rlan/ffmpeg_video_jpg.md

Last active January 10, 2026 14:51

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Convert video to jpg and back using ffmpeg

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ffmpeg_video_jpg.md

Video and JPG conversion using FFMPEG

Grab one frame from video

#!/bin/sh -x
# $1 - input video file, e.g. video.mp4
# $2 - timestamp, e.g. 00:33
# $3 - output image file, e.g. output.jpg
ffmpeg -ss $2 -i $1 -vframes 1 -q:v 2 $3

Grab all frames from video

#!/bin/sh -x
# $1 - input file, e.g. input.mp4
ffmpeg -i "$1" -q:v 2 %06d.jpg

Combine jpg files into one video

ffmpeg -f image2 -framerate 30 -i %06d.jpg -c:v libx264 out.mp4

eyeandroid commented Jan 10, 2026

Thanks for the scripts!

I built a web-based tool (Video To JPG) that also uses FFmpeg, but I added a sharpness detection feature on top of it.

Instead of manually sifting through hundreds of extracted frames to find a focused shot, the tool automatically calculates a clarity score and highlights the crispest images. It’s really helpful for filtering out motion blur. Hope it helps someone looking for the "best" frame rather than just "all" frames.