FFmpeg CLI to mix two different audios in a single audio file such as mp3
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FFmpeg offers a wide range of mixers for audio and video processing. You can use the `amix` filter for audio mixing, which allows combining multiple audio streams into a single output. For video, `overlay` is commonly used to superimpose one video stream onto another, while `blend` enables mixing two video streams with configurable transparency levels. These are just some examples, and FFmpeg provides many other options for mixing audio and video based on your specific needs. 
 

To mix different audio tracks into a single audio stream with ffmpeg, you can use the -filter_complex option along with the amix filter, which allows you to combine multiple audio inputs into one output. Here’s a simple command to do it:

ffmpeg -i audio1.mp3 -i audio2.mp3 -filter_complex "[0:a][1:a]amix=inputs=2:duration=longest" -c:a libmp3lame output.mp3

Explanation:

  • -i audio1.mp3 and -i audio2.mp3: Specify the input audio files.
  • -filter_complex "[0:a][1:a]amix=inputs=2:duration=longest":
    • [0:a][1:a] are the audio streams from each input.
    • amix=inputs=2: Mixes 2 audio inputs.
    • duration=longest: Ensures the output lasts as long as the longest input file. You can also use shortest to stop when the shortest input ends.
  • -c:a libmp3lame: Specifies the MP3 codec for the output.
  • output.mp3: Name of the output file.

 

Additional Options

You can adjust the mix levels by adding weights. For example, to give audio1 twice the volume of audio2:

ffmpeg -i audio1.mp3 -i audio2.mp3 -filter_complex "[0:a][1:a]amix=inputs=2:duration=longest:weights='2 1'" -c:a libmp3lame output.mp3

This command will give you a single mixed audio file with balanced audio from both sources.

Tags Audio Mixing FFmpeg FFmpeg Audio Mixer FFmpeg CLI amix Facebook X
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