No encoder.
Code:
Codecs:
D..... = Decoding supported
.E.... = Encoding supported
..V... = Video codec
..A... = Audio codec
..S... = Subtitle codec
...I.. = Intra frame-only codec
....L. = Lossy compression
.....S = Lossless compression
-------
[...]
D.A..S pcm_bluray PCM signed 16|20|24-bit big-endian for Blu-ray media
Can't you use the "normal" PCM formats and let the authoring software deal with it? Why you need it in mkv?