What is a Digital File?

Hex Editor Webapp Thing
https://hexed.it/

Gary Kessler’s List of File Signatures
https://www.garykessler.net/library/file_sigs_GCK_latest.html

Exploring File Formats

Laurie Speigel: Music Mouse
(press ESC to re-capture your mouse pointer!)
https://teropa.info/musicmouse/

MediaInfo Info
https://mediaarea.net/en/MediaInfo

MediaInfo Report: XDCAM-EX FILE

Format : MPEG-4
Commercial name : XDCAM EX 35
Format profile : Base Media / Version 2
Codec ID : mp42 (mp42)
File size : 5.41 MiB
Duration : 1 s 000 ms
Overall bit rate mode : Variable
Overall bit rate : 38.8 Mb/s
Frame rate : 23.976 FPS
Encoded date : 2000-00-00 00:00:00 UTC
Tagged date : 2000-00-00 00:00:00 UTC

Video ID : 1
Format : MPEG Video
Commercial name : XDCAM EX 35
Format version : Version 2
Format profile : Main@High
Format settings : CustomMatrix / BVOP
Format settings, BVOP : Yes
Format settings, Matrix : Custom
Codec ID : mp4v-61
Duration : 0 s 00 ms
Bit rate mode : Variable
Bit rate : 37.3 Mb/s
Maximum bit rate : 35.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.750
Stream size : 5.19 MiB (96%)
Language : English
Encoded date : 2000-00-00 00:00:00 UTC
Tagged date : 2000-00-00 00:00:00 UTC
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio ID : 2
Format : PCM
Format settings : Big / Signed
Codec ID : twos
Duration : 1 s 000 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 219 KiB (4%)
Language : English
Encoded date : 2000-00-00 00:00:00 UTC
Tagged date : 2000-00-00 00:00:00 UTC