MP4(3)

📦 version 2.1.0, in fedora 43, fedora 44

💖 MP4(3) — MP4 File Format Library 💖

okay bestie, so this one is from the MP4 File Format Library manual, section 3, and it's literally just one lil function that does timestamp math for you. no cap. it's giving ✨timezone conversion but for media tracks✨.

🌸 NAME 🌸

MP4ConvertToTrackTimestamp — convert a timestamp from a specified time scale over to the track time scale. yes queen, it's a unit converter but make it mp4. 💅

🎀 SYNTAX 🎀

#include <mp4.h>

MP4Timestamp MP4ConvertToTrackTimestamp(
     MP4FileHandle hFile,
     MP4TrackId trackId,
     u_int64_t timestamp,
     u_int32_t oldTimeScale
)

like look at her. four args. she's not complicated, she's just misunderstood. 🦋

🧚 ARGUMENTS 🧚

  • hFile — tells you which mp4 file we're doing this operation on. the main character, obviously. 👑
  • trackId — which track the duration came from in the first place. gotta know where the numbers originate, iykyk.
  • timestamp — the actual timestamp that's getting converted. this is the one getting a whole glow-up. ✨
  • oldTimeScale — the time scale the timestamp is currently living in, measured in ticks per second. it's the "before" pic of the transformation. 📸

⭐ RETURN VALUES ⭐

if it works: you get back the timestamp in track time scale units. slay.

if it fails: you get MP4_INVALID_TIMESTAMP. 😭 not slay. check your vibes (and your args).

💜 DESCRIPTION 💜

so basically, MP4ConvertToTrackTimestamp takes a timestamp — think a sample start time, that kind of thing — and converts it from the time scale you specify over into the track's own time scale. one time scale in, the track's time scale out. it's a translation service and honestly it ate. 🔥

🌈 SEE ALSO 🌈

(the reverse of this one, bestie — the way that they're literally mirrors 🪞)

Cisco Systems Inc. · Version 0.9 · MP4(3)

and that's the whole page fr fr 💖 ty for reading my lil manpage rant, mwah, go convert some timestamps responsibly 🫶🎀

📦 where this page comes from