I am trying to render 5 MOV files, 1080p, into a mpeg-2 file, and the output to melt tells me that 99,900 frames have to be rendered. My problem is that the rendering goes slower and slower and slower until it finally stalls around 72,792 frames and hangs after about 18 hours. The memory usage is 24% and I don't see anything unusual, except a complete stall occurs.

I am using kdenlive 18.12.1 with Melt 6.12.1 on an openSuse Leap-15.0 linux system.

What should I look for? Can anything be done about this rendering problem?

-AG

Using htop showed me that kdenlive is forking and the processes are suspending. I counted 43 melt processes and 43 kdenlive processes. I noticed that occasionally another fork would occur and more processes added to the suspended list. The Linux system was able to handle this, but since it can only do 1 task at a time, it was gradually slowing down as more forked processes were added.

Question: Why is kdenlive forking new processes?