On Wednesday 20 August 2003 10:03, dmitriy wrote: > Hi all!! > > Tell please, whether there is a software for detecting movement? I have > written to the list motion.sourseforge.net of dispatch and have received > the answer, that their software product processes the image with the > help only the processor. But I have a device which can digitize video > without the help of the processor. Thanks for the answer!
At one point or another, you need the uncompressed images, as there is no way to determine the difference between two compressed jpeg images. The simplest way is to get uncompressed images from the grabber, compare them and compress the ones you want to keep in software. This is how Motion does, but that leaves the compression hardware idle. A more complicated way could be to let the card grab, compress and save every frame into short files. I'm not sure whether the modern time-limit argument is in seconds or frames, but let's say it's in seconds; Make lavrec save into files that are one minute long. Combine, provided that the respective licenses permit that, code from lavplay, for reading and decoding frames, with code from Motion, for movement detection, and code from lavrec, for saving frames into a file, and have this new program throw away all equal frames and keep those that are not equal, saving them in their original, undecompressed form, into a new file. This would make the motion detection a post-processing filter that you can apply to an already captured stream. The main drawback is that it would detect movement with a minute's delay, or so. The third option would be even more complicated and possibly more unstable; build all that above right into a modified lavrec, and decompress, compare and detect in realtime. In short; no, I don't think there's any motion detector for MJPEG streams available. Be the first to create one! :) /Sam ------------------------------------------------------- This SF.net email is sponsored by: VM Ware With VMware you can run multiple operating systems on a single machine. WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines at the same time. Free trial click here:http://www.vmware.com/wl/offer/358/0 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
