ffmpeg extract audio stream from mp4 encode mp3

If you don’t specify the -t option it will go to the end. Since mp3 cannot contain a video stream, to extract audio from the video and secretly convert it to mp3, you can use it (skip to add -vn ): ffmpeg -i myvideo.mp4 audio.mp3. 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:įfmpeg -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:įfmpeg -i sample.avi -q:a 0 -map a sample.mp3 Read the output to see what codec it is, to set the right filename extension. acodec copy says use the same audio stream that’s already in there. In this command -i Used to specify the path and file name of the input video, -vn Skip the inclusion of the video stream, and -acodec copy Used to copy the original audio (without re-encoding).To extract the audio stream without re-encoding:įfmpeg -i input-video.avi -vn -acodec copy output-audio.aac Replace myvideo.mp4 With video file name / path, and audio.ogg And the name and extension to be used for the audio output file name. Now that you know the original audio format, you can use the following methods to extract audio from the video without re-encoding:įfmpeg -i myvideo.mp4 -vn -acodec copy audio.ogg You might also like: How to download a YouTube playlist and convert it to MP3 using youtube-dl (command line) Stream #0:1(eng): Audio: vorbis, 44100 Hz, stereo, fltp (default) Remove -c copy if you want the audio to be re-encoded. This copies the audio and does not re-encode it. Duration: 00:04:19.47, start: 0.000000, bitrate: 1261 kb/s Example to extract audio stream 4: ffmpeg -i input.mkv -map 0:a:3 -c copy output.m4a -map 0:a:3 selects audio stream 4 only (ffmpeg starts counting from 0).-c copy enables stream copy mode.

Ffmpeg extract audio stream from mp4 encode mp3