Crash on add selected to timeline

Bug
#1

I am able to crash Shotcut 20.04.12 consistently when adding multiple mp4s from the playlist to the timeline using the Playlist “Add selected to timeline” option.

Though perhaps a coincidence, the crash occurs when the source window is active and its content is paused within the clip. When the cursor is at the 0:00 position or (on reload after the crash) the source window inactive, the timeline loads from the playlist without a problem.

I am running Windows 10.0 Build 18363 on a Dell Inspiron 15-3567

#2

I have not been able to reproduce this. I tried with an existing timeline as well as removing all tracks to let it create V1 as well as adding V2 and sending to there. I tried about 10 times with up to 16 playlist items selected (all videos except 1 audio).

I struggle to understand how that could make a different per the code. I tested with both a playlist item in Source as well as something not in Playlist or Timeline. I also tested while Source is playing.
But thanks for trying to help by reporting your problem. Maybe some more information will come to light - some other condition required to reproduce the bug.

#3

Yes, it did not make any sense to me either, but it was the only consistency I noticed.
I no longer can reproduce it either. But it happened four times in a row before I opted to post it as a possible bug. And has happened infrequently before.
Perhaps it is a conflict with some other open application.
I’ll try to remember to run my screen recorder the next time I load multiple clips to the timeline.
Very curious.

#4

I am having a somewhat similar experience.

If I start a project, and add any media to the timeline, Video, Image or Audio. It just closes. Even creating a blank track and it closes. I have tried with OpenGL on and off. Same.

It was working fine on Ubuntu Budgie 18.04, but I have now reloaded to Ubuntu 20.04, and it doesn’t work.

I am running the version of SC from the repository, and trying to work with projects that are 1920x1080x30.

I have a Dell Vostro 1015 with 4GB RAM and a 32GB SDD Swap. Everything I do works flawlessly, but not working with SC since reload.

Gone through the forums and tried all the advice I could find, but nothing made a difference.

#5

Oh, and CPU barely passes 15% while this happens. RAM also clear.

#6

Okay, I removed the one from the Ubuntu Repo, and installed using Flatpak and it seems to work now.

#7

Hi. I’ve a similar more drastic problem after launching Shotcut version 20.02.21 on Ubuntu 20.04 LTS I find if I try to add a video track to the timeline it crashes Shotcut. I have no project files loaded.

Then running it under GDB I can see a crash stack trace. But forum won’t let me post it. Ah I had to remove greater/less than signs :slight_smile:

I’m happy to debug any test code if others cannot reproduce this bug.

#8

Then running it under GDB I see the following crash stack trace:

[Debug ] AudioLoudnessScopeWidget::resetQview begin
[Debug ] KeyframesDock::load> begin
New Thread 0x7fffd5ffb700 (LWP 7746)
[Debug ] Timeline::AddTrackCommand::redo video

Thread 1 “shotcut” received signal SIGSEGV, Segmentation fault.
0x00007ffff7f6c78f in mlt_service_connect_producer () from /lib/x86_64-linux-gnu/libmlt.so.6
(gdb) bt
#0 0x00007ffff7f6c78f in mlt_service_connect_producer () from /lib/x86_64-linux-gnu/libmlt.so.6
#1 0x00007ffff7f763bd in mlt_transition_connect () from /lib/x86_64-linux-gnu/libmlt.so.6
#2 0x00007ffff7f76cfa in mlt_field_plant_transition () from /lib/x86_64-linux-gnu/libmlt.so.6

I’m happy to debug any test code if others cannot reproduce this bug.

#9

Happy days. Problem doesn’t occur if I run:

https://github.com/mltframework/shotcut/releases/download/v20.04.12/Shotcut-200412.glibc2.14-x86_64.AppImage

I can now drag video from my playlist to the timeline.

Looking forward to using Shotcut for the first time after watching the excellent 15 min training video this morning :slight_smile:

#10

Here is a screeencast of a crash in progress https://youtu.be/giQClVT4cVo

#11

I see you are using MLT XML files as virtual clips. That is an important, special detail. I will bookmark this to look into sometime soon.

#12

They did load properly later. I have had the same symptoms with .mp4 and .png and .jpg extensions. All, unfortunately, intermittent.

#13

I see. Well, there was a little bit of change in this area for the next version. Maybe it cleared up some problems. Beta expected tomorrow.

#14

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