ffmpeg:多个filter_complex链，重新使用中间输出流 [英] ffmpeg: chain of multiple filter_complex, re-using intermediate output stream

问题描述

如何依次应用两个filter_complex命令?

How can I apply two filter_complex commands sequentially?

首先，我想将视频与图像融合 然后我要获取该过滤器的输出并将其分成4个图块，如这篇文章所述

first, I want to blend a video with an image then I want to take the output of that filter and split it into 4 tiles, as described in this post Stackoverflow.

我已经尝试过了: (我的策略是从filter_complex [int]生成中间输出，我想将该输出重复使用两次.

I have tried this: (my strategy was to generate an intermediate output from filter_complex [int] and I wanted to re-use that output twice.

ffmpeg.exe 
-i videoIn.avi 
-i imageIn.avi 
-filter_complex "[1:0] setsar=sar=1 [1sared];[0:0][1sared]blend=all_mode='divide':repeatlast=1[int];
[int]crop=960:960:24:1055:[out1];
[int]crop=960:960:1056:1062:[out2]" 
-map [out1] out1.avi 
-map [out2] out2.avi

但是，我遇到一个错误: 过滤器描述中的流说明符'int'[int] crop = 960:960:24:1055 [out1]; [int] crop = 960:960:1056:1062:[out2]匹配任何流

however, I am getting an error: Stream specifier 'int' in filtergraph description [int]crop=960:960:24:1055[out1];[int]crop=960:960:1056:1062:[out2] matches no streams

如果我仅使用一个裁剪操作但不使用两个裁剪操作，则此代码有效-因此，我猜想中间流[int]无法以我尝试的方式重复使用?

this code works if I only use one crop operation but not with two - so I am guessing the intermediate stream [int] cannot be re-used the way I am trying to do it?

如何为后续过滤器多次重复使用中间流?

how can I re-use the intermediate stream multiple times for subsequent filters?

推荐答案

您必须使用 split 过滤器以复制输入流.

You have to use the split filter to duplicate the input stream.

示例:

[...] split [crop1][crop2];
[crop1] crop=960:960:24:1055 [out1];
[crop2] crop=960:960:1056:1062 [out2]

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