I used to have a TV card with a video-input, and I used a command line tool to
grab video from /dev/video0, but the playback framerate and grab framerate were
able to be different. I would specify a playback rate of 25 fps (PAL) and then
a grab rate of 1 fps giving me a timelapse rate of 25x - brilliant for showing
developing storm clouds.
It was a very simple single-step process, but I cannot recall the name of the
software - it was 4 or 5 years ago I last tried this.
Currently I can record a 1fps video using mencoder or ffmpeg, but the playback
rate is also 1fps - it seems I cannot specify separate fps for playback and
capture in one-step with those softwares, so it must be another software I was
using. I'm having trouble getting dvgrab to get video from uvcvideo, trouble
building the deps for motion, and would prefer not to have to write gazillions
of images into a folder for later processing.
Thanks to those who have suggested solutions, but unfortunately the solutions
proposed are turning out more difficult than I hoped for.
Regards,
Chris W from stormy Brisbane Australia.
________________________________
From: Jeremy Figgins <u...@darkcuriosities.com>
To: linux-uvc-devel@lists.berlios.de
Sent: Wed, 23 December, 2009 1:01:21 AM
Subject: Re: [Linux-uvc-devel] Simple way to do timelapse with webcam?
It seems like Paulo answered your question, but I'm curious why you
would want this behavior? I'm setting up a similar system right now and
I wanted the intermediate frames for analysis (so that I wouldn't have
to use a framegrabber on the video file). In my case, the script creates
a video file every 60 minutes.
One thing to remember is that most video formats compress by comparing
the similarities between the current frame and nearby frames. By not
having all of the frames available at the beginning of the compression
process, you might not get the best file size.
-Jeremy
_______________________________________________
Linux-uvc-devel mailing list
Linux-uvc-devel@lists.berlios.de
https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
__________________________________________________________________________________
See what's on at the movies in your area. Find out now:
http://au.movies.yahoo.com/session-times/_______________________________________________
Linux-uvc-devel mailing list
Linux-uvc-devel@lists.berlios.de
https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
