Remove -c copy if you want the audio to be re-encoded. This copies the audio and does not re-encode it. -map 0:a selects all audio streams only.This puts all audio into one file: ffmpeg -i input.mov -map 0:a -c copy output.mov Issue your command and wait for the output file (or troubleshoot any errors).cd (the change directory command) to the directory with the ffmeg.exe, as depicted.Open a Command Prompt (Start > Run > CMD) or on a Mac/Linux open a Terminal.You can use the -to option instead of the -t option, if you want to specify the range, eg for 45 seconds: 00:03:05 + 45 = 00:03:50 If you don't specify the -t option it will go to the end. The timestamps need to be in HH:MM:SS.xxx format or in seconds.

If you want to extract a portion of audio from a video use the -ss option to specify the starting timestamp, and the -t option to specify the encoding duration, eg from 3 minutes and 5 seconds in for 45 seconds: ffmpeg -i sample.avi -ss 00:03:05 -t 00:00:45.0 -q:a 0 -map a sample.mp3 To encode a high quality MP3 or MP4 audio from a movie file (eg AVI, MP4, MOV, etc) or audio file (eg WAV), I find it's best to use -q:a 0 for variable bit rate and it's good practice to specify -map a to exclude video/subtitles and only grab audio: ffmpeg -i sample.avi -q:a 0 -map a sample.mp3

Ffmpeg extract audio from mp4 to mp3