Does FFMPEG support user data section injection when encoding?

The MPEG and H.264 standards both define a mechanism for the injection of an arbitrary metadata stream into video frames. I've goo开发者_如何学运维gle'd a bit and am unable to determine if FFMPEG supports this. Does it?

No, it does not support this. That said, it really isn't that hard to implement this yourself and inject the metadata in to the encoded frames post encoding.