warning of running in x11

[MORvfx67]

Hi,
First off I just would like to say how fast this player is. I was amazed when I loaded some 4K exr files into it. It loaded the cache so fast I did not even see it. Playback seems very strong also.

So I running this on "Rocky Linux 9.5 (Blue Onyx)" Desktop is Gnome 40, kernel is "5.14.0-503.31.1.el9_5.x86_64" and the windowing system is Wayland. My Graphics card is Nvidia A4000 and with native drivers. I have Nuke and Fusion and other programs running as expected. I do not have xorg installed on the system.

I installed mrv2 and ran it from a terminal and I get these messages

To run under XWayland, set:

export FLTK_BACKEND=x11

Could not find platform independent libraries
Could not find platform dependent libraries <exec_prefix>

Since I am running Wayland and in your code it would seem that you support wayland natively. Is this just a suggestion, that if you want Xwayland to set that environment setting? I did set it for fun and it would not start.

The other two warnings, are a bit too vague for me. So perhaps you could offer some insight?
Thanks so much

I should also say that it seems to run ok with the way it is setup currently. I did see an issue with OCIO. I had some footage that I did the conversions in NUKE and then in MRV2 and mrv2 seems to produce incorrect values. I will make sure that the OCIO being used is correct, but it seems to be.

Cheers
Mark R

[ggarra13]

@MORvfx67 Hi Mark. A lot of issues, I see. Some questions: what version are you running, where you got it and how did you install it?

You are running a relative old distro which might have some issues with Wayland. For reference, I test under Rocky Linux 8.10 (the official builds on GitHub which follow the VFX reference platform) and Ubuntu 24.04 LTS (my development environment). They are mostly compatible. Betas on sourceforge are compiled with Ubuntu 22.04. So, depending where you got mrv2 from, you may see more or less issues in term of compatibility with your system. Also, if you install from the .rpm or run it from a .tar.gz file, you might end up with conflicts with libselinux.so.1, which might be the "platform" warnings you see.

1. The "export FLTK_BACKEND=x11" is indeed used to run it under XWayland when in Wayland. I'll test it if it crashes on RL10 and Ubuntu 24.04 LTS.
2. The platform messages indicate some library incompatibility but nothing that you should be concerned with. As I said, it migth be a libselinux issue, perhaps?
3. For the Nuke/mrv2 color difference, please open a Bug in the "Issues" section, with an image (exr?) that shows the issue, your .ocio file if you are using a custom one (and the ICS, Display/View and Look you use), and two PNG screenshots (ideally fullscreen) of what you see on Nuke and what you see on mrv2. If you don't or can't share the images, package all that in a zip and send it to my ggarra13@gmail.com address.

[MORvfx67]

Hello, thanks for the fast reply.
I am running your latest version of mrv2 v1.3.6 - Built Mar 17 2025 09:06:27 - Release
I downloaded the .rpm file from github and installed using rpm, I guess that would be obvious :-)
hmmm, I don't think my distro is old. It is newer than Rocky 8.10. I am on Rocky Linux 9.5 (Blue Onyx). I am on this, so I am current, and Nuke, my primary software, is compatible with it. Well, the version 15.v2 I am using says to use rocky 9. :-)
So are you using a beta of Rocky Linux 10? Just curious as you said you would test on RL10?

I want to do a bit more testing on the ocio colour issue. So I will get that info to you in a zip most likely after that.

Cheers
Mark Rasmussen

[MORvfx67]

Hey just to let you know I sent the images etc via your email.

[ggarra13]

Sorry. I read Rocky LInux 8.9 and I meant I test on RL 8.10.
I tested the FLTK_BACKEND=x11 and can confirm that XWayland is broken on my Rocky Linux 8.10. Same binary on Ubuntu 24.04 works without a glitch.
Not only does mrv2 crashes, but so does Chrome, so it seems it is an XWayland issue on RL. You asked me if I suggested x11 and it depends. I've found some OpenGL glitches with Wayland on my NVidia 3800 RTX, but YMMV.

[MORvfx67]

That is interesting that yours crashes on Rocky also. And Chrome. I have no issues with my chrome based browsers :-) I guess Ubuntu has xwayland working correctly? Or maybe it just has up to date wayland running? Just thinking out loud.
The funny thing is, when I run mrv2 it does run, and open files and plays back really well. I just noticed my wacom tablet does not function with it. Kind of strange.

[ggarra13]

I forgot, regarding the speed of playback, most of the credit goes to Darby Johnston who wrote the core over a period of three years. I mostly contributed reverse playback with sound and scrubbing with audio.

[ggarra13]

I do not have xorg installed on the system.

I missed this part. My understanding is that for XWayland to function you need xorg.

[MORvfx67]

Hey I should have been more specific.
I have "xorg-x11-server-Xwayland-23.2.7-1.el9.x86_64" installed and this is required for Xwayland. I was just pointing out that I do not have X11 windowing system installed on my system. I get Nuke to use Xwayland and VLC, but I set the "QT_QPA_PLATFORM=xcb"
and "XDG_SESSION_TYPE=x11" so that it works correctly with Qt.

