[Bug] Can not exit vlc properly when you close the app while playing

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Rémi Denis-Courmont
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 19 Aug 2020 21:21

If you don't believe, you can get a stack trace of the frozen VLC and see for yourself that it's Mesa that's locking up.
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby charno » 19 Aug 2020 21:23

I believe that the hang is in the mesa stack, and that there is a bug there.

I just think it's a bug that a feature (exiting vlc) works when accessed one way (Ctrl+q or menu), but not another way (x or Alt+F4). And that one is definitively on the vlc side.

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 29 Aug 2020 09:53

I don't know if there is or is not a bug in the VLC GUI, or in the QtGUI library that ends up triggering the Mesa bug(s). I cannot reproduce the issue so I have no ways to ascertain that.

If somebody can reproduce the problem, they're most welcome to investigate.
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby gregoiregentil » 29 Aug 2020 11:28

Ubuntu 20.04 with gnome and I have the same problem. Is it going to be fixed?

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby 100% » 10 Sep 2020 00:27

̶I̶t̶ ̶l̶o̶o̶k̶s̶ ̶l̶i̶k̶e̶ ̶i̶t̶'̶s̶ ̶b̶e̶e̶n̶ ̶f̶i̶n̶a̶l̶l̶y̶ ̶f̶i̶x̶e̶d̶ ̶w̶i̶t̶h̶ ̶t̶h̶e̶ ̶l̶a̶t̶e̶s̶t̶ ̶K̶u̶b̶u̶n̶t̶u̶ ̶2̶0̶.̶0̶4̶ ̶u̶p̶d̶a̶t̶e̶s̶,̶ ̶a̶t̶ ̶l̶e̶a̶s̶t̶ ̶f̶o̶r̶ ̶m̶e̶.̶ ̶C̶a̶n̶ ̶a̶n̶y̶o̶n̶e̶ ̶c̶o̶n̶f̶i̶r̶m̶?̶

Sorry guys, it would appear I've spoken too soon, the problem still persists.

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby roberthr » 29 Sep 2020 06:12

I think it has something to do with desktop scaling. If I set scaling to 125% VLC hangs after quit. When I put it back to 100% it closes normaly. It happens in both KDE Plasma and Gnome on Ubuntu.

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby roberthr » 12 Oct 2020 19:21

Nope, it's not scaling but Xorg. With Wayland obviously closes properly.

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 16 Oct 2020 17:48

No, it's not Xorg. As noted up-thread, it's a combination of two bugs:

1) MesaGL locks up when the video window is unmapped too early (reminder link: https://gitlab.freedesktop.org/mesa/mesa/-/issues/116 ).
2) The VLC GUI unmaps the X11 video window before GL rendering is stopped.

This bug also affects (VLC on) XWayland. Of course it won't affect pure Wayland, though there are outstanding other issues with VLC on Wayland.
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby roberthr » 20 Oct 2020 16:21

I think I might found the workaround. In VLC settings, go to Video and change Output from Automatic to X11 (XCB). No more hanging since then

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 20 Oct 2020 19:01

Yes but you'll ruin the performance by doing that.
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby roberthr » 24 Oct 2020 18:13

Well, the experience is already ruined,so performance impact does not make it much worse.

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby iagreetoo » 31 Oct 2020 21:39

I have the same issue with the latest Manjaro (I have to kill VLC v3.0.11.1 to be able to close it)

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 01 Nov 2020 11:39

Stop the video before you close VLC.
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby roberthr » 04 Nov 2020 14:45

Stop the video before you close VLC.
Does not work most of the time

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby videbob » 04 Nov 2020 15:22

According to mesa, this bug was fixed in version 20.2.0. I'm not so familiar with Manjaro but with Ubuntu-based distros you may need to use an external ppa to get the latest version.

https://docs.mesa3d.org/relnotes/20.2.0.html

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Tidy » 05 Nov 2020 12:10

I am running Kubuntu 20.10 with MESA 20.2.1, problem still persists.

