MP4 Fast Streaming

moov position is the key for web friendly mp4, it should be ahead of mdat, the following shell checks the moov position and moves it to the right place.

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#!/bin/bash
echo $1
if [[ -z "$1" ]]; then
  echo 'directory is NULL'
  exit
fi

videos=`find $1 -type f -atime -365 | xargs -P 10 file -iN {} | grep "video/mp4" | awk -F ":" '{print $1}'`
st=$(date '+%s')
for video in $videos
do
{
  echo $video >> $st
  ffmpeg -v trace -i $video 2>&1 | grep -e type:\'mdat\' -e type:\'moov\' >> $st
  # if ffmpeg version is under 4
  # qtfaststart -l $line | grep 'mdat\|moov' >> $st
} &
wait
done

# if contain multi mdat process
v_pretask='pretask'
v_task='task'
cat $st | grep -A 1 $1 >> $v_pretask
cat pretask | grep -B 1 -e type:\'mdat\' | grep $1 >> $v_task

# move moov
prefix='NEW-'
while IFS= read -r line
do
  qt-faststart $line $prefix$line
  mv -f $prefix$line $line
  echo qtfaststart -l $line | grep 'mdat\|moov'
done < "$v_task"

exit

linenumbers=`grep -n moov $st | awk -F ':' '{print$1}'`
touch 'task.txt'
for lnumber in $linenumbers
do
  b=$(( $lnumber % 3 ))
  if [ $b = 0 ]; then
    lin=$(($lnumber - 2))
    echo `head -n $lin $st|tail -n 1` >> task.txt
  fi
done