./correctTime.sh DIVE_2_1_GH010089.MP4 --update

./correctTime.sh DIVE_2_1_GH010089.corrected.MP4 
DIVE_2_1_GH010089.corrected.MP4

Video Create Time (Zulu):  2023-06-13T23:12:11.000000Z
Video Create Time (local): 2023-06-13T19:12:11 -0400 (EDT)
--------
Video Create Time (without timezone):2023-06-13T23:12:11
Video Create Time (to local):2023-06-13T23:12:11 -0400 (EDT)
--------
Video Create Time (to UTC):2023-06-14T03:12:11.000000Z

To update the metadata use --update

ffmpeg -I <MOVIE> -c copy -metadata creation_time=2023-06-13-23:12:11.000000Z <OUTPUT>

./timestamp.sh DIVE_2_1_GH010089.corrected.MP4

...
#ffmpeg -i "${INPUT}" -vf drawtext="fontsize=30:fontcolor=yellow:text='%{pts\:localtime\:${EPOCH}}':x=(w-text_w) - 10:y=(h-text_h) - 10" -vcodec libx265 -crf 28 "${OUTPUT}"

ffmpeg -i "${INPUT}" -vf drawtext="fontsize=30:fontcolor=white:text='%{pts\:localtime\:${EPOCH}}':x=(w-text_w) - 10:y=10" -crf 28 "${OUTPUT}"
...

echo file DIVE_2_1_GH010089.corrected.MP4 >  mylist.txt 
echo file DIVE_2_2_GH020089.corrected.MP4 >>  mylist.txt 

ffmpeg -f concat -i mylist.txt -c copy output.mp4

ffprobe -loglevel 0 -print_format json -show_format -show_streams "${INPUT}" | jq -r .format.tags.creation_time

#!/usr/bin/env bash

# -----------
# SPDX-License-Identifier: MIT
# Copyright (c) 2022 Troy Williams

# uuid"nb_frames": "34391",
            = 70204dea-f8b9-11ec-a408-cbfc46763958
# author"disposition": {
       = Troy Williams
# email      = troy.williams@bluebill.net
# date"default": 1,
        = 2022-06-30
# -----------

# this script will add timestamps (like security cameras) to the bottom left
# corner of the video. It will use the creation date as the starting point of
# the timestamp counter. The output video will be re-encoded to h265 format.

# NOTE: Some videos indicate they are in UTC, but in fact are not.They will need
# be correct otherwise the timestamp will be incorrect.

# NOTE: If the creation_time isn't set, the video will be skipped.

# Usage:

# $ ./timestamp.sh 20210613_191928.mp4

# loop through files in a folder:
# $ for FILE in ./2022-06-28/*; do ./timestamp.sh "${FILE}"; done
# $ for FILE in ./2022-06-28/*; do ./timestamp.sh "${FILE}" --over-write; done

# Requirements:

# JSON parser: $ sudo apt install jq

# References

# https://www.cyberciti.biz/faq/unix-linux-bsd-appleosx-bash-assign-variable-command-output/
# https://stackoverflow.com/questions/1955505/parsing-json-with-unix-tools
# https://www.baeldung.com/linux/use-command-line-arguments-in-bash-script
# https://stackoverflow.com/a/965069
# https://www.howtogeek.com/529219/how-to-parse-json-files-on-the-linux-command-line-with-jq/
# https://cameronnokes.com/blog/working-with-json-in-bash-using-jq/
# https://stackoverflow.com/questions/965053/extract-filename-and-extension-in-bash

# https://ourcodeworld.com/articles/read/1484/how-to-get-the-information-and-metadata-of-a-media-file-audio-or-video-in-json-format-with-ffprobe
# ffprobe -loglevel 0 -print_format json -show_format -show_streams GX013438.MP4

# ----------------
# Set the script to halt on errors
set -e

if [[ -z "$1" ]]; then
    echo "USAGE: $ 1./timestamp.sh video.mp4"
    exit 1
fi

