How can I create a 30 second GIF from a long random video?

Solution 1:

Steps:

1. Get duration with ffprobe.
2. Use duration as a value in the select filter.
3. Create gif.
4. Script everything.

Example script:

#!/bin/bash
mkdir 30gif
for f in *.mp4; do
  duration=$(ffprobe -loglevel error -show_entries format=duration -of default=nk=1:nw=1 "$f")
  ffmpeg -i "$f" -filter_complex "[0:v]select='lt(mod(t,${duration}/10),3)',setpts=N/(FRAME_RATE*TB),scale=560:340:force_original_aspect_ratio=decrease,pad=560:340:(ow-iw)/2:(oh-ih)/2,setsar=1,split[v0][v1];[v0]palettegen[p];[v1][p]paletteuse[v]" -map "[v]" "30gif/${f%.mp4}.gif"
done

This fulfills your many requirements:

• Output 30 second GIF comprising of 3 second segments equally spanning input duration
• 560x340 output size
• One (ffmpeg) command
• Using a bash for loop so you can automatically convert hundreds of videos
• Output name is same as input name but with .mp4 replaced with .gif