Wishlist: UPipe block toolkit

[ncorgan]

https://github.com/Upipe/upipe

"Upipe is a flexible dataflow framework. It is primarily designed to be the
core of a multimedia player, transcoder or streamer. The framework organizes
the processing of incoming data buffer inside a pipeline of modules. It
exposes core types for buffers and modules (called "pipes"), and the API of
communication between pipes and between the application and pipes.

...

Upipe core libraries are distributed under the MIT license.
The Upipe framers library (which contains code typically used by demuxes)
is distributed under the LGPLv2.1+ license.
The Upipe filters library is distributed under the LGPLv2.1+ license.
The Upipe transport stream library is distributed under the LGPLv2.1+ license."