I came across an interesting blog post by Alex Chen on how to write better image descriptions for web pages. They propose an “object-action-context” approach when writing image descriptions. I see that such an approach could also be helpful for my sound actions project. Adding better descriptions I am soon getting to the end of my year-long project of recording one sound action daily. A sound action is a multimodal entity consisting of body motion and its resultant sound.

I have previously written about how to export each of the pages of a PDF file as an image. That works well for, for example, presentation slides that should go on a web page. But sometimes there is a need to export only the images within a page. This can be achieved with a small command line tool called pdfimages. One way of using it is: pdfimages -p -png file.pdf image This will export all images in file.

I often have to convert between different resolutions of videos and images and always forget the pixel dimensions that correspond to a 16:9 format. So here is a cheat-sheet: **2160p: **3840×2160 **1440p: **2560×1440 **1080p: **1920×1080 **720p: **1280×720 540p: 960x540 **480p: **854×480 **360p: **640×360 **240p: **426×240 120p: 213x120 I also came across this complete list of true 16:9 resolution combinations, but the ones above suffice for my usage. Happy converting!

I take a lot of timelapse shots with a GoPro camera. Usually, I do this with the camera’s photo setting instead of the video setting. That is because I find it easier to delete unwanted pictures from the series that way. It also simplifies selecting individual photos when I want that. But then I need a way to create a timelapse video from the photos easily. Here is an FFmpeg one-liner that does the job: