Thanks for suggestion, but I can’t find the Video Mode though… The tab “video” of “advanced” config in the video export dialog, there’s no Video Mode like “vertical” or “horisontal” either. In the File > Video Export menu dialog I see the following:
I can see only Aspect ratio, but it doesn’t help either if I switch numbers X <> Y axis. Can it be related to codec configuration?
I’ve read that GOP should be the half of Frames/sec ratio, is that correct? I’ve also tested with another codec: libx264 instead of h264_videotoolbox, but problem persists. Rate control is set to Average bitrate, B-frames to 3. Codec threads on 0=auto.
I am guessing that the actual problem is indeed somewhere on the surface - there’s a configuration which I don’t know yet impacts on the result.