How to convert an image (.jpg/.png) to a video (.mp4) compatible with the TikTok website, using ffmpeg and linux ? The website uploader does not support images directly.

Here’s a command-line that will do the trick, re-scaling the image to the vertical aspect ratio required by TikTok:

export FNAME="MyPicture.jpg" && export DURATION=25 && ffmpeg -loop 1 -i $FNAME  -c:v libx264 -t $DURATION -pix_fmt yuv420p -vf scale=1080:1280 $FNAME.tiktok.mp4

You can adjust the duration (25s in the example) and the output resolution (1080:1280).