ffmpeg命令中可以使用filter amix實現這個功能。
官方文檔
http://ffmpeg.org/ffmpeg-filters.html
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.
例子
把當前電腦播放的聲音混合到文件中的例子（”audio=”后面是音頻設備名，ffmpeg -f dshow -list_devices 1 -i dummy可以在win下獲取音頻設備名)：
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