Guide #3

Extract audio with FFmpeg

Audio extraction can be lossless when you copy the original stream, or normalized for broad use when you encode to MP3, AAC, or WAV.

Copy + paste this:

Create a compact audio file from a video.

ffmpeg -i input -vn -c:a libmp3lame -b:a 192k audio.mp3

When this is the right tool

Start by checking whether this operation matches the job you actually need.

Use this when

3 Good fit

You need audio for transcription, podcasts, previews, or moderation.
A video upload contains the source sound you need to process separately.
You need WAV for analysis or MP3/AAC for distribution.

Be careful when

2 Watch out

The video has multiple audio tracks and you have not picked the right one.
You need subtitles or metadata, not audio media.

Examples

Use these as starting points, then tune quality, size, and timing on real input files.

Extract MP3

Create a compact audio file from a video.

ffmpeg -i input -vn -c:a libmp3lame -b:a 192k audio.mp3

Command breakdown

input input: Reads this input file.
-vn: Drops video from the output.
-c:a libmp3lame: Sets the audio codec.
-b:a 192k: Sets the audio bitrate.
output audio.mp3: Writes this output file.

Extract WAV

Create a simple PCM WAV file for transcription or analysis.

ffmpeg -i input -vn -ac 1 -ar 16000 -c:a pcm_s16le audio.wav

Command breakdown

input input: Reads this input file.
-vn: Drops video from the output.
-ac 1: Sets the number of audio channels.
-ar 16000: Sets the audio sample rate.
-c:a pcm_s16le: Sets the audio codec.
output audio.wav: Writes this output file.

Helpful tips

These details prevent most bad outputs and confusing FFmpeg results.

Copy if the source codec is useful

`-vn -c:a copy` is fast and avoids quality loss, but the output extension must match the codec.

Use WAV for analysis

WAV is large, but simple for speech tools and signal processing.

Use MP3 or AAC for delivery

MP3 is widely accepted. AAC is common when the output stays near video workflows.

Related guides

Useful next steps when this operation is part of a larger workflow.

Trim video with FFmpeg

Learn FFmpeg trimming with fast stream-copy cuts, accurate re-encoded cuts, and timestamp basics.

Convert video format with FFmpeg

Learn how to convert MOV, MKV, WebM, and AVI files to MP4 with FFmpeg, when to copy streams, and when to re-encode.

Need to run this at scale?

Run the same FFmpeg commands through a hosted API.

Keep the FFmpeg command surface. Very Good FFmpeg handles machines, logs, long jobs, outputs, and webhooks.

Try free Read API docs

Guide #3

Extract audio with FFmpeg

Audio extraction can be lossless when you copy the original stream, or normalized for broad use when you encode to MP3, AAC, or WAV.

Copy + paste this:

Create a compact audio file from a video.

ffmpeg -i input -vn -c:a libmp3lame -b:a 192k audio.mp3

When this is the right tool

Start by checking whether this operation matches the job you actually need.

Use this when

3 Good fit

You need audio for transcription, podcasts, previews, or moderation.
A video upload contains the source sound you need to process separately.
You need WAV for analysis or MP3/AAC for distribution.

Be careful when

2 Watch out

The video has multiple audio tracks and you have not picked the right one.
You need subtitles or metadata, not audio media.

Examples

Use these as starting points, then tune quality, size, and timing on real input files.

Extract MP3

Create a compact audio file from a video.

ffmpeg -i input -vn -c:a libmp3lame -b:a 192k audio.mp3

Command breakdown

input input: Reads this input file.
-vn: Drops video from the output.
-c:a libmp3lame: Sets the audio codec.
-b:a 192k: Sets the audio bitrate.
output audio.mp3: Writes this output file.

Extract WAV

Create a simple PCM WAV file for transcription or analysis.

ffmpeg -i input -vn -ac 1 -ar 16000 -c:a pcm_s16le audio.wav

Command breakdown

input input: Reads this input file.
-vn: Drops video from the output.
-ac 1: Sets the number of audio channels.
-ar 16000: Sets the audio sample rate.
-c:a pcm_s16le: Sets the audio codec.
output audio.wav: Writes this output file.

Helpful tips

These details prevent most bad outputs and confusing FFmpeg results.

Copy if the source codec is useful

`-vn -c:a copy` is fast and avoids quality loss, but the output extension must match the codec.

Use WAV for analysis

WAV is large, but simple for speech tools and signal processing.

Use MP3 or AAC for delivery

MP3 is widely accepted. AAC is common when the output stays near video workflows.

Related guides

Useful next steps when this operation is part of a larger workflow.

Trim video with FFmpeg

Learn FFmpeg trimming with fast stream-copy cuts, accurate re-encoded cuts, and timestamp basics.

Convert video format with FFmpeg

Learn how to convert MOV, MKV, WebM, and AVI files to MP4 with FFmpeg, when to copy streams, and when to re-encode.

Need to run this at scale?

Run the same FFmpeg commands through a hosted API.

Keep the FFmpeg command surface. Very Good FFmpeg handles machines, logs, long jobs, outputs, and webhooks.

Try free Read API docs