After slogging through a few LLM hallucinations, one of them (ChatGPT 4o) impressed me quite a bit and gave me a glimpse into the future of search. It found a needle-in-haystack source indicating that ffprobe consistently outputs in a standardized period for decimal notation without being influenced by the user's locale. It was a very cursory mention of ffprobe behavior in an Apple discussion forum which couldn't have been found via a Google search: https://discussions.apple.com/thread/255558546?answerId=260330140022&sortBy=rank#260330140022