Key takeaways
- Most MP4 files carry AAC audio. You can copy it out into an M4A file with no re-encoding and no quality loss.
- Converting to MP3 re-encodes the sound, which is lossy. It is worth it only when a device or service insists on MP3.
- VLC (free, graphical) and ffmpeg (free, command line) both do the job in under a minute.
- Only extract audio from videos you own or have permission to use.
Sometimes you only need the sound: a lecture to listen to on a walk, a voice memo recorded as video, a podcast clip, a song you made. A video file contains the audio as a separate stream alongside the picture, so taking it out is straightforward. The one decision that matters is whether to copy the audio untouched or convert it to a new format.
First, find out what audio is inside
Different MP4 files hold different audio codecs. The most common is AAC. You can check with VLC by opening the file and choosing Tools > Codec Information, or with ffprobe:
ffprobe -v error -select_streams a -show_entries stream=codec_name,sample_rate,channels,bit_rate -of default=nw=1 input.mp4If the output says codec_name=aac, you can copy the audio out losslessly. For more ways to read a file's details, see how to check a video's resolution, bitrate and codec.
Copy or convert? A quick comparison
| Output | Quality | Best when |
|---|---|---|
| M4A (copy of AAC) | Identical to the original audio | You want the best quality and your device plays M4A (nearly all modern ones do) |
| MP3 | Slight loss from re-encoding | An old player, car stereo or service requires MP3 |
| WAV | Uncompressed (decoded from the source) | You will edit the audio in a studio tool; files are large |
Going from a compressed format (AAC) to another compressed format (MP3) means the sound is compressed twice, so some detail is lost. At a high setting the difference is hard to hear, but if you can avoid it, do.
Method 1: VLC (no commands)
- Install VLC and open it.
- Choose Media > Convert / Save (on Mac, File > Convert / Stream).
- Click Add, pick your MP4, then click Convert / Save.
- Under Profile, choose Audio - MP3 (or an AAC or FLAC option if your version lists one).
- Click Browse, choose a destination and give the file a name ending in .mp3.
- Click Start. A short clip finishes in seconds.
VLC always re-encodes with this method, so it is the simplest route to MP3 rather than a lossless route.
Method 2: ffmpeg, lossless copy to M4A
If the audio is AAC, this takes the audio out with no re-encoding at all:
ffmpeg -i input.mp4 -vn -c:a copy output.m4a-vn means "no video" and -c:a copy means "copy the audio as it is." The result is bit-for-bit the same sound, finishes almost instantly and is the best quality you can get.
Method 3: ffmpeg, convert to MP3
ffmpeg -i input.mp4 -vn -c:a libmp3lame -q:a 2 output.mp3The -q:a 2 setting is a high-quality variable bitrate (roughly 170 to 210 kbps). Use -q:a 0 for the highest quality, or -b:a 128k for a fixed, smaller bitrate that suits speech.
Useful extras
Take only part of the audio
Combine extraction with a start time and duration. This example takes 30 seconds starting at 1 minute 15 seconds:
ffmpeg -ss 00:01:15 -i input.mp4 -t 30 -vn -c:a libmp3lame -q:a 2 clip.mp3Add a title and artist
ffmpeg -i input.mp4 -vn -c:a copy -metadata title="Episode 12" -metadata artist="Your Name" output.m4aMake quiet speech louder
Speech recorded on a phone is often too quiet. A gentle loudness normalisation helps, but it requires re-encoding:
ffmpeg -i input.mp4 -vn -af loudnorm -c:a libmp3lame -q:a 2 output.mp3If there is no sound in the output
If the file you create is silent or tiny, the source probably has no audio stream. Screen recorders often capture only video unless you switch audio capture on. Open the original in VLC, choose Tools > Codec Information and look for a stream labelled Audio. If there is none, the recording never captured sound, and no tool can recover it.
Where this fits with downloaded clips
If you saved a Streamable clip with our downloader, you have an MP4 with the audio embedded, and any method above works. Our downloader delivers the MP4 only and does not convert to MP3, because the best approach is to keep the original file and extract audio locally where you control the quality.
Rights and permission
Pulling audio out of a video is technically simple and legally the same as copying the video. If the recording is yours, or you have permission, you are fine. Music, podcasts, interviews and other people's performances are usually protected, and extracting or sharing the audio may need a licence. Read our copyright and permission basics before you publish anything you did not create.
Quick answers
Does extracting audio reduce quality?
Copying the audio stream to M4A does not. Converting to MP3 re-encodes it and loses a small amount of detail, which is usually inaudible at high bitrates.
Which is better, MP3 or M4A?
At the same bitrate, AAC (M4A) generally sounds as good or better than MP3. MP3 is more universally compatible with older equipment.
Can I get audio from a video on my phone?
Yes. Several free apps and the built-in tools on some phones can export audio. For full control and no uploads, copy the file to a computer and use VLC or ffmpeg as above.
Need to save a Streamable clip? Paste its link into the free Streamable downloader and get the original MP4 in a few seconds. Only download videos you own or have permission to keep: see our copyright basics guide.