#!/bin/bash

if [ -z $1 ]; then 
 echo usage: $0 time chan filename [size [minvbr [maxvbr]]]
 exit
fi

cd /media/video                 # fucking kludge to stop problems

# $1 time
# $2 chan
# $3 filename
# $4 size 400x300 by default

v4lctl setstation $2                    # change to channel
aumix -i90 -l90                         # set volume of linein

size=$4
if  [ -z "$size" ]; then
  size='400x300'
fi

minvbr=$5
if [ -z "$minvbr" ]; then
  minvbr=3
fi

maxvbr=$6
if [ -z "$maxvbr" ]; then
  maxvbr=$[ $minvbr + 5 ]               # add 5 to min
fi

vbrdiff=$[ $maxvbr - $minvbr ]

#nice --16 vcr -t $1 -p $2 -m stereo -F 30 -c 'DivX ;-) Low-Motion' $3

i=""

start=`date +%s`
end=$[ $start + ($1*60) ]
dot=""

while [ `date +%s` -lt $end ]; do
  time=$[ $end - `date +%s` ];
  echo "---------------------------------------------------------------------"
  echo "recording $3.$i for $time seconds"
  if [ -n "$i" ]; then dot="."; fi
  nice --16 ffmpeg -y -acodec mp3 -ac 2 -r 30 -t $time -s $size \
     -qmin $minvbr -qmax $maxvbr -qdiff $vbrdiff $3$dot$i
  i=$[i + 1]
  v4lctl setstation $2                    # change to channel
  sleep 1
done