如何使用FFMPEG分割视频，以便每个块以关键帧开始？ [英] How to split a video using FFMPEG so that each chunk starts with a key frame?

问题描述

我们需要以大小相同的小块拆分大型实时WMV视频馈送。我们制作了一个很好的脚本，除了一件事情外，视频块不是以关键帧开始，所以当播放大多数视频块时，它们不会显示任何图像，直到原始视频的关键帧最终

We need to split a large live WMV video feed in small chunks all of the same size. We made a script that works fine doing this, except for one thing: the video chunks don't start with a key frame, so when playing most video chunks they don't display any image until a key frame from the original video is eventually reached.

有没有办法告诉ffmpeg使输出视频从关键帧开始？

Isn't there a way to tell ffmpeg to make the output video to start with a key frame?

以下是我们的命令行现在的样子：

Here is how our command lines look right now:

ffmpeg.exe -i "C:\test.wmv" -ss 00:00:00 -t 00:00:05 -acodec copy -vcodec copy -async 1 -y  "0000.wmv"
ffmpeg.exe -i "C:\test.wmv" -ss 00:00:05 -t 00:00:05 -acodec copy -vcodec copy -async 1 -y  "0001.wmv"

等等...

推荐答案

最新版本的FFMPEG包括一个新的选项 这完全符合我的想法。

The latest builds of FFMPEG include a new option "segment" which does exactly what I think you need.

ffmpeg -i INPUT.mp4 -acodec copy -f segment -vcodec copy -reset_timestamps 1 - map 0 OUTPUT％d.mp4

这产生了一系列编号的输出文件，它们根据关键帧分成段。在我自己的测试中，它运行良好，虽然我没有使用任何时间超过几分钟，只有MP4格式。

This produces a series of numbered output files which are split into segments based on Key Frames. In my own testing, it's worked well, although I haven't used it on anything longer than a few minutes and only in MP4 format.

这篇关于如何使用FFMPEG分割视频，以便每个块以关键帧开始？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！