[MORvfx67]

oh and I also have "xorg-x11-server-Xorg-1.20.11-26.el9.x86_64" also installed.

[ggarra13]

Regarding this:

Could not find platform independent libraries
Could not find platform dependent libraries <exec_prefix>

all issues point to a Python configuration.

Edit:

sudo nano /usr/local/mrv2-v1.3.6/bin/environment.sh

and add:

export PYTHONHOME="${dir}/"

before the PYTHONPATH line. See if the issue goes away.

[MORvfx67]

Yes those two issues have now stopped.
I now only get the FLTK_BACKEND=x11

[ggarra13]

the "export FLTK_BACKEND=x11" line is also printed in environment.sh. If it bothers you, just take it out.

Regarding your wacom tablet, can you boot into an X11 session and see if the tablet works there. I want to know if it is an X11/Wayland issue or a bug in the FLTK toolkit mrv2 uses.

[MORvfx67]

Hey, I can not boot into a X11 session, because I do not have it installed. I am just reluctant to do it. Just paranoid that it will screw up my other software setups. It most likely will not, but I am just a nervous nelly.

[MORvfx67]

I was just thinking what would happen is I set FLKT_BACKEND=wayland. This obviously skips the check in the enviroment.sh script but would it crash. If I use the Wayland backend (if FLTK is compiled with Wayland support), which it seems like it is, tell me if I am wrong. It should run in wayland. It also started up just fine in this mode. Everything seems to work ok graphically anyway.

[ggarra13]

By default mrv2 picks the value of XDG_SESSION_TYPE, so setting FLTK_BACKEND=wayland should be harmless.

[MORvfx67]

So, is it fare to say that mrv2 works correctly under wayland?

[ggarra13]

Yes. The only issues under Wayland known are problems with NVidia drivers.

[MORvfx67]

Right, you mean know problems in general, not specific to mr2? Because yes, X11 does work better with NVIDIA drivers, but I have to say that so far so good with my setup, with the 570 version of my drivers for my Nvidia card. Having said that, I have notice a couple of little strange things. but nothing to crazy.

[ggarra13]

The one thing that prevents me from adopting Wayland right now is Google Chrome/Chromium. Running it under Wayland (or even XWayland) exhibits a keyboard lag, particularly when deleting characters.

[MORvfx67]

Right, I think there is also an issue with dragging files into a chrome browser page. So if a site askes for a file to be uploaded and you can drag and drop. It does not work. Not sure if related but I read about that one.
I use edge for a couple of things and it is chrome based, and no issues. Must be chrome specific.

[ggarra13]

Right, I think there is also an issue with dragging files into a chrome browser page. So if a site askes for a file to be uploaded and you can drag and drop. It does not work. Not sure if related but I read about that one.

Correct. Applications running under XWayland cannot DnD among themselves nor with Wayland applications. For Dnd to work, you need Wayland to Wayland.

[MORvfx67]

So as it turns out, I did have X11 installed, not just the server... so I switched over and the tablet worked, it needed to be setup a bit, but it works. So I hope that helps.

Also, since Xwayland is also able to work on my system, I am a bit confused as to why it is not activating with mrv2 with xwayland. Anyway, food for thought.

[MORvfx67]

When I set FLTK_BACKEND=x11 It does not startup.
This is the error I get

GLFW ERROR: GLX: Failed to find a suitable GLXFBConfig
ERROR: Cannot create window

[ggarra13]

The Wacom model is PTK 840 Intuos 4. Can you expand on what you mean by what X11 configuration?

You said it was working under X11 after you configured it:

it needed to be setup a bit, but it works

What did you have to do under X11 to make it work?

[ggarra13]

GLFW ERROR: GLX: Failed to find a suitable GLXFBConfig

Okay, this is likely a problem with GLX or OpenGL under XWayland. It maybe a configuration, driver or library issue.

Do:

glxinfo | grep -E "OpenGL version|OpenGL renderer"

and report what you get.

[MORvfx67]

Oh sorry that was poorly written on my part. I only switched over the x11 when I logged in again. you know you can hit the gear when you enter your password. I selected x11

The setup was just me, badly, saying that the tablet worked, but I needed to switch the button modes to make it function the way I like.
ie the buttons on top for middle mouse. It was nothing to do with x11 settings.

Cheers

[MORvfx67]

GLFW ERROR: GLX: Failed to find a suitable GLXFBConfig

Okay, this is likely a problem with GLX or OpenGL under XWayland. It maybe a configuration, driver or library issue.

Do:

glxinfo | grep -E "OpenGL version|OpenGL renderer"

and report what you get.

Here is what I get

OpenGL renderer string: NVIDIA RTX A4000/PCIe/SSE2
OpenGL version string: 4.6.0 NVIDIA 570.124.06