FFmpeg

transcode.sh

## sound
ffmpeg -y -i input.mp4 -f mp4 -acodec libfdk_aac -ar 44100 -b:a 64k -ac 2 -profile:a aac_he -afterburner 1 -vn  output.m4a

## mp4 video
ffmpeg -y -i input.mp4 -f mp4 -vcodec libx264 -acodec libfdk_aac -s 1280x720 -b:v 3000k -r 29.97 -pix_fmt yuv420p -b:a 128k -ar 44100 -ac 2 -aspect 1280:720 output.mp4 

## sprite animation webp / jpg
ffmpeg -loglevel verbose -i input.mp4 -s 400x400 -r 12 -crf 0 -b:v 100000k -an -f mpegts - 2>"ffmpeglog" |\
  ffmpeg -i - -vcodec libwebp -vf tile=4x7 -qscale:v 60 "out/%05d.webp" 2>/dev/null

ffmpeg -loglevel verbose -i input.mp4 -s 400x400 -r 12 -crf 0 -b:v 100000k -an -f mpegts - 2>"ffmpeglog" |\
  ffmpeg -i - -vcodec mjpeg -vf tile=4x7 -qscale:v 5 "out/%05d.jpg" 2>/dev/null