Hello.

I have a video file that is being questioned if it is original or edited.

Using MediaInfo, I found out that the file creation date is different from the encoding date. And there is this "com.apple.photos.originating.signature" tag.

I ran some testes using my own iPhone and it seems that the difference between the creation date and encoding date might be due to the file being shared by email. It seems the the original file was recoded in order to be sent, thus, generating the "com.apple.photos.originating.signature" tag.

Files edited on the phone and saved as new files also show this creation date and encoding date difference, but they do not have the "com.apple.photos.originating.signature" tag.

Do you have any knowledge of this that could point if my thoughts are right?

Or any other information regarding the "com.apple.photos.originating.signature" tag.

Thank you,

File info is bellow

General
Complete name : ...\IMG_2188.MOV
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt 0000.00 (qt )
File size : 721 MiB
Duration : 3 min 25 s
Overall bit rate mode : Variable
Overall bit rate : 29.4 Mb/s
Encoded date : UTC 2022-12-21 03:28:53
Tagged date : UTC 2022-12-21 03:30:13
Writing library : Apple QuickTime
com.apple.quicktime.location.accuracy.ho : 27.074246
com.apple.quicktime.location.ISO6709 : (removed due to privacy issues)
com.apple.quicktime.make : Apple
com.apple.quicktime.model : iPhone 11
com.apple.quicktime.software : 16.0
com.apple.quicktime.creationdate : 2022-12-14T23:25:18-0300
com.apple.photos.originating.signature : (28 characters string - removed due to possible privacy issues)

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 2 frames
Format settings, GOP : M=1, N=15
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 3 min 25 s
Bit rate : 27.7 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Rotation : 90°
Frame rate mode : Variable
Frame rate : 29.502 FPS
Minimum frame rate : 23.077 FPS
Maximum frame rate : 30.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.452
Stream size : 678 MiB (94%)
Title : Core Media Video
Encoded date : UTC 2022-12-21 03:28:53
Tagged date : UTC 2022-12-21 03:30:13
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 3 min 25 s
Source duration : 3 min 25 s
Bit rate mode : Variable
Bit rate : 192 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 4.66 MiB (1%)
Source stream size : 4.67 MiB (1%)
Title : Core Media Audio
Encoded date : UTC 2022-12-21 03:28:53
Tagged date : UTC 2022-12-21 03:30:13

Other #1
Type : meta
Duration : 3 min 25 s
Duration_FirstFrame : 111818
Duration_LastFrame : 92162

Other #2
Type : meta
Duration : 3 min 25 s
Bit rate mode : Variable

Other #3
Type : meta
Duration : 3 min 25 s
Bit rate mode : Variable