Encoder  Spawned Ffmpeg with command: ffmpeg -i ./public/tmp/video.mp4 -i ./public/sample/lego.mp4 -i ./public/sample/solo.mp3 -i ./public/tmp/image.jpg -f lavfi -i nullsrc=s=854x480:d=5 -f lavfi -i anullsrc=d=5 -y -re -filter_complex [0:v:0]scale=854x480[v0];[v0]setdar=16/9[clip0];[1:v:0]scale=854x480[v1];[v1]setdar=16/9[clip1];[3:v:0][4:v:0]overlay[vImage];[clip0] [0:a:0] [vImage] [4:a:0][clip1] [1:a:0] concat=n=3:v=1:a=1 [v] [ao];[2:a]volume=0.5[a2];[ao] [a2] amix=duration=first [a] -map [v] -map [a] -s 854x480 -c:v libx264 -preset veryfast -vb 2000k -r 30 -g 60 -vbsf h264_mp4toannexb -strict experimental -c:a aac -b:a 128k -f mp4 ./public/tmp/output.mp4