Files with this 'sfmarkers' metadata...

chopomatic's icon

Hi folks,

I'm totally unfamiliar with Max and what it does, and I'm hoping you can answer a question. I'm a digital forensic examiner and I've encountered some important MP3 evidentiary files that contain the metadata shown in the attached screenshot. When I research "sfmarkers," I keep ending up here. Can anyone give me the elevator pitch of what Max is used for, and the meaning of the metadata shown below? What are sfmarkers?

Huge thanks!

Jerry

sfmarkers.png
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dhjdhjdhj's icon

Markers are like bookmarks. You can associate a name with a location in time in an audio file so it's just a way to manage a large audio file so you can get from one place to another quickly.

P.S. Max is a tool for manipulating audio, images and other data. It just so happens that there's an object available (called sfmarker~) that can retrieve the list of markers embedded in an audio file. Any decent audio editor, including the free Audacity, will have the ability to view and edit these markers. Probably some MP3 library managers can do it as well.

chopomatic's icon

Thx, DH. Okay, sounds like 'sfmarker' is as simple as a term to refer to a generic marker in an audio file. sfmarker = sound file marker? I was thinking perhaps it was a marker proprietary to the Max ecosystem.

The weird thing about these files is that no markers show up in any of the apps I've opened them in. Adobe Audition. Audacity. Izotope RX. Sound Forge.

I've downloaded and installed the trial version of Max, and also downloaded the sfmarker~ add-on. How would I use this to retrieve those markers?

Again, huge thx!

j

pdelges's icon

I did the sfmarkers~ external for Max. I choose its name according to the other objects in Max dealing with sound files: sflist~, sfplay~, sfinfo~, sfrecord~. As you noted, sf is for sound file… so this word is quite often used in different audio libraries.

My object can only retrieve markers from WAVE and AIFF files (older versions can also analyse SDII files, but it's now a deprecated format) but not MP3, sorry!

You can find informations about GEOB here.