I've been using Kdenlive for a few weeks now. I'm running 16.12 on Ubuntu Studio 16.04 currently. So far, everything has been working relatively well, save for a few minor bugs which were solved by closing and reopening Kdenlive.

However, I have a much more annoying problem at the moment.

I have an HD 1080p project which is about an hour long and which takes 5 hours to render on the dual-core AMD Athlon II 255 machine I've been using. This would be OK to do once, but there's a problem with the A/V sync in one of the clips and I need to re-render the project. I don't *really* want to tie up my system for another 5 hours.

I copied the project to another computer of mine, a quad-core Phenom II 945. The video rendered in 1 hour with 4 threads and there were no error messages from melt. Apparently, everything went fine. BUT the resulting file was corrupted and only about 200MB (for reference, the first, working render I did with the other machine was 6.5GB)
I rebooted to try again and checked the filesize as it began rendering. It would only increase by a few kB every second. In comparison, the rendered file would increase by a couple of MB each second on the 'working' machine.

I don't know what the problem is. I'm using the same Linux distribution and the same version of Kdenlive installed from the PPA. My only conclusion is that it doesn't like the different CPU, but that doesn't really make sense.


Does anyone have ideas on how I can track down the problem? The project plays in the preview\monitor just fine. It's all a bit strange!

Maybe this report is related to the following threads:
viewtopic.php?f=272&t=138093
viewtopic.php?f=272&t=138364

As I reported in the ohter threads, rendering fails if I start from beginning of the timeline. Setting an in an out point around the failing transition and then render the area did work well, including the transition that failed before.

Your title lets me now think, the error might be related to rendering with multiple processes in parallel. I will check this and render my project with one thread again.

Just tested to render with one thread. That does not solve the problem, rendering breaks at the same frame as always.

Updated to kdenlive 16.12.1 and rendering still breaks at the same frame.

My problem seems to have been fixed after an upgrade to the latest packages on the PPA.

please mark as solved.