如何使用ffmpeg重叠和合并多个音频文件? [英] How to overlap and merge multiple audio files using ffmpeg?

问题描述

我正在尝试将多个音频文件合并到一个文件中，而不是使用以下命令将其合并:

I am trying to merge multiple audio files into a single file but instead of concatenating which I can do using the following command:

ffmpeg -v debug -i file1.wav -i file2.wav -i file3.wav -filter_complex [0:0]concat=n=3:v=0:a=1[out] -map [out] output.wav

尽管此命令可以很好地进行串联，但是我想重叠一下，例如第一个文件末尾的最后100ms和下一个文件开始的100ms.

Though this command works fine for concatenating, I want to overlap let's say the last 100ms of the end of the first file and 100ms of the start of the next file.

我现在正在尝试使用ffmpeg提供的'acrossfade'过滤器，但是我没有成功.

I am now trying to use 'acrossfade' filter that ffmpeg provides but I am not having any success with it.

ffmpeg -v debug -i file1.wav -i file2.wav -i file3.wav -filter_complex [0:a]acrossfade=d=0.100:c1=exp:c2=exp,[1:a]acrossfade=d=0.100:c1=exp:c2=exp,[2:a]acrossfade=d=0.100:c1=exp:c2=exp

这是我到目前为止提出的内容，但是由于它抛出"对于frame_length = 1的缓冲区太短(n = 0)"而无法正常工作.

This is what I have come up till now, but does not work as it throws 'Buffer is too short (n=0) for frame_length=1' error.

文档不是很有帮助，有人知道该怎么做吗?

The documentation is not very helpful, does anyone have any idea what can be done?

提前谢谢！

推荐答案

acrossfade旨在在两个输入之间创建过渡.因此，每对输入都必须应用交叉淡入淡出功能，并将结果用作下一个交叉淡入淡出的输入.

acrossfade is meant to create a transition between two inputs. So, each pair of inputs has to have acrossfade applied with the result being used as an input for the next acrossfade.

ffmpeg -v debug -i file1.wav -i file2.wav -i file3.wav -filter_complex "[0:a][1:a]acrossfade=d=0.100:c1=exp:c2=exp[a01];[a01][2:a]acrossfade=d=0.100:c1=exp:c2=exp" out.wav

编辑:您的输入为16000 Hz，淡入淡出持续时间为0.1s(！)，以输入采样率小于2个音频帧.默认帧大小为1024个样本.因此，需要减小框架尺寸.

Edit: your inputs are 16000 Hz, and your crossfade duration is 0.1s (!), which is less than 2 audio frames at the input sampling rate. Default frame size is 1024 samples. So, frame size needs to be lowered.

ffmpeg -v debug -i file1.wav -i file2.wav -i file3.wav -filter_complex "[0:a]asetnsamples=256[0a];[1:a]asetnsamples=256[1a];[2:a]asetnsamples=256[2a];[0a][1a]acrossfade=d=0.100:c1=exp:c2=exp[a01];[a01][2a]acrossfade=d=0.100:c1=exp:c2=exp" out.wav

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