使用ffmpeg剪切视频的多个部分 [英] Cut multiple parts of a video with ffmpeg

问题描述

在我要执行的操作中，我需要删除视频文件的某些部分，然后从中创建一个新文件.

In what I'm trying to do, I need to remove some parts of a video file, and create a new one from that.

例如，来自这样的视频文件:

For example, from a video file like this:

===================

我砍了两遍

======||=====||||==

并生成一个新的较小的视频文件:

and generate a new smaller video file:

=============

当我说2时，我指的是任意数量的单独剪切，具体取决于视频文件.

And when I say 2, I mean an arbitrary number of separate cuts, depending on the video file.

如果我只想切割一部分，我会做:

If I wanted to cut just one part I would do:

ffmpeg -i video.mp4 -ss 00:00:03.500 -to 00:00:08.500 -async 1 cut.mp4 -y

哪个效果很好.我也许可以这样做很多次，然后将所有片段合并在一起……但是对于较大的视频文件，这是非常低效的.

Which works perfectly. I could perhaps do this many times and then join all the cuts together... But this is very inefficient for larger video files.

要进行两次切割，我查看了 filter_complex .我一直在努力使其正确运行几个小时，但似乎无法正常工作:/

To make two cuts I was looking at filter_complex. I've been trying to get it right for hours but I can't seem to get this working :/

如果我做这样的事情，我会得到没有音频的视频:

If I do something like this I get a video with no audio:

command='ffmpeg -i video.mp4
                -filter_complex "[0]trim=start_frame=10:end_frame=20[v0];
                                 [0]trim=start_frame=30:end_frame=40[v1];
                                 [v0][v1]concat=n=2[v5]"
                -map [v5] -async 1 output.mp4'

如果我尝试这样做，事情就会一团糟:

If I try to do this, things get all messed up:

ffmpeg -y -i video.mp4 
       -filter_complex "[0:v]trim=start_frame=10:end_frame=20[v0];
                        [0:a]atrim=start=10:end=20[a0];
                        [0:v]trim=start_frame=30:end_frame=40[v1];
                        [0:a]atrim=start=30:end=40[a1];
                        [v0][a0][v1][a1]concat=2:v=1:a=1[v5][a]" \
       -map [v5] -map [a] -async 1 output.mp4

我什至尝试使用 ffmpeg-python 在Python中做到这一点 https://github.com/kkroening/ffmpeg-python ，但我也无法使音频正常工作.

I even trying to to this in Python with ffmpeg-python https://github.com/kkroening/ffmpeg-python but I also can't get audio to work.

有人可以在这方面给我一些帮助吗? 非常感谢！！

Can anyone give me some help on this? Thank you very much!!

推荐答案

选择过滤器对此效果更好.

The select filter is better for this.

ffmpeg -i video \
       -vf "select='between(t,4,6.5)+between(t,17,26)+between(t,74,91)',
            setpts=N/FRAME_RATE/TB" \
       -af "aselect='between(t,4,6.5)+between(t,17,26)+between(t,74,91)',
            asetpts=N/SR/TB" out.mp4

select及其对应的过滤器分别应用于视频和音频.选择的段是时间4到6.5秒，17到26秒，最后是74到91秒.时间戳与设置点及其对应的过滤器连续.

select and its counterpart filter is applied to the video and audio respectively. Segments selected are times 4 to 6.5 seconds, 17 to 26 seconds and finally 74 to 91 seconds. The timestamps are made continuous with the setpts and its counterpart filter..

这篇关于使用ffmpeg剪切视频的多个部分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！