Haw can I take snapshots from a live stream in command line?

Question

I have a security camera and I would like to take snapshots each 5-10 minutes using cron jobs, but I could fined any command line tools,

I tried the following:

avconv -i rtsp://ip:554/h264_2 -r 1 -s WxH -f image2 foo.jpeg

but the avconc doesn't support RTP/RTSP

[NULL @ 0x139d940] Interleaved RTP mode is not supported yet.Estimating duration from bitrate, this may be inaccurate

Answer 1

Note: I have absolutely no way of testing this. Mad props to "Ranger", the author of this code.

Try this:

ffmpeg -ss 2 -i rtsp://ip:554/h264_2 -y -f image2 -sameq -t 5 foo.jpeg

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Here's a simple script named, for instance, cam-capture.sh, that captures an image and names it according to the date and time.

#!/bin/sh
export DATETIME=`date +%Y%m%d%H%M`
export DATE=`date +%Y%m%d`
export MONT=`date +%Y%m`
mkdir -p /path/to/output/$MONT/$DATE

ffmpeg -ss 2 -i rtsp://ip:554/h264_2 -y -f image2 -sameq -t 5 /path/to/output/$MONT/$DATE/$DATETIME.jpeg

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Add the following entry to your crontab to execute the script every five minutes:

*/5 * * * * sh /path/to/cam-capture.sh

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Again, all credit for this goes to "Ranger" for this.