Does this command looks like it should work well for video2008.mp4 that is currently at 1920x480 ? ffmpeg -i video2008.mp4 -i audio2008.m4a -q 1 -c:v libx264 -preset slower -s 1920x1080 -map 0:v:0 -map 1:a:0 -y video+audio2008.mp4