ffmpeg图像到视频脚本任何人？ [英] ffmpeg images-to-video script anyone?

问题描述

我想要拍一些图像，并从中制作一个视频幻灯片。会有一个应用程序，对吧？嗯，好像好多了。问题是我希望幻灯片同步到一段音乐，而我看到的所有应用程序只允许您显示每一张幻灯片的整数倍。我想让他们显示1.714285714秒的倍数，以适应140 bpm。

我看到的工具通常似乎有ffmpeg在引擎盖下，所以大概是这种的事情可以用脚本完成。但是ffmpeg有很多选择...我希望有人会有一些关闭。

我会有多达100张幻灯片，必须显示的幻灯片对于3.428571428秒或任何我想我可以简单地显示两次。

解决方案

您可以从一个视频，或从许多
图像创建视频：

从视频中提取图像：

  ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-％03d.jpeg 
  

这将从视频中每秒提取一个视频帧，并将
在名为 foo-001.jpeg '，' foo-002.jpeg '等。图像
将被重新缩放以适应新的WxH值。如果你想提取
只有有限数量的框架，你可以使用
组合的上述命令与-vframes或-t选项，或者与-ss
组合来开始提取从某个时间点开始。从许多图像创建视频
：

  ffmpeg -f image2 -i foo-％03d.jpeg -r 12 -s WxH foo.avi 
  

语法 foo-％03d.jpeg 指定使用由零填充的三位数组成的
的十进制数来表示序列号。它
与C printf函数支持相同的语法，但只有接受正常整数的
格式是合适的。

这是文档的摘录，有关ffmpeg的文档页面的更多信息，请查看。

I'm wanting to take a bunch of images and make a video slideshow out of them. There'll be an app for that, right? Yup, quite a few it seems. The problem is I want the slides synced to a piece of music, and all the apps I've seen only allow you to show each slide for a multiple of a whole second. I want them to show for multiples of 1.714285714 seconds to fit with 140 bpm.

The tools I've seen generally seem to have ffmpeg under the hood, so presumably this kind of thing could be done with a script. But ffmpeg has sooo many options...I'm hoping someone will have something close.

I'll have up to about 100 slides, the ones that have to show for 3.428571428 secs or whatever I guess I can simply show twice.

解决方案

You can extract images from a video, or create a video from many images:

For extracting images from a video:

ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg

This will extract one video frame per second from the video and will output them in files named 'foo-001.jpeg', 'foo-002.jpeg', etc. Images will be rescaled to fit the new WxH values. If you want to extract just a limited number of frames, you can use the above command in combination with the -vframes or -t option, or in combination with -ss to start extracting from a certain point in time. For creating a video from many images:

ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi

The syntax foo-%03d.jpeg specifies to use a decimal number composed of three digits padded with zeroes to express the sequence number. It is the same syntax supported by the C printf function, but only formats accepting a normal integer are suitable.

This is an excerpt from the documentation, for more info check on the documentation page of ffmpeg.

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