Jim Ford wrote:
>
> > I would like to grab a single frame at a time of composite video to my
> > Linux PC, and would greatly welcome any advice on the best way to do
>
> For a couple of months recently I've taken snapshots at 5 min intervals of the
>interior of a bird nesting box. The hardware is a generic BT848 TV card and a cheap
>miniature B/W TV camera with infra red diodes for lighting.
> The kernel is 2.2.13 with v4l and bttv modules. I used xawtv running in an X window
>and a cron entry as follows:
> # Take a snapshot of the nest box every 5 mins. Move snapshot to
> # ~/Video/snapshot dir, after sleeping for 4 secs to allow image to be written.
> # Dump any messages.
> */5 * * * * /usr/local/bin/xawtv-remote -v 2 -d 0:0 snap jpeg win 1> /dev/null 2>
>/dev/null; sleep 4; mv ~/snap-Camera* ~/Video/snapshots
> # Make a movie out of snapshots in ~/Video/snapshots at midnight
> 59 23 * * * cd ~/Video/; /usr/local/bin/mpeg_encode default.param 1> /dev/null; cd -
>
> As you can see, as well as generating 5 min snapshots, a time-lapse movie was
>created. I found the system worked very well.
errrmm:-)
I did a program called videodog, that grab a frame and encode it to jpeg
- no need of XWindow or another lib than jpeglib.
BTW, thanks for the help guys, I got the capture loop working with
something near 30fps. Now, videodog has the two options, the single
frame capture and the loop capture.
http://planeta.terra.com.br/informatica/gleicon/videodog.html
--
Gleicon S. Moraes
http://planeta.terra.com.br/informatica/gleicon/
Writing about music is like dancing about architecture.
-- Frank Zappa
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