Generate karaoke video with looping background animation, audio track and ASS subtitles

generate_karaoke_vid_nvenc.fish

#!/usr/bin/env fish 

# variant of the script making use of hw acceleration with nvidia gpu

set progname "generate_karaoke_vid_nvenc.fish";
set audio_file $argv[1];
set ass_file $argv[2];
set bg_animation_file $argv[3];
set output_file $argv[4];


function help 
    echo "usage: $progname <audio> <ass> <background video> <output>"
end


function generate 
    ffmpeg -y -hwaccel cuda  -stream_loop -1 -an -i $bg_animation_file -i $audio_file -acodec copy -vf ass=$ass_file -c:v nvenc -crf 28  -shortest  $output_file
end

generate
or help

generate_karaoke_video.fish

#!/usr/bin/env fish 

set progname "generate_karaoke_vid.fish";
set audio_file $argv[1];
set ass_file $argv[2];
set bg_animation_file $argv[3];
set output_file $argv[4];


function help 
    echo "usage: $progname <audio> <ass> <background video> <output>"
end


function generate 
    # ffmpeg -y -stream_loop -1 -an -i $bg_animation_file -i $audio_file -acodec copy -vf ass=$ass_file -c:v libx265 -shortest $output_file
    ffmpeg -y -stream_loop -1 -an -i $bg_animation_file -i $audio_file -acodec copy -vf ass=$ass_file -c:v libx264 -tune animation -crf 28  -shortest $output_file
end

generate
or help

added a modified version of the script that makes use of hw acceleration for nvidia gpus