[Question] Support for fragmented mp4

[tvercaut]

Sorry if this is not the right place to ask but I couldn't find a forum or discussion tab for this library. I am interested in writting mp4s with frame-level metadata.

I came across your library from the pdraw documentation:
https://developer.parrot.com/docs/pdraw/video-metadata.html#integration-in-the-mp4-file

It looks like exactly what I need in terms of metadata handling and seems easier to use than ffmpeg/libavformat for this specific use case.

One of the things I would like to achieve though is to make sure that if the software crashes or the recording is interupted for any other reason before the file is properly closed, I would still be able to read a large portion of the recording. This seems to be handle through fragmentation of the mp4 and this is supported by ffmpeg/libavformat:
https://ffmpeg.org/ffmpeg-formats.html#Options-11

-movflags frag_keyframe
Start a new fragment at each video keyframe.

Can this be achieved with libmp4?