I need to modify an encoder program to write .mp4 files with data for a new codec. I have not been able to find any available (i.e. usable in a commercial application) code which will handle writing .mp4 files with VBR, which does not cost too much (e.g. Bento4 at $5000.)
I would prefer not to have to code from scratch using the ISO specification.
Are you aware of any available code, C++ callable library or DLL that could handle this function for me? I have a small but reasonable budget for acquiring whatever will save me the coding and debugging time.
Thanks in advance for any help you can offer.