An opaque, pre-loaded in-memory input created by Exmpeg.load_buffer/1.

A {:memory, binary} input copies the whole binary into the Rust heap on every call, so probing then transcoding the same bytes copies them twice and an N-input concat holds N copies at once. A buffer copies the bytes once into a refcounted native resource; passing the buffer to later operations is then a refcount bump, not another copy.

Accept it anywhere an input source is expected:

{:ok, buf} = Exmpeg.load_buffer(File.read!("clip.mp4"))
{:ok, info} = Exmpeg.probe(buf)
{:ok, _} = Exmpeg.transcode(buf, "out.webm", video_codec: "libvpx-vp9")

The struct is opaque: ref holds the native resource and is not meant to be inspected. The resource (and its bytes) is freed when the buffer is garbage-collected.