Handy FFMPEG Commands for Quickly Processing GoPro Videos

ffmpeg_commands.txt

1) Concatenate a list of videos into one

ffmpeg -f concat -safe 0 -i tojoin.txt -c copy output.mp4

// Format of tojoin.txt:
file 'file0.MP4'
file 'file1.MP4'
file 'etc..

2) Scale down 4k video to

// 2.7k / 2704p
ffmpeg -i output.mp4 -vf scale=2704:1520 -c:v libx264 -crf 20 -preset slow smaller_2704p.mp4

// 1440p
ffmpeg -i output.mp4 -vf scale=1920:1440 -c:v libx264 -crf 20 -preset slow smaller_1440p.mp4

// 1080p
ffmpeg -i output.mp4 -vf scale=1920:1080 -c:v libx264 -crf 20 -preset slow smaller_1080p.mp4

// 720p
ffmpeg -i output.mp4 -vf scale=1280:720 -c:v libx264 -crf 20 -preset slow smaller_720p.mp4