添加音频（带偏移）与FFMPEG视频 [英] Add audio (with an offset) to video with FFMPEG

问题描述

我有10分钟的视频，并有50分钟的音频MP3。
在视频开始在500秒进音频。
使用FFMPEG，我怎么可以添加音频到视频，但指定的 500秒的声抵消（让他们同步上涨）？

I have a 10 minute video and a 50 minute audio mp3. The video starts at 500 seconds into the audio. Using FFMPEG, how can I add the the audio to the video but specify a 500 seconds audio offset (So that they sync up)?

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沿着这页面它表明如何指定偏移量。

Down the bottom of this page it suggests how to specify an offset.

$的ffmpeg -i VIDEO_SOURCE -itsoffet延迟-i audio_source -map 0：X -map 1：Y ......

$ ffmpeg -i video_source -itsoffet delay -i audio_source -map 0:x -map 1:y ......

然而，当我应用此，它仍然开始从一开始的声音。

However, when I apply this, it still starts the audio from the start.

感谢

推荐答案

我不能让音频正常或者对冲，以及一些搜索建议 -itsoffset 目前破。

I couldn't get audio to offset properly either, and some searching suggests that -itsoffset is currently broken.

您可以尝试并获得/编译旧版本的ffmpeg它打破了之前（这听起来并不像很多的乐趣）。

You could try and get/compile an old version of ffmpeg before it broke (which doesn't sound like much fun).

另外，还可以使用类似袜然后再结合必要的宁静垫音频：

Alternately, you could pad your audio with the necessary silence using something like sox and then combine:

sox -null silence.mp3 trim 0 500    # use -r to adjust sample-rate if necessary
sox silence.mp3 input.mp3 padded_input.mp3
ffmpeg -i in.avi -i padded_input.mp3 out.avi

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