dokuwiki

This is an old revision of the document!

---

tl;dr

ffmpeg -i input.mp4 -vf scale=320:240,setsar=1:1 output.mp4

variables

ffmpeg -i input.jpg -vf scale=iw*2:ih input_double_width.png

(works on images btw)

fit a rectangle, with padding

ffmpeg -i input.jpg -vf “scale=320:240:force_original_aspect_ratio=decrease,pad=320:240:(ow-iw)/2:(oh-ih)/2” output_320_padding.png

text over video, found in ancient text file (might not work)

ffmpeg -i ordeal.mkv -ss 55 -t 5 -vf drawtext=“textfile=slap.txt: fontcolor=white: fontsize=96: x=(w-text_w)/2: y=(h-text_h)/2” out1.mp4; ffmpeg -i out1.mp4 -vf scale=320:180 out2.gif

strip audio

ffmpeg -i footage_with_adamvoice.MOV -an footage.mp4