#!/bin/sh
#
# Given a base.mpg file, generate a time-base.avi file scaled down to a
# small size with video timestamp added to the bottom right of the image.
# While doing this conversion, also convert the audio to mp3 so
# we can extract it later.
#
# The video timestamp helps when manually fixing a .keep file and the audio
# is sometimes helpful to catch commercials as well as the video.
#
mydir=`dirname $0`
PATH=`$mydir/echo-path`
export PATH
#
dt="fontsize=18"
dt="$dt:fontfile=/usr/share/fonts/dejavu/DejaVuSansMono-Bold.ttf"
dt="$dt:box=1"
dt="$dt:text="'%{pts}'
dt="$dt:x=(w-text_w-5)"
dt="$dt:y=(h-text_h-5)"
#
sc="320:-1"
#
vid="-c:v libx264 -preset ultrafast -threads 8 -crf 28"
#
aud="-acodec libmp3lame -ab 128k -ac 2"
#
infile="$1"
if [ -f "$infile" ]
then
   basefile=`basename $infile .mpg`
   ffmpeg -i "$infile" -nostats -vf "scale=$sc,drawtext=$dt" \
      $vid $aud "time-$basefile.avi" < /dev/null
else
   echo "Input file $infile does not exist." 1>&2
   exit 2
fi