问题描述
我们需要将大型实时 WMV 视频源分成大小相同的小块.我们制作了一个可以很好地执行此操作的脚本，除了一件事:视频块不以关键帧开头，因此在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出现到达.
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让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?
这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: est.wmv" -ss 00:00:00 -t 00:00:05 -acodec copy -vcodec copy -async 1 -y "0000.wmv"
ffmpeg.exe -i "C: est.wmv" -ss 00:00:05 -t 00:00:05 -acodec copy -vcodec copy -async 1 -y "0001.wmv"
等等...
推荐答案
FFMPEG 的最新版本包括一个新选项segment"，它完全符合我的想法.
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
这会生成一系列编号的输出文件，这些文件根据关键帧分成多个段.在我自己的测试中，它运行良好，尽管我没有使用它超过几分钟，而且只使用 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.
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