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 05 Nov 2020 16:20

Mesa rolled back the fix in latest versions, so the bug is back.
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby rmdegennaro » 08 Nov 2020 16:54

I think I might found the workaround. In VLC settings, go to Video and change Output from Automatic to X11 (XCB). No more hanging since then
Thank you, this worked for me; on a fully update Kubuntu 20.04 machine. Reading through the thread ruins the experience as much as the actual bug. :-(

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby hache » 15 Nov 2020 06:24

Hello World!, I have the same Issue with Ubuntu 20.04 Mate with VLC v3.0.9.2 installed from "Software Boutique" (official repo) and the only way to avoid the issue was setting only one instance.

To do this just go to VLC Player : [Tools] > [Preferences] > [Interface] > check "Allow only one instance" and save.

In this way no matter if you close the VLC Player with (x) icon and get freeze in system try or background. Next time you open a media flie or a new instance of VLC this setting will force to close previous instance and open a new one so you no need to kill the old instance. I know this is just a "workaround" but I think it's better than kill the freeze instance each time you forgot to stop and close. Let's be honest, we all close without stop because this is the fast way we do in all player for last 20 years and that will not change in the user mind for next 20 years.

Hope this tip help meanwhile to wait a fix from VideoLan Dev Team. Please if it works for you, consider to share the info about OS, Desktop Environment and VLC Version to help other users.

HACHE from Argentina (sorry for my broken English but I speak Spanish!)

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby linkfanel » 16 Nov 2020 11:18

Hello,

We believe that one of the triggers for this bug, in particular for the part within VLC's Qt5 GUI, could be a latent issue that was revealed by some change in a newer Qt5 release. To help us investigate and diagnose this, could any reporter please share, on top of your distribution and its release version, your libQt version too? And whether the issue goes away when downgrading to older versions?

Also, can you please consider filing a bug with your distribution about it, if one doesn't exist already, mentioning it's a possible issue involving newer Qt versions? Our upstream ticket would be https://trac.videolan.org/vlc/ticket/21875 Please report to us the links to these distributions ticket.

Thanks, hopefully with your help we can sort it out.

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby argumon » 25 Nov 2020 17:41

Same problem here on openSUSE Tumbleweed for about half a year and I am doing regular (mostly daily) updates.
Setting 'Only one instance' does not help here, but changing Video output to X11 fixes it.

I am running Tumbleweed with KDE on X11.
Actual version is:
AME="openSUSE Tumbleweed"
# VERSION="20201123"

libQT5Core5 version is 5.15.1-5-1x86_64

I will file a bug for Tumbleweed later (if there isn't one already).

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby korrode » 02 Jan 2021 06:37

Will be pretty lame if there's not to be any solution to this from VLC's end and Debian 11 is released with a Mesa stack that still has this issue.

Someone suggested a possible workaround at VLC's end could be to pause the video before exiting. Is this a possibility, Rémi?

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 03 Jan 2021 10:15

There are two bugs, one in Mesa. There is another bug in either the VLC Qt plugin or in the Qt5GUI library that makes VLC destroy its window too early. Nobody cares to investigate it as it's much easier to blame the symptoms on Mesa.

I certainly don't have the Qt expertise, time and motivation to look at it myself. Patch welcome.
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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby tofuser » 03 Jan 2021 21:55

Happy New Year everyone :D
I also have this bug on VLC 3.0.9.2 with Ubuntu 20.04.1 LTS.
I can add to what has already been said that the bug does not occur on all h264 videos.
If anyone is interested in reproducing the bug I can send her/him a very light 8s h264 video (158 kB) ?
If it can help I have another 8s h264 video that present no bug or I can send terminal output in debug mode (export VLC_VERBOSE=3) ?

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Re: [Bug] Can not exit vlc properly when you close the app while playing

Postby Rémi Denis-Courmont » 04 Jan 2021 10:01

Thanks but I don't think it's really dependent on the video, just timing (and the GL drivers).
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