The param name 'unsafe' implies that maybe I should trust it only under certain conditions. So, how can I concatenate different videos while maintaining the original quality and aspect ratio?īonus: Is something wrong with using unsafe=1?. The only issue is that some videos stretch. I'm using unsafe=1 which works almost perfect. I've tried the following FFmpeg command: ffmpeg -i 1.mp4 -i 2.mp4 -y -filter_complex " concat=unsafe=1:n=2:v=1:a=1 " -map "" -map "" out.mp4 Is it possible to concatenate many videos with different aspect ratio? So in the end every video segment maintains the original aspect ratio.
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