[FFmpeg-devel] [RFC] libavutil split out

[Tomas Härdin]

tor 2024-10-31 klockan 01:08 +0100 skrev Michael Niedermayer:
> Hi
> 
> Theres a problem with libavutil, or maybe more than one
> 
> a library implementing a codec that tries do use libavutil and itself
> is
> used by libavcodec. Creates a (build) dependancy like this
> libavutil -> libmycodec -> libavcodec
> Thats ok if libavutil is a seperate source but if libavutil and
> libavcodec
> are in the same source package and are build together

This sounds like you want to avoid having to clone the repo twice. Disk
space is cheaper than developer time

> , well iam sure
> you see this doesnt work
> build ffmpeg first, theres no libmycodec,
> build libmycodec first, theres no libavutil
> now of course this can be worked around by building ffmpeg twice
> But this is not documented, not suggested, not tested and not
> considered
> 
> of course myself spliting out libpostproc made me realize this issue.
> But
> its a much broader problem than libpostproc. For libpostproc i can
> just
> copy everything and remove all libavutil dependancies
> And even without that it builds and works fine and all but only
> because i had
> a prior build libavutil installed from before.

Are you trying to make libpostproc into a standalone library in a
separate source tree? Why? Surely the build system can be improved to
only building it and libavutil if someone wants that


/Tomas