Rotate and convert videos automatically to h264 in the shell

Fri, 11 Apr 2014 21:23:07 +0000

Recently I had the luck to welcome my daughter on earth. I almost welcomed her with my smartphone in my hand recording a video. Actually I did not! But later I did a lot of videos.

I wonder how to not fill up my disk in a few weeks I had to compress them without loosing too much quality.

This is my solution:

#!/bin/bash
#set -e
set +x

size=-1

function determineMaxVideoSize(){
 local source=$1
 local width=$(exiftool $source | grep -i "^Image Width" | sed -e 's#.*: ##');
 local height=$(exiftool $source | grep -i "^Image Height" | sed -e 's#.*: ##');

 local max=$(($width>$height ? $width : $height));

 if [ $max -gt 1280 ];
 then
 size=hd720;
 else
 size=$width"x"$height;
 fi
}

function _convert(){
 local source=$1
 local target="$1.avi"
 if [ -f $target ];
 then
 echo "skipping '$source', because '$target' already exists"
 else
 # exiftool comes with libimage-exiftool-perl
 local rotation=$(exiftool $source | grep -i ^Rotation | sed -e 's#.*: ##');

 declare -A videoFilter
 videoFilter=(
 [90]='transpose=1' \
 [180]='transpose=1,transpose=1' \
 [270]='transpose=1,transpose=1,transpose=1' \
 );

 determineMaxVideoSize $source;

 local metadata=$(tempfile)
 avconv -y -i $source -f ffmetadata $metadata

 echo "rotation: $rotation"
 local videoFilter="-vf ${videoFilter[$rotation]}"
 if [ $rotation == 0 ];
 then
 videoFilter="";
 fi

 cmd="avconv -xerror -i $source \
 -acodec libmp3lame -ab 160000 `# mp3 160kB/s` \
 -vcodec libx264 -maxrate 2500k -bufsize 1000000 -r 25 -s $size $videoFilter `# 25fps, 1280x720` \
 $target.tmp.avi \
 -i $metadata -map_metadata 1 -map 0 `# add dumped metadata`"

 $cmd && \
 mv $target.tmp.avi $target && \
 touch -r "$source" "$target"
 fi
}

export -f _convert
export -f determineMaxVideoSize

find -maxdepth 1 -type f -name "*MOV" -o -name "*3gp" -o -name "*mp4" | xargs -n1 -I {} bash -c '_convert {}'

I decided to save the script as convertCamVideo2ArchivVideo.sh in ~/bin. So you can run it from everywhere as this path is already in PATH.

Multimedia on Erwähnenswert

Rotate and convert videos automatically to h264 in the shell