avidemux on Mac - default settings are fine

Verified that with the default settings on Avidemux 2.8.2 compiled for ARM on Mac,

MPEG4 ASP (xvid4) video and AC3 lav audio work for playout on the DVD player, 1920x1080.

For 4K - 3840x2160 - the Videotoolbox HEVC default settings are 2000 bitrate and 4000 max bitrate, which can be increased to 5000 bitrate and 8000 max bitrate to be on par with the settings in python-ffmpeg-warp.