MP4(3)

📦 version 2.1.0, in fedora 43, fedora 44

💖 MP4(3) — MP4 File Format Library 💖

okay bestie, so this is a page from the MP4 File Format Library manual, and today's main character is a little function called MP4ConvertFromTrackTimestamp. it's giving "time zone converter but for video tracks" and honestly? we're obsessed. ✨

🌸 NAME 🌸

MP4ConvertFromTrackTimestamp — the way it takes a timestamp from the track's own time scale and translates it into whatever time scale you ask for. like a glow-up for numbers, no cap. 💅

🎀 SYNTAX 🎀

#include <mp4.h>

u_int64_t MP4ConvertFromTrackTimestamp(
     MP4FileHandle hFile,
     MP4TrackId trackId,
     MP4Timestamp timestamp,
     u_int32_t newTimeScale
)

five ingredients, one iconic function. let's meet them 🫶

🦋 ARGUMENTS 🦋

  • hFile — the mp4 file this whole operation is happening to. like, which file are we doing surgery on, bestie.
  • trackId — which track the timestamp is coming from. gotta know the source, always. 🌈
  • timestamp — the actual timestamp that's getting converted. the star of the show, the one getting a makeover. 💖
  • newTimeScale — the brand new time scale, measured in ticks per second, that the timestamp should get converted into. new era, new units, periodt. 👑

⭐ RETURN VALUES ⭐

  • if it works? you get the timestamp back, all shiny and re-expressed in the units of the new time scale. slay. ✨
  • if something goes wrong? you get 0xFFFFFFFFFFFFFFFF. that's the error girlie. she's not subtle. 💀

🌸 DESCRIPTION 🌸

so MP4ConvertFromTrackTimestamp does the thing where it takes a timestamp — think a sample start time, for example — that lives in the track time scale, and converts it over to some other time scale you specify. 🧚

and like, why would you even want that? because a player application can use this to map all the track samples onto one common time scale. one timeline to rule them all, no more chaotic mismatched clocks. it's giving harmony. it's giving unity. it's giving "finally everything lines up." 💜

💅 SEE ALSO 💅

(the reverse direction exists too, iykyk 🔥)

and that's the whole page, bestie!! 🍓 this little masterpiece comes to you from Cisco Systems Inc., rocking Version 0.9, and honestly it ate. go convert some timestamps. you got this. 💖✨🎀🦋

📦 where this page comes from