ISO Base Media file (MPEG-4) — file signature 66 74 79 70 69 73 6F 6D at offset 4

For ISO Base Media file (MPEG-4), hex signature is 66 74 79 70 69 73 6F 6D; extension is mp4, verified against its source on 2026-09-22.

Hex signature: 66 74 79 70 69 73 6F 6D verified
Offset: 4 verified
Extension: mp4 verified
Format: ISO Base Media file (MPEG-4) verified

Sourceen.wikipedia.org

Verified2026-09-22

Review by2027-09-22

DatasetFile format magic numbers

What the source says

66 74 79 70 69 73 6F 6D | ftypisom | 4 | mp4 | ISO Base Media file (MPEG-4) |

— en.wikipedia.org, retrieved 2026-09-22

Source

en.wikipedia.orghttps://en.wikipedia.org/wiki/List_of_file_signatures

Last verified against source: 2026-09-22. Due for re-check by 2027-09-22. This page as Markdown · OKF bundle · full dataset as JSON.