Answers for "how to convert mp4 to mp3 ffmpeg"

ffmpeg video to mp3

ffmpeg -i "file.mkv" -vn -ar 44100 -ac 2 -ab 128k -f mp3 "file.mp3"

mp4 to ffmpeg

#MP4 - 1080p:
ffmpeg -i input.mov -preset slow -codec:a libfdk_aac -b:a 128k -codec:v libx264 -pix_fmt yuv420p -b:v 4500k -minrate 4500k -maxrate 9000k -bufsize 9000k -vf scale=-1:1080 output.mp4

#MP4 - 720p:
ffmpeg -i input.mov -preset slow -codec:a libfdk_aac -b:a 128k -codec:v libx264 -pix_fmt yuv420p -b:v 2500k -minrate 1500k -maxrate 4000k -bufsize 5000k -vf scale=-1:720 output.mp4

#MP4 - 480p:
ffmpeg -i input.mov -preset slow -codec:a libfdk_aac -b:a 128k -codec:v libx264 -pix_fmt yuv420p -b:v 1000k -minrate 500k -maxrate 2000k -bufsize 2000k -vf scale=854:480 output.mp4

#MP4 - 360p:
ffmpeg -i input.mov -preset slow -codec:a libfdk_aac -b:a 128k -codec:v libx264 -pix_fmt yuv420p -b:v 750k -minrate 400k -maxrate 1000k -bufsize 1500k -vf scale=-1:360 output.mp4

ffmpeg m4a to mp3

ffmpeg -i input.m4a -c:a libmp3lame -q:a 8 output.mp3