How to extract the Photo/Video component of a MVIMG?

Question

The Google Pixel 2 and probably other phones since have the capability to cover \"Motion Photos\". These are saved as MVIMG and comparatively big.

I’m looking for a way

Answer 1

The non-perl shell scripts at the top of the post worked on my Linux system. I merged them into a single shell script that preserves the input file (like MVIMG_20191216_153039.jpg) and creates two output files (like IMG_20191216_153039.jpg and IMG_20191216_153039.mp4):

#!/bin/bash
# extract-mvimg: Extract .mp4 video and .jpg still image from a Pixel phone
# camera "motion video" file with a name like MVIMG_20191216_153039.jpg
# to make files like IMG_20191216_153039.jpg and IMG_20191216_153039.mp4
#
# Usage: extract-mvimg MVIMG*.jpg [MVIMG*.jpg...]

for srcfile
do
  case "$srcfile" in
  MVIMG_*_*.jpg) ;;
  *)
    echo "extract-mvimg: skipping '$srcfile': not an MVIMG*.jpg file?" 2>&1
    continue
    ;;
  esac

  # Get base filename: strip leading MV and trailing .jpg
  # Example: MVIMG_20191216_153039.jpg becomes IMG_20191216_153039
  basefile=${srcfile#MV}
  basefile=${basefile%.jpg}

  # Get byte offset. Example output: 2983617:ftypmp4
  offset=$(grep -F --byte-offset --only-matching --text ftypmp4 "$srcfile")
  # Strip trailing text. Example output: 2983617
  offset=${offset%:*}

  # If $offset isn't an empty string, create .mp4 file and
  # truncate a copy of input file to make .jpg file.
  if [[ $offset ]]
  then
    dd status=none "if=$srcfile" "of=${basefile}.mp4" bs=$((offset-4)) skip=1
    cp -ip "$srcfile" "${basefile}.jpg" || exit 1
    truncate -s $((offset-4)) "${basefile}.jpg"
  else
    echo "extract-mvimg: can't find ftypmp4 in $srcfile; skipping..." 2>&1
  fi
done

The status=none suppresses the "1+1 records in" and "1+1 records out" status output from dd. If your dd doesn't understand, you can remove that.