[FFmpeg-devel] Uncompressed MP4

[martin schitter]

On 23.09.24 16:36, Devon Sookhoo wrote:
> I'm interested in implementing uncompressed MP4 parsing according to the
> newly released ISO/IEC 23001-17:2024. Would anyone be interested in further
> discussing this with me?

As you have most likely already seen I've worked on a rather similar 
project recently: DNxUncompressed / SMPTE RDD 50 support.

This format seems to provide very similar capabilities, but it's already 
supported by most commercial closed source high-end video production 
solutions today.

Both formats are in fact very inefficient and bandwidth wasting ways of 
storage and information exchange. Nevertheless, they are often the only 
workaround to somehow "pipe" closed source black boxes with the "free" 
world of more customizable infrastructure and computing facilities.

Right now I've just implemented a very basic CPU based decoder, which 
supports at least most of DaVinci Resolve DNxUncompressed export 
variants. It's more a side-product enabling experiments with rather 
uncommon software integration approaches.

Unfortunately I'm not an experienced ffmpeg developer, increasingly 
prefer to write code in rust over C and also enjoy the comfort of GitLab 
based CI/CD development workflows most of the time. That's why my 
contribution resp. the never-ending list of requested modifications here 
on the list feels more like a very strange adventure trip back into the 
wild jungle than efficient development work and exchange of efforts. ;)

But it was an impressive experience and a necessary first step to get 
closer to some practical insight concerning my main project. I still 
have to contemplate about desirable optimizations, which are required 
for huge uncompressed data exchange, examine more real world testing and 
profiling, and perhaps even experiment with shader based concurrent 
decoding alternatives, but this present implementation is at least a 
starting point.

It would be nice if you could tell us more about your specific interest 
in this other very similar format resp. its real world application.

Martin