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Split a longer video into 15 second clips (and rotate it, add audio) using FFmpeg for an Instagram story
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| # I'm sure there's a simple way to do this without intermediate files but :shrug: | |
| # transpose=1 rotates 90 degrees. | |
| # fade=in:120:60 adds a fade from 4s - 5s, since it's 30fps. | |
| # the fade is placed there because later we crop the video and audio 4s: -ss 00:00:04. -shortest clips the output to the end of the video, not the whole song duration. | |
| ffmpeg -i IMG_5965.mov -vf "transpose=1,fade=in:120:60" output_rotated.mov && ffmpeg -i output_rotated.mov -i ~/Downloads/soul_vibration.mp3 -ss 00:00:04 -shortest output_audio.mov && ffmpeg -i output_audio.mov -codec copy -shortest -c copy -map 0 -segment_time 00:00:10 -f segment -reset_timestamps 1 output%03d.mov && rm output_rotated.mov output_audio.mov |
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There aren't always keyframes at exactly the right place for 15 second breaks, so I just split them into ~10 second chunks instead. Updating the gist now.