使用FFMPEG选择最接近特定时刻的关键帧 [英] Select keyframe closest to a particular instant with FFMPEG

问题描述

我有一个由一些第三方软件创建的MP4视频。我不知道关键帧是否定期进行。我已经成功地用FFMPEG提取了与第3分钟（180秒*帧/秒）相对应的视频帧。

我想要做的是将第三分钟的最近关键帧提取出来，因为通常情况下，我用当前成功的代码提取的帧是不是关键帧，因此模糊。

我知道有一种方法来提取FFMPEG中的所有关键帧，但是有一种方法来提取关键帧最接近视频中的特定时间？

非常感谢！

解决方案

您可以使用 Avidemux 查找关键帧，也称为 I-frames 。

I have an MP4 video created by some third party software. I am not aware if the keyframes are at regular intervals or not. I have been successful in extracting a video frame corresponding to the 3rd minute (180 seconds * frames/s) with FFMPEG.

What I want to do is extract the "closest" keyframe to the third minute - since it is often the case that the frame that I extract with the currently successful code is NOT a keyframe and therefore blurry.

I know there is a way to extract all keyframes in FFMPEG, but is there a way to extract the keyframe closest to a particular time in a video?

Thanks very much!

解决方案

You can use Avidemux to find the keyframes, also known as I-frames.

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