Actually both questions are related: to make the clip I use LDCad "export animation" that saves frames as png images. You are given the choice of image size and background color.
Then I assemble the images with AviDemux (just load the 1st images from the images folder, Avidemux loads the other ones). Save clip in the format you want (eg. avi format, codec H264, default settings)
Then I assemble the images with AviDemux (just load the 1st images from the images folder, Avidemux loads the other ones). Save clip in the format you want (eg. avi format, codec H264, default settings)