ffmpeg vfilters在特定的时间代码 [英] ffmpeg vfilters at specific timecodes

问题描述

我想为某些视频添加水印，但我只希望水印在视频中的某些时间码（例如开始/中间/结束）出现，并且只需几秒钟。

I want to add a watermark to some videos but I only want the watermark to appear at certain timecodes in the video (e.g. beginning / middle / end) and only for a few seconds.

我已经得到ffmpeg按照这里的说明执行水印： http://ffmpeg.arrozcru.org/forum/viewtopic.php?f=8&t=1400

I've gotten ffmpeg to do the watermarking following the directions here: http://ffmpeg.arrozcru.org/forum/viewtopic.php?f=8&t=1400

但是我可以不知道如何在不同的时间码上打开/关闭水印。
这是我用来添加水印的命令：

But I can't figure out how I can turn the watermark on/off at different timecodes. Here is the command I am using to add the watermark:

ffmpeg -i test.mpg -vf "movie=0:png:wm.png [wm];[in][wm] overlay=10:10:1 [out]" wm_test.mpg

任何建议将不胜感激！

推荐答案

仍然没有实现，听到有关计划。以前我处于这种情况，我来了一个丑陋的工作解决方案。

It's still not implemented and I haven't heard about plans for it. I was in this situation a few times before and I came with an ugly, however working solution.

只需将视频分割成几部分，例如您的视频为30秒长度不等，并且您想要每10秒部分使用不同的水印，然后将视频分为3部分，如下所示：

Simply split your video in parts, so for example your video is 30 seconds in length and you want a different watermark to each 10 seconds part, then split your video into 3 parts like this:

ffmpeg -i in.mpg -t 00:00:10 // First 10 seconds
ffmpeg -i in.mpg -ss 00:00:10 -t 00:00:10 // middle 10 seconds
ffmpeg -i in.mpg -ss 00:00:20 -t 00:00:10 // last 10 seconds.

-ss // starting position
-t  // length to process

您将拥有3部分水印，您可以简单地粘贴它们。对于mpg，您可以使用一个简单的unix CAT工具，因为mpeg格式。

After you will have 3 parts watermarked, you can simply glue them. For mpg you can use a simple unix CAT tool, because of the mpeg format.

像这样： cat part1.mpg part2.mpg part3。 mpg> whole.mpg

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