Rename iOS photos/videos using file metadata

ios-exif-rename.sh

#!/bin/bash
#
# A note on timezone handling: this script uses the local timezone in which
# the photo/video was originally taken.
#
# "CreateDate" stores the local time on images, but UTC on videos.
# "CreationDate" stores the full timestamp with timezone, but is only
# available on videos.

shopt -s nullglob

# Define output file naming convention
# %%+c adds _1, _2, etc. suffix for filename conflicts
# %%e adds original file extension
# e.g: IMG_20131218_090410_1.JPG
FMT_IMG='IMG_%Y%m%d_%H%M%S%%+c.%%e'
FMT_VID='IMG_%Y%m%d_%H%M%S%%+c.%%e'

# For older versions of iOS which don't set CreationDate, you'll get
# "Warning: No writable tags set from <file>" on video files. If that
# happens, set this variable to an appropriate value like "Asia/Shanghai"
FORCE_TZ=''

for f in *.{JPG,HEIC}; do
    exiftool -q -ee -d "${FMT_IMG}" '-filename<CreateDate' "$f"
done

for f in *.MOV; do
    if [ -z "${FORCE_TZ}" ]; then
        exiftool -q -ee -d "${FMT_VID}" '-filename<CreationDate' "$f"
    else
        TZ="${FORCE_TZ}" exiftool -q -api QuickTimeUTC -ee -d "${FMT_VID}" '-filename<CreateDate' "$f"
    fi
done