MythLogBot@irc.freenode.net :: #mythtv

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Thursday, January 17th, 2019, 00:09 UTC
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[08:32:59] mark____: stuarta: this Qt opengl/es shader compatibility stuff is not as nice as it might be. I suspect it will blow up at some point.
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[08:55:05] stuarta: mark____: what did you find?
[08:57:18] mark____: stuarta: it doesn't add a version string – which was my misunderstanding:) testing on desktop ES – it's not adding the precision workaround. Desktop GL it does add the workaround precision defines.
[08:57:59] mark____: looking at the source code, certain paths are only enabled when it is compiled for gles – which seems odd – given that it still supports gles..
[08:58:58] stuarta: curious
[09:04:08] mark____: and if we add our own defines compilation may fail if qt adds them again. we'll have to see how it goes when we can test on proper gles implementations
[09:04:29] stuarta: i'll have to try it on my rpi
[09:06:07] stuarta: iirc from my test programs, if the version string is there, it gets passed through, which meant code with a version string for opengl blew up on opengles, and vice versa. leaving out the version string and it did the right thing
[09:06:41] stuarta: i notice from your commit you wrapped the high precision program fragment in an ifOpenGLES() so it *should* work
[09:11:53] mark____: stuarta: I'm in the process of removing that piece of code and just adding highp to all of the variable definitions
[09:12:50] mark____: I'm worried that if Qt picks a higher version of GLES (e.g 3) – without a version string it will default to an incompatible version og GLSL
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[09:16:08] stuarta: i could only test on rpi and desktop, but i found Qt would appropiately strip (gles) precision when on a gl platform
[09:16:15] stuarta: https://github.com/stuarta/opengl-qt5/blob/ma . . . /shaders03.h
[09:16:25] stuarta: they are my simple shaders which work on both gl and gles
[09:16:57] stuarta: specifically line 17
[09:17:11] stuarta: if i left the precision out, gl compilation failed on gles
[09:18:25] stuarta: mark____: i would hope the toolkit takes care of the different versions of gles, since it claims to support them
[09:19:26] mark____: stuarta: yup – desktop is fine. Just worried about more modern gles versions e.g. shield etc
[09:20:16] stuarta: wish we had something like the `glxinfo -B` output from a shield
[09:21:03] stuarta: i have a shield, i'd just have to work out how to get it
[09:23:12] mark____: there is an opengl extensions viewer app – but suspect not available for shield
[09:26:25] stuarta: is vaapi really incompatible with gles?
[09:26:46] stuarta: or ENOTIMPLEMENTED ?
[09:31:35] mark____: stuarta: at the moment in our implementation. needs some new code.
[09:31:43] mark____: we only have glx
[09:31:55] stuarta: that's what i thought
[09:33:00] stuarta: it's not exactly a priority tho, i'm not aware of any specific devices (i'm thinking embedded / SOC type boards here) that implement OpenGLES and have VAAPI interface to their hw accel
[09:33:37] stuarta: warpme may be aware of such a device
[09:38:08] mark____: it's needed for desktop though – at some point we should probably default to gles – even on desktop – as it is usually faster. if not available, Qt will just give us desktop gl
[09:39:20] stuarta: also we solved the vaapi on wayland issue, not by using vaGetDisplayWl, but using the ffmpeg API and telling it which dri device to use
[09:39:30] stuarta: (that's what the vaapi2 code does)
[09:39:51] stuarta: which means vaapi decode actually becomes independent of the windowing system
[09:39:56] stuarta: glx / wayland etc
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[09:40:50] stuarta: and that can only be a good thing, if it means we can remove more windowing specific code, such as glx
[09:41:16] mark____: stuarta: but that isn't necessarily going to work the same way if you want to display on screen – rather than copy back – and needs the extra setting (and a user who knows what to set it to!)
