ffmpeg指令中可以使用filter amix實作這個功能。
6.8 amix
Mixes multiple audio inputs into a single output.
Note that this filter only supports float samples (the amerge and pan audio filters support many formats). If the amix input has integer samples then aresample will be automatically inserted to perform the conversion to float samples.
For example
ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex amix=inputs=3:duration=first:dropout_transition=3 OUTPUT
will mix 3 input audio streams to a single output with the same duration as the first input and a dropout transition time of 3 seconds.
It accepts the following parameters:
inputs
The number of inputs. If unspecified, it defaults to 2.
duration
How to determine the end-of-stream.
longest
The duration of the longest input. (default)
shortest
The duration of the shortest input.
first
The duration of the first input.
dropout_transition
The transition time, in seconds, for volume renormalization when an input stream ends. The default value is 2 seconds.
把目前電腦播放的聲音混合到檔案中的例子（”audio=”後面是音頻裝置名，ffmpeg -f dshow -list_devices 1 -i dummy可以在win下擷取音頻裝置名)：
ffmpeg.exe -re -i 1234.mp4 -f dshow -i audio=”立體聲混音 (Realtek High Definition ” -filter_complex amix=inputs=2:duration=first:dropout_transition=0 -t 10 out.mp4 -y