MythLogBot@irc.freenode.net :: #mythtv

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Monday, November 2nd, 2020, 00:12 UTC
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[09:31:59] markk__: warpme_: https://github.com/MythTV/mythtv/issues/278
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[10:14:09] warpme_: markk__: fantastic!. just some comments: 1\"seeking is completely broken" – this is known issue of ffmpeg-kernel cooperation. It is one from reasons why i'm so happy we have initial working v4l2_request as this allows me to work with kernel guys to sort this issue :-) 2\"consistent kernel pre-emption when exiting playback": this is known regression in 5.9 kernel. I & Daniel Vetter already solved this. Fix is included in
[10:14:09] warpme_: drm-next, 5.10-rc2 and will be soon included in updated 5.9 kernel (which armbian is using) -> so armbian update should fix this issue :-). 3\"not clear whether direct rendering should be enabled or not": I think definitely it should. But what intriguing me more is: I suspect current Qt already does this.... Look: on amlogic sm1 i have 30% cpu load for hdtv sw.decode. I don't believe such 30% cpu load can be achieved
[10:14:09] warpme_: without already zero-copy for uncompressed video frames realised by Qt. My logic: ffmpeg sw.decode alone needs cpu. I think 30% is pretty reasonable for ffmpeg doing simd assisted sw. decode (for hd with not so high bitrate). As total cpu is also around 30% -> it looks like uncompressed 1080 frames are provided to gl driver with practically zero cpu cost. I don't believe uncompressed 1080 frames can be memcopied from
[10:14:09] warpme_: ffmpeg output to gl driver with almost zero cpu cost without zero-copy mode. memcpy of 1080 uncompressed frame from one mem.loc to another mem.loc. is costly i think. As i don't see this cost in total cpu load – ffmpeg->gl imho must be somehow zero-copy assisted. Anyway: I'll compile new code and give you feedback. Also – we can test online updates of mm2 from Internet: you should be able to full update of yours tx6 to
[10:14:09] warpme_: new code via Internet. As mm2 already has 5.10 kernel – some issues (i.e. kernel pre-emption when exiting playback) should gone on mm2. We can verify this. I'll give you update soon....
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[11:43:28] markk_: warpme_: the reference to direct rendering is more of an internal, mythtv buffer management thing. the code is defnititely direct rendering the drm frames already.
[11:43:33] markk_: warpme_: what is mm2?
[11:47:22] markk_: warpme_: sorry – mm2 – with you now:)
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[13:00:10] hampton: markk_: I loaded master onto one of my frontends last night, and I was wrong about my osd issue being fixed. Works on my laptop (and may have before), still doesn't work on the Intel NUC frontend. What information do you need me to include in a bug report?
[13:01:01] hampton: When I pause video, the OSD flashes for an instant and then vanishes. Reappears when I start playing video, then fades out.
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[14:26:27] warpme_: hampton: just fyi: i gave run for current master on 2 intel machines: nuc i5 and (i5 hd4000) and bt4 (z8500 hd600) and.....all works perfectly. what gl diver are you using?
[14:52:34] hampton: I have an INtel NUC6CAYH running Fedora using mesa-libGL-20.1.10–1.fc32.x86_64. My video decoder is using vaapi acceleration, and the video renderer is set to "opengl hardware". Does that answer your question?
[14:54:56] hampton: My video profile is labeled "2019 render test" so it must have been something from a while back testings Mark's early changes. I can switch it to "VAAPI Normal" if you think that would help.
[14:56:15] stuarta: can't hurt to try
[14:57:55] stuarta: hampton: your debian buster build worker appears to be offline
[15:22:41] warpme_: hampton: indeed – i remember in past subtle issues in playback which finally becomes result of "corrupted" playback profile. definitely it is worth to go with fresh created profile. I see you are using latest fixes in 20.1 mesa branch. it should work ok. and what ver Qt is? Also – does it play ok with sw, decode?
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[15:39:35] markk_: hampton: I very much doubt the problem is opengl/video related. If I were to put money on it, I would say it's a keybinding issue – with a theme issue the second favourite. I would first try a different theme and then try binding a spare key to the play action. If that doesn't help, i'd put some logging in TV play and/or try a few break points to interrogate the state when the action is triggered.
[15:40:02] markk_: all in all I suspect something is clearing the OSD as soon as it is shown – as I'm guessing everything else is working as expected.
[15:41:35] markk_: hampton: or simply adjust the define in line 84 of tv_play.cpp
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[16:02:34] hampton: stuarta: Thanks. I appear to be somewhere between restarting the build worker with a crontab entry and restarting it with systemd.
[16:04:55] stuarta: hah
[16:06:29] hampton: I was having problems with the crontab style on recent debian/ubuntu release so started testing systemd, and apparently never finished.
[16:07:58] stuarta: easy enough to do
[16:09:21] hampton: markk_: Not the theme. Switched to MythCenter-wide and the "VAAPI Normal" playback profile and still see the problem.
[16:27:58] hampton: markk_: No key bindings. I'm using the network interface for control. Sending "play speed normal" for my remote's play key, and "play speed pauer" (sic) for the pause key. I see I need to fix the message sent for that key. Do you think that would cause the problem?
[16:32:39] markk_: hampton: it wouldn't surprise me if that is the problem. quick scan suggests pause isn't a recognised speed (and neither is pauer !)
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[18:46:27] hampton: In programs/mythfrontend/networkcontrol.cpp the help text has 'play speed pause'. Line 860 of that file is where it parses the "pause" keyword. Not quite sure why "pauer" works, but it apparently does as the playback pauses. What I should be exercising with my play and pause keys are the if clauses at tv_play.cpp:4347 and tv_play.cpp:4354. (Search for 'tokens[2] == "0x"' if that's not what's on lne 4347.)
[18:46:42] hampton: I'll try testing this under gdb after lunch...
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[21:14:54] hampton: markk_: Running mythfrontend on my laptop, osd works correctly if I use the space bar for pause/play. Osd doesn't work properly if I connect via the network control port and use "play speed pause"/"play speed normal".
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