API Notes: CoreMediaIO framework

The full API is described in Apple’s documentation, both the C and Objective-C APIs are available (but see the API Notes below).

These bindings are accessed through the CoreMediaIO package (that is, import CoreMediaIO).


This framework was introduced in macOS 10.7

API Notes


The APIs to create hardware plugins are not available from Python.

CMIODeviceProcessAVCCommand, CMIODeviceProcessRS422Command

The buffers in the command buffer should be bytearray instances and will be changed by the call.


The current implementation of these wrappers does not validate that the buffers are actually mutable, which may lead to surprising results when code passes an immutable buffer.