https://www.youtube.com/watch?v=YMO9uUsjXaI
input data:
- 140 teeth around the wheel
- total distance = 3.86 miles
- original frame size = 367x367
Inferred speed in the video: mean = 298 Mm/s, 95% CI = [285, 310]
# download part of video
yt-dlp \
-f 248 -o "AlphaPhoenix-speedoflight-res.%(ext)s" \
--download-sections "*15:30-15:33" \
https://www.youtube.com/watch?v=YMO9uUsjXaI
yt-dlp \
-f 248 -o "AlphaPhoenix-speedoflight-full.%(ext)s" \
--download-sections "*12:37-12:42" \
https://www.youtube.com/watch?v=YMO9uUsjXaI
# grab cropped and resized frames
ffmpeg -i AlphaPhoenix-speedoflight-res.webm \
-vf "crop=958:958:926:46,scale=367:367" \
-ss 0.6 "frames/res_%03d.png"
ffmpeg -ss 2 -t 3.1 \
-i AlphaPhoenix-speedoflight-full.webm \
-vf "crop=1080:1080,scale=360:360:flags=neighbor" \
"frames/full_%03d.png"The individual photos appear a couple of times; the first set I noticed started around 15:30 and includes info that they were 367 pixels square. I then noticed full screen versions appearing at 12:37. They are presumably both the same just resampled differently, as they are both stabilised the same.