Capturing a time lapse from an RTSP Stream

I was looking for a better way to capture time lapse recordings of my 3D printer, Octopi on my old raspberry Pi just wasn’t cutting it, so I decided to setup an RTSP stream as per this post here┬áby Chris Carey, that was straightforward enough, but then I needed a way to periodically grab frames from the camera as it streamed, for this, VLC came to the rescue! With a (relatively) simple command line I’m now able to grab frames and encode them in JPG format and those can in turn be recombined into a time lapse video!

The command I used was a follows:

“C:\Program Files (x86)\VideoLAN\VLC\vlc” rtsp:// -V dummy –intf=dummy –dummy-quiet –video-filter=scene –no-audio –scene-path=C:\temp –scene-format=jpeg –scene-prefix=snap-%datetime% –no-scene-replace –run-time=1 vlc://quit

I used a little batch trickery to get the filename to include the current date and time via this handy little addendum:

for /f “tokens=2 delims==” %%I in (‘wmic os get localdatetime /format:list’) do set datetime=%%I
set datetime=%datetime:~0,8%-%datetime:~8,6%

And that’s it, just run that as a scheduled task and you have periodic screen grabs!

I’ll be working on converting this to Linux later on, which should be pretty simple, but for now I’m working on a Windows machine so that’s what I have for now.

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