Cant add window capture (xcomposite) in obs 26.0.0-rc2-16 build from source with browser-source on ubuntu 20.04.1 LTS

[koreanfan]

Platform

Operating system and version: Ubuntu 20.04.1 lts with latest updates
OBS Studio version: 26.0.0-rc2-16

Expected Behavior

add window capture, choose game window, and start stream

Current Behavior

click to add window capture, set name for window capture, press ok and obs freeze and not responding

Steps to Reproduce

1.build obs from source with browser source
2.add window capture
3.set name for window capture and press ok
4.obs freeze and not responding

Additional information

[KOLANICH]

I confirm that this issue exists in the current version built from git.

[KOLANICH]

Also I advice to rename the issue for better discoverability. I mean incorporate the word "hang" into the title.

[jimchrist-x]

I have the same issue

[ahefner]

Same here, built on Ubuntu 18.04 from commit 08ebc25

#0 0x00007ffff2f7f9f3 in futex_wait_cancelable (private=, expected=0, futex_word=0x5555563046e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 0x00007ffff2f7f9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5555563045c0, cond=0x5555563046c0) at pthread_cond_wait.c:502
#2 0x00007ffff2f7f9f3 in __pthread_cond_wait (cond=0x5555563046c0, mutex=0x5555563045c0) at pthread_cond_wait.c:655
#3 0x00007fffed5c29fd in () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#4 0x00007fffed5c2e89 in () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#5 0x00007fffed5c004d in XInternAtom () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#6 0x00007fffa5e3786f in XCompcap::ewmhIsSupported() () at /home/hefner/obs-studio/plugins/linux-capture/xcompcap-helper.cpp:57
#7 0x00007fffa5e379fb in XCompcap::getTopLevelWindowsabi:cxx11 () at /home/hefner/obs-studio/plugins/linux-capture/xcompcap-helper.cpp:100
...

Never returns from that futex_wait_cancelable, whatever that means. Befitting Murhpy's Law, it works fine if I run it under Valgrind, aside from being too slow to use...

[Chiitoo]

For what it is worth, I can't re-produce here on Gentoo Linux, with OBS Studio at 26.1.0-rc1-18-g08ebc25e.

The terminal output could be a good start on looking for what's different for you who do see the issue happening.

[kkartaltepe]

If you can reproduce this, try applying this patch and see if anything changes.

diff --git a/plugins/linux-capture/xcompcap-main.cpp b/plugins/linux-capture/xcompcap-main.cpp
index 9d3b15333..e82862fb5 100644
--- a/plugins/linux-capture/xcompcap-main.cpp
+++ b/plugins/linux-capture/xcompcap-main.cpp
@@ -24,6 +24,8 @@ bool XCompcapMain::init()
                return false;
        }
 
+       XInitThreads();
+
        int eventBase, errorBase;
        if (!XCompositeQueryExtension(xdisp, &eventBase, &errorBase)) {
                blog(LOG_ERROR, "Xcomposite extension not supported");

[ahefner]

That patch fixes the issue for me, thanks.

…

On Fri, Dec 4, 2020 at 12:18 AM Kurt Kartaltepe ***@***.***> wrote: If you can reproduce this, try applying this patch and see if anything changes. diff --git a/plugins/linux-capture/xcompcap-main.cpp b/plugins/linux-capture/xcompcap-main.cpp index 9d3b15333..e82862fb5 100644--- a/plugins/linux-capture/xcompcap-main.cpp+++ b/plugins/linux-capture/xcompcap-main.cpp@@ -24,6 +24,8 @@ bool XCompcapMain::init() return false; } + XInitThreads();+ int eventBase, errorBase; if (!XCompositeQueryExtension(xdisp, &eventBase, &errorBase)) { blog(LOG_ERROR, "Xcomposite extension not supported"); — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#3479 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABLQMNVUWWBGXILGY6VPSDSTBWJ5ANCNFSM4RPHDSNA> .

[nebspacefarer]

If you can reproduce this, try applying this patch and see if anything changes.

I can't manage to build OBS on my distro despite following the guide, getting some errors about some dependencies versions unavailable on Debian Bullseye, is there any way to have a quick amd64 deb build of that fix before it gets pushed?
Cause it's quite critical to be able to use OBS, no scene management can be done right now because there is no way to add a new Window Capture and no Game Capture feature on Linux