Simon Willison’s Weblog

QuickTime video script to capture frames and bounding boxes. An update to an older TIL. I'm working on the write-up for my DjangoCon US talk on plugins and I found myself wanting to capture individual frames from the video in two formats: a full frame capture, and another that captured just the portion of the screen shared from my laptop.

I have a script for the former, so I got Claude to update my script to add support for one or more --box options, like this:

capture-bbox.sh ../output.mp4  --box '31,17,100,87' --box '0,0,50,50'

Open output.mp4 in QuickTime Player, run that script and then every time you hit a key in the terminal app it will capture three JPEGs from the current position in QuickTime Player - one for the whole screen and one each for the specified bounding box regions.

Those bounding box regions are percentages of the width and height of the image. I also got Claude to build me this interactive tool on top of cropperjs to help figure out those boxes:

# 14th November 2024, 7 pm / claude-artifacts, ai-assisted-programming, claude, tools, projects, ffmpeg, llms, ai, generative-ai

Mass Video Conversion Using AWS. How to use S3, SQS, EC2, ffmpeg and some Python to bulk convert videos with Amazon Web Services.

# 3rd April 2007, 11:44 pm / aws, amazon, python, s3, sqs, ec2, ffmpeg