[09:41:34] stuarta: tbh that can be made automatic
[09:42:02] stuarta: 99.9% of users will only have a single dri device. i have /dev/dri/renderD128
[09:42:14] stuarta: that could be magically picked up by the code
[09:42:45] stuarta: i've also not yet seen a system where it's not renderD128
[09:43:09] stuarta: even on my rpi that is tru
[09:43:14] stuarta: *true
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[10:11:37] stuarta: hunting for how to get a vaSurface directly into opengl is like hunting for a needle in a haystack
[10:14:09] mark____: stuarta: if in doubt, trawl through the kodi and mpv source:) libva headers aren't helpful
[10:14:15] stuarta: hah
[10:26:02] stuarta: if kodi has done it, it can certainly be done
[10:26:14] stuarta: if they haven't, it can't
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[10:29:49] mark____: it's in both – it's just a nightmare to unravel
[10:30:20] stuarta: i'll bet
[10:30:55] stuarta: peterbennett seems to be having the same issue with nvdec and avoiding the cpu round trip
[10:32:48] stuarta: i'm hoping there will be similarities between the various hw decode implementations that will allow us some code re-use
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[10:40:51] stuarta: peterbennett: i note on my laptop the only place the dynlink_cuda.h headers are present is in the android build android/libs64/qt-everywhere-src-5.10.1/qtwebengine/src/3rdparty/chromium/third_ party/ffmpeg/compat/cuda/dynlink_cuda.h
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[14:40:00] peterbennett: stuarta: I see that the headers are in package nvidia-cuda-dev, so I will see if it works with those, then we can add that as a dependency instead of adding the headers to our repo.
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[15:38:45] gigem: mark____: Regarding opengl extensions app for Android. You can sideload many apps on the Shield and they will still work (for some definitions of work :). You'll probably need a keyboard/mouse to control it, though.
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[15:51:23] stuarta: peterbennett: it's the packaging of that on other platforms i'm not sure of
[15:53:13] peterbennett: stuarta: so what is the best approach? It seems FFmpeg did not want those in its repo because they are "non-free"
[15:54:30] stuarta: interesting
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[15:57:20] stuarta: i'll have to look further for fedora packages then
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[16:13:11] gary_buhrmaster: nv-codec-headers for (at least) Fedora/Centos (EPEL on Centos).
[16:13:59] mark____: gigem: any tips on best sideloading route?
[16:18:41] peterbennett: stuarta: It looks like I will need the nvidia-cuda-tools anyway when I get to the gpu direct video changes.
[16:41:10] mark____: gigem: thanks – all done! that's a lot of OpenGL functionality to get my head around:) and vulkan too...
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[19:27:09] peterbennett: It seems that video playback does not work on V30 raspberry pi
[19:35:12] gigem: mark____: Does that mean you answered your own sideloading question? If not, I usually use "adb install".
[19:36:23] gigem: markspieth, peterbennett: I needed to re-run makelibs.sh from scratch today and now qt fails to build due to issues with renameat2 and statx. https://pastebin.com/vJ5NJ02K. Any ideas?
[19:58:18] peterbennett: gigem: I have not seen that particular problem
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[20:07:11] gigem: peterbennett: I suspected a gcc/g++/libc change and I think that's it. I'm building with qt-5.11.3 instead of 5.1[01].1 and it's proceeding.
[20:08:13] gigem: To be clear, the newer Qt handles the newer system change.
[20:34:20] gary_buhrmaster: gigem: I believe glibc2.28(?) was the trigger. https://codereview.qt-project.org/#/c/236308/ was the fix (I am not going to spend any time figuring out exactly what release(s) happened after the merge, but obviously "later" works).
[21:00:58] stuarta: wish i'd started the rpi build of mark's branch earlier. 2hrs in and still building
[21:05:21] peterbennett: I think something has gone "pear-shaped" with my development raspberry pi.
[21:06:12] peterbennett: The prior version that worked will not platy and things keep seg faulting
[21:07:20] stuarta: smells like wrong opengl libs
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[21:12:37] jheizer: peterbennett: FWIW my previous buildbot rpi went to poo as well
[21:14:03] markspieth: gigem: I have not seen that either. 5.11.3 should work but have had success for a while testing 5.11.1. 5.12 will need a new ndk so after I finish libass changes, I will look into ndk18 which no longer has gcc only clang7
[21:14:50] markspieth: with fixed versions in makelibs and same ndk it should be completely deterministic.
[21:14:50] gigem: gary_buhrmaster: Thanks for looking.
[21:15:38] gigem: markspieth: 5.11.3 built but now mythbuild.sh complains that qtwebkit headers can't be found.
