Convert AVCHD folder containing BDMV MTS video files to MP4 with ffmpeg

avchd-mts-to-mp4.sh

#!/bin/bash -x
# Invoke with:
# ./avchd-mts-to-mp4.sh AVCHD/BDMV/STREAM/*.MTS
exifdateformat='%Y:%m:%d %T%z'
ffmpegdateformat='%FT%T'
filenamedateformat='%Y%m%d_%H%M%S'
getfileinfodateformat='%m/%d/%Y %T'
for srcfile  in "$@"
do
   exifcreatetime=$(exiftool -s -s -s -datetimeoriginal $srcfile)
   echo "Get date/time:$exifcreatetime"
   if [[ "$exifcreatetime" == "" ]]; then
       ffmpegcreatetime=$(date -j -f "$getfileinfodateformat" "$(GetFileInfo -d $srcfile)" +"$ffmpegdateformat")
     echo "ffmpeg creation time:$ffmpegcreatetime"
     filecreatetime=$(date -j -f "$getfileinfodateformat" "$(GetFileInfo -d $srcfile)" +"$filenamedateformat")
     echo "Filecreatetime: $filecreatetime"
   else
     exifcreatenodash=$(python -c "a='$exifcreatetime';print(a[:-3]+a[-2]+a[-1])")
     echo "Exifcreatenodash: $exifcreatenodash"
     ffmpegcreatetime=$(date -j -f "$exifdateformat" "$exifcreatenodash" +"$ffmpegdateformat")
     echo "transformed date/time:$ffmpegcreatetime"
     filecreatetime=$(date -j -f "$exifdateformat" "$exifcreatenodash" +"$filenamedateformat")
  fi
   echo "filename date/time:$filecreatetime"
   echo "Get value:$srcfile"
   ffmpeg -i $srcfile -c copy -metadata creation_time=${ffmpegcreatetime}Z ${filecreatetime}.mp4
done