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ffmpeg autocrop

julian_hughes May 31st, 2012 1,544 Never
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  1. #!/bin/bash
  2. function cropdetect ()
  3. {
  4.         FFOUT=/tmp/ffout
  5.         CROP="1"
  6.         TOTAL_LOOPS="10"
  7.  
  8.         A=0
  9.         while [ "$A" -lt "$TOTAL_LOOPS" ] ; do
  10.         A="$(( $A + 1 ))"
  11.         SKIP_SECS="$(( 120 * $A ))"
  12.  
  13.         ffmpeg -ss $SKIP_SECS -i "$@" -vframes 20 -an -sn -vf \
  14.         cropdetect=30:2 -y /tmp/crop.mp4 2>$FFOUT
  15.         CROP[$A]=$(grep -m 1 crop= $FFOUT |awk -F "=" '{print $2}')
  16.  
  17.         done
  18.        
  19.  
  20.         B=0
  21.         while [ "$B" -lt "$TOTAL_LOOPS" ] ; do
  22.         B="$(( $B + 1 ))"
  23.  
  24.         C=0
  25.         while [ "$C" -lt "$TOTAL_LOOPS" ] ; do
  26.         C="$(( $C + 1 ))"
  27.  
  28.         if [ "${CROP[$B]}" == "${CROP[$C]}" ] ; then
  29.                 COUNT_CROP[$B]="$(( ${COUNT_CROP[$B]} + 1 ))"
  30.         fi
  31.         done  
  32.         done
  33.  
  34.         HIGHEST_COUNT=0
  35.  
  36.         D=0
  37.         while [ "$D" -lt "$TOTAL_LOOPS" ] ; do
  38.         D="$(( $D + 1 ))"
  39.  
  40.         if [ "${COUNT_CROP[$D]}" -gt "$HIGHEST_COUNT" ] ; then
  41.                 HIGHEST_COUNT="${COUNT_CROP[$D]}"
  42.                 GREATEST="$D"
  43.         fi
  44.         done
  45.         rm /tmp/crop.mp4
  46.         CROP="${CROP[$GREATEST]}"
  47.         CROP=$(echo $CROP|awk -F ":" '{print $1-4":"$2-4":"$3+2":"$4+2}')
  48.         echo $CROP
  49.         rm $FFOUT
  50. }
  51. cropdetect "$@"
  52. exit 0
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