ffmpeg commands

ffmpeg-commands.md

Make a timelapse from images

ffmpeg -framerate 30 -f image2 -i images_%05d.JPG -r 30 -vcodec libx264 -pix_fmt yuv420p -crf 20 output.mp4

• -framerate 30 input images at 30fps
• -f image2 process the input as images
• -i blahblahblah input
• -r 30 output 30fps
• -vcodec libx265 encode w/ h.264
• -pix_fmt yuv420p adjust color space to make players happy
• -crf 20 a slightly nicer crf (standard is 23)

Simple concat

ffmpeg -f concat -i <(printf "file '$PWD/%s'\n" ./*.MP4) -c copy concat.mp4
or…
printf "file '%s'\n" ./*.MP4 > files.txt
ffmpeg -f concat -i files.txt -c copy output

Speed-up/slow-down and adjust framerate

ffmpeg -i input.mp4 -r 60 -filter:v "setpts=0.5*PTS" output.mp4

• -r 60 desired output framerate
• setpts=0.5*PTS timestamp adjustment factor. value is ratio of old to new framerates. (e.g. 30 to 60 would be 0.5, 60 to 30 would be 2)

This handy tool helps generate the correct params