I've been using Kdenlive and rendering fine. Suddenly whenever I click the render button Kdenlive crashes.
This is similar to bug http://www.kdenlive.org/mantis/view.php?id=2861 but that was fixed in 0.9.4. I'm using 0.9.6. Also, the workaround of creating a new project with the "hdv 1440x1080i 25 fps" doesn't work. It still crashes.

It could also be bug http://www.kdenlive.org/mantis/view.php?id=2662. There's no tips on how to proceed though. Any ideas?

I'm using Kdenlive 0.9.6 on Ubuntu 12.10 with melt 0.8.8.

I've tried downgrading to Kdenlive 0.9.2 and melt, libmlt5, libmlt-data 0.8.0-4. These are the versions in the Ubuntu Quantal repositories.
It still crashes. The crash report shows it's a floating point exception which makes me lean towards Bug #2662.

Any ideas? This makes Kdenlive useless.
Can I generate the script to render without opening the render dialog box somehow?

Hi,
I had the same problem due to a corrupted project file.
I solved the problem by opening the project with an older version of kdenlive (0. - some things lost, but after reworked on the project rendering worked well.

Try running kdenlive or kdenlive_render in a shell and see it they generate errors.

Kdenlive crashes even if I start up and use the default profile or create a new project using the HDV 25 fps profile (workaround for bug 2861). So, I don't think it is related to my project file.

When run at the command line when I press render, it prints:
KCrash: Application 'kdenlive' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/pfong/.kde/socket-ir-pftp/kdeinit4__0

What commandline do I use with kdenlive_render? I don't understand it's commandline parameters. Without any parameters it just prints it's help message.

I'm wondering if the custom render profile that I created is causing problems. Where are these stored? Can I reset this somehow?

Hi pfong,

That KCrash error looks serious and like something in the KDE configuration is messed up. In the meanwhile maybe this work-a-round will help.

PRO TIP: Render Kdenlive Projects in Openshot

The video is over 18 months old and I haven't tried it myself but it sounds plausible. I hope this helps.

Glenn

pfong wrote:Kdenlive crashes even if I start up and use the default profile or create a new project using the HDV 25 fps profile (workaround for bug 2861). So, I don't think it is related to my project file.

When run at the command line when I press render, it prints:
KCrash: Application 'kdenlive' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/pfong/.kde/socket-ir-pftp/kdeinit4__0

What commandline do I use with kdenlive_render? I don't understand it's commandline parameters. Without any parameters it just prints it's help message.

I'm wondering if the custom render profile that I created is causing problems. Where are these stored? Can I reset this somehow?

Luckily I had generated a rendering script. Using the script to render works fine. This means kdenlive_render works fine. This is my work around to avoid using the render dialog.

Generating this script was the last successfully thing I did with the render dialog. I wonder if that's related.

I just tried to work on a new project. Unfortunately, Kdenlive still crashes when I open the render dialog and I cannot use the render script I generated for the other project. I just get a video that says "INVALID".

I have found that when I run Kdenlive in a newly created user account, it does not crash when I open the render dialog. How do I reset the settings in my account? I've tried removing the .kde directory in my home directory and logging out and back in. The makes Kdenlive do the setup wizard again but it still crashes. What other files do I need to remove?

pfong wrote:I just tried to work on a new project. Unfortunately, Kdenlive still crashes when I open the render dialog and I cannot use the render script I generated for the other project. I just get a video that says "INVALID".

I have found that when I run Kdenlive in a newly created user account, it does not crash when I open the render dialog. How do I reset the settings in my account? I've tried removing the .kde directory in my home directory and logging out and back in. The makes Kdenlive do the setup wizard again but it still crashes. What other files do I need to remove?

Does the render screen come up at all?

We need more clues. Try this:

Create a project
Add a color clip to the project
Add the color clip to the timeline
Save the project
Hit the render button.

As Kdenlive uses the Melt / MLT framework looking for ~/.melt or ~/.mlt would be a good start, followed by files named "mlt" or "melt" below ~/.config or ~/.local.

Steve Guilford wrote:Does the render screen come up at all?

We need more clues. Try this:

Create a project
Add a color clip to the project
Add the color clip to the timeline
Save the project
Hit the render button.

It crashes as soon as I press ctrl-r or click on the render button. I do not see the render dialog.

I tried:
1. Open kdenlive
2. Blank project is already there.
3. Add color clip
4. Add to timeline
5. Press render button. Crash.

It also crashes if I leave out steps 3 and 4.

bcooksley wrote:As Kdenlive uses the Melt / MLT framework looking for ~/.melt or ~/.mlt would be a good start, followed by files named "mlt" or "melt" below ~/.config or ~/.local.

I did not find ~/.mlt or ~/.melt or any files with mlt or melt in the name under ~/.config or ~/.local. E.g. find .config/ -name "*mlt*" returns nothing.

I would suggest running Kdenlive under strace to determine the configuration files and other user specific data it is accessing.
Also, please verify that ~/.kde is the prefix used by KDE for user specific data, by running "kde4-config --localprefix" as it could be using ~/.kde4.

pfong wrote:It crashes as soon as I press ctrl-r or click on the render button. I do not see the render dialog.

I tried:
1. Open kdenlive
2. Blank project is already there.
3. Add color clip
4. Add to timeline
5. Press render button. Crash.

It also crashes if I leave out steps 3 and 4.

Well, it's either in MainWindow::slotRenderProject() or within the RenderWidget::RenderWidget constructor which is called by slotRenderProject.

One of the possibly suspect lines within slotRenderProject could be:

QString projectfolder = m_activeDocument ? m_activeDocument->projectFolder().path(KUrl::AddTrailingSlash) : KdenliveSettings::defaultprojectfolder();

If your project folder or default project folder is buggered up this line may segfault out. Take a look and see if your project directory is valid when Kdenlive is running and upon it's settings page.

If you're adventurous you can gen up a freshly compiled copy of Kdenlive. Follow the instructions here http://www.kdenlive.org/user-manual/downloading-and-installing-kdenlive/installing-source under the section labeled Build Script to do so. Then, try to reproduce the problem w/ the freshly compiled version of Kdenlive. If the problem persists then we can add qDebug() statements to the aforementioned routines to narrow down the location of the error.

"kde4-config --localprefix" confirms that the kde prefix is .kde

I posted my .kcrash in bug 2662. The backtrace does show it crashes in something the RenderWidget::RenderWidget constructor calls.

How do I see what the project directory is? The crash happens even if I load an existing project. Does it use the location of the project file as the project directory?