剪切视频并将它们与hstack同时堆叠在ffmpeg中

Question

I have two videos that I want to stack with hstack. The videos are not perfectly in sync so I would like to cut a bit from the beginning of one of the videos to get them to sync perfectly. Everything works fine using two concurrent commands:

ffmpeg -ss 00:00:18 -i video1.mp4 -ss 00:00:02.000 -c:v libx264 left.mp4 

followed by

ffmpeg -i left.mp4 -i right.mp4 -filter_complex hstack output.mp4

I'm wondering however if it is possible to do the trimming at the same time as stacking so that ffmpeg doesn't have to encode the cut video twice. This would save a lot of time for me as I will be doing this cutting & merging multiple times.

I tried various ways to achieve this in one single command, but to no avail so I have to turn to the community. Thank you for helping!

Answer 1

对于普通的MP4文件，它就像

ffmpeg -ss 20 -i left.mp4 -i right.mp4 -filter_complex hstack output.mp4