December 09, 2012

Webcam timelapse – Friday 7th December 2012.

Friday 7th December 2012 as seen through the University webcam in approximately 2.3 minutes.

Images were grabbed at a rate of one per minute, which in theory gives a total of 1440 images. There's actually only 1420 as 20 images scattered throughout the day didn't get saved for whatever reason. Video is constructed using 10 images per second. Total run time should be 142 seconds. According to ffmpeg the actual length of the generated video is 00:02:21.90. Don't know why.

I just occured to me that the video isn't optimised for streaming so it all needs to download before you can start to watch it. There's something in ffmpeg to do such optimisation apparently so I should look in to that at some point.

Coming soon, versions that cover a week, a month and a year. Maybe. And for varying values of soon. Imagine how long it could take to get a year's worth of images! Obviously wouldn't be able to get a consistent one image per minute for an entire year, that's obvious just from the 20 missing images in a single day. It'd be an exercise in maintaining uptime really. Or having more than one machine grabbing the images. By my calculations a year's worth of images would be about 11GB. A video created using 10 images per second would be over two days long.

- One comment Not publicly viewable

  1. Steve Rumsby

    “the actual length of the generated video is 00:02:21.90. Don’t know why.”

    You’ve just discovered fencepost, or “off by one” errors:-)

    10 Dec 2012, 09:33

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