How do we redirect the output of 1 ffmpeg processing as input in the same command?

Question

I want to attach 2 videos using hstack filter and this is what I am doing, resizing 1 of the video files (to match same height) and then proceeding to merge. This is happening as 2 different steps,

ffmpeg -y -i inputVideo1 -vf scale=-2:900 outputVideo1
ffmpeg -y -i outputVideo1 -i inputVideo2 -c:v libx264 -filter_complex hstack outputVideo2.mp4

This is taking longer time. How do I make this happen in a single step? Something like,

ffmpeg -i inputVideo1 (something here) outputVideo1 (take this as input) -i inputVideo2 (hstack and stuff) outputVideo2.mp4```

llogan · Accepted Answer · 2020-09-09 20:13:26Z

1

Combined command:

ffmpeg -i inputVideo1 -i inputVideo2 -c:v libx264 -filter_complex "[0:v]scale=-2:900[left];[left][1:v]hstack" outputVideo.mp4

answered Sep 9, 2020 at 20:13

llogan

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