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#!/bin/sh
#
# Nagios test to detect a hanging video stream.
# Fetch two images from the Video stream and make sure they differ.
# Report error if they stay the same.
#
# Remember: apt-get install findimagedupes mplayer
delay=35 # seconds
tmpdir=/tmp
getframe() {
(
cd $tmpdir # Make sure temp file is stored in temp directory
url="$1"
filename="$2"
mplayer -ss 0:00 -frames 1 -vo jpeg -nosound $url > /dev/null 2>&1
mv 00000001.jpg $filename
)
}
for bin in mplayer findimagedupes ; do
if type $bin >/dev/null 2>&1 ; then
:
else
echo "WARNING: Unable to find $bin binary."
exit 1
fi
done
if [ ! "$1" ] ; then
cat <<EOF
Usage: check_stream_images <url>
Example: check_xstream_images http://voip.nuug.no:8000/frikanalen.ogv
EOF
exit 1
else
url="$1"
fi
timestamp=$(date +%Y%m%dT%H:%M:%S)
first="$tmpdir/first-$timestamp-$$.jpeg"
second="$tmpdir/second-$timestamp-$$.jpeg"
getframe "$url" "$first"
sleep $delay
getframe "$url" "$second"
if findimagedupes "$first" "$second" | grep -q "$second" ; then
rm $first $second
echo "CRITICAL: Two images taken $delay seconds apart were (almost) identical"
exit 2
else
rm $first $second
echo "OK: Two images taken $delay seconds apart differ"
exit 0
fi
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