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Old 02-23-2020, 03:13 AM   #1
claudecat
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Video thumbnails on new ktown install


I've had this issue consistently, for years now, with Slackware's KDE, whether it was the old version or the vastly preferable ktown collection provided by the esteemed alienbob.

I simply can't get video thumbnails to work in dolphin. This despite the fact that they work when I use the live USB. Once installed, it's nada.

I've tried installing all manner of gst-plugins, even mplayerthumbs, which worked a few years ago when I posted on this same issue but seems not to now.

If I look at ksysguard when I open a folder with video files, there is a thumbnail.so process working for a little while, but it goes away before any thumbs are actually displayed. Oddly, for a brief moment after I had installed mplayerthumbs, I did see about a half a folder's worth of thumbs, but when leaving and reentering the folder even those disappeared.

I'm frankly stumped as to what's going on here, as I certainly do have the ffmpegthumbs package installed and all the correct settings set in dolphin. Any ideas from the experts here? It's admittedly a minor issue, but I'd still like to figure it out if possible...

I'm using the latest liveslack iso from a few days ago, now fully updated, and aside from the nvidia .run file doing the graphics and a few larger packages being removed (texlive, rust, a few others) it's all as originally installed. Thanks in advance if anyone knows what's up!

Last edited by claudecat; 02-23-2020 at 03:14 AM.
 
Old 02-23-2020, 07:30 PM   #2
claudecat
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OK, upon closer examination, it seems that it's probably the graphics driver causing this issue (NVIDIA-Linux-x86_64-340.108.run* in my case).

I got extra-curious/bored and decided to do a careful reinstall of the ktown iso, checking at every step to see when the thumbnail issue popped up. So far, with nouveau, no problems at all. In my experience with nouveau however, it's only a matter of time before the system locks up (as it had already during the initial install from live session, requiring a do-over).

I guess I'll stick with nouveau for now, but this all begs the question: why does only Slackware present this problem? I have several other distros installed and using the 340 driver, none of which have issues with dolphin video thumbnails (those that are KDE anyway). Only my openSUSE Tumbleweed install necessitates nouveau, and yes, even that will occasionally lock itself up. Bizarre...

Anyone have anything to add to this puzzler? I'd really like to be able to use the proprietary driver AND get dolphin thumbnails on Slackware!

* yes, I'm aware that this driver is basically eol at this point. Still works with other distros though, even cutting edge ones like Arch, and installs fine with the 5.4.xx kernels on Slackware. Only Gentoo requires me to use an ancient kernel (4.14.xxx) to get it working properly.
 
Old 02-24-2020, 12:04 AM   #3
chrisretusn
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Hmm...

Slackware64-current
Latest ktown

NVIDIA-Linux-x86_64-390.132.run
xf86-video-nouveau is installed but blacklisted by xf86-video-nouveau-blacklist from extra

Video thumbnails display and play in the Dolphin Information Panel on this system.

mplayerthumbs is not installed, this is part of Slackware64-current's KDE4
ffmpegthumbs IS installed which is part of Alien Bob's ktown.

Only the gst-plugins that come with Slackware64-current


I also have Alien Bob's ffmpeg from his redistricted repository installed in place of the ffmpeg that comes with Slackware64-current.

Last edited by chrisretusn; 02-24-2020 at 12:07 AM.
 
Old 02-24-2020, 03:24 AM   #4
claudecat
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@chrisretusn:

Interesting... I've been reluctant to try again with the 340 driver, but maybe I will after all, if only to confirm that it's the culprit. I mean, nouveau has hard-locked on me a few times now, so the system is unstable as is anyway.

My install matches yours with the .run file version number the sole difference (card is a GeForce GT 240). Seems alienbob's restricted version of ffmpeg is installed by default from the latest iso and I haven't bothered with additional gst-plugins or mplayerthumbs with this latest install since thumbnails do indeed work with the ever-flaky nouveau.

Wait... I relied, as always, on the driver install process to do the blacklisting rather than installing the package from extra, so maybe that could be something? I'll try both ways and see I guess. I hope I can remember how to properly re-enable nouveau if need be! Actually I'll probably just opt for stability over the cosmetic value of seeing thumbnails if it comes to that...

I'll report back once I have time to try installing the 340 driver again.

Thanks for the reply/input!
 
Old 02-24-2020, 06:23 AM   #5
chrisretusn
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Quote:
Originally Posted by claudecat View Post
@chrisretusn:

Interesting... I've been reluctant to try again with the 340 driver, but maybe I will after all, if only to confirm that it's the culprit. I mean, nouveau has hard-locked on me a few times now, so the system is unstable as is anyway.
I am using the 390 driver. I have a legacy card.
Code:
Graphics:  Card-1: NVIDIA GF108 [GeForce GT 730] driver: nvidia v: 390.132 bus ID: 02:00.0 chip ID: 10de:0f02 
           Display: server: X.Org 1.20.7 driver: nvidia resolution: 1366x768~60Hz 
           OpenGL: renderer: GeForce GT 730/PCIe/SSE2 v: 4.6.0 NVIDIA 390.132 direct render: Yes
Quote:
My install matches yours with the .run file version number the sole difference (card is a GeForce GT 240).


NVIDIA-Linux-x86_64-390.132.run does not match
NVIDIA-Linux-x86_64-340.108.run

Quote:
Seems alienbob's restricted version of ffmpeg is installed by default from the latest iso and I haven't bothered with additional gst-plugins or mplayerthumbs with this latest install since thumbnails do indeed work with the ever-flaky nouveau.
I only mentioned the Alien Bob ffmpeg as it might be a reason since the stock ffmpeg is missing some codecs. I tested this theory out a short while ago. Upgraded the Alien Bob ffmpeg to the stock ffmpeg. I was still able to play thumbmails in Dolphin with the stock ffmpeg installed.