[21:17:07] markspieth: gigem: yes. make of qt fails so the build stops and doesnt proceed to build_qtwebkit59. If you short circuit make install from the build_qt5 stage it will then do the correct thing. not shure why
[21:18:55] markspieth: peterbennett: Ive been using acvsync for a while and may have identified a couple of problems. on skip/start, a/v sync takes about 5–10 secs to catch up on our HD channels. a bit annoying. perhaps sync fast imediately after a skip/start and then use the graceful method.
[21:19:14] markspieth: 2. subtitles are less reliable and some are missed altogether.
[21:19:22] markspieth: this is on linux of course
[21:23:18] stuarta: jheizer: luckily mine seems to be going well still
[21:23:35] stuarta: i'm beginning to think with the rpi it's just better to flash a new card every now and again
[21:30:37] jheizer: Mine's just pxe/nfs to a zfs array now so I don't have to care about a card at all.
[21:31:56] stuarta: only downside is it takes it's time
[21:34:01] stuarta: mine builds to an old laptop drive in an external usb case. works well enough and doesn't kill a card
[21:35:33] jheizer: Yeah, rather slow.
[21:35:49] markspieth: finally got myth configure to find libass in android! woohoo!
[21:36:12] jheizer: Side note, my WoL builders seem to be doing their job lately. Maybe I was too quick to judge the connection time outs.
[21:36:24] jheizer: Or something with my suspend attempts is working, but I don't think so.
[21:37:15] jheizer: Next time you want a new builder let me know. Older 8 core chip and 16gb ram doing nothing 99% of the time.
[21:39:58] stuarta: sure. are we missing anything right now... hmmm...
[21:41:37] markspieth: I cant test until tonight but here is the apk if anyone is keen. should work with subtitles. http://digivation.com.au/debian/mythfrontend- . . . 58-dirty.apk
[21:42:06] markspieth: however maybe missing some .so files which I will only find out by running.
[21:44:04] peterbennett: markspieth: You may be building off old source – we are on v31-Pre now
[21:48:20] stuarta: jheizer: we don't have an ubuntu-19_04
[21:49:14] gigem: markspieth: I'm trying some things for the android/qt build but might need you to be more specific about your "short circuit" comment.
[21:50:11] jheizer: stuarta: Ok, cool. I set one up some night.
[21:50:39] gigem: markspieth: A patch would be better to test your subtitle changes. I have some minor customizations in my personal builds that make using someone elses package undesirable.
[21:52:19] gigem: peterbennett: I've also considered asking for quicker a/v sync after skips. Might don't take 5–10 seconds, though. More like 2–3 but still annoying for sports where I skip *a lot*. For regular shows where I only skip commercials and whatnot, it's not such a problem.
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[21:56:37] stuarta: jheizer: added worker name jheizer-ubuntu-19_04–64bit, grab the password from your ubuntu-lts worker
[22:02:47] jheizer: stuarta: Sounds like a plan
[22:08:51] peterbennett: markspieth: gigem: I will look into that. There is the setting to make sync quicker but that could cause jitter, so perhaps as you say make it quicker catch up at the start or after a jump.
[22:20:33] gigem: peterbennett: Yes, the "could cause jitter" is why I never changed the setting. I thought of trying to figure out much adjustment was needed on average after skipping and then start with that adjust ment. However, simply using agressive syncing for 0.5–1.0 second after skipping and then reverting to normal syncing might be simpler and work well enough.
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[22:25:08] peterbennett: gigem: another option is to use more aggressive syncing if the amount of error is bigger, which it would be at the start
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[22:31:32] gigem: Could work too.
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[22:45:32] jheizer: stuarta: It's up
[23:05:46] gary_buhrmaster: gigem: whenever I encounter *issues*, I want to understand the underlying issues and resolution (and be able to point at the trigger point). Facts matter. It is a character flaw of mine.
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[23:36:57] gigem: I understand and sometimes I do dig deeper myself. In this case, I didn't care to. For the last month, it feels like everything I've tried to do in and outside of MythTV has been plagued by unexpected roadblock after unexpected roadblock. I just wanted to build a fixes/30, android package today. If simply using a newer version of Qt kept me from getting sidetracked yet again, so be it.
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