Ubuntu
nvidia-graphics-drivers-460 package

nvidia-graphics-drivers-460 causes vlc to crash when taking video snapshot

Bug #1913633 reported by Ian
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
nvidia-graphics-drivers-460 (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

vlc 3.0.11.1-2 would happily take video snapshots with version 450 (and earlier) of the drivers, but crashes instantly every time with 460.

me@mine ~$ vlc
VLC media player 3.0.11.1 Vetinari (revision 3.0.11.1-0-g52483f3ca2)
[000055acea1745b0] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
[000055acea213580] main playlist: playlist is empty
(** attempt to take snapshot via GUI **)
libEGL warning: DRI2: failed to authenticate
[00007f7f840045f0] gl gl: Initialized libplacebo v2.72.0 (API v72)
[00007f7f840045f0] glx gl error: cannot create GLX context
libEGL warning: DRI2: failed to authenticate
[00007f7f840045f0] gles2 gl: Initialized libplacebo v2.72.0 (API v72)
libEGL warning: DRI2: failed to authenticate
[00007f7f840045f0] gl gl: Initialized libplacebo v2.72.0 (API v72)
Segmentation fault (core dumped)

Using PrtSc to get a screenshot works, but doesn't capture the video shown in the vlc window.

Ubuntu MATE 20.10, kernel 5.8.0-41-generic.
nvidia-driver-460 460.32.03-0ubuntu0.20.10.1

See original description
Ian (superian)
description: updated
Revision history for this message
Ian (superian) wrote :

Can confirm that going back to 450 version means vlc video snapshots work again.

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in nvidia-graphics-drivers-460 (Ubuntu):
status: New → Confirmed
Revision history for this message
Ciro Santilli 六四事件 法轮功 (cirosantilli) wrote :

I'm on Ubuntu 20.10, default desktop, nvidia-driver-460, Quadro M1200 GPU, and VLC also crashes for me whenever I try to take a snapshot.

However, I don't get the gl information logs mentioned by OP, is just says "segmentation fault".

I tried reverting to 450, and it still segfaults.

The `--verbose 2` messages corresponding to me clicking the take snapshot button in both cases are:

```
[00007f23600013b0] main vout display debug: VoutDisplayEvent 'mouse button' 2 t=6
[00007f23600013b0] main vout display debug: VoutDisplayEvent 'mouse button' 2 t=7
[00007f23600013b0] main vout display debug: auto hiding mouse cursor
[000055c87ad2f7e0] pulse audio output debug: suspended
[000055c87ad2f7e0] pulse audio output debug: changing sink 0: alsa_output.pci-0000_00_1f.3.analog-stereo (Built-in Audio Analogue Stereo)
[00007f23a40c2d80] main encoder debug: looking for encoder module matching "any": 21 candidates
[00007f23a40c2d80] main encoder debug: using encoder module "png"
[00007f23a4708060] main filter debug: looking for video converter module matching "any": 23 candidates
[00007f23a4708060] swscale filter debug: 1280x720 (1280x736) chroma: I420 -> 1280x720 (1280x720) chroma: RV24 with scaling using Bicubic (good quality)
[00007f23a4708060] main filter debug: using video converter module "swscale"
Segmentation fault (core dumped)
```

Also like OP mentioned, PrtSc does not work on full screen. Outside of full screen it works.

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