You shouldn't need additional gst-plugins or mplayerthumbs.

My experience with nouveau driver is quite good. It works with Steam quite well. That said, Steam works better (to me at least) with the NVIDIA driver installed.

Quote:
Wait... I relied, as always, on the driver install process to do the blacklisting rather than installing the package from extra, so maybe that could be something?
Here is what "xf86-video-nouveau-blacklist" installs /etc/modprobe.d/BLACKLIST-nouveau.conf:
Code:
# Do not load the kernel nouveau dri module, since it interferes with both
# the nv and binary nvidia drivers.

blacklist nouveau
This is what the NVIDIA installer installz /etc/modprobe.d/nvidia-installer-disable-nouveau.conf:
Code:
# generated by nvidia-installer
blacklist nouveau
options nouveau modeset=0
For what it is worth. I leave the "xf86-video-nouveau" driver installed and blacklisted when running with the NVIDIA driver.

To use the NVIDIA driver, I first install the "xf86-video-nouveau-blacklist" package in extra, then reboot. Then install the NVIDIA driver using NIDIA's installer.

To go back to the "xf86-video-nouveau" driver, I remove the "xf86-video-nouveau-blacklist" package, then reboot. Then
run the NVIDIA installer with the --uninstall switch. As an extra I also reinstall the "mesa" and "xorg-server-*" packages.

Last edited by chrisretusn; 02-24-2020 at 06:27 AM.
 
Old 02-24-2020, 09:15 AM   #6
Regnad Kcin
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There is an option called "Show Previews" in dolphin that turns the thumbnail pix on and off. they take up space hence a reasonable need for on/off. I keep a button for each of "Split", "Show Menubar", "Show Panels", "Show Previews", and "Terminal" on my dolphin Toolbar. Of course they get reset to some post-millennialized default style after each upgrade of ktown but c'est la vie and it's no sweat to fix it back.

The loss of my friend the menu bar in so many apps these days and the increasing difficulty in finding how to put it back is ever a problem. I do miss some of the lovely icons and themes of KDE4 but Plasma 5 is better in terms of function.
 
Old 02-24-2020, 09:37 PM   #7
claudecat
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OK, after installing the xf86-video-nouveau-blacklist package, rebooting and installing the proprietary driver, it's just as I'd suspected. There's something about installing the NVIDIA-Linux-x86_64-340.108.run graphics driver that causes the video thumbnails not showing/being created in dolphin problem. I don't know enough about the inner workings of Slackware's implementation of opengl or whatever it is that gets borked in this change from nouveau to the proprietary driver to even begin to diagnose or fix the issue.

Given the choice between the nouveau driver, which causes my system to predictably lock up at random intervals (on any distro), and the NVIDIA driver, which works flawlessly aside from not showing the video thumbnails in dolphin (only in Slackware!), I'm going to opt for stability and stick with the proprietary driver.

As an aside, thunar works just fine in terms of showing video thumbnails. It's just dolphin. Frustrating, curious, but ultimately I can live with it on a system that isn't used as my daily driver (that changes week to week - Debian sid lately, KDE Neon before that, before that it was Arch) anyway.

Thanks for reading/replying! Still open to suggestions...
 
Old 02-25-2020, 01:06 AM   #8
Alien Bob
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My desktop computer with latest Slackware64-current, Plasma5 and a NVIDIA binary driver installed, displays video thumbnails just fine. So it is not the NVIDIA driver that is the issue here.
 
Old 02-25-2020, 02:17 AM   #9
claudecat
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Quote:
Originally Posted by Alien Bob View Post
My desktop computer with latest Slackware64-current, Plasma5 and a NVIDIA binary driver installed, displays video thumbnails just fine. So it is not the NVIDIA driver that is the issue here.
OK, I'm open to suggestions then as to what it could be? All I know is what I've reported: thumbnails work with nouveau, and as soon as I install the NVIDIA driver, they suddenly do not. Could it be something that only presents itself on my admittedly ancient hardware (old Intel i7 K 875 CPU, with a GeForce GT 240 PCIe card, other specs on request)?

The fact that I have several other distros installed with KDE, up to date kernels and the same version of the driver (Arch and Manjaro, Mageia cauldron, PCLinuxOS, plus older kernels in Neon, Debian sid, Gentoo and Pisi), all of which DO show thumbnails in dolphin, leads me to the amateur conclusion that maybe it's somehow specific to Slackware. It even used to happen when I had the old KDE 4 from 14.2. I used mplayerthumbs as a workaround IIRC.

Not trying to dis Slackware or your great work with ktown and everything else you do, simply trying to understand/fix a real issue that does indeed happen on MY hardware.

As a relatively clueless Linux user (compared to folks here at least!) of over ten years now, I just don't have the technical knowledge to diagnose this beyond what I've offered in this thread, hence my hope that someone could at least point me in the right direction to further research this. Believe me, I've googled quite a bit with nothing matching this scenario coming up.
 
Old 05-25-2020, 11:47 PM   #10
claudecat
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I thought I'd update this thread by confirming that the issue seems to have been specific to the 340 series of nvidia drivers, or the GT 240 card itself. I just swapped in a GT 430 card and installed the 390 driver and all is well. Thumbnails working just as expected all along.
 
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