ffmpeg：如何将 vstack 与 _filter_complex 中的其他选项链接起来
我正在使用 RTSP 输入流并将其分成两个相同的。在第一个上我只做了缩放，在第二个上我也做了缩放和特写。因此，两个流 [a] 和 [b] 具有相同的尺寸：
-filter_complex "[0:v]split=2[in1][in2];[in1]scale=800:600[a];[in2]crop=640:360:700:500,scale=800:600[b]" \
不，我正在尝试从 [a] 和 [b] 创建一个名为 [c] 的流，将两者堆叠在一起：
-filter_complex "[0:v]split=2[in1][in2];[in1]scale=800:600[a];[in2]crop=640:360:700:500,scale=800:600[b];[a][b]vstack=inputs=2[c]" \
当第一个有效时，我得到第二个错误消息如下：
Output with label 'a' does not exist in any defined filter graph, or was already used elsewhere.
如何将操作链接到我可以映射第三个流并使用它进行处理
-map "[a]"
-map "[b]"
-map "[c]"
I am using an RTSP input stream and divide it in two identical. On the first one I just do a scaling, on the second one I do a scaling and a close up as well. So both streams [a] and [b] have the same dimensions aferwards:
-filter_complex "[0:v]split=2[in1][in2];[in1]scale=800:600[a];[in2]crop=640:360:700:500,scale=800:600[b]" \
No I am trying to create a stream from [a] and [b] called [c] to stack both together:
-filter_complex "[0:v]split=2[in1][in2];[in1]scale=800:600[a];[in2]crop=640:360:700:500,scale=800:600[b];[a][b]vstack=inputs=2[c]" \
While the first one works, I get the following error message for the second one:
Output with label 'a' does not exist in any defined filter graph, or was already used elsewhere.
How can I chain the operations to that I can map a third stream an process it with
-map "[a]"
-map "[b]"
-map "[c]"
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@kesh：谢谢！
我这样修改它并且有效：
@kesh: Thanks!
I modified it like this and it works: