Convert video to jpg and back using ffmpeg

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

@ankurbhatia24 I see you want to understand the cause of the difference. I don't know the answer. In fact more questions come up in my head. Similar to you, I would start with color space of video vs images. Also I would have a rigorous way to measure luma difference, eg bits in files or some luma intensity definition. If you end up doing the analysis, I would be interested in the findings.