Why the encoded date and uploaded date is different?

[Android Central Question]

I downloaded 2 videos from a social media. The first video shows the exact time when it was uploaded in the encoded date and time. But another one shows the time when the video was actually recorded in the encoded date and time.

The first video was uploaded at 9:41 UTC. The metadata...
"General
Complete name : XXXX_A5458845C9.mp4
Format : MPEG-4
Format profile : Base Media
File size : 5.58 MiB
Duration : 20 s 756 ms
Overall bit rate : 2 255 kb/s
Encoded date : UTC 2020-07-17 09:41:02
Tagged date : UTC 2020-07-17 09:41:02
com_android_version : 10

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline
Format level : 3.1
Format settings, CABAC : No
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=90
Codec ID : avc1
Duration : 20 s 756 ms
Bit rate : 1 995 kb/s
Width : 720 pixels
Height : 1 280 pixels
Display aspect ratio : 0.562
Frame rate mode : Variable
Frame rate : 29.871 FPS
Minimum frame rate : 13.451 FPS
Maximum frame rate : 39.718 FPS
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.072
Stream size : 4.94 MiB (88%)
Title : VideoHandle
Language : English
Encoded date : UTC 2020-07-17 09:41:02
Tagged date : UTC 2020-07-17 09:41:02
Color range : Limited
Color primaries : BT.601 PAL
Transfer characteristics : BT.709
transfer_characteristics_Original : BT.601
Matrix coefficients : BT.601
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec
Codec ID : mp4a-40-2
Duration : 20 s 715 ms
Duration_FirstFrame : 21 ms
Bit rate mode : Constant
Bit rate : 256 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 647 KiB (11%)
Title : SoundHandle
Language : English
Encoded date : UTC 2020-07-17 09:41:02
Tagged date : UTC 2020-07-17 09:41:02"

And the 2nd one uploaded on jun 12
""General
Complete name : XXXX_1F5185FEB8.mp4
Format : MPEG-4
Format profile : Base Media
File size : 60.3 MiB
Duration : 29 s 328 ms
Overall bit rate : 17.2 Mb/s
Encoded date : UTC 2021-03-21 23:24:47
Tagged date : UTC 2021-03-21 23:24:47
com_android_version : 10

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High
Format level : 4
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=30
Codec ID : avc1
Duration : 29 s 328 ms
Bit rate : 17.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 30.000 FPS
Minimum frame rate : 27.406 FPS
Maximum frame rate : 30.010 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.273
Stream size : 59.4 MiB (98%)
Title : VideoHandle
Language : English
Encoded date : UTC 2021-03-21 23:24:47
Tagged date : UTC 2021-03-21 23:24:47
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
Codec ID : mp4a-40-2
Duration : 29 s 291 ms
Bit rate mode : Constant
Bit rate : 256 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 915 KiB (1%)
Title : SoundHandle
Language : English
Encoded date : UTC 2021-03-21 23:24:47
Tagged date : UTC 2021-03-21 23:24:47""

After downloading, in the details option of my phone shows the downloaded time of the first video, but the 2nd video shows the time when it was recorded. My question is why there is such difference?

 

[VidJunky]

Welcome to Android Central.

Obviously you looked so it must matter to you but...?

Anyway, the meta data saved to a file can vary based on device and/or app/program used to capture the file. Some of that information is also determined by the person capturing the file as well as where it was uploaded. So if an astute person captured a video and they had created account information their name might show up as the creator vs someone just pulling a device off the shelf. They may have also gone into the settings and consented to having the creation date added or opted for other information to be included or excluded. The platform where the file is uploaded may add to the meta data. So if a file was uploaded at TMI.com it might tag it with an upload date and time essentially copyrighting it on the site. Let's say that file is downloaded and reuploaded to OMG.com, OMG doesn't care about upload dates and times so no information is updated or changed. These are reasons why two files might have different information but we know very little about your case.

Are both files from the same user?

Is this social platform that you downloaded from the original platform both files were uploaded to?

Do they drink green tea in China? Asking for a friend.

Just looking at the data you provided shows the two files have a lot of different file format information. One is baseline and the other high. One says yes to CABAC and the other no. File formatting will change the amount and types of data collected.

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[criimson]

Thank you for replying!! I was suspicious of something seeing the files so different since I don't see that in my files. I ain't no expert in this field, my apologies if I sound dumb.


This metadata mentioned below is also coming from the same user

General

Complete name :xxxx_935655F56C.mp4
Format :MPEG-4
Format profile :Base Media
File size :10.6 MiB
Duration :21 s 502 ms
Overall bit rate :4 137 kb/s
Hw :1bitRate :4194304
copyright :e55e0e94331f65da965c9a2164b4f9ffmaxrate :15000000
te_is_reencode :0
encoder :Lavf57.71.100

Video

ID :1
Format :AVC
Format/Info :Advanced Video Codec
Format profile :Baseline
Format level :3.1
Format settings, CABAC :No
Format settings, Reference frames :1 frame
Format settings, GOP :M=1, N=30
Codec ID :avc1
Duration :21 s 392 ms
Bit rate :4 021 kb/s
Width :720 pixels
Height :960 pixels
Display aspect ratio :0.750
Frame rate mode :Variable
Frame rate :30.058 FPS
Minimum frame rate :20.833
FPSMaximum frame rate :250.000
FPSStandard :NTSC
Color space :YUV
Chroma subsampling :4:2:0
Bit depth :8 bits
Scan type rogressive
Bits/(Pixel*Frame) :0.194
Stream size :10.3 MiB (97%)
Color range :Limited
Color primaries :BT.601 PAL
Transfer characteristics :BT.601
Matrix coefficients :BT.601
Codec configuration box :avcC

Audio

ID :2Format :AAC LC
Format/Info :Advanced Audio Codec
Codec ID :mp4a-40-2
Duration :21 s 502 ms
Bit rate mode :Constant
Bit rate :128 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 :336 KiB (3%)
Default :Yes
Alternate group :1

Yes those 2 files are uploaded by the same user, on the same social media platform. My suspicion is was those 2 files are coming from the same phone, along with the 3rd file I mentioned just now? Or there're shared or edited? Or the difference is just a matter of settings? And how CABAC info and format profile are responsible for this?

 

[VidJunky]

The first and third files appear to have been captured or edited by the same program based on the file naming system. The second one was captured or edited someplace else. Even the two similar ones have differences. If you look at the end of each of them it looks like settings were changed for at least the last few audio settings.

Not that your question is dumb but I do wonder why you've taken an interest in this and why it matters? The only thing I can imagine these dates might help with would be to establish copyright. At this point one can't even say that this is the first place they were uploaded and aside from the content, which is unknown to us, there's no way of saying that this is even the original creator.