# Get the movie name
# MOVIE=${1}

# What is the full path of the movie name?
INPUT=$(readlink -f "$1")

# Strip longest match of */ from start
filename="${INPUT##*/}"

# Substring from 0 thru pos of filename
dir="${INPUT:0:${#INPUT} - ${#filename}}"

# Strip shortest match of . plus at least one non-dot char from end
base="${filename%.[^.]*}"

# Substring from len of base thru end
ext="${filename:${#base} + 1}"

# If we have an extension and no base, it's really the base
if [[ -z "$base" && -n "$ext" ]]; then
    base=".$ext"
    ext=""
fi

# Create the new file name
OUTPUT="${dir}"/"${base}".stamped."${ext}"

# ----------
# Debugging Code
# echo "MOVIE = ${MOVIE}"
# echo "INPUT = ${INPUT}"
# echo "filename = ${filename}"
# echo "dir = ${dir}"
# echo "base = ${base}"
# echo "ext = ${ext}"
# echo "OUTPUT = ${OUTPUT}"
# ----------

# need to use raw mode `-r` in jq call to return a raw string otherwise it will
# be trouble to deal with
STARTDATE=$(ffprobe -loglevel 0 -print_format json -show_format -show_streams "${INPUT}" | jq -r .format.tags.creation_time)

if [[ -z "${STARTDATE}" ]]; then
    echo "ERROR - No creation_time in metadata! ${INPUT}"
    exit 1
fi

# Convert the date to EPOCH. This will be used to set the time for the draw text
# method.
EPOCH=$(date --date="${STARTDATE}" +%s)

echo "Video Create Time: ${STARTDATE} (${EPOCH})"

# we assume that the STARTDATE is in UTC 0000, Zulu time, GMT and that we want
# to convert it to the local time on the computer.
ffmpeg -i "${INPUT}" -vf drawtext="fontsize=30:fontcolor=yellow:text='%{pts\:localtime\:${EPOCH}}':x=(w-text_w) - 10:y=(h-text_h) - 10" -vcodec libx265 -crf 28 "${OUTPUT}"

if [ "${3:-"invalid"}" == "--over-write" ]; then

    echo "Moving ${OUTPUT} -> ${INPUT}"
    mv "${OUTPUT}" "${INPUT}"

else
    echo "To overwrite the existing video, use --over-write"
fi

 "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0
            },
            "tags": {
                "creation_time": "2023-07-16T15:22:49.000000Z",
                "language": "eng",
                "handler_name": "Core Media Audio"
            }
        },
        {
            "index": 1,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "High",
            "codec_type": "video",
            "codec_time_base": "1001/120000",
            "codec_tag_string": "avc1",
            "codec_tag": "0x31637661",
            "width": 1280,
            "height": 720,
            "coded_width": 1280,
            "coded_height": 720,
            "has_b_frames": 0,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "16:9",
            "pix_fmt": "yuv420p",
            "level": 32,
            "color_range": "tv",
            "color_space": "bt709",
            "color_transfer": "bt709",
            "color_primaries": "bt709",
            "chroma_location": "left",
            "field_order": "progressive",
            "refs": 1,
            "is_avc": "true",
            "nal_length_size": "4",
            "r_frame_rate": "60000/1001",
            "avg_frame_rate": "60000/1001",
            "time_base": "1/60000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 44016973,
            "duration": "733.616217",
            "bit_rate": "8069838",
            "bits_per_raw_sample": "8",
            "nb_frames": "43973",
            "disposition": {
                "default": 1,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0
            },
            "tags": {
                "creation_time": "2023-07-16T15:22:49.000000Z",
                "language": "und",
                "handler_name": "Core Media Video"
            }
        }
    ],
    "format": {
        "filename": "Dive2.mp4",
        "nb_streams": 2,
        "nb_programs": 0,
        "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
        "format_long_name": "QuickTime / MOV",
        "start_time": "0.000000",
        "duration": "733.616217",
        "size": "751679577",
        "bit_rate": "8196978",
        "probe_score": 100,
        "tags": {
            "major_brand": "mp42",
            "minor_version": "1",
            "compatible_brands": "isommp41mp42",
            "creation_time": "2023-07-16T15:22:49.000000Z"
        }
    }
}