A variation of the question has been asked last year, but the answer (if there was actually an answer) was too technical for me. And the difference in file size that I’m talking about is factor of ten.
I used a simple subject: one still image (1920x1080 JPG), repeated to yield a 15-second mp4 video. (In Shotcut, obtained by setting “Properties.” In Avidemux, obtained by using Copy and holding down the Paste key combination (Ctrl-V) until the desired length was reached.) No motion, no audio.
–Shotcut file size: 14MB-18MB, depending on settings. Smallest file (14MB) was Yadif temporal & spatial, Bicubic. All other settings (various combinations of Linear Blend, One Field, Yadif Temporal with Nearest Neighbor, Bicubic, etc.) yielded files 18MB-19MB in size.
–Avidemux file size: 1.68MB (medium quality), 2.78Mb(maximum quality)
Quality: no visible difference (except that Avidemux generated a more saturated image, with higher contrast).
Is there any way to get the Shotcut output file size down to anything close to the Avidemux size?