I found https://github.com/mifi/editly https://github.com/mifi/editly to be an intuitive frontend for this type of task - I used it to create a montage of sever

I found https://github.com/mifi/editly https://github.com/mifi/editly to be an intuitive frontend for this type of task - I used it to create a montage of several clips and was able to easily adjust parameters around timestamps and such to get the montage perfect