| Thursday, May 21st, 2020, 00:12 UTC | ||
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| [03:11:28] | dashs: | Why am I getting 100s of E PreviewQueue: Attempted to generate preview for '10601_20200521000000.ts_0x0_-1s' 702 times; >= max(50) |
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| [13:15:44] | afc: | Hi all. Can I ask a question about MythTV 31 on Ubuntu 18.04 LTS? |
| [13:19:00] | stuarta: | please ask and we will see what we can do |
| [13:19:18] | stuarta: | short version is probably going to be "use the PPA" |
| [13:19:25] | stuarta: | :) |
| [13:19:59] | afc: | Recently upgraded to MythTV 31 from 0.29 and also upgraded from Ubuntu 16.04 to 18.04. Upgraded by adding the mythbuntu "fixes" PPA. Everything was going well until the last but one updates – now the backend seems to crash, often locking the computer completely. |
| [13:21:14] | afc: | Today it crashed whilst people were watching livetv. Error messages that the backend could not be found – a lot of disk activity, with some swapping (1GB used) but about 1.5GB of free RAM so probably ok. |
| [13:22:44] | afc: | We have often noticed it around noon/1pm but there have been times when the machine has been completely "dead", with mythweb & everything shut down (black screen no signal). None of this happened when running Myth 0.29 – really weird – any ideas? |
| [13:23:07] | stuarta: | there is a patch which is only in master which fixes some crashes due to iterator changes |
| [13:23:14] | stuarta: | does the backend actually crash, or just lockup? |
| [13:24:33] | afc: | That's a good question Stuart. Today the frontend was locked and, I assume, the backend was the cause. Mythweb worked to a point but could not access the backend when used on a remote computer. |
| [13:25:09] | stuarta: | having said that, the ubuntu packages run the backend under systemd, so it should restart |
| [13:25:25] | stuarta: | hmmm, 1 sec, does 18.04 even have systemd, or did that land later? |
| [13:25:43] | afc: | It has systemd I think |
| [13:26:29] | stuarta: | you can do `systemctl status mythtv-backend` and that'll soon tell you |
| [13:26:30] | afc: | I was going to say, MythTV used to cycle if it detected a crash – sometimes to the point of driving you nuts but at least it kept going – this is the first time I have found Myth dying like this, not making recordings or doing anything. |
| [13:29:17] | afc: | How would I install the patches? |
| [13:29:38] | stuarta: | i've pinged the relevant dev to ask if it needs backporting |
| [13:29:56] | stuarta: | which i suspect it does |
| [13:30:18] | stuarta: | if so, once it's been backported, it should hit the PPA builds that evening |
| [13:31:07] | afc: | It can't be just me |
| [13:31:16] | afc: | that's being affected |
| [13:31:32] | stuarta: | that also sounds more like a deadlock than a crash |
| [13:31:54] | stuarta: | deadlock systemd won't recover from, as the backend process is still running |
| [13:32:10] | afc: | The OS still works – yes – but Myth just sits there |
| [13:32:34] | afc: | If I could program, I would happily help! |
| [13:32:39] | stuarta: | so if you see it again, capture a core file from the backend process |
| [13:33:19] | stuarta: | https://www.mythtv.org/wiki/Debugging |
| [13:33:28] | afc: | When it happens, it is not easy to leave the frontend – it is just locked showing the "exit yes/no" dialogue box |
| [13:34:07] | stuarta: | alt-tab is your friend |
| [13:34:53] | afc: | I even switched DEs to GNOME-Unity (God, it's awful) but I suspect the problem will still be there in 24 – 48 hours |
| [13:35:28] | stuarta: | that cannot be an improvement :-p |
| [13:36:29] | afc: | Don't! I am expecting one of the kids or Dad (who is elderly) to press keys and just wreck everything! I think I may switch back to Xubuntu DE now I know it is likely to be a patching issue |
| [13:37:18] | afc: | If I could program, I'd help towards MythNetVision but I can't :( |
| [13:37:56] | stuarta: | that needs a complete rewrite |
| [13:38:51] | afc: | Be great when it gets done though – you could add search strings that could be stored – so you can find a particular subject on Youtube for example. |
| [13:39:18] | afc: | Glad I bought it up as it is unlikely to be just me – and thanks for messaging the dev Stuart |
| [13:39:35] | stuarta: | np |
| [13:39:56] | stuarta: | mythnetvision is not high on the priority list unfortunately |
| [13:40:55] | afc: | You can see why as just keeping Myth going is a priority I would imagine, but it'll be great when it's done. |
| [13:43:56] | afc: | Thanks everyone – will keep you posted on how it goes – really great to speak to you all again! |
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| [14:33:04] | dashs: | How to stop PreviewQueue attempts by a frontend? |
| [14:37:47] | stuarta: | not sure there is one |
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| [15:17:37] | dashs: | OK. Guess I'll rebuild the system (it has other probs). |
| [15:18:26] | stuarta: | is it just error messages you are seeing? |
| [15:18:35] | stuarta: | i've got a bunch of them too, and it's working perfectly |
| [15:20:02] | peterbennett: | Anybody know about ":Schedule as Group" , new feature from gigem ? |
| [15:20:11] | peterbennett: | Not so new now |
| [15:20:26] | dashs: | There's an unrelated network problem in recording (hdhomerun pixellation on concurrent streams only). |
| [15:21:28] | peterbennett: | Scheoule as group says that virtual inputs will be automatically added. Does that mean I should set Max Recordings to 1 and it will up it as needed ? |
| [15:37:59] | gigem: | peterbennett: Yes. |
| [15:39:01] | gigem: | Scheduling time is also noticeably improved if you have los of virtual inputs. |
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| [16:42:29] | peterbennett: | gigem: Thanks, If I get around to it I will update the wiki. |
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