OpenGL render bugs with JACK #65584
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Reference: blender/blender#65584
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Operating system: Kubuntu 18.10, 4.18.0-20-generic #21-Ubuntu SMP Mon May 6 18:45:52 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Graphics card: NVIDIA Corporation GP106 [GeForce GTX 1060 6GB] (rev a1)
Broken: 2.80,
8fa65ed31b
June 05, 23:41:04Bug 1: observe that it delays for a while before beginning (maybe not a bug, but seemed pretty long)
Bug 2: an error pops up saying "skipping existing frame /tmp/0105"; this error occasionally appears again for subsequent frames, but usually not
Bug 3: rendering is very slow (1-2 fps, and my /tmp is a ram disk; this is true regardless of JACK/no-JACK, AV Sync or No Sync, etc)
Bug 4: (maybe just a UI paper cut?) without changing the start/end of the animation range, there appears to be no way to start an OpenGL render from a given frame unless "AV Sync" and JACK are both used?
Bug 5: (not sure if bug?) enabling/disabling AV Sync, or switching to/from JACK, often causes play cursor to change frames
Added subscriber: @clepsydrae
Added subscribers: @neXyon, @mano-wii
I don't see that
JACK
option on my end.@neXyon,
Audio
seems to be your area.Added subscriber: @Sergey
After spending some time playing around with this I can make the following observations:
May I also ask, what is your reason to use JACK?
In summary: I can't reproduce 1, 2 and 4. Bug 5 is not a bug and bug 3, if it is one is not related to audio, so I'm putting this report up for grabs. Maybe some of the stuff is related to recent changes in the dependency graph and its working with the audio system, so @Sergey might be the person to ask here.
Not sure why any of the observed issues will be related on the audio + dependency graph changes.
@clepsydrae, does any of the issues you're reported happen when you set audio system to None/Null?
What if you switch Eevee to Cycles and change number of samples/bounces to 1? Will it affect render performance?
It is also very confusing to have 5 different bugs reported in a single report. Those doesn't seem to belong to the same area, and handling such reports is tricky. It's usually a good idea to report separate issues separately.
Changed status from 'Open' to: 'Archived'
I came to respond to all the questions, and I find that I am unable to reproduce most of these issues now, either with the version I was on at the time or the current version. I have no explanation. Sorry for the confusion. I'll post again if I can. (Oddly, rendering is also faster now, perhaps 3-5 fps, and unaffected by JACK.)
I will split the reports out next time; I didn't know if they were large enough issues to merit their own report, especially since the repro steps were identical.
Re: bug #4 -- if I want to start the viewport rendering at e.g. frame 105, it appears that I can not do that unless I change the start position of the animation ("Frame Start / End"). Meaning, the position of the play cursor is irrelevant to the start position of the animation. In my report, I was referring to the fact that having AV Sync enabled and using JACK seemed to "fix" this "bug", because rendering would start where the cursor was. But again, I cannot reproduce this now: now it starts at the beginning (Frame Start) no matter what the settings are.
Last I dealt with my audio config, JACK was necessary to use my audio interface as my OS default interface. (It may no longer be true.)