Hi,

I have a video where I use the same video 3 times (cellphone recording, vertical format), side by side, I use composite and transform to show all 3 of them at the same time, plus a title, so I got 4 video tracks. When I render, it crashes every time. How can I troubleshoot this and see what is in fact crashing?
The codec I'm using is h264 and a mp4 container.

First you can start kdenlive in a command shell, then you will see more output. Second you can check the textfile in the neighbourhood of your output renderfile (same name, extension .txt). In the last lime of the textfile you will find a number representing the last frame rendered. Now you can calculate where in your project the error occurs. In an older version some transitions broke my renderings, leaving them away helped.

Thanks for the tip. I'm only use composite and transform as effects to show all 3 videos at the same time.
I'm using an appimage, does anybody know how I can run Kdenlive inside a command line inside the appimage container? Or is there any way to log the debugging info into a logfile?
I'm using Debian stretch and getting a new version from Kdenlive is pretty much impossible due to completely different libs.

Thanks,

Markus

So, just to get closer to the solution: Is there a composite or transform effect/transition at the frame where rendering stops?

To run kdenlive in a shell, open a shell in the directory where you unpacked the appimage, type "./kdenlive" and press enter.

More information about creating detailed information: https://userbase.kde.org/Kdenlive/Manua ... cktrace.29

How do I extract an appimage? I am running it by just executing the file with the .appimage ending. Will the image still work after extraction?

EDIT: Found out how, running the render now.
Is it normal that it does not max out the 4 CPU cores I have?
I see a load average of 2, which is half of what my whole system can do.

Good to hear you can render now. Yes, it is normal that kdenlive does not max out multicore systems. For more information about this topic, you will find some threads in this kdenlive forum with the search function.

The render does not crash anymore on the newest stable appimage 17.12.0d, good job fixing these bugs!
And now I even know how to troubleshoot it next time around.