将不同长度的音频/视频与ffmpeg混合 [英] Mix audio/video of different lengths with ffmpeg

问题描述

我想将video.mp4(持续时间为1分钟)中的视频和audio.mp3(持续时间为10分钟)中的音频混合到一个输出文件中，持续时间为1分钟.来自audio.mp3的音频应位于4分钟-5分钟的位置.如何使用ffmpeg做到这一点?

I want to mix video from video.mp4 (1 minute duration) and audio from audio.mp3 (10 minute duration) into one output file with a duration of 1 minute. The audio from audio.mp3 should be from the 4 min - 5 min position. How can I do this with ffmpeg?

推荐答案

如果video.mp4没有音频

您可以使用以下命令:

If video.mp4 has no audio

You can use this command:

ffmpeg -i video.mp4 -ss 00:04:00 -i audio.mp3 -c copy -shortest output.mkv

• 音频将按照问题的要求从4分钟位置(-ss 00:04:00)开始播放.

  • The audio will be from the 4 minute position (-ss 00:04:00) as requested in the question.

    此示例将流复制(重新混合)视频和音频-不会重新编码.

    This example will stream copy (re-mux) the video and audio–no re-encoding will happen.

    您将必须按以下说明添加-map选项: FFmpeg多路复用视频和音频(来自另一个视频)-映射问题.

    You will have to add the -map option as described here: FFmpeg mux video and audio (from another video) - mapping issue.

    添加 apad 过滤器以添加无声填充:

    Add the apad filter to add silent padding:

    ffmpeg -i video.mp4 -ss 00:04:00 -i audio.mp3 -c:v copy -af apad -shortest output.mkv
    

    请注意，过滤需要重新编码，因此在此示例中将对音频进行重新编码.

    Note that filtering requires re-encoding, so the audio will be re-encoded in this example.

    这篇关于将不同长度的音频/视频与ffmpeg混合的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！