ffmpeg-scripts

Collection of snippets using ffmpeg to create presnation and mix videos

Audio

Add sound to video

ffmpeg -i input.mp4 -i audio2.mp3 -to 00:02:30 -c:v copy -c:a aac -strict experimental output.mp4

Extract Audio from video

https://gist.github.com/protrolium/e0dbd4bb0f1a396fcb55#extract-audio

ffmpeg -i video.mp4 -f mp3 -ab 192000 -vn music.mp3

Video Rotation

https://stackoverflow.com/a/9570992/1279318

ffmpeg -i input.mp4 -vf "transpose=1" output.mp4

• 0 = 90CounterCLockwise and Vertical Flip (default)
• 1 = 90Clockwise
• 2 = 90CounterClockwise
• 3 = 90Clockwise and Vertical Flip
• -vf "transpose=2,transpose=2" for 180 degrees

Concat Videos

https://stackoverflow.com/a/11175851/1279318

rm -f list.txt
for file_name in *.mp4; do
    echo "file '$file_name'" >> list.txt
done
ffmpeg -f concat -i list.txt output.mp4

Video grid

https://stackoverflow.com/a/33764934/1279318

2 X 2 grid

ffmpeg -i input0.mp4 -i input1.mp4 -i input2.mp4 -i input3.mp4 -filter_complex \
"[0:v][1:v]hstack=inputs=2[top];[2:v][3:v]hstack=inputs=2[bottom];
[top][bottom]vstack=inputs=2[v]" -map "[v]" output.mp4

3 X 3 Grid

ffmpeg -i input0.mp4 -i input1.mp4 <...> -i input9.mp4 -to 00:00:55 -filter_complex \
"[0:v]scale=640:640[v0];[1:v]scale=640:640[v1];[2:v]scale=640:640[v2];[v0][v1][v2]hstack=inputs=3[top];
[3:v]scale=640:640[v3];[4:v]scale=640:640[v4];[5:v]scale=640:640[v5];[v3][v4][v5]hstack=inputs=3[middle];
[6:v]scale=640:640[v6];[7:v]scale=640:640[v7];[8:v]scale=640:640[v8];[v6][v7][v8]hstack=inputs=3[bottom];
[top][middle][bottom]vstack=inputs=3[v]" -map "[v]" output.mp4

Resize vidoe

crop

https://www.bugcodemaster.com/article/crop-video-using-ffmpeg

 ffmpeg -i input.mp4  -vf "crop=1024:1024" output.mp4

• crop=w:h:x:y
• in_w and in_h are image variable for width and height

trim

ffmpeg -i input.mp4  -ss HH:MM:SS.mmm -to HH:MM:SS.mmm :v copy -c:a copy output.mp4

Create video from images

https://video.stackexchange.com/a/13069

ffmpeg -framerate 30 -i image-%03d.png -c:v libx264 -pix_fmt yuv420p -crf 23 output.mp4

• -framerate is how many frames there are in a second
• image-%03d.png is files in assending order from image-000.png and up. you cannot skip a number.

Randomize images (python)

import glob, random
files = glob.glob('source/*.jpg')
random.shuffle(files)
import shutil
for idx, fn in enumerate(files):
    shutil.copy(fn, 'image-%03d.jpg' % (idx))

Rotation

See orientaion attribute

exiftool -Orientation -S source/

Remove orientaion attribute

exiftool -Orientation= source/

Rotate image

https://github.com/xiumingzhang/cheatsheets/blob/master/ffmpeg-imagemagick.md#rotate-images-in-a-folder

convert "$file" -rotate 90 "${file%.png}"_rotated.png

Image manipulation

Resize image

https://www.howtogeek.com/109369/how-to-quickly-resize-convert-modify-images-from-the-linux-terminal/

convert example.png -resize 200x100 example.png

Add background to resize images

https://unix.stackexchange.com/a/122592/279393

mogrify -gravity Center -extent 1024x1024 -background white -colorspace RGB *jpg

PDF to jpg

Include adding white background instead of transparent background

convert -background white -flatten -colorspace sRGB -density 300 input.pdf output.jpg