretty sure it's exactly what we needed. That’s good news. I swapped the Digibit Twin Sat/IP tuner for the Hauppauge pci card thinking that a scan might yield richer results. I played around with mux tables and dvbv5/scan options too. The creators of dvbv5-scan could have documented the options available a little clearer. The Manpages are not exactly a mine of information.
2024-01-17, 04:02 AM
Thanks for doing that. When you mentioned via PM that you had a Happauge tuner I thought it was hooked up . Like all command line utilities dvbv5-scan and zap can be cryptic and unfortunately I don't have a dvb-s modulator to help figure it out. This seems pretty complete https://www.linuxtv.org/wiki/index.php/Dvbv5-scan but I can't say if it is EXTENDED or UNIVERSAL that you need or not.
Martin
2024-01-17, 03:06 PM
(2024-01-17, 04:02 AM)mvallevand Wrote: Thanks for doing that. When you mentioned via PM that you had a Happauge tuner I thought it was hooked up . Like all command line utilities dvbv5-scan and zap can be cryptic and unfortunately I don't have a dvb-s modulator to help figure it out. This seems pretty complete https://www.linuxtv.org/wiki/index.php/Dvbv5-scan but I can't say if it is EXTENDED or UNIVERSAL that you need or not. Yes I saw that which ties in with the Manpages but in order to scan a satellite the minimum command you would require as follows (in my case it was Astra 28.2E) dvbv5-scan -l extended /usr/share/dvb/dvb-s/Astra-28.2E I noticed in a previous post on the forum that the user was struggling with the command line options for scanning a satellite and unfortunately most of the real time examples you’ll see on the net appear only to cater for DVBT and DVBC. I didn’t have an issue using dvbv5-scan to scan a satellite but I imagine others have. I’ll fill out a Wiki on one of the satellite forums or post a primer here at some stage outlining the command line options with real time examples for others to use. I have a motorised setup with coverage from 58W to 58E with both DVBS pci tuners and DVBS Sat/IP tuners so I can easily swap between both if the need arises. Hopefully Sub now has the info he requires to implement an integrated EPG solution in NPVR. |
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